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- SECTION 07533
-
- MECHANICALLY ATTACHED SINGLE-PLY ETHYLENE PROPYLENE ROOFING
- NOTE ** This section is based on products manufactured by
- Stevens Roofing Systems, a division of JPS
- Elastomerics Corp., headquartered at the following
- address:
- NOTE ** 9 Sullivan Road
- NOTE ** Holyoke, MA 01040-2800
- NOTE ** Tel: (800) 860-3491 or (413) 533-8100
- NOTE ** Fax: (413) 552-0924
- NOTE ** Website: www.stevensroofing.com
- NOTE **
- NOTE ** The Hi-Tuff/EP membrane offers the weatherability
- of an ethylene propylene membrane, plus the
- strength and reliability of hot-air-welded seams.
- The Hi-Tuff mechanically attached system can
- include metal fascia and cap flashing, clad metal
- flashing, several types of mechanical fasteners for
- insulation and membrane to suit various substrates,
- and other accessories necessary for a complete
- roofing system.
- NOTE **
- NOTE ** SECTION 07533 - MECHANICALLY ATTACHED SINGLE-PLY
- ETHYLENE PROPYLENE ROOFING, Copyright 1998, The
- Architect's Catalog, Inc.
-
- NOTE ** Stevens Roofing Systems manufactures two different
- roofing membranes: Hi-Tuff/EP and Hi-Tuff/Hypalon.
- Hi-Tuff/EP is based on a proprietary cross-linked
- polyolefin compound of ethylene and propylene
- elastomers. Hi-Tuff/Hypalon is based on DuPont's
- Hypalon, a chlorosulfonated polyethylene synthetic
- rubber (CSPE). All Hi-Tuff Roofing Systems are
- designed for both new and re-roofing applications.
- NOTE **
- NOTE ** Stevens Roofing Systems specifications for both
- membranes in the following applications are
- available: Mechanically attached, fully adhered,
- paver ballasted, stone ballasted, vented roof
- system, and Hi-Tuff Plus Total Roofing System.
-
- PART 1 GENERAL
-
- 1.1 SYSTEM DESCRIPTION
-
- A. Furnish and install mechanically attached Hi-Tuff/EP
- Roofing system in accordance with drawings and
- specifications approved by Stevens Roofing Systems.
- NOTE ** This specification is intended to be applicable to
- building roofs meeting the following criteria:
- NOTE ** - Decks of the following minimum characteristics:
- 3/4 inch plywood, 22 gage steel, normal weight
- structural concrete of 2000 psi compressive
- strength, or 1-1/2 inch wood plank.
- NOTE ** - Certain lightweight cementitious decks, subject
- to fastener pull test results.
- NOTE ** - Positive drainage in all areas.
- NOTE ** - Located in ASCE Exposure A or B zones.
- NOTE ** - No abnormally severe or unknown environmental
- exposures.
- NOTE **
- NOTE ** Consult Stevens Technical Dept. before completing
- the specification if any of the following are
- present:
- NOTE ** - ASCE Exposure C or D zones, mountain terrain,
- frequent incidence of tornadoes in area.
- NOTE ** - Chemical exposure.
- NOTE ** - Buildings with interior positive pressure at the
- deck.
- NOTE ** - Airport facilities, canopies, and buildings with
- large wall openings such as hangar doors or truck
- docks.
-
- NOTE ** Consideration should be given in the project design
- to potential safety problems that can precipitate
- from the smooth surface characteristic of the
- membrane sheet. The membrane surface becomes
- slippery when wet. If access to roof is required,
- walkway surfaces are recommended. In northern
- climates, snow sliding could create a hazard
- adjacent to the perimeter if a retarding system is
- not installed on roofs with slopes greater than 3
- inches per foot.
-
- 1.2 RELATED SECTIONS
- NOTE ** Delete any sections below not relevant to this
- project; add others as required.
-
- A. Section 03300 - Cast-In-Place Concrete.
-
- B. Section 03510 - Gypsum Concrete.
-
- C. Section 03520 - Lightweight Insulating Concrete Deck.
-
- D. Section 04200 - Unit Masonry.
-
- E. Section 05310 - Steel Roof Deck.
-
- F. Section 06100 - Rough Carpentry.
-
- G. Section 15430 - Plumbing Specialties.
-
- H. Section 16670 - Lightning Protection Systems.
-
- 1.3 REFERENCES
- NOTE ** Delete references from the list below that are not
- actually required by the text of the edited
- section.
-
- A. Approval Guide; Factory Mutual Engineering and Research.
-
- B. ASTM D 412 - Standard Test Methods for Vulcanized Rubber
- and Thermoplastic Rubbers and Thermoplastic
- Elastomers-Tension.
-
- C. ASTM D 471 - Standard Test Method for Rubber
- Property-Effect of Liquids.
-
- D. ASTM D 573 - Standard Test Method for
- Rubber-Deterioration in an Air Oven.
-
- E. ASTM D 751 - Standard Test Methods for Coated Fabrics.
-
- F. ASTM D 816 - Standard Test Methods for Rubber Cements.
-
- G. ASTM D 1149 - Standard Test Method for Rubber
- Deterioration-Surface Ozone Cracking in a Chamber.
-
- H. ASTM D 1204 - Standard Test Method for Linear Dimensional
- Changes of Non-Rigid Thermoplastic Sheeting or Film at
- Elevated Temperature.
-
- I. ASTM D 2136 - Standard Test Method for Coated Fabrics--
- Low-Temperature Bend Test.
-
- J. ASTM D 2137 - Standard Test Method for Rubber Property-
- Brittleness Point of Flexible Polymers and Coated
- Fabrics.
-
- K. Fire Resistance Directory; Underwriters Laboratories Inc.
- (UL).
-
- L. Fed. Std. 101, Method 2031 - Puncture Resistance; Part of
- Fed. Std. 101, Test Procedures for Packaging Materials.
-
- 1.4 DEFINITIONS
-
- A. American Society Civil Engineers (ASCE) Exposure Class A:
- This classification applies to large city centers with at
- least 50 percent of the buildings having a height in
- excess of 70 feet. Use of this exposure category shall
- be limited to those areas for which representative
- terrain prevails in the upwind direction for a distance
- of at least one-half mile or 10 times the height of the
- building or structure, whichever is greater. Possible
- channeling effects or increased velocity pressures due to
- the building or structure being located in the wake of
- adjacent buildings shall be taken into account.
-
- B. American Society Civil Engineers (ASCE) Exposure Class B:
- Urban and suburban areas, wooded areas, or other terrain
- with numerous closely spaced obstructions having the size
- of a single-family dwelling or larger. Use of this
- exposure category shall be limited to those areas for
- which representative terrain prevails in the upwind
- direction for a distance of at least 1,500 feet or 10
- times the height of the building or structure, whichever
- is greater.
-
- C. American Society Civil Engineers (ASCE) Exposure Class C:
- Open terrain with scattered obstructions having heights
- generally less than 30 feet. This category includes
- flat, open country and grasslands.
-
- D. American Society Civil Engineers (ASCE) Exposure Class D:
- Flat, unobstructed areas exposed to winds flowing over
- large bodies of water. This exposure shall apply only to
- those buildings and other structures exposed to the wind
- coming from over the water. Exposure D extends inland
- from the shoreline a distance of 1,500 feet or 10 times
- the height of the building or structure, whichever is
- greater.
-
- 1.5 SUBMITTALS
-
- A. Submit under provisions of Section 01300.
-
- B. Product Data:
- 1. Product data sheets for each material required,
- including:
- a. Membrane.
- b. Membrane fasteners.
- c. Insulation.
- d. Insulation fasteners.
- e. Metal accessories.
- f. Calks and sealants.
- g. Unreinforced flashing material.
- h. Preformed corners and boots.
- i. Other required materials.
- 2. Manufacturer's standard details for each applicable
- project condition.
- 3. Manufacturer's installation instructions.
-
- C. Shop Drawings: Submit roof drawing indicating which
- details will be employed in the project. Include:
- 1. Outline and size of the roof.
- 2. Membrane sheet layout.
- 3. Location and type of penetrations.
- 4. Perimeter and penetration flashing detail references.
- 5. Copy of any non-manufacturer-standard details to be
- used. Details that do not conform to manufacturer's
- standard details shall be shown as to their
- anticipated construction.
- 6. Indicate elevation changes in parapet walls, fire
- walls, adjacent roof areas, and similar roof
- geometry.
-
- D. Samples:
- 1. Membrane: 3 x 6 inch.
- 2. Fasteners: Each type required.
- 3. Insulation: 12 x 12 inch.
- 4. Metal accessories.
-
- E. Quality Control Submittals: Submit the following to the
- manufacturer, and after manufacturer's acceptance, to the
- Architect for project record.
- 1. Manufacturer's written approval of this specification
- and of any deviations from this specification or
- drawings or previously approved details. The
- manufacturer's approval does not constitute a waiver
- of the requirements of this specification or the
- drawings. Do not proceed with such deviation without
- the written approval of the Architect.
- NOTE ** Retain the 1st paragraph, below, if a warranty of
- any type is required.
- NOTE **
- NOTE ** Retain all 4 paragraphs, below, if a labor and
- material warranty is required.
- 2. Completed request for warranty, by manufacturer-
- authorized installer.
- 3. Samples and data sheets of all materials not supplied
- or approved by manufacturer.
- 4. Type and thickness of insulation.
- 5. Shop drawings specified above.
- NOTE ** Delete the following paragraph if no lightweight
- decks are present.
- 6. Pull test results on lightweight cementitious decks.
-
- 1.6 QUALITY ASSURANCE
-
- A. Installer: Roofing contractor authorized by Stevens
- Roofing Systems.
-
- B. Roof Covering:
- NOTE ** Do not include the following paragraphs unless
- actually required for the project. See UL "Roofing
- Materials and Systems Directory" and FM "Approval
- Guide" for specific listings. Delete unused
- references from References Article.
- 1. Classified by Underwriters Laboratories as a Class A
- roofing material for use in construction of Class A
- roofing assemblies.
- NOTE ** Delete at least one of the following two
- paragraphs. See FM Approval Guide for other
- mechanically attached ratings, including I-120,
- I-135, I-150, and I-195.
- 2. Meet test requirements for FM Class 1A fire and I-60
- wind resistance.
- 3. Meet test requirements for FM Class 1A fire and I-90
- wind resistance.
-
- 1.7 DELIVERY AND STORAGE
-
- A. Deliver materials with appropriate packaging labels
- indicating appropriate warnings, storage conditions, lot
- numbers, and usage instructions.
-
- B. Store materials in their original undamaged packaging.
- Maintain storage conditions in accordance with the
- manufacturer's requirements.
- NOTE ** See manufacturer's literature for specification
- requirements for other warranted systems not
- included in this specification.
- NOTE **
- NOTE ** Delete the following Article in its entirety if a
- warranty is not required. If retained, select only
- one of the available warranties.
-
- 1.8 WARRANTY
-
- A. Provide "Standard Hi-Tuff" material (membrane) only
- warranty, 5-year period.
-
- B. Provide "Standard Hi-Tuff" material (membrane) only
- warranty, 10-year period.
-
- C. Provide "Standard Hi-Tuff" material and labor warranty, 5-
- year period.
-
- D. Provide "Standard Hi-Tuff" material and labor warranty,
- 10-year period.
-
- E. Metal work other than Stevens Edge Metal Systems is not
- covered by warranty.
-
- F. Drain sleeves are not covered under Warranty.
-
-
- PART 2 PRODUCTS
-
- 2.1 MANUFACTURER
-
- A. Provide "Hi-Tuff/EP Roofing System" manufactured by
- Stevens Roofing Systems; 9 Sullivan Road, Holyoke, MA
- 01040-2800: ASD. Tel: (800) 860-3491 or (413) 533-8100;
- Fax: (413) 552-0924.
-
- 2.2 MEMBRANE MATERIAL
-
- A. Membrane:
- 1. Scrim-reinforced, thermoplastic polyolefin (TPO)-
- based sheet 76.5 inches wide by appropriate length.
- {ac}
- 2. Packaging to bear the UL label.
- 3. Thickness, nominal (ASTM D 751): 0.045 inch.
- 4. Breaking strength (ASTM D 751, Grab Method): 225
- lbf.
- 5. Elongation, ultimate (Test performed on unreinforced
- Hi-Tuff/EP membrane; ASTM D 412, Die C): 500
- percent
- 6. Tear strength (ASTM D 751, Procedure B, 8 x 8 inch
- sample): 55 lbf.
- 7. Brittleness test (ASTM D 2137, at minus 45 deg C):
- Pass.
- 8. Dimensional stability, percent change max. (ASTM D
- 1204 B: 1 hr at 212 deg F, W: 6 hrs at 176 deg F):
- Black plus/minus 0.5 percent; white plus/minus 0.3
- percent.
- 9. Factory seam strength (ASTM D 816, Method B): Sheet
- failure.
- 10. Water absorption (ASTM D 471, 158 deg F for 7 days,
- maximum percent weight change): Plus 2.0 percent.
- 11. Ozone resistance (performed on unreinforced Hi-
- Tuff/EP membrane; ASTM D 1149, 70 hrs at 100 deg F):
- Pass.
- 12. Weather resistance (Xenon arc: 4000 hrs, EMMAQUA:
- 4,000,000 Langleys): Pass.
- 13. Puncture resistance (FTM 101B, Method 2031): 250
- lbf.
- 14. Heat aging, black membrane (ASTM D 573, 28 days at
- 212 deg F): Break: 225 lbf. Elongation: 500
- percent.
- NOTE ** Delete 2 of the 3 following paragraphs.
-
- B. Color: White.
-
- C. Color: Black.
-
- D. Color: _____________.
-
- 2.3 ACCESSORY MATERIALS
-
- A. Flashing:
- 1. Same membrane as specified above except for perimeter
- use of Hi-Tuff/EP Metal for gravel stops or drip
- edges.
- 2. Field-fabricated vent stacks, pipes, drains, and
- corners: Unreinforced 0.055-inch-thick, ethylene
- propylene-based membrane.
- 3. Vent stacks, pipes, drains, and corners:
- Prefabricated pipe boots and inside and outside
- corners provided by manufacturer.
-
- B. Bonding adhesive: Hi-Tuff/EP Bonding Adhesive.
- 1. Contact cement to adhere Hi-Tuff/EP membrane and
- flashings to various substrates e.g., insulation
- surfaces, masonry surfaces, plywood, concrete, or
- metal.
- 2. It is not acceptable to use bonding adhesive in the
- seams.
-
- C. Perimeter Sheets: As specified under Part 3 of this
- Specification.
-
- D. Hi-Tuff/EP All-Purpose Sealant: To serve as a water cut-
- off mastic, pitch-box sealer, and as a caulk to seal Hi-
- Tuff/EP membrane to metal.
- 1. No other product is authorized for miscellaneous
- caulking applications that are in contact with Hi-
- Tuff/EP system components or that are intended to
- seal penetrations through the membrane system.
-
- E. Hi-Tuff/EP Seam Caulk: To seal exposed cut edges of
- reinforced membrane.
-
- F. Hi-Tuff/EP Seam Cleaner: To remove contaminants from the
- surface of the Hi-Tuff/EP membrane where hot-air welding
- is to occur.
- NOTE ** Delete insulation materials from the paragraph
- below that are not required.
- NOTE **
- NOTE ** Edit to indicate insulation thickness. Verify
- flute span on metal decks.
- NOTE **
- NOTE ** Verify that insulation complies with Stevens
- Roofing Systems requirements. See Tab 5 Chart 4 of
- the Technical Manual. Since the insulation
- requirements for thermal value will vary for each
- project, the thickness of the insulation must be
- calculated for the desired results.
-
- G. Insulation: Accepted in writing by Stevens Roofing
- Systems, and approved by their manufacturer for Hi-
- Tuff/EP mechanically attached installations.
- 1. Extruded polystyrene.
- 2. Expanded polystyrene.
- 3. Isocyanurate foam.
- 4. High density fiber board.
- 5. Thickness: ___________________.
- 6. Thickness: As indicated on the drawings.
- NOTE ** Polystyrene insulation may require an overlayment
- when installed directly under Hi-Tuff/EP black
- membrane, and may require a thermal barrier
- underlayment over steel deck. Consult manufacturer
- and local building codes. Certain insulations such
- as polystyrene are not compatible with coal tar
- pitch. Ref: Technical Manual, Tab 5, Chart 4.
- NOTE **
- NOTE ** Expanded polystyrene must have an overlayment of
- barrier board (see insulation list).
- NOTE **
- NOTE ** Delete barrier board materials from the paragraph
- below that are not required, or delete paragraph in
- its entirety in none are required.
- NOTE **
- NOTE ** Edit to indicate board thickness.
-
- H. Barrier Board (Not Warranted by Stevens Roofing Systems):
- Approved by their manufacturer for Hi-Tuff/EP
- mechanically attached installations.
- 1. Perlite.
- 2. Fiberglass faced gypsum board for roofing.
- 3. Moisture resistant gypsum sheathing.
- 4. Thickness: 1/2 inch.
- 5. Thickness: 5/8 inch.
- 6. Thickness: 3/4 inch.
-
- I. Slip Sheet: Approved by Stevens Roofing Systems; use if
- required by manufacturer.
- NOTE ** Delete the following paragraph if no tapered
- insulation is required.
-
- J. Tapered Edge Strips: High density fiber board.
-
- K. Mechanical fasteners: Shall be supplied by Stevens
- Roofing Systems.
- NOTE ** Delete the fastener applications not required. The
- first set below, for steel and concrete decks,
- apply to Factory Mutual rated systems only. The
- subsequent fasteners should not be used for FM
- systems.
- 1. Steel decks: Hi-Tuff 2-3/8-inch Barbed Metal Seam
- Plate and Hi-Tuff XHD fasteners.
- 2. Structural concrete decks: Hi-Tuff CD-10 Spikes and
- 2-3/8 inch Barbed Metal Seam Plates.
- 3. Steel and concrete decks: Hi-Tuff 2-inch diameter
- barbed plates made of 22 gage Galvalume with Hi-Tuff
- #14-10 All-Purpose screws.
- NOTE ** The following fastener applications apply only to
- non-FM rated systems.
- NOTE ** Delete fastener/deck combinations that are not
- required.
- NOTE **
- NOTE ** Lightweight cementitious decks include Elastizell
- III-B, gypsum, and tectum decks. Consult with
- manufacturer for other deck materials.
- 4. Steel and wood decks:
- 5. Steel decks:
- 6. Wood decks:
- a. Insulation: Hi-Tuff PIF Preassembled Insulation
- Fastener with 3-inch plate.
- b. Insulation: 3-inch metal plates with Hi-Tuff #14-
- 10 All-Purpose screws.
- c. Membrane: 2-inch Hi-Tuff ASAP plate and coated
- steel screw.
- d. Membrane: Hi-Tuff 2-inch diameter barbed plates
- made of 22 gage Galvalume with Hi-Tuff #14-10 All-
- Purpose screws.
- e. Membrane: Hi-Tuff 2-3/8-inch Barbed Metal Seam
- Plate and Hi-Tuff XHD fasteners.
- f. Fastener length: In accordance with
- manufacturer's recommendations (from 1-1/4 inch
- to 12 inches long).
- 7. Normal weight structural concrete decks: Hi-Tuff CD-
- 10 Spikes or Hi-Tuff All-Purpose Screws and 2 inch
- Barbed Seam Plates.
- 8. Lightweight cementitious decks:
- a. Membrane: Plastic Hi-Tuff NTB seam fasteners
- with integral 2-inch plates. Length in
- accordance with manufacturer's recommendations
- (from 3 to 8 inches in length).
- b. Insulation: NTB's with specialized or integral 3-
- inch plastic plates.
- c. Final approval of fastener type subject to pull
- tests specified in Part 3 - Execution.
- NOTE ** Delete termination bar if termination against
- parapet or other vertical surface is not required.
- NOTE **
- NOTE ** Delete metal edge if gravel stop or coping is not
- required.
- NOTE **
- NOTE ** Stevens termination bar and metal edge are the only
- approved termination systems.
-
- L. Termination Bar: Hi-Tuff Termination Bar fastened 6-
- inches o.c.
-
- M. Stevens Edge Metal Systems: Stevens Edge Metal installed
- per standard HT details.
- NOTE ** Walkways are recommended if any traffic will occur
- on roof, such as to service mechanical equipment.
- Contact the Stevens Roofing Systems Technical
- Department for specific information on roof
- walkways.
-
- N. Roof Walkways: Material and application as required by
- roofing manufacturer.
-
-
- PART 3 EXECUTION
-
- 3.1 GENERAL
-
- A. Do not deviate from this specification without written
- approval of the manufacturer.
- NOTE ** Delete the following paragraph if no warranty is
- specified.
- 1. Should deviations or changes occur without the
- manufacturer's approval, the project is not
- authorized for installation and will not be eligible
- for Warranty coverage.
-
- B. Do not deviate from this specification without written
- approval of the Architect.
-
- 3.2 EXAMINATION
-
- A. Verify that surfaces to be bonded are dry, clean and free
- of debris. Suitable surfaces are smooth, solid masonry,
- wood, and metal, plus insulation board fastened to the
- specific manufacturer's recommendations for receiving
- adhered roofing membranes and accepted by Stevens Roofing
- Systems for adhered application of Hi-Tuff/ASAP
- Fasteners.
-
- B. Verify that positive roof slope exists in all areas.
-
- C. Verify that rooftop mechanical units are to have their
- condensation lines piped to drains, or off the roof.
-
- D. Verify that rooftop grease units will have approved
- grease containment systems or a regularly scheduled
- maintenance program.
-
- E. Block off or shut down positive pressure building
- ventilation systems during application to prevent sheet
- from billowing during application.
- NOTE ** Specify requirements for respective decks in
- appropriate sections of Division 3, 4, 5 and 6.
- NOTE **
- NOTE ** Delete any of the substrates, below, that are not
- required.
- NOTE **
- NOTE ** Slip plates for plywood decks, below, are not
- mandatory, but should be considered for plywood
- decks.
-
- F. Verify that steel deck is scheduled to be covered with an
- approved insulation mechanically fastened to deck with
- Stevens Roofing Systems approved fasteners.
-
- G. Verify that wood plank decks are scheduled to be covered
- with an approved insulation mechanically fastened to deck
- with Stevens Roofing Systems approved fasteners.
-
- H. Plywood: Verify that plywood is Exterior grade with an A
- or B finish side up and with no joint gaps greater than
- 1/4 inch, and that thickness, structural grade, and
- fastening are in accordance with requirements of the
- contract documents.
- 1. Install slip plates over all gaps or uneven joints
- where membrane seams will cross to minimize welding
- inconsistency.
-
- I. Concrete: Verify that concrete is dry, fully cured, and
- prepared smooth with dust removed. The membrane shall
- have a fastened expansion joint detail (as per Standard
- HT Details) where deck joints exceed 1/4 inch or when
- crossing a building expansion joint.
-
- J. Lightweight Cementitious Decks:
- 1. Perform pull tests in accordance with the Hi-Tuff
- Pull-Test Worksheet and submit to Stevens Roofing
- Systems prior to job start for evaluation and
- establishment of a fastening pattern.
- 2. Verify that lightweight cementitious deck is
- scheduled to be covered with an approved insulation
- mechanically fastened to deck with Stevens Roofing
- Systems approved fasteners.
-
- K. Correct unsuitable conditions before proceeding with
- installation. Commencing installation signifies
- acceptance by Contractor of substrate.
-
- 3.3 SUBSTRATE PREPARATION
-
- A. Prior to the start of work, the substrate shall be smooth
- and free of debris, sharp edges, and other surface
- irregularities that will be detrimental to the
- installation. Any unevenness or joint gaps greater than
- 1/4 inch in the membrane substrate can cause inconsistent
- membrane welds and shall be avoided. When such
- conditions occur fill with appropriate and properly
- secured insulation or material approved by manufacturer's
- technical review department.
- NOTE ** The specifier must determine the condition of the
- existing roof. Significantly deteriorated decking
- must be repaired or replaced. as appropriate. Wet
- materials (containing free moisture that would
- evaporate if exposed to the atmosphere) must be
- found and replaced.
- NOTE **
- NOTE ** Edit the following paragraph to suit project
- conditions, or delete if no recovering is required.
-
- B. Reroofing over existing roof:
- 1. Make test cuts to determine existing condition and
- deck suitability. Remove noticeably damp, wet, or
- deteriorated materials.
- 2. Existing surface shall be dry, reasonably smooth and
- even, blisters cut, and loose aggregate removed prior
- to installation of approved insulation board.
- NOTE ** Vapor Retarder: Is not required for protection of
- the Hi-Tuff/EP Roofing System Membrane. As a
- guideline, the National Roofing Contractors
- Association states " ...vapor retarders should be
- considered for use when both of two conditions are
- anticipated: (1) the outside mean, average January
- temperature is below 40 deg F (4.4 deg C), and (2)
- the expected winter interior relative humidity is
- 45 percent or greater".
- NOTE **
- NOTE ** Note: In all high humidity situations consult
- Stevens Technical Review Dept. and the insulation
- manufacturer for specific application requirements.
- NOTE **
- NOTE ** If a vapor retarder is required, include
- appropriate requirements in Part 2 and 3 of the
- specification.
-
- NOTE ** Nailers are required at gravel stops and drip
- edges, but not at skylight units, curbs, and
- expansion joints, etc., except on tall buildings.
-
- C. Nailers: Verify the following.
- 1. Nailers are installed at gravel stops or drip edges.
- 2. Nailers are pressure-preservative treated (fire-
- retardant-treated where required). Creosote and
- asphaltic preservatives are not acceptable.
- 3. Nailer is anchored with a suitable fastener for the
- application having a minimum withdrawal resistance of
- 100 lbs, staggered 6 inch on center within 8 feet of
- an outside corners and 12 inches on center along
- other perimeter areas.
- 4. Nailer thickness matches the top surface of adjacent
- construction plus/minus 1/4 inch. This permissible
- variation shall not contribute to ponding.
- NOTE ** Delete or edit the following paragraph to suit
- project requirements.
-
- D. Existing Flashings: Remove and completely clean off
- wherever new Hi-Tuff Roofing System terminations and
- water stops are to be installed. Existing flashings may
- be left in place up to Hi-Tuff termination areas when in
- good structural condition and solidly attached to the
- substrate.
-
- E. Flashing Substrates: The Contractor shall be responsible
- for the suitability of the substrate surface to accept
- the membrane. The substrate shall be smooth and free of
- sharp edges and other surface irregularities that will be
- detrimental to the 100 percent adhesion of the flashing
- membrane.
-
- 3.4 FASTENERS, GENERAL
-
- A. Install fasteners with a depth-sensing screw gun to
- prevent overdriving or underdriving, unless otherwise
- approved or required by project conditions. Use the
- Olympic adapter tool for installing Hi-Tuff/ASAP
- Fasteners.
-
- 3.5 INSULATION INSTALLATION
-
- A. Handle and secure insulation boards so as to not damage
- or rupture the facer and surface. Cut out damaged areas
- and replace with structurally sound insulation, properly
- secured in place.
-
- B. Install boards with the longest dimension perpendicular
- to the direction of the membrane seams and with end
- joints staggered. Butt boards as closely as possible
- with no gaps over 1/4-inch.
-
- C. Mechanically attach boards.
- 1. Employ fastener pattern and spacing in accordance
- with approved submittals.
- 2. Provide additional fasteners as necessary to conform
- to the substrate surface geometry.
- NOTE ** Delete both of the following two paragraphs if no
- tapered insulation is required. Delete one or the
- other depending on whether tapered boards are to be
- installed under a layer of flat boards, or not.
-
- D. Tapered Insulation: Install tapered boards under a layer
- of flat insulation boards; maintain smooth transition at
- changes of slope.
-
- E. Tapered Insulation: Install tapered edge strips at
- termination of tapered insulation boards to provide a
- smooth transition to the flat areas.
-
- 3.6 MEMBRANE INSTALLATION
-
- A. Attachment of Hi-Tuff/EP Membrane: Space fasteners in
- accordance with standard HT Details and approved
- submittals.
- NOTE ** Delete the following if lightweight cementitious
- deck is not required.
- 1. Lightweight cementitious decks: Space fasteners in
- accordance with Stevens Roofing Systems requirements
- based on pull tests.
-
- B. Hi-Tuff/EP Perimeter Sheets: Install perimeter sheets
- and full-sheet in accordance with fastener pattern
- specified below, approved shop drawings. Install
- fasteners along the edge of the membrane through the
- insulation, and into the roof deck.
- NOTE ** Delete the following paragraph if none are
- required.
- 1. At perimeters that are to receive a gravel stop or
- metal edging, bring membrane over the outside edge
- and terminate 12 inches on center unless otherwise
- stated in the appropriate detail.
-
- C. Field sheets:
- 1. Unroll membrane on the area to be covered. Install
- fasteners along the leading edge of the membrane, as
- illustrated in Standard HT Details, through the
- insulation, and into the roof deck.
- NOTE ** Delete one of the following two paragraphs: the
- second is specifically for use with 2-3/8 inch
- Barbed Seam Plates and Hi-Tuff XHD fasteners - FM
- rated installation.
- 2. Adjoining rolls of membrane shall overlap the
- fastened edge of the installed membrane by 4-1/2
- inches in accordance with standard details for
- fastener location and specific deck type penetration
- requirements.
- 3. Adjoining rolls of membrane shall overlap the
- fastened edge of the installed membrane by 5-1/2
- inches in accordance with standard details for
- fastener location and specific deck type penetration
- requirements.
- 4. Cap sheets are never to be installed at a width of
- greater than 38 inches. (A cap sheet is defined as a
- sheet that is welded on both parallel seam edges
- without any mechanical fastening actually installed
- through either edge).
-
- 3.7 FASTENING PATTERNS FOR STEEL, CONCRETE, AND PLYWOOD DECK
- NOTE ** Fastening patterns below are for 22 gage steel,
- normal weight structural concrete of minimum 2000
- psi compressive strength, 3/4 inch plywood, and 1-
- 1/2 inch minimum wood plank. Contact Stevens
- Roofing Systems Technical Department if Factory
- Mutual (FM) requirements are specified.
- NOTE **
- NOTE ** Buildings that are sited on a high elevation
- relative to the surrounding area are subject to
- different fastening patterns - contact Stevens
- Roofing Systems.
- NOTE **
- NOTE ** Delete inapplicable substrates from the Article
- title above.
- NOTE ** Delete inapplicable paragraphs, below, in
- accordance with project building height.
-
- A. Buildings up to 70 feet high:
- 1. Two half-sheets, fastened 12 inches oc, parallel to
- entire perimeter ("picture frame").
- 2. Field sheets fastened 18 inches on center.
- 3. Fasten around penetrations that exceed 2 feet in
- length or diameter at 12 inches on center.
-
- B. Buildings over 70 feet to 110 feet high:
- 1. Two half-sheets, fastened 12 inches on center at
- outside edge, followed by one full-width field sheet
- fastened 9 inches oc, with all three sheets in
- "picture frame" layout.
- 2. Field sheets fastened 18 inches on center.
- 3. Fastener spacing for flashing terminations (e.g.,
- termination bars) shall not exceed 6 inches on
- center.
-
- C. Buildings over 110 feet to 200 feet high:
- 1. Two half-sheets, fastened 12 inches oc, followed by
- two full-width field sheet fastened 9 inches oc, all
- in "picture frame" layout.
- 2. Field sheets fastened 12 inches on center.
- 3. Fastener spacing for flashing terminations (e.g.,
- termination bars) shall not exceed 6 inches on
- center.
- 4. Fasten around projections over 2 feet in length or
- diameter at 9 inches on center.
-
- D. Buildings over 200 feet to 350 feet high:
- 1. Three half-sheets, fastened at 12 inches oc, followed
- by four full-width field sheet fastened 9 inches oc,
- all in "picture frame" layout.
- NOTE ** Delete inapplicable substrates, below.
- 2. Field sheets fastened to steel deck at 9 inches on
- center.
- 3. Field sheets fastened to concrete deck at 12 inches
- on center.
- 4. Field sheets fastened to plywood deck at 12 inches on
- center.
- 5. Fastener spacing for flashing terminations (e.g.,
- termination bars) shall not exceed 6 inches oc
- 6. Fasten around projections over 2 feet in length or
- diameter at 9 inches on center.
-
- E. Buildings over 350 feet high: Fasten approved insulation
- with 1 fastener per 2 square feet. Adhere membrane
- sheets to insulation. Fasten sheets as follows:
- 1. Three half-sheets, fastened at 12 inches oc, followed
- by four full-width field sheet fastened 9 inches oc,
- all in "picture frame" layout.
- NOTE ** Delete inapplicable substrates, below.
- 2. Field sheets fastened to steel deck at 9 inches on
- center.
- 3. Field sheets fastened to concrete deck at 12 inches
- on center.
- 4. Field sheets fastened to plywood deck at 12 inches on
- center.
- 5. Fastener spacing for flashing terminations (e.g.,
- termination bars) shall not exceed 6 inches on
- center.
- 6. Fasten around projections over 12 inches in length or
- diameter at 6 inches on center.
-
- 3.8 SEALING OF MEMBRANE
-
- A. Lap splice: Membrane shall be overlapped and hot-air
- welded without any contaminants (adhesive, dirt, debris,
- etc.) in the seam.
- 1. Hot-air welding: An automatic hot-air welder and
- hand-held welder which are functionally in top
- condition are a necessity for Hi-Tuff applications.
- Use hand-held welders for small work and repairs.
- Use automatic hot-air welders for field seaming.
- 2. Caulk cut edges by applying Hi-Tuff/EP Seam Caulk
- from a squeeze bottle.
- 3. Welding of Membrane After Exposure: As with any
- material after exposure, membrane will require
- cleaning prior to seaming. The approved method for
- cleaning membrane prior to hot-air welding is as
- follows:
- a. Remove any visible dirt and debris with a clean
- rag and water. For heavily contaminated
- surfaces, scrubbing with a detergent cleaner
- (e.g. Fantastik or 409) followed by a water rinse
- may be necessary.
- b. With a clean scrub pad saturated with Hi-Tuff/EP
- Seam Cleaner, aggressively agitate the seaming
- area. With a clean white rag, follow with a
- final one swipe pass over the seaming area,
- careful to not redeposit any contaminants back
- onto the cleansed sheet surface.
- c. Allow Hi-Tuff/EP Seam Cleaner to completely flash
- off (i.e. membrane should be completely dry).
- d. Follow the standard hot-air welding procedures
- with an approximate 20 percent reduction in
- speed.
- e. Final weld strength may not be achieved for
- several days.
-
- B. Flashing: Perimeters, curbs, vents, expansion joints,
- drains, and other details shall be flashed as shown in
- Standard HT Detail Drawings. Under no condition shall
- flashings cover weep holes or any form of through-wall
- drainage.
- 1. Apply Hi-Tuff/EP Bonding Adhesive to both underside
- of flashing membrane and surface to which it is to be
- bonded, at a rate of approximately one gallon per 60
- square feet of surface coverage.
- 2. Bonding adhesive shall not be applied to that portion
- of the flashing that overlaps onto itself. Hot-air
- welding shall be used throughout the system where
- membrane overlaps itself.
- 3. Hi-Tuff/EP Bonding Adhesive shall be allowed to dry
- until tacky to finger touch until it does not string
- or stick to a dry finger. Roll the flashing into the
- dry adhesive. Take care to ensure that the flashing
- does not bridge where there is any elevation or
- directional change. Roll in flashing against
- substrate to ensure 100 percent adhesion.
- 4. All flashing shall be mechanically fastened at the
- top, under or through appropriate counter flashing
- with approved fasteners and with an approved HT
- termination detail as shown in detail drawings.
- 5. Hi-Tuff/EP Metal flashing at perimeter shall be made
- and installed as per Standard HT Details.
- 6. Pipe flashings shall be installed in accordance with
- Standard HT Details. Do not flash to lead.
- NOTE ** Delete the following paragraph if re-roofing is not
- required.
- a. Remove existing flashings and sleeves.
- 7. Expansion joints shall be installed in accordance
- with Standard HT Details.
- 8. Roof drains shall be installed in accordance with
- Standard HT Details. All bolts shall be properly
- secured to supply 100 percent continuous compression
- of the clamping ring. Field seams shall not be run
- through drains.
- NOTE ** Delete the following paragraph if re-roofing is not
- required.
- NOTE **
- NOTE ** If retained, edit and coordinate with Division 15
- requirements (if any) for reuse or replacement of
- existing drains.
- NOTE **
- NOTE ** For retrofit drains, a pre-manufactured sleeve
- insert with clamping ring and backflow seal is
- recommended. See Technical Manual Tab 7.
- 9. Existing drains shall be cleaned or replaced as
- needed for clamping detail. Remove old leads and
- packings.
-
- C. Metal Work:
- 1. Metal work shall be installed in a manner that
- prevents damage from buckling or wind.
- 2. Metal work shall be sealed and waterproofed in an
- acceptable manner.
-
- D. Overnight Seal/Temporary Water Stop: Shall be made by a
- sealant method approved by Stevens Roofing Systems. To
- protect the insulation from inclement weather at the-end
- of a day's work, extend the membrane beyond the
- insulation and set into the approved overnight seal
- material. Contractor shall coordinate installation to
- ensure the system is made watertight at the end of each
- work day.
- NOTE ** If roof walkways are required, contact Stevens
- Roofing Systems Technical Department for material
- and installation requirements, and insert
- installation requirements below.
- NOTE **
- NOTE ** Show location of walkways on the drawings.
- Walkways are recommended wherever traffic will
- occur, such as from roof access point to mechanical
- units, and around mechanical units.
-
- 3.9 FIELD QUALITY CONTROL
-
- A. Ensure that metal work shall be secured in a manner
- approved by Stevens Roofing Systems, or in accordance
- with SMACNA guidelines, to prevent damage from buckling,
- or wind exposure. All metal work that is part of the
- waterproofing envelope shall be sealed, structurally
- sound, and appropriately anchored to prevent leakage.
-
- B. Tests:
- 1. Probe the entire lap edge with an approved seam
- probing tool (Sears cotter-pin extractor) after seam
- has cooled completely to verify seam consistency.
- Probing before the seam area has cooled will damage
- the membrane.
- 2. Destructive tests: 3-inch-wide area of seam weld to
- verify good peel strength. A properly welded seam
- will have membrane delamination from scrim prior to
- weld failure. Perform the following destructive
- tests on welds:
- a. First seam of each working day.
- b. First seam after the automatic hot-air welder has
- been allowed to cool down.
- c. After any extreme changes in weather conditions.
-
- C. Manufacturer's Field Service: Upon completion of the
- installation, an inspection shall be made by a
- manufacturer's representative to ascertain that the
- roofing membrane system has been installed according to
- manufacturer's approved specifications and details. Upon
- approval of the project, a warranty shall be written.
-
- D. Upon acceptance through inspection, provide specified
- warranty.
-
- E. At the discretion of Stevens Roofing Systems or the
- Architect, excessive patching as a result of damage to
- the membrane, or caused by faulty installation, may
- require total recover in those areas.
-
- 3.10 PROTECTION AND CLEANING
-
- A. Protect membrane in progress and completed membrane from
- foot and vehicular traffic.
-
- B. Clean soiled surfaces, remove trash and debris, and
- leave project site in a clean condition.
-
-
- END OF SECTION
-