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- SECTION 07325
-
- CERAMIC SLATE ROOFING
- NOTE ** Celadon(tm) ceramic slate roofing system.
- NOTE **
- NOTE ** This section is based on Celadon(tm) Ceramic
- Slate(tm), a unique roofing system that simulates
- the appearance of heavy, natural slate roofing in
- an interlocking ceramic roof tile.
- NOTE **
- NOTE ** Celadon Ceramic Slate is applied on sloped roofs
- where appearance, longevity, and durability are
- prime considerations. The ceramic slates are
- molded from six compatible slate textures and are
- available in five natural slate colors. The
- product is virtually impervious to moisture, heat
- and fire, and it easily withstands repeated freeze-
- thaw cycles.
-
- NOTE ** For additional information and literature, contact
- Celadon as follows:
- NOTE ** Architectural Support Group
- NOTE ** P.O. Box 860
- NOTE ** Valley Forge PA 19482
- NOTE ** Tel. (800) 699-9988
- NOTE ** Fax. (610) 341-7940
- NOTE **
- NOTE ** SECTION 07325 - CERAMIC SLATE ROOFING, Copyright
- 1998, The Architect's Catalog, Inc.
-
- NOTE ** Alpine Conditions: Celadon requires specific
- measures besides those included in this
- specification when ceramic slate is to be used in
- alpine conditions. Climatic conditions of frequent
- heavy snowfalls alternating with strong solar
- radiation, as is common in high altitudes, are
- classified as alpine conditions. Snow guards are
- recommended to prevent sudden snow movement on the
- roof. Before use of ceramic slate in alpine
- conditions, plans must be submitted to the Ludowici
- Technical Department at (800) 945-8453 for
- approval.
- PART 1 GENERAL
-
- 1.1 SECTION INCLUDES
- NOTE ** Delete items below not required for project.
-
- A. Kiln-fired clay roofing slate.
-
- B. Moisture shedding underlayment, eave, valley, and ridge
- protection.
-
- C. Metal roof flashing.
-
- D. Roofing cant strips and hip and ridge nailing strips.
-
- E. Fasteners.
-
- 1.2 RELATED SECTIONS
- NOTE ** Delete any sections below not relevant to this
- project; add others as required.
-
- A. Section 06100 - Rough Carpentry: Framing and Sheathing.
-
- B. Section 06114 - Wood Blocking and Curbing.
-
- C. Section 06150 - Wood Decking.
-
- D. Section 07600 - Flashing and Sheet Metal.
-
- E. Section 07710 - Manufactured Roof Specialties: Snow
- guards.
-
- F. Section 08620 - Unit Skylights.
-
- 1.3 REFERENCES
- NOTE ** Delete references from the list below that are not
- actually required by the text of the edited
- section.
-
- A. ASTM A 167 - Standard Specification for Stainless and
- Heat-Resisting Chromium-Nickel Steel Plate, Sheet, and
- Strip.
-
- B. ASTM B 370 - Standard Specification for Copper Sheet and
- Strip for Building Construction.
-
- C. ASTM B 749 - Standard Specification for Lead and Lead
- Alloy Strip, Sheet, and Plate Products.
-
- D. ASTM C 920 - Standard Specification for Elastomeric Joint
- Sealants.
-
- E. ASTM C 1167 - Standard Specification for Clay Roof Tiles.
-
- F. ASTM D 226 - Standard Specification for Asphalt-Saturated
- Organic Felt Used in Roofing and Waterproofing.
-
- G. ASTM D 1970 - Standard Specification for Self-Adhering
- Polymer Modified Bituminous Sheet Materials Used as Steep
- Roofing Underlayment for Ice Dam Protection.
-
- H. ASTM D 2626 - Standard Specification for Asphalt-
- Saturated and Coated Organic Felt Base Sheet Used in
- Roofing.
-
- 1.4 SUBMITTALS
-
- A. Submit under provisions of Section 01300.
-
- B. Product Data: Provide manufacturer's printed information
- on material characteristics, performance testing, and
- application limitations.
-
- C. Installation Instructions: Include manufacturer's
- requirements for substrate preparation and installation
- of roofing system and related accessories.
-
- D. Shop Drawings: Indicate specially configured metal
- flashing, jointing methods and locations for flashing,
- and typical roofing system details.
-
- E. Selection Samples: Provide pieces of actual ceramic
- slate, illustrating complete range of colors available,
- for Architect's selection.
-
- 1.5 QUALITY ASSURANCE
-
- A. Manufacturer's Data: Perform work in accordance with
- manufacturer's installation instructions. Maintain one
- copy of document at project site.
-
- B. Installer Qualifications: Company specializing in
- installing roofing of the type specified in this section,
- with not fewer than three years of documented experience.
-
- 1.6 DELIVERY, STORAGE, AND HANDLING
-
- A. Deliver products to project site in manufacturer's
- unopened cartons, labeled with data indicating compliance
- with specified requirements.
-
- 1.7 WARRANTY
-
- A. See Section 01780 - Closeout Submittals, for additional
- warranty requirements.
-
- B. Provide manufacturer's 60-year limited transferable
- warranty against defective materials.
- 1. Supplement: Provide supplemental "FirstFifteen
- Protection" warranty to cover labor and materials in
- the event of a material defect during the first
- fifteen years after completion of ceramic slate
- application.
- 2. Transferability Clause: Include clause in warranty
- giving Owner the right to transfer the warranty to a
- subsequent owner.
-
- 1.8 EXTRA MATERIALS
-
- A. Provide an additional 3 percent of installed roofing
- slates, but not less than one full carton, for Owner's
- use in roof maintenance.
-
-
- PART 2 PRODUCTS
-
- 2.1 MANUFACTURER
-
- A. Provide Celadon Ceramic Slate, as manufactured by
- Celadon; P.O. Box 309; New Lexington, OH 43764. For
- additional information, contact Celadon's Architectural
- Support Group; P.O. Box 860, Valley Forge PA 19482; ASD.
- Tel. (800) 699-9988, Fax. (610) 341-7940.
-
- B. Substitutions will not be acceptable.
-
- 2.2 CERAMIC ROOFING SLATES
-
- A. Provide roofing slates with the following properties:
- 1. Basic Properties: Comply with ASTM C 1167, Grade 1.
- 2. Weight: 580 pounds per square (28.3 kg/sq m), for
- normal 13-1/4 inch (336 mm) exposure.
- 3. Weight: 589 pounds per square (28.8 kg/sq m), for
- low slope 13 inch (330 mm) exposure.
- 4. Thickness: Nominal 3/4 inch (19 mm), ribbed design.
- 5. Moisture Absorption: Maximum of 1.0 percent.
- 6. Minimum Cross Breaking Strength: 300 pounds.
- NOTE ** Select one of the color options listed below, or
- edit to describe a designed blend of mixed colors.
- Delete colors not required for project.
- 7. Color: Slate Gray.
- 8. Color: Montpelier Green.
- 9. Color: Brunswick Black.
- 10. Color: Slate Red.
- 11. Color: Plumstone.
- 12. Color: As selected by Architect from manufacturer's
- standard colors.
- 13. Color Blend:
- a. Slate Gray: ___ percent.
- b. Montpelier Green: ___ percent.
- c. Brunswick Black: ___ percent.
- d. Slate Red: ___ percent.
- e. Plumstone: ___ percent.
-
- B. Accessory Slate Shapes: Provide the following accessory
- shapes, in color matching field slates, for areas shown
- on the drawings:
- 1. Custom ridge cap.
- 2. Custom hip cap.
- 3. Rake edge.
- 4. Detached gable rake.
- 5. Half slate.
-
- 2.3 SHEET MATERIALS
- NOTE ** Select one of the following three underlayments if
- roof slope is over 4 inches per foot; retain
- WinterGuard for use at valleys, hips, and ridges.
- NOTE **
- NOTE ** For low slope roofs between 3 inches per foot and 4
- inches per foot, WinterGuard or its equivalent must
- be used as an underlayment.
- NOTE **
- NOTE ** Celadon Ceramic Slate should not be installed on
- roofs sloped less than 3 inches per foot.
-
- A. Underlayment: ASTM D 1970, self-adhering rubberized
- asphalt membrane with high traction surface, internal
- reinforcement, and "split" back plastic release film.
- 1. Provide CertainTeed "WinterGuard" sheet barrier
- waterproofing shingle underlayment.
-
- B. Underlayment: ASTM D 2626; one layer of No. 40 coated
- base sheet.
-
- C. Underlayment: ASTM D 226; two layers of No. 30 asphalt
- impregnated roofing felt.
- NOTE ** Select one of the following flashing materials and
- delete the others, unless you intend to leave all
- types for Contractor's selection.
-
- D. Flashing: Terne coated stainless steel; 0.015 inch (0.38
- mm) thick stainless steel core material complying with
- ASTM A 167, Type 304; coated with 0.092 lb/sq ft (450
- g/sq m) terne alloy on both sides of core metal.
-
- E. Flashing: ASTM B 370 copper, cold rolled, 16 oz/sq ft
- (0.56 mm thick), natural finish.
-
- F. Flashing: Lead sheet, 2.5 lb/sq ft (1 mm thick);
- complying with ASTM B 749.
-
- 2.4 ACCESSORIES
-
- A. Screws: No. 8 or No. 9 brass or stainless steel,
- flathead Phillips or square drive, not less than 1-3/4
- inches (45 mm) long.
-
- B. Nails for Solid Wood Deck: Corrosion resistant copper,
- brass, or stainless steel; minimum 3/8 inch (9.5 mm)
- head diameter; shank of minimum 11 gage (3 mm) diameter
- and length sufficient to penetrate 3/4 inch (19 mm) into
- deck but not through the underside.
-
- C. Nails for Plywood Sheathing: Slater's copper ring shank
- nail, 11 gage (3 mm), not less than 1-3/4 inches (45 mm)
- long with 3/8 inch (9.5 mm) head; point must penetrate
- through underside of deck.
-
- D. Wood Nailers and Cant Strips: Preservative-treated wood,
- as specified in Section 06114.
-
- E. Adhesive: OSI Pro-Series RT-600 Roof Tile Adhesive.
- 1. Do not expose to ultraviolet rays.
- 2. Do not allow direct contact with waterproofing
- shingle underlayment.
-
- F. Sealant: ASTM C 920 silicone, low modulus. Provide one
- of the following:
- 1. Dow Corning 790 Silicone Building Sealant.
- 2. GE SilProof.
- NOTE ** Delete the following paragraph if not required.
- Copper wire is used to fasten ceramic slates at
- valleys.
-
- G. Copper Wire: 18 gage (1.2 mm) minimum.
- NOTE ** Snow guards in the following paragraph are
- recommended in alpine conditions to prevent snow
- movement. Alpine conditions are defined as
- climatic areas that experience frequent heavy
- winter snowfall intermittent with strong solar
- radiation common to high altitude geography.
-
- H. Snow Guards.
-
- 2.5 FLASHING FABRICATION
-
- A. Form flashing to profiles indicated on drawings and as
- required to protect roofing materials from physical
- damage and shed water.
-
- B. Form sections square and accurate in profile, in maximum
- possible lengths, free from distortion or defects
- detrimental to appearance or performance.
-
-
- PART 3 EXECUTION
-
- 3.1 EXAMINATION
-
- A. Comply with provisions of Section 01700.
-
- B. Verify that roofing penetrations and plumbing stacks are
- in place and properly flashed to deck surface.
-
- C. Verify that roof openings are correctly framed.
-
- D. Verify that deck surfaces are dry and free of ridges,
- warps, and voids.
-
- 3.2 PREPARATION
- NOTE ** Celadon requires a minimum deck of 15/32 inch (13
- mm) APA approved plywood roof decking or 1-inch (25
- mm) nominal thickness, well seasoned tongue-and
- groove wood sheathing boards. A 3/4 inch (13 mm)
- thick APA approved plywood deck is recommended, but
- not required, for superior nail and screw
- fastening.
- NOTE **
- NOTE ** If sheathing boards are used, they must not be over
- 6 inches (152 mm) in width and must be fastened to
- each rafter with not less than two 8d nails.
-
- A. Comply with ceramic slate manufacturer's recommendations
- on preparation of acceptable roof deck.
-
- B. Broom clean deck surfaces prior to installation of
- underlayment.
-
- 3.3 UNDERLAYMENT INSTALLATION
- NOTE ** On roofs sloped at least 4 inches per foot (ratio
- 4:12), install any of the three underlayment types.
- On slopes between 3 inches per foot (ratio 3:12)
- and 4 inches per foot (ratio 4:12), install
- CertainTeed WinterGuard or its equivalent over the
- entire deck surface.
- NOTE **
- NOTE ** Celadon Ceramic Slate may not be applied on roofs
- sloped less than 3 inches per foot (ratio 3:12).
-
- A. Install underlayment over entire deck surface, in
- accordance with instructions of ceramic slate
- manufacturer. At hips, valleys, and ridges, install 36
- inch ( 915 mm) width of WinterGuard underlayment or
- equivalent, centered on the valley or ridge.
- 1. Under cold installation conditions, tack WinterGuard
- in place if it does not immediately adhere to deck.
-
- B. Ice Dam Protection: Apply WinterGuard underlayment or
- equivalent at eaves that are subject to icing and back-up
- of water. Apply from roof edge to a line that when
- projected to the horizontal is not less than 24 inches
- (610 mm) inside of interior wall line.
- 1. On overhanging eaves that require more than a single
- 36-inch (915 mm) width of WinterGuard, overlap not
- less than 6 inches (152 mm), assuring that overlapped
- area is located on overhang, outside wall line.
-
- 3.4 FLASHING INSTALLATION
-
- A. Install flashing at all locations where roof intersects
- other roofs, sidewall or parapet walls, chimneys,
- ventilators, and similar projections, and at gable edges.
- NOTE ** Select open or closed valley construction, or
- delete both if roof has no valleys. Do not use
- open valleys in alpine conditions, because there
- are exposed edges for ice to grip -- use closed
- valleys instead.
-
- B. Open Valley: Install minimum 20 inch ( 510 mm) wide open
- valley metal flashing over 36-inch (915 mm) wide
- WinterGuard, with field underlayment lapped over edges of
- flashing not less than 4 inches (100 mm) . Fasten metal
- with cleats. Overlap metal a minimum of 5 inches (130
- mm).
-
- C. Closed Valley: Install closed valley metal flashing over
- 36-inch (915 mm) wide WinterGuard by interleaving ceramic
- slates with minimum 20-inch (510 mm) wide prepared metal
- flashing sheets. Attach ceramic slates using copper
- wires to copper straps nailed beyond the top edge of the
- metal flashing.
-
- 3.5 WOOD NAILER AND CANT STRIP INSTALLATION
-
- A. Cant Strip: Install nominal 1 inch by 2 inches by 48
- inches (25 mm by 50 mm by 1220 mm) wood cant strips at
- eaves. Apply eave flashing and underlayment over cant
- strip.
-
- B. Cant Strip: Install nominal 1 inch by 2 inches by 48
- inches (25 mm by 50 mm by 1220 mm) pressure-treated wood
- cant strips directly over underlayment at eaves, spacing
- 1 inch (25 mm) apart for drainage.
-
- C. Nailers: Install nominal 1 inch by 2 inches by 48 inches
- (25 mm by 50 mm by 1220 mm) pressure-treated wood nailers
- as detailed at ridge and hips, directly over
- underlayment. Protect with additional layer of
- WinterGuard before installing hip and ridge accessory.
-
- 3.6 CERAMIC SLATE INSTALLATION
-
- A. Install ceramic slate roofing in strict conformance with
- manufacturer's instructions.
- NOTE ** Overhang of Celadon Ceramic Slate at eaves should
- be not less than 3/4 inch (19 mm) and not more than
- 2 inches (51 mm). This dimension should be related
- to the size of gutters and should either be shown
- on the drawings or specified here.
-
- B. Install first course over cant strip, with overhang.
- 1. Do not drive fasteners tightly against ceramic
- slates, to reduce risk of breakage and to allow
- natural deck movement.
- 2. Allow ceramic slate to "hang" on its fasteners.
- NOTE ** Delete one of the two subparagraphs below. The
- first is for normal conditions, the second for
- alpine conditions.
- 3. Provide 3/4 inch (19 mm) to 2 inches (51 mm)
- overhang, permitting proper flow into gutters.
- 4. Provide not more than 1/2 inch (13 mm) overhang,
- unless gutters are in place. If gutters are used,
- provide just enough overhang to permit proper flow
- into gutters; provide under-eave slate course or
- heavy-gage drip edge with extended hemmed lip to
- reinforce strength of overhang.
-
- C. Install each subsequent course with joints centered on
- ceramic slates below, with maximum exposure in each
- course of 13-1/4 inches (336 mm). Wet cut slates at hips
- and valleys, using masonry saw with diamond blade.
-
- D. At hip and ridge, and on mansard roofs, install bead of
- adhesive at butt end of each slate, located so it is
- completely concealed. Install sealant as required at hip
- and ridge accessories to achieve watertight installation.
- NOTE ** Include the following paragraph for alpine
- conditions.
-
- E. Install snow guards where shown and otherwise required by
- Code.
-
- 3.7 FIELD QUALITY CONTROL
-
- A. Comply with Section 01400 for field inspection.
-
- B. Inspection will involve surveillance of roofing work
- during installation to ascertain compliance with
- specified requirements.
-
- 3.8 PROTECTION
-
- A. Comply with Section 01700.
-
- B. Minimize traffic over finished roof surface. If
- necessary, wear soft-soled shoes and walk on the "butt"
- of the tile in order to avoid breakage.
-
-
- END OF SECTION
-