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- SECTION 07152
-
- LEAD MEMBRANE WATERPROOFING
- NOTE ** This section is based on products manufactured by
- members of the Lead Industries Association, Inc.,
- at the following address:
- NOTE ** 295 Madison Avenue
- NOTE ** New York, NY 10017
- NOTE ** Telephone 212-578-4750
- NOTE ** Fax 212-684-7714
- NOTE **
- NOTE ** Lead sheet for plazas, fountains, pools, and other
- below-grade applications, as well as for showers,
- commercial and institutional kitchen floors, and
- computer centers provides waterproofing of the
- highest quality. A few outstanding buildings
- featuring lead waterproofing are the World Trade
- Center, the United Nations Library, and the
- American Electric Power System's Computer Center.
- NOTE **
- NOTE ** SECTION 07152 - LEAD MEMBRANE WATERPROOFING,
- Copyright 1996, The Architect's Catalog, Inc.
-
-
- PART 1 GENERAL
-
- 1.1 SECTION INCLUDES
- NOTE ** Delete items below not required for project.
-
- A. Fountain and reflecting pool waterproofing.
-
- B. Plaza deck waterproofing.
-
- C. Planter waterproofing.
-
- D. Below-grade waterproofing.
-
- E. Kitchen floor waterproofing.
-
- F. Shower stall waterproofing.
-
- G. __________.
-
- H. Penetration flashings and perimeter flashings for lead
- waterproofing.
-
- 1.2 RELATED SECTIONS
- NOTE ** Delete any sections below not relevant to this
- project; add others as required.
-
- A. Section 02740 - Flexible Pavement.
-
- B. Section 02750 - Rigid Pavement.
-
- C. Section 02780 - Unit Pavers.
-
- D. Section 03300 - Cast-In-Place Concrete.
-
- E. Section 07600 - Flashing and Sheet Metal.
-
- F. Section 07615 - Protected Lead Membrane Roofing.
-
- 1.3 REFERENCES
- NOTE ** Delete references from the list below that are not
- actually required by the text of the edited
- section.
-
- A. ASTM B 32 - Standard Specification for Solder Metal.
-
- B. ASTM B 749 - Standard Specification for Lead and Lead
- Alloy Strip, Sheet, and Plate Products.
-
- C. ASTM D 226 - Standard Specification for Asphalt Saturated
- Organic Felt Used in Roofing and Waterproofing.
-
- D. ASTM D 4479 - Standard Specification for Asphalt Roof
- Coatings -- Asbestos Free.
-
- E. FS TT-C-494B - Coating Compound, Bituminous, Solvent
- Type, Acid Resistant.
-
- F. MIL-C-18480 - Coating Compounds, Bituminous, Solvent,
- Coal-Tar Base.
-
- 1.4 SUBMITTALS
-
- A. Submit under provisions of Section 01300.
-
- B. Product Data: Provide manufacturer's standard details
- and catalog data demonstrating compliance with referenced
- standards. Provide installation instructions.
-
- C. Samples: 6 x 6 inch samples of sheet lead.
-
- 1.5 QUALITY ASSURANCE
-
- A. Installer Qualifications: Employ only qualified
- journeymen lead burners to join sheets of lead.
-
- 1.6 DELIVERY, STORAGE, AND HANDLING
-
- A. Handle, store, and protect lead from deformation,
- construction traffic, and damage.
-
-
- PART 2 PRODUCTS
-
- 2.1 MATERIALS
-
- A. Sheet Lead:
- 1. Comply with ASTM B 749.
- NOTE ** Delete 1 of the 2 following paragraphs.
- 2. Weight: 6 psf (3/32-inch thick).
- 3. Weight: 8 psf (1/8-inch thick).
- 4. Furnish in 8 x 25 foot rolls, unless otherwise
- required or approved.
- NOTE ** Delete 1 of the 2 following paragraphs.
- NOTE **
- NOTE ** Burning (welding) is the preferred method of
- joining sheets. Soldering is more rarely used for
- smaller installations.
-
- B. Burning Rods: Same composition as sheet lead.
-
- C. Solder: ASTM B 32, 50/50 or 40/60 tin-lead.
-
- D. Underlayment: 30 lb. asphalt-impregnated felt, ASTM D
- 226, Type II.
-
- E. Slip Sheet: Reinforced plastic or paper such as "Tyvek",
- "Visquine" etc.
-
- F. Barrier Coating: Black asphaltum, FS TT-C-494, Type II;
- MIL-C-18480; or ASTM D 4479, Type II.
-
- G. Temporary Protection Board: At least one, 1/2-inch thick
- layer of suitable protective particle board or plywood.
-
-
- PART 3 EXECUTION
-
- 3.1 EXAMINATION
-
- A. Examine surfaces to receive sheet lead waterproofing.
- 1. Verify that surfaces are smooth and even, free of
- projections, protrusions, or other irregularities.
- 2. Verify that angles and edges over which lead will be
- turned are chamfered or eased.
- 3. Do not begin waterproofing operations until
- surrounding or abutting construction and penetrations
- through waterproofing are completed and approved.
- 4. Verify that concrete is sound, clean, and free of
- dirt, dust, debris, or other contaminants.
- 5. Verify that concrete surfaces have been screeded and
- floated to a smooth surface without projecting stones
- or other aggregate.
- 6. Verify that brick or other masonry substrates are
- laid true and straight, with joints struck flush or
- tooled with half-round tool.
-
- B. Notify the Architect in writing of any defective
- conditions encountered.
-
- C. Correct defective conditions before beginning
- waterproofing work. Starting of work shall constitute
- acceptance of such conditions.
-
- 3.2 SURFACE PREPARATION
-
- A. Grind down high spots.
-
- B. Fill low spots with Portland-cement-based patching
- compound approved by the Architect.
-
- C. Parge irregular substrates with acrylic-latex modified
- Portland-cement-based mortar approved by the Architect.
- NOTE ** Delete 1 of the 2 following paragraphs.
- NOTE **
- NOTE ** Free lime, which occurs in "green" cement, can
- corrode lead with disastrous consequences, and
- should not be allowed to contact lead sheet.
-
- D. Install 1 layer of underlayment over entire surface to be
- waterproofed. Install 1 layer of slip sheet over
- underlayment.
-
- E. Coat lower surface of lead to be in contact with new
- concrete slabs or other masonry surfaces with a barrier
- coating comprised of a continuous, heavy brush coat of
- black asphaltum.
-
- 3.3 INSTALLATION
-
- A. Lay out sheet to minimize joints.
-
- B. Lap joints between adjoining sheets 1-1/2 inches.
-
- C. Tools, forms, tongs, etc., shall be such as to bend and
- work lead to easy curves and to prevent scoring or
- damaging the material. Only proper lead working tools
- (wooden mallets, dressers, etc.) are acceptable to form
- the lead.
-
- D. Allow room for expansion between rigid members.
- NOTE ** Delete 1 of the 2 following articles.
- NOTE **
- NOTE ** Burning (welding) is the preferred method of
- joining sheets. Soldering is more rarely used for
- smaller installations.
-
- 3.4 BURNED JOINTS
-
- A. Clean by shave hook, lead scraper, or wire brush,
- sections of lead that are to become a part of the joint.
-
- B. Join adjacent pieces of lead sheet by burning (welding of
- lead to lead).
- 1. Use only the smallest size tip on burning torch.
- 2. Use only hydrogen and oxygen gases.
- 3. Take extreme care to avoid burning through or
- reducing the thickness of the lead sheet being
- joined.
-
- 3.5 SOLDERED JOINTS
-
- A. Clean by shave hook, lead scraper, or wire brush,
- sections of lead that are to become a part of the joint,
- including the underside of the overlapping sheet and the
- area of the bottom sheet directly under the lap and at
- least 1/4 inch beyond the edge of the lap.
- 1. Immediately after cleaning, rub a very thin coat of
- plumber's candle over shaved or brushed surfaces to
- prevent oxidation.
- 2. Sprinkle powdered rosin over shaved areas.
-
- B. After solder-tacking sheets together at suitable
- intervals, feed solder to joints using a clean, well
- tinned soldering iron at the proper temperature. Fully
- solder the joint surfaces including the underside of the
- overlapping sheet and the area of the bottom sheet
- directly under the lap.
-
- 3.6 PROTECTION
- NOTE ** Delete the following paragraph if cementitious
- toppings will not be installed in contact with lead
- sheet.
-
- A. Cementitious Toppings: Where upper surface of lead sheet
- will be exposed to cementitious toppings or setting beds,
- apply a continuous, heavy brush coat of black asphaltum
- to entire surface of lead sheet.
- NOTE ** Depending on project conditions -- whether pool or
- planter, whether tile or concrete slabs or earth
- fill are to be installed -- the project design may
- require a sandwich of various materials between the
- lead sheet and the final surfacing exposed to view.
- These materials might include permanent insulation,
- layers of gravel fill or planting soils, tile
- setting beds, concrete slabs, tough protection
- boards to guard against specific types of damage,
- or any combination of such materials.
- NOTE **
- NOTE ** Many of these materials would be specified in the
- respective finish sections of the specifications;
- some could be specified here (and materials added
- in Part 2). The following is considered to be a
- minimum acceptable level of protection.
-
- B. Protect material and work in place from damage. Repair
- any damage that may occur.
-
- C. Provide temporary water cut-offs to prevent penetration
- of water underneath the membrane when work is
- interrupted, at end of day, or during inclement weather.
- Remove and discard temporary cut-offs before proceeding.
-
- D. Temporary Protection: Do not permit construction traffic
- directly on top of lead sheet. Install suitable
- protection board as installation proceeds to guard
- against occasional, essential light traffic and against
- excessive temperature changes until permanent covering
- has been installed.
-
-
- END OF SECTION
-