General Construction Specifications
SECTION 07512
BUILT-UP COAL TAR ROOFING
PART 1 - GENERAL
1.01 SECTION INCLUDES
A. Vapor retarder placed over structural deck surface, insulation, gravel, base flashings, roofing membrane, expansion joints, and cant strips.
1.02 RELATED SECTIONS
A. Section 06114 - Wood Blocking and Curbing: Wood nailers.
B. Section 07710 - Manufactured Roof Specialties.
C. Section 07724 - Roof Hatches.
D. Section 15140 - Supports and Anchors.
1.03 REFERENCES
A. ASTM D43 - Creosote Primer Used in Roofing, Dampproofing, and Waterproofing.
B. ASTM D227 - Coal-Tar-Saturated Organic Felt Used in Roofing and Waterproofing.
C. ASTM D450 - Coal-Tar Bitumen Used in Roofing, Dampproofing and Waterproofing.
D. ASTM D1863 - Mineral Aggregate for Use on Built-Up Roofs.
E. ASTM D2626 - Asphalt Saturated and Coated Organic Felt Base Sheet Used for Roofing.
F. ASTM E96 - Water Vapor Transmission of Materials.
G. FM (Factory Mutual) - Roof Assembly Classifications.
H. NRCA (National Roofing Contractors Association) - Roofing and Waterproofing Manual.
I. UL (Underwriters Laboratories, Inc.) - Fire Hazard Classifications.
1.04 SYSTEM DESCRIPTION
A Built-up Roofing System: Four ply coal tar membrane system with vapor retarder, insulation, flashings and aggregate surfacing.
1.05 SUBMITTALS
A. Submit under provisions of Section 01300.
B. Shop Drawings: Indicate setting plan for tapered insulation, joint or termination detail conditions, conditions of interface with other materials.
C. Product Data: Provide data indicating membrane and bitumen materials, base flashing materials, insulation, vapor retarder.
D. Manufacturer's Installation Instructions: Indicate special procedures, perimeter conditions requiring special attention, and other job required data.
E. Manufacturer's Certificate: Certify that Products meet or exceed specified requirements.
1.06 QUALITY ASSURANCE
A. Perform Work in accordance with NRCA Roofing and Waterproofing Manual and manufacturer's instructions.
1.07 QUALIFICATIONS
A. Manufacturer: Company specializing in manufacturing the Products specified in this section with minimum ten years documented experience.
B. Applicator: Company specializing in performing the work of this section with minimum ten years documented experience approved by manufacturer.
1.08 REGULATORY REQUIREMENTS
A. Conform to applicable locally adopted code for roof assembly fire hazard requirements.
B. UL: Class A Fire Hazard Classification.
1.09 PRE-INSTALLATION CONFERENCE
A. Convene one week prior to commencing work of this section under provisions of Section 01039.
B. Review preparation and installation procedures and coordinating and scheduling required with related work.
1.10 DELIVERY, STORAGE, AND HANDLING
A. Deliver, store, protect and handle products to site under provisions of Section 01600.
B. Deliver products in manufacturer's original containers, dry, undamaged, with seals and labels intact.
C. Store products in weather protected environment, clear of ground and moisture.
1.11 ENVIRONMENTAL REQUIREMENTS
A. Do not apply roofing membrane during unsuitable weather when ambient temperature is below 45 degrees F or above recommended manufacturers temperature limits.
B. Do not apply roofing membrane to damp or frozen deck surface or when precipitation is occurring.
C. Do not expose materials vulnerable to water or sun damage in quantities greater than can be weatherproofed the same day.
1.12 COORDINATION
A. Coordinate work under provisions of Section 01039.
B. Coordinate the work with installation of associated counter flashings installed by other sections as the work of this section proceeds.
1.13 WARRANTY
A. Provide manufacturer's warranty under provisions of Section 01700.
B. Warranty: Cover damage to building resulting from failure to prevent penetration of water.
PART 2 - PRODUCTS
2.01 MANUFACTURERS - SHEET AND BITUMEN MATERIALS
A. Koppers Industries System 220.
B. Substitutions: Under provisions of Section 01600.
2.02 SHEET MATERIALS
A. Coal-Tar Saturated Felts: ASTM D227, No. 15.
2.03 BITUMINOUS MATERIALS
A. Coal-Tar Pitch Bitumen: ASTM D450, Type III.
B. Primer: ASTM D43.
2.04 DECK COVERING MATERIALS
A. Fire Resistant Sheet Vapor Retarder: UL requirements; reinforced asphalt/kraft paper laminate, with a vapor permeability value of 0.5 perms, including compatible fire retarder adhesive.
2.05 INSULATION
A. Manufacturers: Pittsburg Corning. Type tapered foamglas.
B. Insulation: C552, cellular glass board; with the following characteristics:
1. Board Density 8 lb/cu ft
2. Board Size 24 inch x 48 inch
3. Board Thickness Factory tapered thickness
4. Thermal Conductivity K factor of 0.31
5. Board Edges Square
C. Substitutions: Under provisions of Section 01600
2.06 FLASHINGS
A. Flexible Flashings: Neoprene; black color.
B. Manufactured Roof Specialties: As specified in Section 07710.
C. Other flashings as manufactured by Koppers Industries.
2.07 ROOF SURFACING
A. Aggregate: ASTM D1863; sound, hard washed river gravel.
B. Walkway Pads: Coal tar impregnated mineral boards with granular surfaces, as recommended by roofing membrane manufacturer.
2.08 CANTS
A. Fiber Cant and Tapered Edge Strips: Coal tar impregnated wood fiberboard, preformed to 45 degree angle.
2.09 ACCESSORIES
A. Insulation Joint Tape: Treated glass fiber reinforced; 6 inches wide; self adhering.
PART 3 - EXECUTION
3.01 EXAMINATION
A. Verify that surfaces and site conditions are ready to receive work.
B. Verify deck is supported and secure.
C. Verify deck is clean and smooth, flat, free of depressions, waves, or projections, properly sloped to drains, and suitable for installation of roof system.
D. Verify deck surfaces are dry and free of snow or ice.
E. Verify roof openings, curbs, and penetrations through roof are solidly set, and cant strips nailing strips and all other roof accessories are in place.
3.02 PREPARATION AND VAPOR RETARDER APPLICATION - CONCRETE DECK
A. Fill surface honeycomb and variations with latex filler.
B. Apply primer at a rate of 1 gal/square minimum and allow to dry.
C. Mop surface with hot bitumen and embed two plies of roof felt, full mop each ply; lap plies 19 inches; apply bitumen at a rate of 20 lb/square minimum.
D. Install flexible flashings from vapor retardant to air seal material of wall construction, lap and seal to provide continuity of the air barrier plane.
E. Glaze top surface of the vapor retarder if insulation is not placed immediately.
F. Follow manufacturer's application rates if more than specified or if the manufacturer instructs.
3.03 INSULATION APPLICATION
A. Ensure vapor retardant is clean and dry, continuous, and ready for application of roofing system.
B. Embed one layer of insulation into flood coat mopping of hot bitumen in accordance with insulation manufacturer's instructions. Lay second layer of insulation with joints staggered from first layer.
C. Place the constant thickness first layer and the tapered thickness insulation second layer to the required slope pattern in accordance with manufacturer's instructions.
3.04 MEMBRANE APPLICATION
A. Equiviscous Temperature (EVT) at Point of Application: In accordance with NRCA.
B. Apply 4 plies of roof felt weather lap edges and ends, mopped with 20 lb/square minimum of bitumen per ply. Apply felt as per manufacturer's instructions.
C. Apply felts smooth, free from air pockets, wrinkles, fishmouths, or tears.
D. Extend membrane felts up cant strips and onto vertical surfaces and under gravel stops. Mop on two additional plies of felt and one ply of granular surfaced felt as base flashings over roofing membrane plies or as per manufacturer's instructions.
E. Install two plies membrane and bitumen glaze coat for cut-off at end of day's operation. Glaze felts exposed at end of working day. Remove cut-off before resuming roofing.
F. Mop and seal two additional plies of felt around roof penetrations.
G. Install traffic pads by setting in hot coal tar at 30 lb/square. Set joints 6 inches apart.
3.05 FLASHINGS AND ACCESSORIES
A. Apply flexible base flashings to seal membrane to vertical elements.
B. Install prefabricated roofing control and expansion joints to isolate roof into areas as indicated in accordance with manufacturer's instructions.
C. Coordinate installation of roof drains and related flashings.
D. Mop in and seal flashings and flanges of items penetrating membrane with two plies of felt.
3.06 AGGREGATE SURFACING
A. Apply uniform flood coat of bitumen at rate of 70 lb/square minimum and while hot, embed a single application of roofing aggregate at rate of 400 lb/square.
3.07 FIELD QUALITY CONTROL
A. Field inspection and field laboratory testing will be performed under provisions of Section 01410.
B. Correct identified defects or irregularities.
C. Require site attendance of roofing and insulation material manufacturers during installation of the Work and require certification of material application.
3.08 CLEANING
A. Remove bituminous markings from finished surfaces.
In areas where finished surfaces are soiled by coal tar or any other source of soiling caused by work of this section, consult manufacturer of surfaces for cleaning advice and conform to their instructions.
C. Repair or replace defaced or disfigured finishes caused by work of this section.
3.09 PROTECTION OF FINISHED WORK
A. Where traffic must continue over finished roof membrane, protect surfaces.
END OF SECTION
