"Square" means a standard roofing measurement equal to 100 sq. ft. or 10 ft.-0" x 10 ft.-0".

Transcription

1 016/09/13 1/1 1.0 PURPOSE This specification describes the minimum requirements for roofing on concrete and metal decks for flat roofs and for roofs with slopes less than or equal to 3 in 1. This specification supplements the requirements of the Occupational Health and Safety Act and Regulations and the Building Code and Regulations. The following drawings form part of this specification: B Concrete Roof Decks - Eave and Cant Details B Metal Roof Decks - Eave and Cant Details B Roof Openings, Curbs and Column Flashing.0 DEFINITIONS "Square" means a standard roofing measurement equal to 100 sq. ft. or 10 ft.-0" x 10 ft.-0". 3.0 JOB CONDITIONS 3.1 QUALITY ASSURANCE Qualification: Perform work by a company that has a minimum of 5 years proven acceptable roofing experience on installations of similar complexity and scope. Contractor to be recognized by the roofing manufacturer to install their products. Workmanship: Perform roofing work in accordance with the CRCA Roofing Specifications Manual and in accordance with membrane manufacturer s printed installation instructions. Comply with ULC Class A roof. 3. ENVIRONMENTAL CONDITIONS Do not apply roofing materials during rain, cold weather, fog, snow or over damp or unsuitable surfaces. Apply roofing within suitable temperature range only. 3.3 PROTECTION At hoisting locations, cover vertical surfaces with tarpaulins. The use of open flame (torching) is NOT ACCEPTABLE unless permitted by Vale Engineering. If permitted, ensure torching is performed by skilled workers who have successfully completed a course of instruction by membrane manufacturer in torch-applied membrane techniques. Ensure that a 0 lb. dry chemical fire extinguisher, fully charged and in operable condition, is available at all times at locations where open flames are in use.

2 016/09/13 /1 Locate kettles at grade level and minimum 5 feet from any building. 3.4 CLEANING Remove asphalt from metal flashings and surrounding surfaces. Clean metal flashings according to metal manufacturer's directions. 3.5 DELIVERY, STORAGE AND HANDLING Store membrane rolls on end with selvage edges up and protected from moisture. Slit packaging to allow for proper ventilation of any latent moisture. Keep insulation and roofing membranes absolutely dry. Remove only as much from storage as can be applied, made weather tight, and covered with roofing in the same day. Materials found to be damp at time of installation or showing evidence of having been damp or exposed to moisture, will be rejected and removed from site. Store roofing membranes for 4 hours minimum in area kept at minimum 10oC and remove for application with minimum exposure to low temperatures. Keep membranes dry, stored off the ground, on end and well ventilated. Cover walls and adjacent work where materials are hoisted or used with protective tarpaulins. Clean off drips and smears of bituminous material immediately. Protect completed portions of roofs from damage due to traffic and materials handling until completion of work. At end of each day s work or when stoppage occurs due to inclement weather, protect completed work and materials. 4.0 BUILT-UP 4.1 MATERIALS In general the roofing system shall comply with ULC Class A roofing and shall consist of: Roof structural deck (part of building structure). Vapour barrier Polyisocyanurate insulation Fiberboard ply modified Bitumen membrane (mopped) Flood coat Pea gravel surfacing ply modified Bitumen flashing system.

3 016/09/13 3/ Asphalt Primer In accordance with CGSB 37-GP-9Ma Acceptable products: IKO asphalt primer by IKO or approved equal Asphalt (Hot Bitumen) In accordance with CSA A Type II for slopes flat to 1 1/ inches in 1. Type III for slopes over 1 1/ inch in 1 to 3 inches in 1. Acceptable product by IKO or approved equal Deck Joint Filler Seal joints and deck surface imperfections over 1/4 inch with cement grout. Seal joints less than 1/4 inch with plastic cement, and strips of felt paper Vapour Barrier Shall be UL listed and conforms to factory mutual Class 1. The following vapour barrier systems are acceptable to use with metal roof deck: Armourgard Vapour Retardant by IKO or equal. The following vapour barrier systems are acceptable to use with concrete roof deck: Two plies of 15 lb. roofing felts asphalt in accordance with CRCA Specifications CO-VR- 1 and or WO-VR- 1 and and conforming to CAN/CSA-A Insulation: Polyisocynurate rigid insulation boards conforming to CAN/ULC-S and CAN/ULC-S16-M86. Insulation boards to be tapered or flat as specified on the project drawings. Thickness of insulation to be as specified on the project drawings. Acceptable manufacturers: Atlas Roofing Corporation, IKO Industries, NRG barriers or equal.

4 016/09/13 4/ Cover Board: High density asphalt coated fiberboard conforming to CAN/ULC-S Board to be a minimum of 7/16 thick. Acceptable products: IKO fiberboard sheathing (asphalt impregnated and corted) or equal Roofing Membrane Minimum of two plies of modified Bitumen base sheet unless more plies are shown on project drawings. Roofing membrane shall conform to CGSB-37-GP-56M. Base sheet: Modiflex MP-180-SS (base) by IKO or approved equal. Cap Sheet: Modiflex MP-50-CAP by IKO or approved equal. All plies shall be of mopped grade. Roof membrane reinforcing mat will consist of polyester Flashing and Counter Flashing SBS Modified Bituminous Cap Sheet by IKO, elastobase by Soprema, or elastomeric by Tremco or approved equal Aggregate Coating 3/8 inch washed pea gravel Control Joint Membrane SBS modified Bitumous Cap Sheet by IKO, elastobase by Soprema, or elastomeric by Tremco or approved equal Flashing and Caulking: Flashing and Caulking in accordance with Vale specification SPEC Roof Drains As specified on project drawings.

5 016/09/13 5/ Cant Strip Prefabricated, high density fiberboard Plastic Cement Plastic cut back cement to be in accordance with CGSB 37-GP-6Ma Sealant One component, acrylic base sealant. In accordance with CGSB 19-GP-5M-1984, and according to Specification SPEC entitled "Sealants". 4. PREPARATION Heat asphalt in purpose made roofing kettles equipped with thermometers. Ensure that one man is permanently stationed at kettle to maintain kettle temperature of 00oC to 30oC (About 400oF to 450oF). In this temperature range, draw off asphalt for dispensing on to roofing material. Refill kettle with similar quantities of asphalt in small sized lumps. Do not dilute asphalt with any ingredients. Use truck tanker only if supplementary kettle is used to regulate asphalt in final temperature range. Remove existing metal flashings, vapour barrier and insulation for areas requiring repair or total replacement. Sweep deck clean and dry. Ensure deck is free from water, frost, oil, snow and debris. Prime all concrete surfaces prior to applying asphalt. Allow primer to dry. 4.3 APPLICATION Roofing - General Apply roofing in accordance with manufacturer's specifications and Canadian Roofing Contractors' Association (CRCA) unless superseded or modified by clauses in this specification. Ensure building expansion joints are carried on through the insulation and roofing. Build in roofing accessories and items as work progresses. Do not leave insulation or roofing felts exposed overnight or during inclement weather. Fully coat bare roofing felts with asphalt at the end of days work and before inclement weather.

6 016/09/13 6/1 Primer Install in accordance with manufacturer specification Prime all substrate surfaces that are to receive asphalt, adhesives and membrane. Apply primer at a rate of one gallon per 80 sq. ft. and allow to dry prior to new roofing system application. Vapour Barrier Install in accordance with manufacturer specifications. Repair all fishmouths and damage to the vapour barrier before the installation of insulation. Take extreme caution to avoid the entry of asphalt into the building at roof perimeters and penetrations. Insulation I.S.O. (Polyisocyanurate) Insulation. Maximum board size to be 4 x 4 for asphalt attachment only. Butt insulation boards moderately together without gaps and fit accurately to abutting surfaces such as walls, perimeters, curbs and roof penetrations. Stagger end joints in adjacent rows, ½ sheet but not less than 1. Install roof insulation over vapour barrier and lay solid in type III asphalt applied at a rate of 5-lbs./100 sq.ft. Heat asphalt so that it s mopping temperature is not below 400oF. Walk on insulation boards immediately after placing and for as long as required to ensure full bond to substrate. At irregular deck surfaces, cut insulation facer on top surface in a cross pattern to insure full contact with vapour barrier. No more insulation shall be laid than can be completely covered with roofing membrane on the same day. At the end of the day the roofing membrane shall be turned down over the exposed edges of the last course of insulation and shall be solidly mopped to the deck. This temporary water cut-off is to be removed when roofing work is to resume.

7 016/09/13 7/1 Coverboard Install a minimum of 7/1 fiberboard overlay to the base layer of insulation in hot type II asphalt at a rate of 5 lbs./100 sq.ft. Stagger joints between sheets of fiberboard and between fiberboard and base insulation no less than 1 minimum. Fiber Cant Strips Install cants at all intersections of roofing and vertical surfaces and other locations where cants are not provided. Fiber cant strip will fit snugly into corners and without gaps between pieces. Mop Applied Base Sheets (mopped ply system with gravel) Install membrane free of blisters, wrinkles and fishmouths in accordance with membrane manufacturer s instructions. Start all roofing applications at the lowest point or centre of the roof drain to insure water runs over the laps of the membrane. Embed base sheet in a uniform coating of hot asphalt applied at a rate of 5 lbs./100 sq. ft. Heat asphalt so that it s mopping temperature is not below 400oF. Unroll membrane, a maximum of 4 behind mopping application and carry membrane to top of cant. Lap base sheet 3 1/ on sides and 6 on ends. Asphalt must show continuously at all sides and end laps. Reinforce around all projections and drain using additional ply of base sheet as per manufacturer s instructions. Apply and mop second layer of base sheet such that side laps are staggered a minimum of 1 from laps in base sheet and all end laps a minimum of 4 for base sheet end laps. Avoid walking on freshly laid membrane until asphalt has cooled, to avoid membrane displacement under foot.

8 016/09/13 8/1 Base Sheet Flashings (mopped) Base sheet flashings for curb, wall, parapet and perimeters will consist of a 180 modified base sheet with sand surfaces. Install base flashings with Type III hot asphalt. At perimeter edges install base flashing minimum 3 overlap on to metal flashing and fascia board and extend flashing on to flat roof surface minimum 4 from toe of cant. Nail base sheet flashing at bottom outside perimeter edges at every 6 o/c. Cap Sheet Flashings (mopped) Install flashing free of blisters, sags, wrinkles and fishmouths in accordance with the manufacturer s recommendations. Mop 50 modified cap sheet directly to base sheet flashings proceeding from bottom to top. Extend base flashing on to flat surface minimum 6 from toe of cant. Provide 4 minimum side lap and seal. Stagger joints in cap sheet flashings so that they do not line up with joints in the base sheet flashings. Pea Gravel Prior to application of gravel clean roof surface of any water, snow, ice and debris. Ensure that all membrane flashings are complete and free of any defects. Apply hot asphalt flood-coat using Type III asphalt at a rate of 60-lbs./100 sq.ft. and embed 3/8 pea gravel at a rate of 500 lbs./100 sq. ft. Provide a double pour of asphalt and gravel in all corners. Ensure that there are no skips in flood-coat. If some are found, sweep gravel aside, re-flood area and cover with gravel. After gravel placement clean roof area of extraneous clumps of asphalt and gravel. Roof Drains Install over single layer of base membrane. Apply base sheet flashing 6 larger than the size of flange.

9 016/09/13 9/1 Install cap sheet membrane to edge of opening. Install roof drain clamping ring tightly into place and install drain strainer. Penetration Install roof penetration flashings and seal to membrane in accordance with the flashing and membrane manufacturer s recommendations and details. Top off all penetration with sealant and make waterproof. Slope sealant to assure positive draining of water. 5.0 ROOFTOP WALKWAYS Where rooftop walkways are required, they shall meet the following requirements: Walking surfaces must be made from anti-slip material eg Grating must be serrated All structure and flooring shall be interconnected to prevent possible displacement Walkway shall be equipped with guardrails or anchorage system for lifelines along its entire length Walkway shall be safely accessible without exposing workers to any open hole conditions Live load on the walkway shall be combined with climatic live loads on roof as per local building code All penetrations through roofing materials shall be watertight to prevent leakage 6.0 TESTING Consistent with the General Terms and Conditions, the Vale Representative may remove or cause to have removed test patches. Normally, patches are no more than 4 inch square and limited to three per job or not more than one per 10 square on a large area. Hot mop test patches back in place and cover with a fibreglass and mastic patch extending 6 inches around patch.

10 016/09/13 10/1 7.0 GUARANTEES/WARRANTEES Application standards will be according to the Canadian Roofing Contractors Association (C.R.C.A.) and manufacturer s specifications. A two-year warranty will be provided for the roofing application of this project

11 016/09/13 11/1 8.0 REFERENCE DOCUMENTATION The following documents are related to this specification and shall be used to their latest revision: SPEC SPEC CSA A CGSB 37-GP-9Ma-83 CAN/ULC-S CGSB 37-GP-56M, 1985 CAN/ULC S706-0 CSA B CRCA Roofing Manual ULC, Underwriters Laboratories of Canada CAN/ULC S CAN/ULC-S CAN/ULC-S16-M86 OSHA OBC Flashing Sealants Asphalt for use in construction of built-up roof coverings and dampproofing and waterproofing systems. Primer, asphalt, unfilled, for asphalt roofing, dampproofing and waterproofing Thermal insulation, polyurethane and polyisocyanurate boards, faced Membrane, modified, bituminous, prefabricated and reinforced for roofing Insulation fiberboard Wire nails, spikes and staples Canadian Roofing Contractors Association List of Equipment and Materials Volume II Building Construction including supplements to date Roof Assembly Classification: FM roof assembly classification for wind uplift requirement of Class 1A-90, in accordance with FM Construction Loss prevention Data, Bulletin 1-8 and 1-9 Standard Test Method of Determination of Long-term Thermal Resistance of Closed-Cell Thermal Insulation Foams (LTTR) Fire Tests of Roof Covering Test for Fire Spread Under Roof Deck Assembly Occupational Health and Safety Act Regulations for Mines and Mining Plants O.Reg 854 Building Code

12 016/09/13 1/1 9.0 REVISION AND TRANSITION NOTES Revision notes describe: what was changed, and if applicable, why it was changed, and the plan to implement the change, including whether changes are retroactive. Note: The revision notes are a summary of the changes and may not necessarily be a complete list. A risk code is entered for each revision and if applicable, the revision notes will describe how risk was addressed for the revision. Risk Code A Risk Category This revision is a minor change and/or introduces no risk. B C Risk has been addressed for this revision by the reviewer and approver. Low risk or no new hazards identified. For this revision, a PHR or other risk management tool has been used to address risk and minimize hazards. This risk assessment has been documented and is available through Central Engineering. Rev 1 Revision Notes Document format and number changed due to Vale Engineering Document Program changes in 011. Previous Standard number was Rev 3. Associated drawings added Section regarding rooftop walkways added to meet RAC s requirements Document reviewed Format updated No other changes Risk Code Approved by Reviewed by Issue Date YYYY/MM/DD --- AA AA 01/07/19 A A.Alaeddine A.Rafi 016/09/13