Johns Manville EPDM Membrane Installation Guidelines
Johns Manville EPDM Membrane Installation Guidelines
| Notice to the Reader:
The instructions provided below are reprinted from the manufacturer's own materials which were submitted to the RoofStar Guarantee Program for inclusion in this Manual. The reader is urged to check these against current publications issued by the manufacturer, to ensure accuracy. |
Manufacturer: JOHNS MANVILLE CORPORATION
Contact Address: See Membership List in Section 1.
Product Group: EPDM MEMBRANE
1 Description
JM EPDM (ethylene, propylene, diene monomer) elastomeric membrane is the key component used in Johns Manville roofing and waterproofing systems. The membrane is applied in large sheets to reduce field seams. Exceptional long-term elasticity permits the material to withstand normal building movement without cracking or tearing. It can withstand severe temperature fluctuations and prolonged ozone exposure and remain ultraviolet-stable under constant exposure to intense sunlight. The membrane is available in black reinforced or non-reinforced depending on the type of application. JM EPDM is manufactured in standard widths up to 12.19 m (40') and standard lengths up to 30.48 m (100'). Standard thicknesses are 1.11 mm (0.045"), 1.52 mm (0.060") and 2.28 mm (0.090"). Special sizes and thicknesses are also available.
1.1 GENERAL
- The roofing assembly / material information published in the RCABC Roofing Practices Manual does NOT represent a complete set of the Manufacturer's published data, nor does it represent a detailed specification. The preparation of a detailed specification is the responsibility of the design authority.
SYSTEM DESCRIPTIONS/RANGE OF APPLICATION
- Use in commercial, institutional, and industrial construction.
- Used in new construction and re-roofing of existing roofs.
- Roofing applications include: Fully Adhered Roofing Systems, Ballasted Roofing Systems; and Mechanically Fastened Roofing Systems.
- Waterproofing systems can be applied to horizontal or vertical surfaces.
DELIVERY, STORAGE AND HANDLING
- Deliver and store materials in original package and containers with manufacturer's name, brand name and installation instructions intact.
- All materials, except membrane must be stored between +15.5°C (+60°F) and 26.5°C (+80°F).
SITE CONDITIONS (CAUTIONS AND WARNINGS)
- Prior to the use of any product, consult the manufacturer's safety data bulletin for application cautions and warnings.
- Do not use bitumen-based roof cement.
- Do not install EPDM membrane directly onto low melting point asphalt (CSA A123.4-M1979, Type 1or 2).
- Do not allow waste products (petroleum, grease, oil, solvents, vegetable or mineral oil, animal fats, etc.) or direct steam venting to come in contact with JM EPDM Systems.
STANDARDS AND APPROVALS
- Underwriters Laboratories: Listed.
- Factory Mutual: Various approvals listed.
MANUFACTURER'S SERVICES
- Technical Services: applicator training, technical seminars, field training, field inspections, and technical assistance are available.
- Specifications / Drawings: Systems Design and Review group to respond to daily design inquiries.
WARRANTY
- Warranty availability shall be limited to an RoofStar Five (5) or ten (10) Year system warranty with RGC inspection only.
1.2 MATERIALS
| NOTE: Regardless of the materials listed below or anywhere else in these manufacturer's guidelines, only materials accepted for use in the RoofStar Guarantee Program, or accessories associated with those materials, may be used to qualify for a RoofStar Guarantee. To see a list of the manufacturer's products accepted for use in the RoofStar Guarantee Program, click on the link above. |
- The components of the JM Roofing Systems are to be products of Johns Manville.
MEMBRANE
- Non-reinforced JM EPDM membrane in 1.11 mm (45 mil.), 1.52 mm (60 mil.) and 2.28 mm (90 mil.). Used in ballasted and fully adhered applications.
- Reinforced JM EPDM membrane in 1.11 mm (45 mil.) and 1.52 mm (60 mil.). Used in fully adhered, ballasted and mechanically fastened applications.
JM MEMBRANE ACCESSORIES
- Bonding Cement
- Bonds membrane to substrate. Solvent or water based.
- Lap Caulk
- Seals edges of membrane or flashings.
- Lap Cement
- Used to seal laps
- Peel & Stick T-Joint Patch
- Used for covering three-way membrane laps in field of roof.
- Peel & Stick Coverstrip
- Used for covering seams in some applications and stripping in.
- Peel & Stick Flashing
- Flashing for perimeters and penetrations
- Peel & Stick Inside / Outside Corner
- Flashing for corners
- Peel & Stick Pipe Boot
- Flashing for pipe penetrations
- Peel & Stick Pourable Sealer Pockets
- Flashing for irregular or ganged penetrations
- Peel & Stick RTS
- Reinforced termination strip. Secures membrane to perimeter.
- Peel & Stick Seam Tape
- Used to adhere membrane seams (laps).
- Peel & Stick Walkpad
- Membrane protection and walking path for high traffic areas
- Pipe Boot
- Flashing for penetrations
- Pourable Sealer
- Flashing for penetrations
- RTS
- Reinforced termination strip. Secures membrane to perimeter.
- Sealing Mastic
- Water cut-off
- Splice Cleaner
- Cleans membrane surface before adhering.
- Stone Mat
- Protection mat used with crushed stone.
- Tape Primer/Wash
- Cleans and primes rubber for peel and stick accessories and tapes.
- Uncured Flashing
- Flashing for perimeters and penetrations
- Walkpad
- Membrane protection and walking path for high traffic areas
RELATED MATERIALS
- .1 Ballast
- Rounded water-worn gravel, steel-troweled smooth-surface paver blocks and abrasive-surface paver blocks, or crushed stone underlaid with Protective Mat are acceptable ballast.
- .2 Wood Nailers
- Pressure-treated with salt preservatives.
- .3 Thermal Barrier
- 19 mm (3/4") thick perlite or 15.9 mm (5/8") thick type “X” gypsum board may be used to provide a stable underlayment for the roofing system or to comply to code requirements.
- .4 Vapour Retarder
- For protection of the insulation, a vapour retarder should be considered.
1.3 EXECUTION
PREPARATION
- Proper decking for the substrate shall be provided to receive the JM System.
- Substrates must be clean, smooth, dry, and free of fins, loose or foreign materials, oils, grease and roof cements.
- Ensure parapet substrates are suitable for adhering membrane flashings; where sheathing is required, plywood is strongly recommended, minimum exterior grade gypsum board (conforming to CSA A82.27-M1977) is required.
- Insulation must be compatible with roof membrane systems.
- Ensure plywood substrates are screwed (when EPDM applied directly over decks); alternatively, provide protection between nailed decks and membrane.
FULLY ADHERED MEMBRANE
- Position membrane and allow to relax for approximately 30 minutes.
- Fold sheet back exposing half of the underside; ensure fold is smooth without wrinkles or buckles.
- Apply bonding adhesive evenly without globs or puddles, using a 225 mm (9") wide plastic core short nap paint roller to both the sheet and the substrate.
- Allow adhesives to dry until tacky, but not stringy to the touch; roll coated membrane into the coated substrate, avoiding wrinkles.
- Brush down the bonded half of the sheet, fold back un-bonded half, and repeat the bonding procedure.
- Do not apply bonding adhesive to the splice area.
- Install adjoining sheet in the same manner, overlap edges a minimum of 75 mm (3").
LOOSE-LAID MEMBRANE
- Unroll and position membrane, allow it to relax approximately 30 minutes prior to splicing or membrane securement.
- Position adjoining sheets in same manner overlapping edges a minimum of 75 mm (3").
MECHANICALLY FASTENED SYSTEM
- Confirm that a wind design review has been completed and sheet layouts and fastening patterns have been approved for individual projects. Johns Manville will provide technical assistance as required.
- .1 Unroll and position membrane and allow it to relax approximately 1/2 hour.
- .2 Secure the membrane with JM in-seam plates as per Johns Manville published specifications.
- .3 Position adjoining sheets to allow a minimum overlap of 150 mm (6").
SEAMS
- Johns Manville JM EPDM systems are to be installed using TAPE ONLY seaming applications. Please refer to the JM application specification for complete installation.
MEMBRANE SECUREMENT
- Securement shall be provided at the perimeter of each roof level, and at any angle change where slope or combined slopes exceed 1:6 (2" in 12").
- Securement shall be with RTS and acceptable JM fastener.
FLASHING
- Complete all flashing detail and termination according to Johns Manville’s JM published specifications.
FASTENERS
- a) High Load fasteners and plates
- b) High Load ASAP fastener
- c) UltraFast Fasteners and Plates
- d) UltraFast ASAP fasteners
- e) Structural Concrete Deck Fasteners and Plates
- f) NTD-1H & 2H fasteners
2 Membrane Assemblies
2.1 JM Roofing System Fully Adhered Membrane Assembly
Slope Limitation: No slope restrictions.
| ROOF ASSEMBLY | ||
| Components | Options | Comments or Cautions |
| Roof Deck | Wood / Plywood | All defects in the deck must be corrected. Membrane may be directly adhered to smooth clean concrete, wood, or plywood decks. |
| Concrete | ||
| Steel | ||
| Fibrous Cement / Gypsum | ||
| Thermal Barrier | Perlite | Perlite or gypsum board may be used to provide stable underlayment for roofing systems or to comply with code requirements. |
| Gypsum | ||
| Vapour Retarder | Designer’s Option | May be required for the protection of the insulation. |
| Insulation | ENRGY 3 | Mechanically fasten to deck. Membrane can only be fully bonded to insulation overlayment listed below. |
| ISO 3 | ||
| Insulation Overlay | Fesco Board | Mechanically fasten overlayment to deck, with minimum of one fastener every 0.185 meters squared (2 sq ft). |
| Adhesive | EPDM Bonding Cement | Fully bonds surface areas. |
| Membrane | 1.11 mm (0.045"), 1.52 mm (0.060"), and 2.28 mm (0.090") Reinforced and non-reinforced EPDM | Maximum 12.19 m (40') wide, maximum 30.48 m (100')long. |
2.2 JM Roofing System Ballasted EPDM Membrane Assembly
Slope Limitation: Must not exceed 1:6 (2" in 12").
| ROOF ASSEMBLY | ||
| Components | Options | Comments or Cautions |
| Roof Deck | Wood / Plywood | Decks must withstand ballast loads of up to 90 kg / m2 (18 lb / sq. ft) for FM wind design. Standard loads are 50 kg / m² (10 lb / sq. ft) |
| Concrete | ||
| Steel | ||
| Fibrous Cement / Gypsum | ||
| Thermal Barrier | Perlite | Perlite or gypsum board may be used to provide stable underlayment for roofing systems or to comply with code requirements. |
| Gypsum | ||
| Vapour Retarder | Designer's Option | May be required for the protection of the insulation. |
| Insulation | ENRGY 3 | May be loose laid. |
| ISO 3 | ||
| Membrane | 1.11 mm (0.045") JM EPDM | Loose-laid. |
| 1.52 mm (0.060") JM EPDM | Loose-laid. | |
| 2.28 mm (0.090") JM EPDM | Loose-laid. | |
| Non-reinforced and Reinforced JM EPDM | ||
| Ballast | Gravel | 38 mm (1-1/2") nominal diameter applied at 50 kg / m² (10 lb / sq.ft). Crushed stone requires protective mat underlayment. |
| Crushed Stone | ||
| Concrete Pavers | ||
2.3 JM Roofing System Mechanically Fastened Membrane Assembly
Slope Limitation: No slope restrictions.
| ROOF ASSEMBLY | ||
| Components | Options | Comments or Cautions |
| Roof Deck | Wood / Plywood | Decks must provide required withdrawl resistance; minimum published fastener pull out requirements; and FM wind uplift zone minimums all to be specified by the design authority. |
| Concrete | ||
| Steel | ||
| Fibrous Cement / Gypsum | ||
| Thermal Barrier | Perlite | Perlite or gypsum board may be used to provide stable underlayment for roofing systems or to comply with code requirements. |
| Gypsum | ||
| Vapour Retarder | Designer's Option | May be required for the protection of the insulation. |
| Insulation | ENRGY 3 | Mechanically fasten insulation with minimum of one fastener and plate every 0.74 m² (8 sq. ft.). |
| ISO 3 | ||
| Membrane | 1.11 mm (0.045") and 1.52 mm (0.060") Reinforced JM EPDM | Mechanically fastened. |
| Wind Design | Must be completed by the roofing consultant and meet FM requirements | |