Johns Manville PVC Membrane Installation Guidelines
Johns Manville PVC Membrane Installation Guidelines
Contents
| 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: POLYVINYL CHLORIDE MEMBRANES
1 Description
1.1 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. |
MEMBRANES
Consult the list of Accepted Materials by clicking on the MATERIALS link above. For more product details, installation requirements and limitations, consult the manufacturer's Specifications.
1.2 EXECUTION
Consult the Manufacturer's website for installation guidelines for PVC Membrane Roof Systems.
2 Membrane Assemblies
2.1 Mechanically Fastened Membrane Roof Assembly - Insulated and Un-insulated
Slope Limitation: No limit
- In-Service Performance Min.
- -40°C (- 40°F)
- Temperature of the Membrane
- Max.: +54°C (+130°F)
Application: For use over all types of decks, new construction and recover, in assemblies subject to high wind conditions. No slope limitations, lightweight.
| ROOF ASSEMBLY | ||
| Components | Options | Comments or Cautions |
| Roof Deck | Wood / Plywood | Uninsulated steel decks will require an underlay for the roof membrane. Uninsulated concrete and wood decks will require separation sheet. |
| Concrete | ||
| Steel | ||
| Underlay | Gypsum board | Minimum 12.7 mm (1/2") required over uninsulated steel decks, mechanically-fastened. Note: Minimum thickness determined by flute spanability. Some steel may require greater minimum thickness. Minimum 6 mm (1/4") Dens-Deck over wood, mechanically fastened. Gypsum board may be required as a thermal barrier between steel deck and combustible insulation (see Building Code). |
| Plywood | ||
| Georgia-Pacific’s “Dens-Deck” | ||
| Vapour Retarder | JM Approved Manufacturer | Vapour retarder may be required. It is the sole responsibility of the design professional to determine the need for a vapour retarder and its type and location in the roofing system. |
| Insulation | Polyisocyanurate | Must meet Fed. Spec HH-I-1972. Mechanically fastened. Must have non-asphaltic or foil facers. New construction or recover. |
| ENRGY 3 JM ISO 1 | Polyiso with inorganic facers | |
| JM 1/2" Retro-Fit Board Roof Insulation | Perlite for overlayment purposes in new construction and complete tear-offs only. Contact JM’s Technical Department for exceptions in recover applications. | |
| ISO Composite | ||
| JM Fesco Foam Roof Insulation | ||
| Separation Sheet | UltraGard PVC DN Flameguard | Fire-retardant slipsheet in certain UL and / or FM assemblies. |
| JM Polyester Mat Protection Material | Required between membrane and polystyrene boards. | |
| Membrane | UltraGard PVC SR Series | Fastening patterns in accordance with manufacturer’s requirements. Contact JM’s Technical Department for non-standard applications. |
| UltraGard PVC Plus | ||
| UltraGard PVC V-2 Series | ||
| Fasteners | JM supplies a complete line of fasteners for all types of decks. Refer to JM’s price list data or JM’s Technical Department for proper fastener selection. | |
| Flashing | PVC-clad Metal | PVC-clad metal, 24 gauge galvanized steel, suitable for flashing and edge details. |
| UltraGard PVC Detail Membrane | Detail Membrane, unreinforced, 2.03 mm (80 mil). | |
2.2 Loose-Laid and Ballasted Membrane Roof Assembly - Insulated and Un-insulated
Slope Limitation: 1:6 (2" in 12")
In-Service Performance Min.: -40°C (- 40°F)
Temperature of the Membrane:
- Max.: +54°C (+130°F)
- Application: For use in commercial, institutional and industrial roofing applications over most types of roof deck construction. Note: For limited foot traffic.
| ROOF ASSEMBLY | ||
| Components | Options | Comments or Cautions |
| Roof Deck | Wood / Plywood | Design Authority must ensure deck is capable of supporting structural load. Uninsulated steel decks will require an underlay for the membrane. Concrete decks will require a smooth, trowelled finish if uninsulated. Uninsulated wood decks will require separation sheet. |
| Concrete | ||
| Steel | ||
| Underlay | Gypsum board | Minimum 12.7 mm (1/2") required over uninsulated steel decks, mechanically-fastened. Note: Minimum thickness determined by flute spanability. Some steel decks may require greater minimum thickness. Gypsum board may be required as a thermal barrier between steel deck and combustible insulations (see Building Code). |
| Plywood | ||
| Georgia-Pacific’s “Dens-Deck” | ||
| Vapour Retarder | JM Approved manufacturer | Vapour retarder may be required. It is the sole responsibility of the design professional to determine the need for a vapour retarder and its type and location in the roofing system. |
| Insulation | Polyisocyanurate | Must meet Fed. Spec HH-I-1972. Mechanically fastened. Must have non-asphaltic or foil facers. New construction or recover. |
| ENRGY 3 JM ISO 1 | Polyiso with inorganic facers. | |
| JM 1/2" Retro-Fit Board Roof Insulation | For overlayment purposes in new construction and complete tear-offs only. Contact JM’s technical department for exceptions. | |
| ISO Composite | ||
| JM Fesco Foam Roof Insulation | Polyisocyanurate foam laminated to perlite | |
| Separation Sheet | UltraGard PVC DN Flameguard | Fire-retardant slipsheet in certain UL and / or FM assemblies. |
| JM Polyester Mat Protection Material | Required between membrane and polystyrene boards. | |
| Membrane | UltraGard PVC SR Series | |
| UltraGard PVC Plus | ||
| UltraGard PVC V2 Series | ||
| Ballast | Stone | ASTM Standard D448, nominal 38 mm (1-1/2") (#3, #4, #24), or nominal 63 mm (2-1/2") (#1, #2), smoothwashed, river bottom stone |
| Concrete Pavers | Must be installed over one layer of JM polyester mat protection material | |
| Fasteners | JM supplies a complete line of fasteners for all types of decks. Refer to JM’s price list data or JM’s Technical Department for proper fastener selection. | |
| Flashing | PVC-clad Metal | PVC-clad metal, 24 gauge galvanized steel, suitable for flashing and edge details. |
| UltraGard PVC Membrane | UltraGard PVC Membrane, same thickness as field membrane, may be fully adhered or loose laid, anchored with 75 mm (3") strips of PVC-clad metal. | |
2.3 Fully Adhered Membrane Roof Assembly - Insulated and Un-insulated
Slope Limitation: Vertical
- In-Service Performance Min.
- -40°C (- 40°F)
- Temperature of the Membrane
- Max.: +54°C (+130°F)
Application: For use over all types of roof decks: lightweight designs, unusual shapes and configurations, (domes, etc.). A variety of colours are available.
| ROOF ASSEMBLY | ||
| Components | Options | Comments or Cautions |
| Roof Deck | Wood / Plywood | Membrane may be adhered directly to concrete (trowel finish). Uninsulated wood and steel decks require underlayment. |
| Concrete | ||
| Steel | ||
| Underlay | Georgia-Pacific’s “Dens-Deck” | Minimum 6.4 mm (1/4") mechanically-fastened to wood or steel deck. Note: Minimum thickness for steel decks are determined by flute spanability. Some steel decks may require greater minimum thickness. |
| Vapour Retarder | JM Approved Manufacturer | Vapour retarder required in certain high humidity applications. It is the sole responsibility of the design professional to determine the need for a vapour retarder and its type and location in the roofing system. |
| Base Sheet | JM Approved Manufacturer | Base sheet, if required for securement purposes, must be an asphalt coated #40 base sheet. May be mechanically fastened or attached with Type III steel asphalt. |
| Insulation | Polyisocyanurate | Must meet Fed. Spec HH-I-1972. Must be mechanically fastened to “standard” decks (24 gauge or greater steel, poured structural concrete 3000 psi or greater, 16 mm (5/8") or greater plywood and 25 mm (1") minimum wood plank). In some applications, JM may permit the use of Type III, steep asphalt, to attached the insulation to structural concrete, base sheets, or existing BUR Systems. |
| ENRGY 3 JM ISO 1 | Polyiso with inorganic facers | |
| Wood Fibre Board | For overlayment purposes in new construction and complete tear-offs only. Contact JM’s Technical Department for exceptions in recover applications. | |
| Fasteners | JM supplies a complete line of fasteners for all types of decks. Refer to JM’s price list data or JM’s Technical Department for proper fastener selection. | |
| Membrane | UltraGard SR Series | Solvent-based adhesive suitable for all fully adhered applications. Latex-based adhesive can only be used on smooth, trowel finished, poured structural concrete decks and approved wood fibre insulations. |
| UltraGard PVC Plus Series | ||
| UltraGard PVC V-2 Series | ||
| UltraGard PVC latex adhesive cannot be used over polyisocyanurate insulation. Latex adhesive should not be stored or used at temperatures below 5°C (40°F) for a 24 hour period. UltraGard PVC latex adhesive should not be used on roofs where the slope exceeds 1:8 (1.5": 12"). NOTE: JM’s adhered membrane must be mechanically attached at all peaks, valleys and slope intersections where net change in slope exceeds 1:8 (1.5": 12"). Contact JM’s Technical Department for specific recommendations. | ||
| Flashing | PVC-clad Metal | Flashing for details and edges. |
| UltraGard PVC SR Membrane | May be SR Series. Thickness to match field sheet. | |
2.4 Protected Membrane Roof Assembly - Insulated and Un-insulated
- In-Service Performance Min.
- -40°C (- 40°F)
- Temperature of the Membrane
- Max.: +54°C (+130°F)
Application: For use in commercial, institutional, and industrial roofing applications over most types of roof deck construction. Note: For excessive foot traffic and protection of the membrane from mechanical damage.
| ROOF ASSEMBLY | ||
| Components | Options | Comments or Cautions |
| Roof Deck | Wood / Plywood | Design Authority must ensure deck is capable of supporting structural load. Uninsulated steel decks will require an underlay for the membrane. Concrete decks will require a smooth, trowelled finish if uninsulated. Uninsulated wood deck will require slipsheet. |
| Concrete | ||
| Steel | ||
| Underlay | Gypsum Board | Minimum 12.7 mm (1/2") required over uninsulated steel decks mechanically fastened. Note: Minimum thickness determined by flute spanability. Some steel decks may require greater minimum thickness. Gypsum board may be required as a thermal barrier between steel deck and combustible insulations (See Building Code). |
| Plywood | ||
| Georgia-Pacific’s “Dens-Deck” | ||
| Vapour Retarder | JM Approved | Vapour retarder may be required. It is the sole responsibility of the design professional to determine the need for a vapour retarder and its type and location in the roofing system. |
| Manufacturer | ||
| Insulation (For use under membrane) | Polyisocyanurate | Must meet Fed. Spec. HH-I-1972. Mechanically fastened. Must have non-asphaltic or foil facers. New construction or recover. |
| ENRGY 3 JM ISO 1 | Polyiso with inorganic facers | |
| Insulation (Continued) | Fesco Board | Minimum 1-1/2" over steel decks. One asphalt coated and one plain side, coated side must be down, or have an appropriate slipsheet. |
| ISO Composite JM Fesco Foam Roof Insulation | ||
| Separation Sheet | UltraGard PVC DN Flameguard | Fire-retardant slipsheet in certain UL and / or FM assemblies. |
| Polyester Mat Protection Material | Required between membrane and polystyrene boards. | |
| Membrane | UltraGard PVC V2 Series | Loose laid |
| Insulation (Above Membrane) | Extruded Polystyrene | Requires polyester mat protection material between membrane and polystyrene boards. |
| Dow Chemical Co. & equivalent by Owens Corning or equivalent by Celfortec | SM and RM, HI-40 and HI-60. Dow’s LG product will be reviewed by JM’s Technical Department and is subject to approval on a job-to-job basis only | |
| Ballast | Stone | ASTM Standard D448, nominal 38 mm (1-1/2") (#3, #4, #24), or nominal 63 mm (2-1/2")(#1, #2), smoothwashed, river bottom stone. |
| Concrete Pavers | Must be installed over one layer of polyester mat protection material. | |
| Fasteners | JM supplies a complete line of fasteners for all types of decks. Refer to JM’s price list data or JM’s Technical Department for proper fastener selection. | |
| Flashing | PVC-clad Metal | PVC-clad metal, 24 gauge galvanized steel, suitable for flashing and edge details. SR membrane, same thickness as field membrane, may be fully adhered or loose laid, anchored with 75 mm (3") strips of PVC-clad metal. |
| UltraGard PVC Membrane | ||