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(Spec. ID)-C1. CSI 3-Part Specifications. Large file (>500kB).

/1/resourcefile/01/09/14/jmlogo.jpg (11366 bytes) APP Modified Bitumen Specifications
Specification (Spec. ID)-C1

Johns Manville (JM) Cold Adhesive APP and PAO Modified Bitumen Roofing System, Squeegee Method. One-Part Adhesive for use in Cold Process APP and PAO Modified Bitumen Systems on inclines up to 3" per foot (250 mm/m).

For Regions 1, 2 and 3

General

JM has developed an adhesive, MBR � Cold Application Adhesive, for use with APP and PAO modified bitumen products which can be used as a direct substitute for Type III and IV asphalts in hot application with PAO or heat weld applications with APP specifications. We do not recommend other solvent based mastic adhesives for use with APP and PAO products. Most of these products contain excessive quantities of solvent which can damage the modified bitumen compound. The JM adhesive has about one third of the solvent found in most other brands of "Modified Bitumen Adhesives".

MBR Cold Application Adhesive is ideal for applications where hot asphalt is prohibited, not desirable or impractical.

The surface on which the modified bitumen membrane is to be applied should be one of the JM roof insulations or an approved substrate.

Poured and precast concrete, and any other surface with dust present requires priming with JM Concrete Primer. The primer must completely dry before adhesive application begins. The finished surface must be clean, dry, flat and smooth.

Design and installation of the deck and/or substrate must result in the roof draining freely, to outlets numerous enough and so located as to remove water promptly and completely. Areas where water ponds for more than 24 hours are unacceptable and will not be eligible for a JM Roofing System Guarantee.

Note: This specification is also for use with JM PAO (Classic) products. All general instructions contained in the current JM Commercial/ Industrial Roofing Systems Manual shall be considered part of this specification.

Flashings

Flashing details can be found in the "Bituminous Flashings" section of the JM Commercial/Industrial Roofing Systems Manual.

Application

Refer to the APP and PAO modified bitumen specifications for the "Spec ID" portion of the specification designation and specific layup details. The number of starter sheets and their sizes vary depending on the number of plies being used in the membrane.

On roof decks with slopes up to 1/2" per foot (41.6 mm/m) the roofing felts and modified bitumen sheet may be installed either perpendicular or parallel to the roof incline. For slopes over 1/2" per foot (41.6 mm/m) roofing felts must be installed parallel to the incline and must be nailed. Refer to the hot asphalt modified bitumen specifications for fastener spacing and specific felt lay-up recommendations.