June 2006
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Getting stickier

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Adhesive attachment for roof insulation systems is becoming more predominant

by James R. Kirby, AIA
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Roofing contractors always are looking for better, quicker and easier methods to install insulation in roof systems. Sometimes, there are job-specific constraints, such as the inability to use mechanical fasteners (screws and plates) or materials that create unpleasant odors. When something like this occurs, the use of a polyurethane roof insulation board adhesive may be the solution.

Types

There are two types of polyurethane roof insulation board adhesives used to secure elements of roof systems: one-component and two-component. One-component products generally are known as "moisture-cured" adhesives, and two-component products generally are known as "chemically cured" adhesives. Both inherently do not penetrate deck systems and are considered to be odorless or low-odor materials.

To properly activate and set, one-component adhesives rely on moisture in the air. One-component adhesives generally are sprayed from a portable, pressurized container using a wand that produces a polyurethane foam bead or poured from 1-, 2 1/2- or 3-gallon canisters in a semiliquid state. A single canister can be used to place a single bead of adhesive, or a wheeled piece of equipment capable of carrying four or more canisters of adhesive can be used to place multiple beads of...



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