Polyurethane Foam Insulation Vapor Barrier

Combined air barriers vapor barriers and moisture barriers can be provided in a single material closed cell spray polyurethane foam is perhaps the best example.

Polyurethane foam insulation vapor barrier.

Must be protected by an ignition barrier or if the. It s important to understand these three. At a typical thickness of 5 open cell foam is rated from 5 to 10 perms. The 1 question to ask before putting spray foam in your attic.

This document explains thermal and ignition barriers in more detail and gives the code references and testing requirements. Closed cell foam is a vapor barrier closed cell foam has a much higher r value than open cell foam about r 6 5 per inch and it s a vapor barrier as well as an air barrier. Spf or spray polyurethane foam describes a category of high performance spray foam insulation and air barrier material that delivers multiple benefits in one application. As mentioned earlier batt and roll insulation come with a vapor barrier attached.

However an installation between the studs can pose a challenge. The research reported here investigated the ability of typical framed walls using spray polyurethane foam insulation with and without additional vapor barrier layers to meet these requirements. Spray polyurethane foam insulation spf is a relatively new product to the residential building. Dc315 meets ibc irc codes in the usa canadian nbcc and many international building code requirements.

To complete the vapor barrier you would want to foam seal or tape all the sides where the rigid meets timber because these gaps will facilitate vapor flow. One manufacturer demilec says its heatlok high lift spray foam has an even higher r value r 7 5 per in closed cell foam is much denser about 2 lb. A vapor barrier is designed to keep moisture in your home from getting inside your walls. For more information on this topic building science press published a research report in 2009 on the need for a vapor barrier in above grade walls with spray polyurethane foam which is located.

4 pitfalls of spray foam insulation. Dc315 fireproof paint is a fully tested and approved intumescent coating to meet 15 minute thermal barrier and ignition barrier protection over spray polyurethane foam spf. Rigid foam insulation is usually a qualified vapor barrier. However an installation between the studs can pose a challenge.

Download thermal and ignition barriers for the spf industry pdf from the spray polyurethane foam alliance. These advantages include high insulation values near zero air permeability increased building strength severe weather and flood resistance increased occupant comfort. However leakage can occur where the facings meet.