Foam Insulation Under Metal Roof

The guide on how to insulate under metal roof panels overview.

Foam insulation under metal roof.

This is different from the normal roll up type of insulation as it comes in panels rather than paper covered fiberglass. It would be better to use a closed cell 2 pound density foam because it doesn t expand as much as open cell and is more likely to fill voids but not go through them. This foam can be used on either the outside or the inside of the sheathing. This construction approach was first used in the 1970s and it has been implemented much more widely since it was first included in the international code council s icc model building code in 2007 irc section 806 4.

Foil insulation is a radiant barrier and it works by. Foil insulation underlayment is recommended under a metal roof and in most cases the shiny side should be facing up but there s a catch. Most unvented attics incorporate spray polyurethane foam spf on the underside of the roof deck and attic walls. An open cell foam about 0 5 pound density is the most cost effective way to insulate but any opening over 1 16 could cause the foam to expand out onto the roof.

Use rigid foam insulation to cover wider spans of roof sheathing between joists. Cut each sheet to the desired size using a utility knife then fasten it in place using staples or adhesive. Tips to install metal roof insulation. It can be touted that foam batting material is the best one to.

Avoids nails or screws which could penetrate the metal roof and cause leaks.