Foam Insulation Under Metal Roof

Insulating a metal shed roof with rigid foam can be done one of three ways by laying the board prior to applying the roof by removing the existing roof and installing new foam board or by insulating the existing metal roof from the inside.

Foam insulation under metal roof. For metal roofing it is fairly common to use architectural grade roofing without. Use foam batting the best material for use with metal roof insulation is in the form of foam batting. Polyurethane spray foam metal roof insulation in order to add moisture barrier under metal roof you can spray the undersides of the roof by using a thick layer of polyurethane spray foam. Use rigid foam insulation to cover wider spans of roof sheathing between joists.

We ll add a vapor barrier so the moist air does not flow up through the insulation and condense on the roof. But a preinstalled membrane may be even more effective at removing condensation. 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 underlayment is recommended under a metal roof and in most cases the shiny side should be facing up but there s a catch.

Insulating with spray foam insulation. Can i apply spray foam insulation directly to the underside of a metal roof. Most unvented attics incorporate spray polyurethane foam spf on the underside of the roof deck and attic walls. Traditionally we ve insulated the roof panel to try and keep the temperature on the panel from reaching the dew point.

This is different from the normal roll up type of insulation as it comes in panels rather than paper covered fiberglass. Cut each sheet to the desired size using a utility knife then fasten it in place using staples or adhesive. The problem with using. An open cell foam about 0 5 pound density is the most.

Let s start with the foam side of the equation first. Avoids nails or screws which could penetrate the metal roof and cause leaks. It will help you to eliminate problems that may come when the house becomes extremely cold in the winter and terribly hot in the summer.