Rigid Foam Board Under Metal Roof

Use rigid foam insulation to cover wider spans of roof sheathing between joists.

Rigid foam board under metal roof.

It is not the normal insulation type that can be rolled up. Spray foam generally outperforms batt and blanket but loose fill and rigid board are good options too. You can always install this foam on the inside and outside of the sheath. Avoids nails or screws which could penetrate the metal roof and cause leaks.

You can even place it under the foundation slab. Rigid insulation is one of the best tools to reduce your energy costs. Basically speaking ignoring sub insulated roofs which are a special case with rigid foam board insulation directly under the metal roofing the roofing needs proper support to be able to handle snow ice loads wind loads and walking on during installation cleaning and maintenance. Cut each sheet to the desired size using a utility knife then fasten it in place using staples or adhesive.

Rigid foam boards come in different material compositions varying thicknesses and different insulating r value properties. It can lie down perfectly under the metal roofing without having to deal with the hassle. Rigid board made from fiberglass would be the best option for roofs and basements as the high insulation rating allows it to insulate the home better than say loose fill or batt and blanket. The insulation you choose will be highly dependent on your budget.

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. Insulating with spray foam insulation. Install it anywhere from the roof to the foundation.