Rigid Foam Board Under Metal Roof

You can always install this foam on the inside and outside of the sheath.

Rigid foam board under metal roof.

It can lie down perfectly under the metal roofing without having to deal with the hassle. Avoids nails or screws which could penetrate the metal roof and cause leaks. 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. 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. 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. The insulation you choose will be highly dependent on your budget. It is not the normal insulation type that can be rolled up.

It can be touted that foam batting material is the best one to pair with metal roof insulation. 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. Rigid insulation is one of the best tools to reduce your energy costs. Rigid foam insulation also known as insulating boards provide high r values.

Rigid foam boards come in different material compositions varying thicknesses and different insulating r value properties. Spray foam generally outperforms batt and blanket but loose fill and rigid board are good options too. Insulating with spray foam insulation.