Rigid Foam Board Under Metal Roof

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

Rigid foam board under metal roof.

Spray foam generally outperforms batt and blanket but loose fill and rigid board are good options too. Fiberglass is also one of the preferred materials for metal and steel buildings and homes. Insulating with spray foam insulation. 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. Install it anywhere from the roof to the foundation. 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 foam insulation also known as insulating boards provide high r values.

You can even place it under the foundation slab. You can always install this foam on the inside and outside of the sheath. Use rigid foam insulation to cover wider spans of roof sheathing between joists. 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.

It can be touted that foam batting material is the best one to pair with metal roof insulation. It can lie down perfectly under the metal roofing without having to deal with the hassle. The insulation you choose will be highly dependent on your budget.