Rigid Foam Under Metal Roof

I have a 90 year old stone cottage in portland oregon.

Rigid foam under metal roof.

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. Under consideration is the addition of eps xps or isc under the metal. Place the sheets close together but don t let them overlap. Avoids nails or screws which could penetrate the metal roof and cause leaks.

Foil insulation is a radiant barrier and it works by. Plywood sheathing then roofing felt than 1 5 rigid foam metal roofing. As far as i know standing seam metal roofing can t be installed on rigid foam. According to the manufacturer s instructions install the metal roofing panels over the insulation.

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. I agree to that extent and always recommend a solid deck or some sort of strapping to prevent this. Use duct tape to seal the seams and further protect against moisture air leaks. Install rigid foam insulation over the entire surface of the roof.

Cut each sheet to the desired size using a utility knife then fasten it in place using staples or adhesive. Rigid foam works great and the metal can be installed directly over the top of it. If you want to be sure talk to your roofer or the manufacturer of the roofing panels. I would be interested to hear of the experience of others who have added insulation in this manner.

You just need to be careful not to pull torque the panels when fastening them. Rigid foam boards come in different material compositions varying thicknesses and different insulating r value properties. Will that be a concern with metal roofing. 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.

I am planning to reroof a house in maryland with standing seam metal. I know that most roofs have ventilation under them to prevent overheating of the roofing material. 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.