Foam Board Insulation Under Roof

Rigid foam board is just above the roof deck or an exterior insulation option.

Foam board insulation under roof.

It typically has 3 variations. 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. Rigid foam insulation also known as insulating boards provide high r values. Although the r value isn t huge the rigid foam insulation boards do a nice job of keeping the searing heat of the roof from making its way into the sanctified space of the man cave.

This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses. It provides an r value of 4 per inch of thickness and is the cheapest type of foam board insulation. You can even place it under the foundation slab. The article states that if some insulation is above sheathing foam board and some insulation is below something breathable then the insulation underneath should be attached directly to the roof sheathing.

Bare foam board one sided sheathing board or double sided which is also reference as structural insulated panels. Provides high r value per inch in built up modified bitumen metal roof and single ply roof systems and utilizes an environmentally compliant blowing agent that provides high thermal insulation performance. Closed cell polyisocyanurate foam core. Install it anywhere from the roof to the foundation.

The previous four options are all used beneath the roof. Eps is used under roofing over foundation walls and beneath siding. Ul class a combustible wood deck approvals. Between the flat roof insulation and our install of reach radiant barrier insulation on our garage door the shop is now downright comfortable even in the warmer months.

The foil insulation goes on top of the moisture barrier followed by the roof covering. Rigid insulation is one of the best tools to reduce your energy costs.