Using Styrofoam For Ceiling Roof Insulation

In warm climates zones 1 through 4 low density open cell spray foam insulation is the typical choice since it is vapor permeable and will allow drying of the exterior sheathing and roof framing if they happen to get wet via diffusion into the interior of the building.

Using styrofoam for ceiling roof insulation.

Styrofoam extruded polystyrene foam insulation sheathings such as styrofoam cavitymate or styrofoam ultra sl insulation provide a coat of continuous insulation over the stud members when properly installed and are treated with durable joint treatments such as great stuff pro gaps cracks or liquidarmor flashing and sealant as an integrated air and water barrier system. Rigid foam insulation also is a smart choice. That styrofoam insulation will work but it is not cheap per r value however it gives you a great r value per inch. Here s what you will need recycled styrofoam foam peanuts or packing material made form styrofoam alot of this stuff its easily found since its thrown away alot.

Settled r values range up to about 6 5 per inch and when installed properly the foam can be a good air and moisture barrier. During hot summer days the attic or the roof tends to get so hot and thus heat up the whole interior of the home. The air space will be continuous down to the soffit vents and. Foam board the last option that i considered and the one i m using is foil faced polyiso insulation board.

Great stuff expanding foam insulation the large gap filler in the black can this can be bought at home improvement stores by the. And should you vent the roof. It is available in all different size configurations to accommodate lots of different applications. This is an even more dense and more expensive foam board insulation.

I m using 2 foam board 2 foil faced polyiso r value is approximately r14 fastened to the bottom of the 2 6 truss chord which leaves a nice 2 1 2 air space. To prevent this foam installation sheets can be installed to provide effective insulation from the heat of the sun. So to answer the two remaining questions. Align the front of the board with the face of the rafter or joist.

Is 2 inches of insulation enough. This instructable is to show you how to insulate your house using recycled styrofoam glued into blocks. One common use of extruded polystyrene foam board is for foundation insulation panels. Leave an air gap between the roof sheathing and the board.

The attic roof or ceiling insulation sheets can be installed in the attic under the roof or the ceiling. This foam board insulation is available with straight or tongue and groove edges to help limit air movement.