Polyisocyanurate Insulationin In Attic

I will need 8 of polyiso to meet my disired r value r 48 while keeping the 2x4 rafter bays wide open for.

Polyisocyanurate insulationin in attic.

Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. Attics and cathedral vaulted ceilings johns manville aptmfoil faced insulation sheathing board is an excellent choice for insulating attics and cathedral vaulted ceilings. Step 4 frame in cement. Step 1 cut with a utility knife.

Polyiso is most commonly used as a continuous insulation for roofs and walls and as a protective roof cover board. Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. If you need to cut sheets of how the polyisocyanurate insulation you should use a utility knife rather than a. Can be used in residential construction as insulated sheathing in above grade exterior walls above and below grade interior walls crawl spaces attic and cathedral ceilings as well as type i iv commercial applications.

After reading some info on the green building advisor i am wondering if i would achieve the best insulation value by using poly iso boards. Use a chalk line or t square to mark where it needs to be cut. The value ranges between 5 6 and 7 7 per inch. How do you install rigid foam board.

My joist depth is 8 inches so my ability to get a high r value using cellulose is nil and. The attics are about as simple as can be with no dormers or other obstructions. You can use a utility knife to cut using the same cut and snap process you use with drywall. Polyiso provides one of the highest r values per inch of any rigid insulation r 6 at 1 inch.

I am back again with another question. This is an even more dense and more expensive foam board insulation. It provides an r value of 6 per inch of thickness and often comes foil faced to help reflect radiant heat. As a spray foam alternative i m considering using continuous rigid foam along the 32ft long x 7ft slope in my side attic and just spray foaming in the lower joist bays and places where taping is difficult.

A table saw will also cut the board but it. Polyisocyanurate sips on the other hand have the highest r value per inch of any type of insulation of its thickness. Polyiso is a versatile high performance insulation solution that is suitable for a multitude of applications. How to use polyisocyanurate insulation.

One common use of extruded polystyrene foam board is for foundation insulation panels. They come with a built in moisture barrier. Measure the space between rafters and cut the board to fit.