Polyisocyanurate Insulationin In Attic

I have a 2 family balloon constructed house in ma built in 1930 and have looked at several waysto insulate my attic floor.

Polyisocyanurate insulationin in attic. 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. Measure the space between rafters and cut the board to fit. Polyiso is a versatile high performance insulation solution that is suitable for a multitude of applications. I am back again with another question.

Step 1 cut with a utility knife. They come with a built in moisture barrier. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. My joist depth is 8 inches so my ability to get a high r value using cellulose is nil and.

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. The value ranges between 5 6 and 7 7 per inch. This is an even more dense and more expensive foam board insulation. Attics and cathedral vaulted ceilings johns manville aptmfoil faced insulation sheathing board is an excellent choice for insulating attics and cathedral vaulted ceilings.

Polyiso is most commonly used as a continuous insulation for roofs and walls and as a protective roof cover board. A table saw will also cut the board but it. 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. Step 3 always install vapor barrier.

Polyisocyanurate sips on the other hand have the highest r value per inch of any type of insulation of its thickness. How to use polyisocyanurate insulation. 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. Step 2 use adhesive to attach foam boards.

Use a chalk line or t square to mark where it needs to be cut. Step 4 frame in cement. How do you install rigid foam board. I will need 8 of polyiso to meet my disired r value r 48 while keeping the 2x4 rafter bays wide open for.

If you need to cut sheets of how the polyisocyanurate insulation you should use a utility knife rather than a. You can use a utility knife to cut using the same cut and snap process you use with drywall. It provides an r value of 6 per inch of thickness and often comes foil faced to help reflect radiant heat.