How to Use Rigid Foam Board Insulation

What You'll Need
Ployisocyanurate foam board insulation
Polystyrene foam board insulation
Polyurethane foam board insulation
Staples or screws
Staple gun

Knowing how to use rigid foam board insulation is beneficial because insulation can keep the heat out and prevent damage to pipes.

Step 1 - Knowing the 3 Types of Rigid Foam Board Insulation

There are 3 types of foam board insulation: polystyrene, polyisocyanurate, and polyurethane. Polystyrene is a type of insulation that is uses pressure and high heat to mold its shape. This type of insulation is best used in walls or in attics. This is one of the most expensive types of insulation, but it is strong and durable.

Another type of foam board insulation is the bead board. It is designed to expand to fit areas that are tighter. This is the best type of insulation to use for tight spaces and walls. It is not the type of insulation to use in areas that are exposed to extreme heat or cold, because the temperatures can affect the construction of the overall shape of the board.

The third type of foam board insulation is the polyisocyanurate board. This type of boards are able to survive during extreme temperatures such as cold and heat. This is the best type to use in an attic. It has a moisture barrier and can be made with flame retarder which protects from heat.

Step 2 - Installing Insulation Vertically

First you will measure the length of sheet you need and pre-cut this sheet to that length. Next you will install each sheet, first attaching it at the top of the wall and slowly preceding down the wall. With 1/2 inch staples you will attach the insulation board to the girts. Make sure to leave 12 inches of space in the center. Next you can tape the seams.

Step 3 - Taping the Seams

To tape the seams use ASTRO-FOIL tape. Make sure all surfaces are clean and dry before using the tape. Apply the tape with a flat edge to ensure a tight seal.

Step 4 - Installing Insulation Horizontally

First with a piece of chalk make a straight edge on your wall to where you want the length of your wall. This line should exist 3 inches below the top of your foundation. Next, attach the board at the lower corner. The top edge of insulation should align with the line you drew on the wall. A 3 inch overlap should exist. Now you can unfold the bundle across the right side of the wall. Staple the insulation to the girts and leave 12 inches of space in the center. Continuing doing so until the insulation covers the wall and finish with taping of the seams.

Step 5 - Installing Insulation Over the Roof

Once your trusses are set you can begin installing the insulation. On one side of the roofing begin placing down the insulation sheets to the wood purlins with staples. Continue doing so along the roof making the sheets parallel to one another. Make sure that all of the seams are butted together and tape them so they don't bunch up towards one another.