How to Insulate Garage Walls

What You'll Need
Fiberglass foam
Insulation gun
Staple gun and staples (not the domestic school version)
A metal measure to use as a cutting line
A craft knife
Air vapor plastic sheeting

Garage walls are usually the one place builders don’t adequately insulate when building a house. The little orphan Annie is usually the garage until a home handyman comes along. This is especially true if the garage is detached from the main house.

Once the handyman starts using the garage for his home improvement projects, the garage walls are going to be high on his list of items he must do. Fiberglass foam is the best method to tackle this project. There are several types of vapor seal on the market but some stand out above the rest in that they claim not to break down over the years. It is advisable to look for one that has a long life guarantee.

Step 1 – Preparation

To insulate the garage walls one first needs to prepare the garage all the way round. To do this all the small areas that won’t be covered by the foam need to be addressed. Things like wall studs and window edges and electrical fittings all need to be done separately.

Step 2 – Installing the Air Vapor Plastic around Studs in the Wall

First thing to do is bare the areas around the studs and any fittings on the wall. You are now going to cover these with air vapor plastic sheeting to cut the conducting power of the bare area. Make sure you cover the area so that the paper side faces you. Neaten it up by removing the excess with the craft knife and metal rule. Do the entire garage until all areas that will not be covered in the fiberglass foam are covered.

Step 3 – Cover the Entire Room with the Vapor Seal Now

Remove all the interior wall covering and starting at one end of the garage, staple the vapor seal on to the garage walls. The rolls are fairly large so it should be possible to do the whole wall all the way down. Every foot or so make sure the plastic is stapled into place. When it comes to a point where you are required to start another roll of plastic make certain your insulation is complete by covering the layer you have put on and moving forward again. A nice large overlap should do the job.

Step 4 – Seal the Edges

Once the entire room is sealed, cut around the edges of things like outlets and windows and staple those edges fast. Luckily garage walls seldom have huge amounts of protrusions.

Step 5 – Insert the Foam

The final stage of insulating the garage walls is inserting the foam. Once you have reinstalled the inner wall covering over the film, i'ts time to get the foam gun into action. Make holes around the top of the walls between each stud. Using the foam gun, fill the space to capacity with fiberglass foam. Work your way around the room and repeat the action each time. Once you have completed the circuit, go round again but this time with the sealant gun. Fill the holes you drilled and make them tidy with a metal spatula. Once dry you can paint over it.

Project complete. You now have well insulated garage walls.