This Is One Of The Many Ways To Insulate A Basement

So let's dive in and see how it is done.

As you will see in the video this insulation goes up pretty quick.

On thing the video ignores is what if the concrete wall is out of plumb or not straight. This condition can be corrected at the time you add the second layer of vertical 1×4's . You need a straight reference line at the bottom. tie a string along the bottom, find the furthest out point, and adjust the string on the nails at each end so that it just touches the high point. Next you need to check to see if the wall is leaning in at the top anywhere. Use a level and straight edge or plumb bob, you want to know whether in is plumb relative to the string line you just set up.. If it is leaning in Adjust the string so that plumb to  the top 1×4 to the string an the bottom is plumb. If it is leaning the other way we will add shims to make the 1×4 plumb.

Now you should have the perfect reference string line an the bottom and its time to start nailing on that second layer of 1×4's. You will need some cedar shingle shims to put between the 1x4s. Start at your bottom reference line. shim the 1×4 to the line and nail it. then shim it at the top so that it is plumb and nail the top. Next put a straight edge on the 1×4 and shim it to the straight edge an the other nailing points and nail it. You now have a perfectly plumb stud in the plane of a perfectly straight wall. Carry on and do the same for the rest of the vertical 1×4,s.

Just be aware that foam insulation needs to be covered by drywall so that in a fire it can't burn and give off toxic fumes. So when insulating the joist space above the wall it is better to use fiberglass bats.

Watch the video to get the rest of the tips and tricks for this method of insulating a basement wall.