Should I use Tyvek or tar paper on basement walls?
"Should I use Tyvek or tar paper on basement walls?"


Neither. No building paper or wrap against the foundation. Just use foam it is not really all that difficult to cut.

The best practice really is to use rigid foam against the foundation wall, then a framed (possibly insulated) wall with drywall and no vapour barrier.



Batt insulation in the framed wall is debatable. Green Building Advisor has articles that say it's not a good idea because it can absorb moisture, but others sources have no problems with it. If you do use it (I would if you are in a cold climate and don't have existing moisture problems in your basement), I personally prefer mineral wool over fiberglass.



Don't forget about the cavity above the wall in the joist spaces.

Trusted Sources (read them!)


Built Wrong From the Start (Fine Homebuilding) [PDF]
Basement Insulation for all climates (Building Science Corporation) [PDF]
How To Insulate a Basement Wall (Green Building Advisor)


Good Luck!