So I'll be finishing my basement soon and will be using 1.5" pinkboard attached to my interior foundation walls.

What is the best method to fasten this to the wall (construction adhesive, caulk)?

Should the pink board touch the floor? if not how much room should I give myself?

Should it touch the joists?

What should I use to seal the between the boards (caulk, foam, teflon tape)?

Thanks, Joe

1 Answer 1


For attachment, a few options:

  • adhesive. They make adhesive just for this.
  • Powder Actuated Nails with washers. These are fun. You essentially are shooting nails into the concrete. Probably overkill, though.
  • Nothing. One option is to just place them against the wall...maybe hold them with tape, and then just have the interior stud wall hold them against the wall.

Should the pink board touch the floor?

It won't hurt anything.

Should it touch the joists?

Again, it won't hurt anything.

What should I use to seal the between the boards (caulk, foam, teflon tape)?

I've used house wrap tape in the past. Works fine. Another option, price allowing, is to use two thinner layers of foam instead of one thick one and overlap the seams.

You could also leave small gaps between all boards and then come back and fill with expandable foam. That'd give you the most air-tight and insulated envelope.

  • 1
    Just a note about powder actuated nails. I wouldn't use these if you're going into concrete block, brick, limestone, fieldstone, etc - pretty much only poured concrete.
    – Comintern
    Nov 11, 2015 at 3:08
  • @Comintern yes, excellent point. It's essentially a .22 bullet so would definitely shatter brittle materials like block and brick.
    – DA01
    Nov 11, 2015 at 3:26
  • I think the foam board adhesive sounds the best. I may use expandable foam if I have enough space to get the nozzle in the gaps. Otherwise that housewrap tape sounds like a good option.
    – tjcinnamon
    Nov 11, 2015 at 14:14

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