GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Plus Icon Minus Icon Picture icon Hamburger Icon Close Icon Sorted

Community and Q&A

Tongue-and-groove OSB over 3/4″ foam problem

Tim Brown | Posted in Green Building Techniques on

I’m helping a friend with a basement remodel..
Winnipeg, Manitoba Canada zone 7.
1040 sq/ft basement, concrete walls and floor. no exterior insulation.

We are gluing (PL300) 2.5 inches EPS foam to interior walls. Then 2×4 walls (24″ o/c) with R14 Roxul, no poly then drywall). The wall foam is bonded to the floor foam with spray foam in a can. The corners and seams are all taped. The top will be foamed with a froth pack to seal against rim joists.

Laid 3/4″ foam to floors (is this supposed to be glued to the floor as well (PL300)?
The floor is not perfectly level but pretty good.
The 5/8 t&g OSB is the problem.

When laid on the floor the long sides (4×8 sheets) have t&g and lock together, the short sides don’t and are moving.

How do we prevent this movement on the short sides of the panels?

GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.

Replies

  1. GBA Editor
    Martin Holladay | | #1

    Tim,
    You have two choices:

    1. Fasten the OSB subfloor to the concrete slab (through the rigid foam) with long TapCon fasteners.

    2. Use two layers of tongue-and-groove subflooring (either OSB or plywood), with staggered seams, and screw the two layers of subflooring to each other. This method prevents "potato chipping."

  2. Tim Brown | | #2

    Got it....thanks

Log in or create an account to post an answer.

Community

Recent Questions and Replies

  • |
  • |
  • |
  • |