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

Sealing up gaps in OSB exterior sheathing before insulating stud cavities?

Nicholas C | Posted in Green Building Techniques on

My OSB sheathing on the exterior side of my exterior walls has many a gaps varrying from 1/8″ to 1/4″ as the proper installation instructions require the sheathing to be gapped with a nail to allow expansion due to humidity changes.

So…I’m looking at these gaps (some rather large) and getting ready to stuff mineral wool in. Should I take any time now to a.) caulk or b.) spray foam these gaps? I have a decent house wrap over the sheathing of course but that doesn’t stop everything.

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

    Nicholas,
    Most energy-conscious builders tape the seams of OSB or plywood sheathing. The idea is to use the sheathing layer as your exterior air barrier. For more information on this issue, see these three articles:

    Airtight Wall and Roof Sheathing

    Questions and Answers About Air Barriers

    Return to the Backyard Tape Test

Log in or create an account to post an answer.

Community

Recent Questions and Replies

  • |
  • |
  • |
  • |