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

Ice & Water Shield over OSB

John P.| Posted inGreen Building Techniqueson

I’m going to be putting Ice+Water shield over a barn I’m insulating on the outside. The OSB is gapped (1/8″). Will the gaps pose a problem for the water shield? These gaps will be visible on the interior for at least a year. Should I use a flashing tape first (like 3M’s All Weather Flashing) on the seams first, before covering the siding? Grace (and other mfg’s) of the peel and stick warn you not to have it exposed to living spaces. I’m also concerned that the Ice+Water will not be tough enough to span the largest of the 1/8″ gaps.

Thanks!

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

    John,
    Is this a barn (shelter for farm animals) or a building that will be occupied by humans?

    I'm fairly confident that the Ice & Water Shield will be able to bridge the gaps without any problems.

    If you (or other humans) will be living in the barn, and you are worried that the adhesive on the Ice & Water Shield will outgas, I suppose that installing the 3M flashing tape would make sense (especially if you or your family members have issues with chemical sensitivity).

  2. John P.||#2

    It will be a wood workshop (and upstairs home office space). As for chemical sensitivity - no, but the precautions on these types of products mention "do not install where this product will be exposed to living spaces" - I'm not too sure if that is due to odor, or voc's (or both) escaping from the product as it ages. I know there are concerns with OSB as well, so the surface area of exposed Ice & Water Shield will be far below that of the OSB and perhaps I'm worrying over nothing.

  3. Charlie Sullivan||#3

    If your only goal is to block outgassing, you could probably get away with something a lot cheaper than 3M flashing tape. Al foil is particularly good at blocking vapors, although the cheap versions of Al foil tape are not particularly robust, so it wouldn't do much to address that concern. But I am not worried about the toughness of Ice and Water Shield for those gaps.

  4. John P.||#4

    Thanks! I'll do some tests this weekend.

Log in or create an account to post an answer.

Community

Recent Questions and Replies

  • |
  • |
  • |
  • |