Return to the Home Repair Forum | Post a Follow-Up

Gap behind house siding

Posted by outermarker (My Page) on
Sat, May 8, 10 at 20:17

Hello, we recently purchased a home just north of Atlanta that is about 15 years old. The home had the foam around the foundation which the previous owner removed because of the possible termite issues. I noticed today that due to the removal of the foam, I can put my fingers up underneath the siding pretty far in some places. I think this might be a reason why we have so many bugs in the house. I was planning on using expanding foam and then topping it off with caulking to waterproof it a little. But I was wondering, is it better to just stop at the foam? Does the house need the foam behind the siding to "breath" or get rid of moisture? Or any other suggestions on what I should do with this gap? Thanks for your help!

Follow-Up Postings:

RE: Gap behind house siding

What kind of siding?

What else is under the siding?

Siding is not waterproof by itself, but there should be another layer of something (possibly even tar paper) that is the actual drainage plane behind the siding.

If you seal the bottom of the siding any water that penetrates will not be able to drain.
This can result in damage to the siding itself (if it is wood) or the structure (if the water gets past the drainage plane and into the framing).

RE: Gap behind house siding

Like brickeye asked..whats behind the siding?
is the siding vinyl?

Houses don't need to 'breathe', most are not tight
enough. Very few achieve a level of tightness that
is problematic for the homeowner. When a house does
achieve this low air change exchange rate, fresh air
can be added as long as it is filtered and dehumidified
before entering the house.

In our location (hot humid climate) houses dry to
the interior, foam behind siding is actually a good
thing as it will stop air flow (if installed properly)
and provide a thermal break at the studs.

But foam next to the ground is a termite interstate.
(got that from Joe @ building science.)

best of luck.

RE: Gap behind house siding

I think that the house should not be too tight so that it will have a good ventilation.

 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Home Repair Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here