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

putting windows in a ICF basement

Posted by touringtaylor (My Page) on
Sat, Sep 17, 11 at 9:40

Hey there I'm just getting my walls up in my basement using the styrofoam ICF blocks and my dad and I keep arguing over how to put the window bucks in. I think I should cut the blocks out and make the buck the width of the wall but we're not sure how to hold it in there meanwhile my dad thinks we should put the buck inside the wall but we're not too sure how to do that either. Any help would be appreciated. Thanks

Follow-Up Postings:

RE: putting windows in a ICF basement

I would suggest a lot more research on the topic. The inet has some details out there to look at. Most block websites will show buck options.
However either option will work. The advantage to the buck on either side of the foam means its slightly easier to attach the window, trim etc. However you have thermal bridging issues. I would recommend putting the buck between the foam, so ripping it to fit tightly. You can drive long screws through the buck and let the ends hang free into the wall cavity. Once the concrete is poured, it will flow around the screws and hold the bucks in place. Prior to the pour, you can screw through the foam to help hold the buck in place. However you must brace the bucks to themselves. Also remember to leave an opening in the lower buck to pour the concrete into the wall below the window.
Again, sounds like you need to do some more research on the topic. Call the block rep as well, they are typically a good resource too. The info is out there, use it to your advantage. You only have 1 chance at an ICF pour, mistakes are very costly.

RE: putting windows in a ICF basement

We did a combination of both ideas. We did a treated plywood full width of the blocks with channels on the inside width of the blocks which held them in place and would have the concrete fill the inner channel. Remember to make an access port on the bottom of the buck to fill concrete better under the window.

RE: putting windows in a ICF basement

You might want to ck out the ICF forum at the

 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 Building a Home 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