Return to the Basements Forum | Post a Follow-Up

ijoists for soffits

Posted by tsand (My Page) on
Sun, Jan 13, 08 at 0:38


Planning on starting a DIY basement remodel. I am planning to do the DIY stuff and and GC'ing the items I don't want to do.

I am planning the insulation and framing phases and I have 2 questions:

1. Has anyone used I-joists (engineered wood joists) to build the HVAC/Plumbing/electrical soffits? It seems it would be way easier than using stick lumber or metal framing. Any details or pictures on how it worked or didn't work would be appreciated

2. Has anyone recently used Foamular or other XPS (Extruded Polystyrene Foam) sheets to insulate their basement? I understand that some local building inspectors don't like XPS glued on the walls? Any details or pictures on how worked or didn't work would be appreciated.

Follow-Up Postings:

RE: ijoists for soffits

I joists are structural. It's way overkill for building bulkheads to hide HVAC etc. It would seem a lot easier to knock together 2x2s or 2x3s.

XPS adhered to the walls is an excellent way to insulate a basement. Adhesive only works well on unit masonry walls, such as block. There are typically too many irregularities in a poured wall for it to hold. In that case, use mechanical systems--such as concrete screws through fender washers. Ideally, seal all joints with tape and use foam where necessary to ensure that as little air as possible is able to circulate between the foam and the foundation wall.

Here is a link that might be useful: Building Basements

 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 Basements 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