Help Sizing LVL Beam/Header

Old 03-02-09, 12:50 PM
Thread Starter
Join Date: Aug 2008
Location: USA
Posts: 9
Upvotes: 0
Received 0 Upvotes on 0 Posts
Question Help Sizing LVL Beam/Header

I would like to create a 12'-6" opening in an interior load bearing wall in my basement and I need some help sizing the beam/header. The distance on one side is 12' and the other side is 7' which gives me a total tributary width of 9'. The floor joists supported by the wall are continuous over the wall. The space above is a living room with hardwood floors. The house has 2 stories above the basement, but this span is only supporting the one floor above.
I found a demo version of the ConstructionCalc ProBeam Calculator and it just so happens that the demo span it uses is the exact span I need.
According to the ProBeam calculator I can use either (2) 1-3/4" x 11-1/4 or (3) 1-3/4" x 9-1/4" Microllam LVLs . Is this really sufficient and do you think I will have any issues with that weight bearing down on the concrete slab since I'm sure there isn't a footing under there and I really don't want to have to add one.

Old 03-02-09, 03:25 PM
chandler's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Dec 2005
Location: USA
Posts: 36,608
Upvotes: 0
Received 9 Upvotes on 8 Posts
The double 11 7/8 LVL will be sufficient for that span. You can't support the house on a concrete slab. A footing will need to be hammered out and grouted so you can rest your vertical supports on that.
Old 03-03-09, 03:59 PM
Join Date: Aug 2008
Posts: 23
Upvotes: 0
Received 0 Upvotes on 0 Posts
Mind giving a link to the demo of the probeam software?

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: