Fitting Joists For Loft Conversion - Building & Construction - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction


Thread Tools Display Modes
Old 03-03-2009, 12:31 PM   #1
Join Date: Mar 2009
Posts: 1
Rewards Points: 10

Fitting Joists for loft conversion

hi.i'm thinking about converting my loft into a single the moment i have 4.5x1.5 joists in it.i have a supporting wall thats goes 3/4's of the way across the loft.i'm thinking about sistering the new joist but not sure what size to other problem is that the joists after the supporting are roughly about 24 feet from wall plate to wall plate,i think i'll have problems fitting new joists that length or is there a way i can join them even though there is no supporting wall underneath them.


sparky dave is offline   Reply With Quote
Old 03-03-2009, 03:40 PM   #2
Registered User
Termite's Avatar
Join Date: Apr 2008
Posts: 6,520
Rewards Points: 2,000

You have 1-1/2" x 4-1/2" floor joists spanning how far? Or are we talking ceiling joists here?

If this is a floor, you're waaaaaaaay undersized and need a serious re-design.

As for breaking/splicing the joists out over the span, no. Can't do it. You can certainly break them over the wall, provided it is a bearing wall. Perhaps a header could be added to support them in the area where the wall stops.


Termite is offline   Reply With Quote
Old 03-03-2009, 04:13 PM   #3
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Rewards Points: 2,000

Is it spanning 24' from the inside wall to inside wall?
You don't count the actual wall width, not that it will gain you much
I'd say your are into LVL or I-beams at that distance
I went with I-beams at 19' instead of 2x12's
Scuba_Dave is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Sister or Replace Floor Joists brando1118 Carpentry 25 10-26-2008 08:43 PM
help with 2nd floor joists g heil Building & Construction 5 09-12-2008 06:41 PM
Best subfloor and material thickness nugentcn Flooring 7 09-07-2008 12:48 PM
How to reuse a ABS fitting guide n0c7 Plumbing 4 08-27-2008 05:30 PM
Spacing of ceiling joists Pineconeman Building & Construction 3 05-13-2005 11:16 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1