Adding Additonal Joists Use Engineered Wood? - Flooring - DIY Chatroom Home Improvement Forum

 DIY Chatroom Home Improvement Forum Adding additonal joists use engineered wood?
 User Name Remember Me? Password
 Register Blogs Articles Rewards Search Today's Posts Mark Forums Read

 Thread Tools Display Modes
03-25-2012, 04:18 PM   #1
Newbie

Join Date: Mar 2012
Posts: 22
Rewards Points: 10

## Adding additonal joists use engineered wood?

I have a small bathroom that I am adding a corner whirlpool tub. Weighs about 1000 lbs full.

The joist span is 82 inches and currently has 3 joists 27" o.c. (its an old house).

I plan on adding joists in between, but I only have 6.5" available height wise for new joists meaning 2x6's are the largest I can use.

Would I be better off using something like the Boise Versa-lam engineered beams since I cant use 2x10's? Are they significantly stronger then the same size 2x6?

### Advertisement

03-25-2012, 04:49 PM   #2
Civil Engineer

Join Date: Mar 2009
Location: Boston
Posts: 5,471
Rewards Points: 4,522

Step one is to determine the required strength you need, which will depend on the geometry of the load applied to each joist. In this case, you have a combination of a 1000 lb tub plus framing dead load plus live load from humans. This is an unusual case where it is probably necessary to perform mathematical computations to determine the maximum moment on your joists to determine how many extra ones, and of what type, you need.

You have indicated that you can only get 2x6 joists in due to clearance restrictions. However, your span is only about 7 feet, so you may well be able to use 2x6 joists, provided they are appropriately spaced. There is nothing wrong with I joists, however they may not be necessary. Like I say, you have to apply the loads and see what the moment on the joists turns out to be. If you are unable to perform the computations, you may need to get an engineer to do the work for you, or perhaps a contractor or a lumber yard can help. Unfortunately this is a case where you cannot use tables, due to the heavy point load combined with the distributed live and dead load.

### Advertisement

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are Off Pingbacks are Off Refbacks are Off Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Leah Frances Painting 10 08-24-2015 03:59 PM Gecko Flooring 1 02-22-2012 07:35 AM MasonS Flooring 2 12-14-2011 09:59 AM Nando1 Building & Construction 2 05-03-2010 06:11 PM VickyC Flooring 1 03-05-2010 07:50 PM

Top of Page | View New Posts

 Terms of Use

Search Engine Friendly URLs by vBSEO 3.6.1