Increasing the Strength of Ceiling Joists by Adding Timbers on Top?

Postby Andybambi » Wed Jun 04, 2014 12:17 pm


I am in the process of buying a house and will be looking at converting the attic to a storage/playroom but think I will have to re-enforce the ceiling joist to handle the weight. I understand that this can be done by sistering the joists but was wondering if I could simply increase the depth of the joists? For example, if the joists are 2x5 could I not glue and bolt a 2x3 length of timber on top of it effectively transforming it into a 2x8.

Any advice you can provide will be greatly appreciated.

Rank: Apprentice
Progress to next rank:
Posts: 8
Joined: Thu May 29, 2014 12:34 pm


Simply Build It

Postby collectors » Fri Jun 06, 2014 3:07 pm

Not in any way that would be economical. You would end up having to run metal plates down either side of each joist & it would not be worth it. You should also make sure you get graded timber for this sort of work.
Rank: Foreman
Progress to next rank:
Posts: 247
Joined: Mon Dec 01, 2008 7:26 am

Display posts from previous
Sort by
Order by

  • DIY How to Project Guides

  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!


  • Related Topics