S. Weaver

04:57AM | 01/06/04
Member Since: 01/05/04
1 lifetime posts
In our new home (new to us) the garage is detached with a conventional roof system. Their is no ceiling, just the exposed joists. I would like to install plywood sheathing onto the joists so that we can store our miscellaneous extras up there, but first need to fix the problems with the joists.

The joists are 2x8s spaced every 48". The span is 22' with no support in the center. The rafter system is spaced on 24" centers. The existing joists are sagging significantly in the center with no additional load on them other than the roofing system. I expect that I will need to at least add additional 2x8s to re-space them on 24" centers, but would this be sufficient? The previous house that I lived in had 2x8s doubled up with 1/4" steel flat bar sandwiched in between to span the garage. Would this be the more appropriate solution?

Please advise any help will be appreciated.



08:42AM | 01/15/05
Member Since: 01/14/05
1 lifetime posts
S. Weaver, have you reveived a 'how to' response to your request as I have the same issue with my garage and would be very interested in the reply?



02:32PM | 01/16/05
Member Since: 11/06/02
1280 lifetime posts
both of you -

A 22' span cannot be handled with normal 2x8 solid lumber for a storage load on it. The flitch plates mentioend would eb very expensive and hard to build in. 2x12 LVLs would handle it but there again the dollars are going to be high.

It sounds like the mention of the roof laods making the existing joists sag makles me think that the roof rafters aer undersized for that load and are transferring some of the roof laod to these undersized joists.

The best solution to begin with in new construction would probably have been roof trusses designed for a storage load contained within.

At the very leat, i would change the joist layout to 2x12 @ 16" OC, with the understanding that this would still sag under a storage load, and could still fail entirely under the combined load of roof. wind, snow, and storage items, burt it would still be better than the laughable system in oplace now.

Excellence is its own reward!

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