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Old 05-26-2012, 06:35 PM   #1
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glu lam for floor straightening


Hi folks,

My new challenge is to strengthen a floor that has some sag. I hope to make up a bit of the sag, not all of it. It's probably an inch and a quarter too low. I'd be happy to get half of that back - and to ensure it doesn't go down any further.

I hope to accomplish this in the crawl space with screw jacks and extra support beams perpendicular to the floor joists. Had I the space, i'd probably just bolt two 2x10s side by side and have that be my beam. But, my crawl space is very low profile. In sections, as low as 18-19 inches. To work in there I have to do a belly crawl. I don't want to lose access to this area of the crawl space, so a 2x10 is just too big. So, I"m considering steel I-beams, or possibly a glue lam. Glue lam seems to maybe be perfect. I'd still be easy to work with (hammer/nails) but could accomplish as much strength with a lower profile.

What do you guys think? I've heard glu lams aren't made for exterior situations. But, this would be in a crawl space. Advice appreciated.

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Old 05-26-2012, 07:02 PM   #2
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glu lam for floor straightening


What is causing the sag? What is the flooring above the crawl space?

Have you considered simply removing the flooring and replacing or sistering the sagging joists?

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Old 05-26-2012, 07:09 PM   #3
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glu lam for floor straightening


That would be a far better way to do it Mike.
Trying to lift a floor with that little room would be a night mare and near impossible to do.
I know my local codes call for any floor joist closer then 18" of the ground must be pressure treated.
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Old 05-26-2012, 07:42 PM   #4
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glu lam for floor straightening


I've jacked a couple of sagging houses--but never in such a tight crawl space---that would be hell to do--
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Old 05-27-2012, 10:05 AM   #5
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glu lam for floor straightening


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Originally Posted by oh'mike View Post
I've jacked a couple of sagging houses--but never in such a tight crawl space---that would be hell to do--

I've been on jobs where we had to dig to get to the spot under the house, and then dig for footings and jack pad. it is like physical exercise training no doubt and dirty a#$ work.
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Old 06-05-2012, 08:23 PM   #6
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glu lam for floor straightening


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What is causing the sag? What is the flooring above the crawl space?

Have you considered simply removing the flooring and replacing or sistering the sagging joists?
Mike, I have thought of that. I think I have heard of taking out plywood from inside the house, by removing baseboards and making a precision cut around the edge of the room. And then pulling up the plywood from the inside to reveal the crawl. I guess once fully removed, I could also insert some new cement piers easily too.

This might be the longer lasting route to take.

I feel like the hardwood has some life left in it though - and was thus hoping the jack-up would get me another 5-7 years before doing the above method.
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Old 06-05-2012, 08:33 PM   #7
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glu lam for floor straightening


You have you make that call---you can only do what you have a budget for---

Try to balance the cost of a temporary fix and the cost of doing the job once and for all--

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