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Old 03-06-2009, 03:45 PM   #1
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laminated beam outside?


I need to replace a wooden beam (approx 20') along the underside of my camp - center support for 2x8 floor joists - it's a 20x20 building on peirs.

The beam rests on piers (both ends and @ 10' center)

I want to renovate this space at some point and I think the structure needs to be beefed up a bit - mid point - to address the rather "bouncy" floor.

Question:

- can I use a laminated beam for this (currently it's a solid spruce cut and squared from the back lot - but I don't have anything there anymore that's big enough for this job) - I'm not sure if the laminated beam will stand up to the elements (in the crawl space under the camp - there is no skirting around this area so it's open to wind, moisture, etc) - is this an option?

thanks

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Old 03-06-2009, 04:59 PM   #2
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laminated beam outside?


i know you can get treated lam beams

http://www.anthonyforest.com/treatedbeams.shtml

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Old 03-06-2009, 05:35 PM   #3
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laminated beam outside?


Quote:
The beam rests on piers (both ends and @ 10' center)
Ayuh,...
As long as the present beam isn't Rotten,...
It would make more sense to add Support Piers to fix your Issue....
2 more supports 1/2 way between what's there is a Big increase in square inches of load bearing foundation...
'ell of alot Less Work too....
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Old 03-09-2009, 02:34 PM   #4
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laminated beam outside?


Quote:
Originally Posted by Bondo View Post
It would make more sense to add Support Piers to fix your Issue....
2 more supports 1/2 way between what's there is a Big increase in square inches of load bearing foundation...
'ell of alot Less Work too....
I hear you - but where I am it's a really ugly mess to dig down especially in the rather tight crawl area under there. The existing piers were dug down a couple feet, concrete base on the bottom, blocks on top - if I add piers on the surface it would be pretty easy as you say - but I think the frost might push them around a bit more though....?

Guess I got a lot of work either way
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Old 03-10-2009, 03:18 PM   #5
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laminated beam outside?


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but I think the frost might push them around a bit more though....?
Ayuh,... I really Doubt you'll see Frost Under a heated building....
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Old 03-10-2009, 03:33 PM   #6
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laminated beam outside?


Since it is an unheated crawlspace (and unskirted for that matter), frost footings would in fact be required.

No, I wouldn't advocate installing an untreated beam down there. Even if it won't get direct rainwater on it the humidity and dampness won't do it any good, long term.

PSL beams are available treated. They're a special order item and you probably won't find them on the shelf at your local lumberyard.

There's always the option of using a built up beam of treated 2x10's or 2x12's.....
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Old 03-10-2009, 06:35 PM   #7
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laminated beam outside?


My vote would be add additional piers!

Start digging a trench on the outside to allow digging room! Dig down to the required depth of the footing, then dig your way in until you reach midspan. Pour the footing and build the pier, using cement blocks!
Fill it back in and do the other end.
Keep in mind, you would have to put in temporary support, if the original beam is removed!

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