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Old 08-07-2012, 06:00 PM   #1
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Microlam span question


Hello everyone, i'll try to keep it as concise as i can.

I'm ready to put an offer in on a circa 1960 single story ranch home. The dimensions are 50x27, and the roof is stick built, with 2x8s at a 3/or 4/12 pitch running the length of the house. I am in a heavy snow load area.

Anyway, the present design is typical of the 60s with many small rooms. There is a wall that runs through the center of the house in the long direction, which i strongly assume is load bearing, as there are 4x4 posts scabbed to the ridge and dropping down to the top of the center wall.

I would like to clear span a 22 ft length directly under the ridge, and carry the load to the basement double microlam, and down to footing at the basement floor.

Is this possible to do with any amount of 12 inch or under lams?

thanks

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Old 08-07-2012, 06:13 PM   #2
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Microlam span question


not sure what you are asking .... a sketch would aid

are you removing the ceiling joists and trying to cathedral the roof?

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Old 08-07-2012, 06:19 PM   #3
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Microlam span question


This is a pretty typical design question that comes up a lot on this forum. Unfortunately it is impossible for anyone on this forum to accurately answer the question, as the design requires a site visit to verify loads (distributed and point loads), review of code in your area, and assessment of the support geometry available. It is almost always possible to replace a load bearing wall with a beam of some sort, however determining the exact size of the beam is how structural engineers make a living.
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Old 08-07-2012, 06:20 PM   #4
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Microlam span question


No cathedral, just a clear span. A large one. I dont have the ceiling height to go over 12 inch lams.

Last edited by jmagg; 08-07-2012 at 06:30 PM.
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Old 08-07-2012, 06:51 PM   #5
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Microlam span question


Steel is stronger than a lam. 22' is a long span for anything that a nail can go into.
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Old 08-07-2012, 07:03 PM   #6
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Steel is stronger than a lam. 22' is a long span for anything that a nail can go into.
I'm getting older, I can get it in, but can't press the steel over my head anymore.

Guess i'll redesign to 18ft?
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Old 08-07-2012, 07:27 PM   #7
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Microlam span question


Go rent a Genie Superlift. Bout $30 a day and can lift about 1000 pounds.
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Old 08-07-2012, 08:24 PM   #8
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Go rent a Genie Superlift.
Or three.

Just got a quote for a 3 ply, 20 inch minimum , looks like steel or close it in.
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Old 08-07-2012, 09:06 PM   #9
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Microlam span question


Recess the beam into the ceiling, should be doable, then you can use the (3) 20" lams.
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Old 08-08-2012, 07:55 AM   #10
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Recess the beam into the ceiling, should be doable, then you can use the (3) 20" lams.
And use hangers for ceiling joists?
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Old 08-08-2012, 08:14 AM   #11
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And use hangers for ceiling joists?
Yup, that's what I'd do.
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Old 08-08-2012, 08:51 AM   #12
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Would that meet general buildings code with a 13' 6" CJ span on each side. If so, that would be an option.

Need to size and price steel as opposed to the 3 20s which should be between 5-6 bucks.
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Old 08-08-2012, 09:16 AM   #13
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I won't comment on spans because I don't know all the details, nor do I know your specific local requirements. Even if I did know it all I would not comment on spans because I'm not an engineer.

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