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Wood Supporting Concrete
3

Wood Supporting Concrete

Wood Supporting Concrete

(OP)
This subject has been discussed here before, probably beating a dead horse.  Nevertheless...

Have a possible project where the client wants to build an earth home on a rock bench.  He wants to use PT planks for the roof with sod over, all supported by Glulam Beams.  I believe the code states that concrete cannot be supported by wood except under certain situations, such as lateral, but I am wondering on the logic here.

Asside from the huge size of beam that would be required, I am wondering if the problem is inherently in the wood to concrete contact, which could be alleviated with a metal cover bracket between the two.  

Any thoughts here?

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

RE: Wood Supporting Concrete

I don't feel comfortable with wood supporting concrete, but it is done in some places.  I have seen three story walk-up apartments framed with concrete slab floors supported on wood studs.

I don't know what your code states, but our code permits concrete to be supported on wood provided the fire rating is adequate for the occupancy affected.

BA

RE: Wood Supporting Concrete

I think the latest IBC allows that - not sure.  But BOCA outlawed it based on the theory that fire would burn the wood supporting element and allow the concrete to fail.  That's what I was told.

Both codes allowed lintels to be installed on wood members and  support brick.  What's the diff??

I just haven't had much reason to violate the rule - if it is still in the code.

RE: Wood Supporting Concrete

(OP)
Hmmm.  OK.  Well the idea is still creepy to me anyway.   

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

RE: Wood Supporting Concrete

I agree it is not a great idea.  I designed some precast slabs that sat on a timber wood frame that I did not design.  I finally gave up arguing and designed my part.  I'll never understand some people's idea where they think they need to save $$.

Brad

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