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Old 04-28-2012, 09:12 AM   #1
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Beam construction


Added a hot tub inside a four season room, built on existing deck. Weight of hot tub filled is 1900 lbs. one side of tub sits over 2x8 beam on footings, two extra footings we're poured under deck where other side of tub will be. Two 2x8 where attached together two sit on the pilings. When I look under the deck I noticed that the two 2x8 's attached together aren't even at the top surface that is in contact with the deck above it, does that mean the weight is only on one of the 2x8's? The 2x8's are about 1/4 inch lower than each other

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Old 04-28-2012, 09:16 AM   #2
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Beam construction


Quote:
Originally Posted by Stefieg
Added a hot tub inside a four season room, built on existing deck. Weight of hot tub filled is 1900 lbs. one side of tub sits over 2x8 beam on footings, two extra footings we're poured under deck where other side of tub will be. Two 2x8 where attached together two sit on the pilings. When I look under the deck I noticed that the two 2x8 's attached together aren't even at the top surface that is in contact with the deck above it, does that mean the weight is only on one of the 2x8's? The 2x8's are about 1/4 inch lower than each other
Who designed this for you and did you get.permits and inspections?

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Old 04-28-2012, 09:32 AM   #3
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Beam construction


Permits taken out, electrical inspection completed final building inspection due. Footings poured 48" deep, construction done according to plan drawn up, just concerned about those 2x8's not being even on top. Does strength come from 2x8's being bolted together , is it significant that structure seems to be resting on one os the 2x8's.
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Old 04-28-2012, 09:50 AM   #4
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Beam construction


They shrunk, they were different sizes to begin with, the person assembling it didn't care, etc. Add metal shims under each joist that doesn't contact both sides of the beam for peace of mind.
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Old 04-28-2012, 09:56 AM   #5
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Beam construction


Will put those shims as suggested. On closer look its only on the two ends of the double beam ( about 1foot at each end) total length is 7 ft, that full contact isn't being made with deck above, middle section about 5 foot in length is where the double beam is in full contact. I guess the wood was warped.
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Old 04-28-2012, 10:15 AM   #6
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Beam construction


Assuming the design was correct, and assuming the two 2x8 beams are adequately fastened together to develop required horizontal shear, if one of them is higher than the other, all it means is that direct compression from the hot tub is carried by one beam, not the other. This is pretty common, and is typically not a problem, since direct compression almost never controls design. As long as the two beams are properly fastened, they will act together in bending, which is likely the controlling property. You can use shims if it makes you feel better, will not hurt anything.

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