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Old 02-08-2014, 04:07 PM   #1
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Insulate steel beam

Live in northeast ohio. Bedroom above garage. 2 steel beams run the width of the garage to help support the bedroom above. The beam closest to the garage door is covered with t1-11, and insulation(house wrap..Tyvex?). The interior side of the beam is exposed. Should I insulate this side? Would moisture form on the beam if it is covered with rigid foam?

Thanks for the help.


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Old 02-08-2014, 04:19 PM   #2
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Insulate steel beam

Got a picture?


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Old 02-09-2014, 09:34 AM   #3
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Insulate steel beam

Picture is going to help here.

Steel will likely get colder if insulated but if the insulation is air tight, it will be less likely to form condensate.
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Old 02-09-2014, 04:33 PM   #4
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Insulate steel beam

IMO, if insulated/wood wrapped, the steel will get warmer as it will be keeping more heat from the house (through joist conduction) without garage/outside air wind-washing them, contributing to the heat loss.

The joist bottoms should be covered with 5/8" Type X drywall/taped or similar per code minimum, check local AHJ.

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