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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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Old 02-09-2014, 09:34 AM   #3
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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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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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