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Old 01-09-2017, 06:14 AM   #1
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Inject metal beams with spray foam for insulation?


I have a solarium that was framed with alumina beams (6 x 9 cm, hollow inside). In very cold
(Canadian ...) nights, humidity will condensate or even freeze from outside to the beams,
but only in some locations. Evidently, the foam insulation which was
manually inserted into the beams during construction is not evenly
spread out or missing in places.
My question: is it a good idea to inject spray foam into the alumina beams
for better insulation, or may that cause problems down the road (like
accumulation of condensed water inside). Any recommendations for
products to be used?

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Old 01-09-2017, 12:20 PM   #2
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Re: Inject metal beams with spray foam for insulation?


While it will help with the airspace, unless the beams are thermally broken from outside, it will still have issues.

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Old 01-09-2017, 08:48 PM   #3
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Re: Inject metal beams with spray foam for insulation?


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Originally Posted by Windows on Wash View Post
While it will help with the airspace, unless the beams are thermally broken from outside, it will still have issues.
Well understood, and thanks for the comment. As this is a slightly heated four-season construction which I keep at low humidity, it is an issue only with certain parts of the frame, fortunately (and windows, doors and glass panels are very efficient). I still remain worried about injecting spray foam into less-insulated parts of the metal structure, as cumulating condensation build-up inside may become an issue - if in fact it does. I have found no clues on the Internet if right or wrong. When using a closed-cell foam it shouldn't pose much of a problem as it is an aluminium structure, but then, maybe you or somebody else has experience with this to tell me don't do it - or don't bother. I sure do not want to experiment too much with an otherwise very pleasing construction.
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Old 01-09-2017, 10:21 PM   #4
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Re: Inject metal beams with spray foam for insulation?


I would use Window and Door, low expansion, foam.
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