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<blockquote data-quote="Petras" data-source="post: 478560" data-attributes="member: 216">As long as you go with closed cell you can get rigidity, and vapor barrier with less thickness. Substrate needs to be 60 degrees minimum before you spray, ESPECIALLY if you go with a DIY kit like they sell at menards...&nbsp; I personally would go at least 70.....&nbsp; Reason for the higher importance on the temps with DIY kits is that they are not heated, so if it's cooler out or cooler substrate temp, that lessens the chemical reaction which means you get less expansion....Spray trailers have drum heaters that heat the chemicals individually, and a proportioner with heated hoses that help keep the temp up on the chemical all the way out to the spray gun..Closed cell is great for max insulation and rigidity with less thickness.&nbsp; If you want sound deadening effects, Open cell is your huckleberry.&nbsp; Only problem with open sell is it doesn't insulate as well as closed cell, and takes at least 2x as thick of a layer to make the same vapor barrier as closed cell.</blockquote>

[QUOTE="Petras, post: 478560, member: 216"] As long as you go with closed cell you can get rigidity, and vapor barrier with less thickness. Substrate needs to be 60 degrees minimum before you spray, ESPECIALLY if you go with a DIY kit like they sell at menards... I personally would go at least 70..... Reason for the higher importance on the temps with DIY kits is that they are not heated, so if it's cooler out or cooler substrate temp, that lessens the chemical reaction which means you get less expansion.... Spray trailers have drum heaters that heat the chemicals individually, and a proportioner with heated hoses that help keep the temp up on the chemical all the way out to the spray gun.. Closed cell is great for max insulation and rigidity with less thickness. If you want sound deadening effects, Open cell is your huckleberry. Only problem with open sell is it doesn't insulate as well as closed cell, and takes at least 2x as thick of a layer to make the same vapor barrier as closed cell. [/QUOTE]

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