Re: The Journey Visvi 1999 Thomas MVP ER
Heís asking (I think) about sheet metal buckling due to the heat generated by the foam curing. It gets pretty hot for a few minutes and the heat can warp thinner sheet metals.
My walls are eighth-inch-thick aluminum and they didnít warp or bend in any way. I also didnít notice any warping on the .040 ceiling aluminum, but most of the area I foamed is underneath the roof deck, so I wouldnít notice it anyway.[/quote]
Bus Conversion Magazine did an article on spray foam insulation. Per the article, because of the heat being generated, excesses of 150 degrees, flat metal may distort. If it is restrained because it is attached to frames or ribs, it will buckle, or oil can, this will make our bus look funny. The curved roof skin will not deform because of the inherent stiffening of the curvature. They recommend applying atleast Ĺ inch foam board to shield the outside skin, and spraying the over the board.[/quote]
Is this because of chemical reaction when applying or from the heat generated from the sun & radiated back into the metal?