On May 27, 7:52*pm, RicodJour wrote:
On May 27, 8:16*pm, ransley wrote:



I put foamboard I painted flat black behind single pane to insulate it
in our -20f lows, the sun Melted the foamboard and cracked 2 windows,
Just painting it dark brown reduced heat absorption so it worked. It
was Non Uv glass so I bet the UV cooked it.

Why would you paint the foam board black or any other dark color?
That's guaranteed to heat up and create a lot more thermal stress.

R

Pink boards in a window that say DOW are not much in style. You only
see them on houses where the front door has a big orange oficial
notice of no Tresspass permanently glued on.