Replies

1. 
   Malcolm_Taylor | Mar 04, 2024 02:21pm | #1

   jeuteneier,

   The nails and flange are sweating because the warm interior air is coming in contact with them and condensing. The solution to stop that happening is to use impermeable insulation between them and the interior so the dew point is moved into that insulation, and air can not travel to those metal elements. Foam away.

1. 
   jeuteneier | Mar 04, 2024 05:06pm | #2

   Thanks Malcolm. Glad for the confirmation. I always like to let the rain come and prove my flashing is sound so when I started seeing moisture inside I thought it was a bad flashing job. I might do a thinner round of foam to see if that clears up any moisture then fill in the rest.

   I plan to use the low expanding foam but I also want to make sure I've got complete contact with the metal so there are no exposed pockets. Will the low expanding be "forceful" enough or is the red gap filler better (noting that I have to properly secure the frame to not expand during curing.

1. 
   Malcolm_Taylor | Mar 04, 2024 06:31pm | #3

   jeutenier,

   A two layer approach so you can see the results sounds like a good idea.

   I've never had any problem with low expansion foam not filling voids. Even it puffs up a bit. I find the high expansions stuff too hard to control in small voids.

2. 
   jeuteneier | Mar 04, 2024 07:12pm | #4

   Thanks.

   If I do use higher expansion i plan to secure a strong board (or level) to the frame to control any movement. Excessive I know, but I'm pretty careful that way.

   I'll probably just go low expansion though.

   I'll let you know how it goes.