basement insulation - condensation behind the batt insulation
Thanks for the reply.
I reviewed the link and wanted to note that this is an existing home, built in the 1950's. We placed the rigid board from the concrete floor to the bottom of the ceiling joists, we could not place the rigid board to 'act as draft stop at the top of wall' as shown in the link drawing, as there was no room to place the rigid board into the header. I hope I'm using the correct terminology. We did place batting and then vapour barrier in the headers.
All joints are taped and the top of the rigid board was spray foamed. The walls were dry when we placed the rigid board, however the concrete walls were damp/cool to touch prior to the placement of the insulating boards.
The board is dry until we place the batt insulation, then condensation occurs.
Could it be that the spray foam on the top and bottom of the board is just not perfectly sealing the area. It seams like I should respray the top and bottom of the boards to make sure that they are completely sealed.