Perimeter drain and basement finishing
I’m looking to create an insulated room in my basement using Thermax panels on the walls.
The basement has a perimeter drain (see attachment) which uses a dimple mat along the wall which runs from several inches below the floor to about a foot up the wall. This mat captures any water which seeps in through the wall and routes it to the drain. In addition, the upper section of the wall is covered in heavy white plastic which extends down behind the dimple mat. This plastic catches any water which seeps in from higher up on the wall but the installers said that it’s atypical for water to come through the wall much higher than the dimple mat and that the plastic is mostly cosmetic.
I’m considering 3 options for installing the Thermax:
1. Apply the Thermax over the dimple mat and the plastic, from the floor to the ceiling, nailing the Thermax to the foundation walls
2. Remove the plastic and glue the Thermax to the foundation walls from the floor to the ceiling (so again, covering the dimple mat)
3. Remove the plastic and glue the Thermax to the foundation walls from the ceiling to just above the dimple mat.
Any advice would be appreciated.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part