JFoy
Silver Member
I am having a metal building erected that will be turned into an apartment. We are climate zone 3 so insulation under the slab is not required but I still want to put 1in foam board down under the slab. The foam board I have bought has foil on one side.
The question is whether or not the plastic sheeting goes above or below the foam board. Arguments both ways.
Sheeting above: Lower chance of underside moisture coming into contact with the slab.
Sheeting below: Insulation stays drier.
Any thoughts?
Thanks,
JFoy
The question is whether or not the plastic sheeting goes above or below the foam board. Arguments both ways.
Sheeting above: Lower chance of underside moisture coming into contact with the slab.
Sheeting below: Insulation stays drier.
Any thoughts?
Thanks,
JFoy