Zone 6 (Maine)
1. Foundation – I’ve specified 2″ XPS foam board on the exterior foundation wall. There’s also a perimeter drain. Should the foundation have a waterproofed coating applied before the XPS board is applied? Can you recommend a type/kind of WP coating?
2. Slab – I’ve specified 2″ XPS foam board, 6 mil vapor barrier and rebar stanoff’s/WWM. Gravel is specified under the slab. Is this 3/4″ gravel? Note. Contractors use a lot of gravel fill with dirt mix. It compacts (dense) well but believe it can hold moisture. Radon mitigation system is planned so 3/4″ gravel is preferred?.
Replies
Full basement, crawl space or slab on ground?
What's the surrounding terrain like?
Rain gutters in the plan? Do NOT connect them to the foundation drain(s).
The WWF used in the slab will probably be better supported by #4s on chairs (24" c/c) with the mesh on top of the bars. Ever watch a placing crew do a slab? It ain't pretty when they're walking all over the WWF.
Full Basement, Clay about 18" down, No gutters (stone will be placed under the eaves with edging and concrete FDN well above grade (splash/snow)). Yes, SOW specifies chairs. It up to them to use WWM or rebar, Waterproofing FDN before XPS?