Tunnel mat as a basement floor drainage plane in CZ5
I am in the process of preparing to finish my old basement in order to utilize it for dry storage. I have gotten most of the design details from contributors here. My questions are:
1.) What is the preferred type of foam and facing to use on the walls that will act as an airtight barrier ?and drainage plane for the leaky stone walls. All types of Used foam is avail here in WNY. What should the vapor permeance of the product and how does that permeance work in the stone foundation wall stackup? Can it be 2 top 3″ of unfaced EPS, or is XPS the best choice?
2.) Would like to not have to excavate for an inside of the foundation wall drain tile and was hoping to use a sealed boat of 3/4″ HDPE tunnel mat to route all wall and floor water flows to airtight sump. Does anyone see a problem with this solution ( attached is a drawing of proposed setup).
Hoping to get an answer so I can get the tunnel mat ordered if needed or should I gird myself for the task of perimeter drain excavation.
All input appreciated
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