What's the best underlayment for hardwood flooring on a concrete slab in a New Brunswick basement where moisture is always a concern?

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Accepted Answer

For basement concrete slabs in New Brunswick, you absolutely need a moisture barrier underlayment system — our high water tables, spring thaw, and clay soils make basement moisture management critical.

The best approach is a two-layer system: start with a 6-mil polyethylene vapor barrier directly on the concrete, sealed at seams with acoustic sealant or vapor barrier tape. Over this, install a premium underlayment like Bostik's MVP or similar closed-cell foam with integrated moisture barrier. T

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What's the best underlayment for hardwood flooring on a concrete slab in a New Brunswick basement where moisture is always a concern?