Volume Estimator: Cubic Yards vs Bags for Hardwood

Solid hardwood consists of a single 3/4-inch piece of solid lumber that can be refinished 5 to 7 times and lasts 100+ years, but it cannot be installed over concrete slabs or below-grade basements due to moisture swelling. Engineered hardwood features a real wood veneer (2mm–6mm) bonded over high-density cross-ply plywood; it is 100% dimensionally stable over concrete and radiant heat, costs $5 to $12/sq ft, and can be refinished 1 to 4 times.

Cross-section comparison of solid oak hardwood plank next to multi-ply engineered hardwood plank

Published 2026-03-01 · Updated 2026-03-01 · 10 min read

Technical Construction and Dimensional Stability

Solid wood expands across its grain with seasonal humidity, leading to cupping in humid summers and gapping in dry winters. Engineered wood uses 7 to 11 alternating grain ply layers that cancel out wood movement, making it resistant to warping.

Worked Example: Flooring Choice for a 1,500 Sq Ft Single-Story Slab Home

Choosing between solid oak and engineered oak over a concrete slab foundation.

Choosing engineered hardwood over concrete saves $6,750 and eliminates subfloor height elevation issues with exterior doors.

How thick of a wear layer is needed on engineered hardwood to refinish it?

A wear layer of 3mm allows 1 to 2 sandings; a heavy 4mm to 6mm sawn wear layer can be sanded 3 to 4 times, matching solid wood durability.

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