Your customer wants hardwood floors in a basement remodel or over a slab in an urban build-out. You know that for solid hardwood you must install (with loads of glue and a million powder-actuated nails — oh, joy!) a 3/4-inch subfloor to accept cleat nails or staples for solid sawn stock. You might be able to use a manufactured subfloor product in the basement, but that takes a big bite out of the budget; using it elsewhere isn’t practical, because it affects the transitions between rooms. And to top it all off, you don’t want to run a solid sawn hardwood floor over a basement slab because of possible humidity problems.
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