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Typical requirement for US building codes is l/360 live load deflection limit. So it is not quite accurate to classify this as a correction if the design deflection is l/337. If the finish material requires a stiffer floor, then a structural change is required for aesthetics and or performance, but not for structural safety. Structural modifications will ...


-Is fan fold insulation an acceptable underlayment for hardwood? As a complete underlayment for snap-lock flooring, yes but I'd be more comfortable using rolls similar to what the manufacturers specify. Hardwood flooring installed traditionally with nails is to be installed directly on the subfloor. (Rosin paper is optional) -But it is being used as a ...

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