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If the subfloor is plywood no other ply is necessary; but you do need a flat surface for the Ditra. If the subfloor cannot either be scraped, chiseled, or sanded flat then self leveling compound may be required. If you use self leveling compound remember that the surface should be primed first - follow the product's prep recommendations. 1/8" plywood, in ...


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 ...

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