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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 ...


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I believe the point of underlayment in your situation will be controlling moisture movement from below. That is, you want a vapor barrier under the floor. Now, the underlayment can achieve other things as well, such as providing a "loose" surface for a floating floor (as discussed by @DMoore), or enhance sound deadening. I read your post and comments, ...


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I would. I put underlayment for all engineered. I spend about .25 a sq/ft for my high quality rolls so not sure what you are looking at. The point of the underlayment for engineered flooring is to provide a surface for the wood to slide across (wood on wood gets stuck sometimes) and to decrease the noise between hardwood and subfloor. Imagining your ...


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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 ...


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Per the Armstrong subfloors and underlayment manual, all Armstrong vinyl tile installations require an underlayment. If you don't have an approved underlayment, you may not receive full warranty coverage for the tiles. Further, the underlayment is secured using mechanical fasteners through the old tiles to the subfloor, so you don't have to worry about ...



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