It will depend on the intention of the product, we made sure to write in the instruction manual. Always refer to the manual for said product before use.Normally, if Tegris is intended to act as a backer; it is preferred to avoid bending it.Do keep in mind that Tegris is resistant to bending, and only hard bends (90-degree angle) can permanently damage it.You shouldn't worry too much about it if it's slightly curved; it didn't lose its structural integrity.