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The washers are easy to fix and have been specially designed for use with our tile backer screws in three specific ways.
The discs have a counter sunk mid-section to allow the screw head to pull into the board but the outer rim of the disc to remain flush with the board surface. This is to maintain the flat board surface ready for easy unhindered application of the subsequent layers.
The discs have a perforated surface to maintain maximum board surface exposure as standard adhesives and plasters are not designed to be fixed to flat plastic or metal surfaces. By perforating the fixing disk this allows the adhesive or plaster to adhere to the board surface minimizing the risk of surface delamination or damage.