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I will be using a Parex render on moisture resistant backer board (weight 27kg per 8x4 sheet). I have conflicting advice telling me that 25 x 50mm battens will be suitable using stainless steel screws 6.0 x 90mm spaced every 500 mm from timber frame supplier. Parex say 25 x 50mm battens are a minimum and would prefer 38 x 63mm battens using 5.0 x 75mm s/'s screws spaced every 150mm. This would give a fixing of 25mm into the actual timber frame after a 38mm batten and 10mm panel vent board. So the thinner batten has a larger screw with wider spacings and thicker batten shorter screws with less spacing between screws. What have other people used for their battening? Parex say the larger batten is kiln dried and more stable but trying to keep it dry before render is applied will not be easy. TIA
