What is the minimum pitch for a polycarbonate roof?
A. It is good practice to work to a minimum pitch of 10°, especially for long slopes. Lower angles are possible with some sheet products and systems e.g. 5° which still allows adequate rain water run off. Some glazing systems will accommodate angles down as low as 2.5°, on such very low pitches sufficient flashing or sealants should be used to waterproof the top junction of the roof. Also consider a more frequent cleaning regime to remove any dirt left by ponding water. Always ensure the flutes of multiwall polycarbonate sheets run down the slope direction on pitched roofs, or vertically when used for external glazing to allow drainage of any moisture.
