I want to use my loft for storage and have read the tips on these forums for boarding it. I need to know what to use to prevent dust etc from falling from the slates as there is no roofing felt between the battens and slates (1930's semi). I was thinking of using visqueen plastic sheeting but I'm concerned about condensation. Has anyone got any solutions that don't require re-roofing the house. Thanks in advance.