![]() ![]() The ventilation thing could be right but essentially your building hasn't changed other than swapping plastic for metal top sheet. If so then this might be a possible water ingress point. OR the new metal sheet is fixed through the felt roof to the sarking board and movement in the metal or wind uplift may be pulling the fixing out of the material and breaking the seal between the fixing washer and external metal sheet. However, I assume that the removal of the plastic sheets may have left fixing holes through the felt roof? The issue here is that any condensation should shed off the original felt roof to eaves. This is generally fine on unheated industrial buildings where dampness is not an issue. The issue with uninsulated profile metal is that condensation will form on the underside, this can be an issue in roofs with no substrate below the metal sheets and you can get profiled sheet with a felt backing applied, sometimes referred to as no-con-drop but in reality this isn't preventing condensation, it's just mopping it up. Is it a timber board on rafters, with built-up felt coverings and then profiled metal sheet fixed through this into. (BTW I've tried opening the window to various degrees to try and promote air circulation, but that hasn't made any difference) ![]() Should I insulate (with I guess celotex boards) and/or board out the roof, to stop warm air from the shed condensing on the steel - or try and fit a raised insulated floor? Is it that condensation is forming under the steel and dripping onto and soaking into/through the roof boards then discharging that moisture into the shed? Or is it that moisture coming up from the broken concrete floor used to escape through the somewhat permeable roof but it now trapped by the new weathertight roof? Evidently, there is now a damp atmosphere in there. Unfortunately although it looks great, since the new roof went on I started to notice rust forming on some of my tools - a year or so later, the problem has got really bad with some tools now rusting badly, despite regular attention with wd40. I removed the remaining corrugated plastic and fitted a corrugated steel roof, fixed in exactly the same way, over the surviving felt and fixed using the correct fixings with weatherproof washers, flashings etc. Then I decided to do something about the state of the roof. It has a roof made of timber boards which had been felted and then corrugated plastic at some point fitted on top of the felt.ĭespite the considerable age of the building, the cracks in its concrete floor, and the terrible state of the plastic (bits of it literally falling off) and the roof felt, and that rain very occasionally made it through the plastic, felt and boards, it was dry inside and everything in it stayed in perfect condition. It's pretty substantial for a shed and very old, certainly it's on the plans from long before the house was built (1970s). The shed itself is timber frame clad in thick waney edge, with a concrete base. Hoping someone can give me some clues on how to resolve a damp problem in my tool shed. ![]()
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