Hi ..My bikes live outside in a yardmaster metal shed , but ive noticed of late that the inside of the roof is soaking wet and dripping all over the bikes etc ….. is this just a case of condensation and i`ll have to put up with it ??
There is a small gap between side walls and roof , so i thought that would be enough gap to let the air circulate ?

Yeah condensation. You'd have to insulate to avoid it or get bigger vents I guess.

hi mate , i got the same problem , i was going to make more holes . so more air could get around. maybe add 2 air vents so the air can pass through ( one front 1 rear).

I'm converting a van to a camper at the moment and the van has been soaking for the same reason. If you insulated it, the problem would go away to a certain extent but as it is not getting heated it would never be dry. More ventilation is probably easier to achieve.

i don't know how effective or whether you can get this stuff but this is the stuff we supply preapplied to our products when condesation may be a problem Grafotherm

Metal is a good conducter so will be colder than the ambient temperature in an unheated store so condensation will occur when the air holds water vapour. Extra ventilation may help but is unlikely to stop the problem. Probably your best bet [if possible] would be to fix a waterproof membrane under the roof but not against it, eg a piece of thin plywood with an impermeable plastic sheet stapled to it fixed on battens maybe 6-10mm off the roof [ie roof/gap/damp membrane/plywood]. If the gap could be ventilated and a drainage channel constructed to allow the condensation to run off that would help. Hope your DIY's good!! 😕

Or, like mrmo says, a specialist coating if you can get your hands on it at the right price…

Have exactly the same condnsation thing with an corrugated asbestos garage roof – utter PITA.

mrmo, how on Earth does that Grafotherm work?? It's looks magically AMAZING!

(EDIT: oh wait, it tells you on the website… 😳 Still magic though!)

Had one for ten years and never solved the condensation problem. Tried bigger vents, holes in the floor and even a greenhouse heater.

Just cover up what you can and get used to it or another shed

I had the condensation problem in an old series 2 Landrover, I simply bought some polystyrene tiles from B&Q & stuck then on the underside with silicon, problem solved, I owned it for 18 years & they were still there when I sold it.

I have the same problem with my Yardmaster shed. Apparently the solution is to either build it on a concrete pad that incorporates a vapour barrier and silicone seal the base of the shed to the concrete or, raise the shed off the concrete using timber and exterior ply to give underfloor ventilation. You also need to stick polystyrene tiles to the roof. If you do all these things the problem will be solved (so I'm told).

JonM – Member
I have the same problem with my Yardmaster shed. Apparently the solution is to either build it on a concrete pad that incorporates a vapour barrier and silicone seal the base of the shed to the concrete or, raise the shed off the concrete using timber and exterior ply to give underfloor ventilation. You also need to stick polystyrene tiles to the roof. If you do all these things the problem will be solved (so I'm told).

Mine is on a concrete base with vapour barrier fitted and sealed onto base and still get it ….. have noticed that i dont get the damp in my wooden shed so i may look into changing over to a wood one instead of the metal one ….. thanks for all the replys

Had major condensation problem with my garage roof (corrugated, painted metal). Somedays it was almost raining with condensation inside the damn thing!

Sorted with polystyrene. 50mm thickness was probably overkill, but it worked.

when you say wood, i assume you mean wood on wood, having seen what happens to Steel on Wood purlins not a good combination.