New shed condensation

[DIY_Doctor]

Did you do a felt roof on the new one? Since the very cold snap the felt on mine has wrinkled, i guess because Expansion of the osb roof and no elasticity in the felt, so it hasn't shrunk back flat

No I didn't want to risk any leaks doing a DIY job with the blow-torch (and the previous one was felt which failed prematurely but I suspect the roofer was a cowboy). Used a single piece of EPDM roofing this time. No problems with the cold snap thus far.

 

[robby71]

I noticed this winter our shed has had condensation dripping from the roof inside (wooden roof with felt).
I was thinking of fixing some Kingspan to the underside as that has kept the garage warmer and condensation free (from the roof)

 

[JohnD]

I noticed this winter our shed has had condensation dripping from the roof inside (wooden roof with felt).
I was thinking of fixing some Kingspan to the underside as that has kept the garage warmer and condensation free (from the roof)

Is the water vapour coming from the floor?

 

[robby71]

Is the water vapour coming from the floor?

No, you can see it dripping from the roof

 

[JohnD]

No, you can see it dripping from the roof

That's where the condensation comes from (unless you mean the roof leaks)

But where does the water vapour come from?

 

[robby71]

I'm not sure?
I noticed some wet drips on the shelf tops and thought the roof was leaking, however it isn't but i can see some drips and feel the wetness on the inside of the roof. The thin single glass window (bonded to outside) has been frozen with the cold

 

[JohnD]

Let me put it another way

Does it have, for example, a concrete floor in contact with the damp earth, and no dpm?

Or gutters and downpipes that dribble down the walls?

 

[robby71]

Let me put it another way

Does it have, for example, a concrete floor in contact with the damp earth, and no dpm?

Or gutters and downpipes that dribble down the walls?

The wooden floor is raised off the ground by a few inches (soil underneath), never had any damp in the lower part of the shed (floor/ walls)

It has a sloping roof which overhangs onto nothing so no gutters

The drips are all over the inside of the roof - at the lower/ highest and central points - no screws or nails poking through for the water to make its way through