Garage Roof

[Paul Newlove 99]

Hi,
last september i had my old asbestos garage roof taken away. I replaced all the joists and covered with 22mm OSB boards.
Then i fibreglassed as you would.
I fitted a new UPVC window and also a steel security side door. Sorted the lighting and sockets.
I plan to come back to it in the spring but have noticed over winter that i have a condensation problem. The walls are single skin concrete block and the floor concrete. Size 8 ft wide by 18 ft long. The joists have white mould over most of them which is like a light fur. This was particularly bad a few weeks ago when we had very warm weather for February. 17 degrees.
I think the problem might be that i have no air circulation.
I got a local builder in who wanted to kingspan everything, but it's just garage and my budget won't stretch anyway.

Does anyone have any ideas?
Do i just need more air circulation the get the condebsation out?

Thanks

Paul

 

[^woody^]

Ventilation front and back, and paint the underside of the deck with something water resistant such as a good quality fence paint or a preservative. But you won't stop all condensation.

 

[scbk]

Is there currently any vents fitted?

 

[Paul Newlove 99]

No, no ventilation