Polycarbonate Roof Sheeting

[self builder 123]

Hi

In the roof of a garage we are building we have 6 in number single skinned roof lights.

I would like to try and insulate the roof lights so as to avoid condensation forming on the roof lights and then dripping down on to the floor.

I was thinking about fitting either twin wall or triple wall polycarbonate roof sheeting directly below so as to form a sort of double glazed roof light.

Would this stop the condensation forming ?

 

[badgerchief]

what would be the source of the condensation?
if you are building the garage can you not put double glazed sealed units instead?

 

[self builder 123]

Hi

The garage roof complete with roof lights has already been fitted so I am trying to do something so as to avoid condensation.

When working in the garage water vapour condenses on the underside of the roof lights especially during the winter.

 

[badgerchief]

if it has an apex you could install a vent either end to help ventilation
if you do use the polycarbonate you`d have to seal around it somehow as it`s a garage expanding foam would work if you make up a wooden frame slightly smaller than the poly sheet you might find the condensation will shift to the rest of the roof as the sky lights will be better insulated than the rest of the roof!!!

 

[self builder 123]

Hi

The roof lights are going to be boxed down to the ceiling which will be fitted to the underside of the trusses. The ceiling is then going to be completely insulated with glass wool having being first fitted with a vapour barrier.

Hence the single skinned roof lights are the coldest part of the roof.

 

[badgerchief]

you`ll be snug as a bug