Hi all

I am considering fitting Keylite roof windows, but am wondering if I should go for uPVC or wood frames. The uPCV are more expensive and can (if you pay for it) have a longer warranty. So are they a better frame? 

We've got the PVC frames and they're very good. Obviously they're near-enough maintenance-free, and are clean and bright. You'd need to go digging to confirm, but they're probably a bit better thermally?

We've the PVC as well. Don't see why you would want wood, unless for the look or you wanted a different colour.

Thanks for the replies.

 

I've just found out that the top hung Keylites are only class 3 for airtightness. Don't know how good or bad that is? I got 0.92 for the whole house so don't want comprise on that.

Apparently Velux are class 4 for the equivalent product, but are more expensive. 

are they like-for-like, both with top vents?

And just found out that keylite centre pivot ones are class 2.

Does anyone have the exact definitions of these classes? 

No idea how the numbers work but our PVC centrepivots have pretty complex seals, one wiping, one compressive .