Roof window on a low pitch roof

an203888 · 17 May 2020

Hi all. I will be fitting 4x Keylight 780 x 1400 using their double flashing kits (so I will have 2x lots of double windows with no tiles inbetween) onto a 15 degree new build roof, the tiles will be Marley Mendip tiles.
I know that 15 degrees is on the limit for roof windows and have heard some people have issues. What should I be taking particular care of/watching out for to make a good install. Thanks

catlad · 17 May 2020

Do they have felt collars like velux do? if so I would recommend fitting those.

an203888 · 17 May 2020

catlad said:
Do they have felt collars like velux do? if so I would recommend fitting those.

You me a the flashing kit? Or do you mean the extra foam kit that you can buy for velux to stop cold bridging etc? I think keylight windows have this built in with an expanding foam piece.

catlad · 17 May 2020

Velux BFX

an203888 · 17 May 2020

I haven't seen that available for the keylight range. Anything else with the basic installation I should be weary of?

23vc · 17 May 2020

Be very thorough with the underlay and ensure you stick exactly to the instructions eg. Tile coursing, side overhang etc. And double check if you haven’t already, that the collars aren’t available

an203888 · 17 May 2020

23vc said:
Be very thorough with the underlay and ensure you stick exactly to the instructions eg. Tile coursing, side overhang etc. And double check if you haven’t already, that the collars aren’t available

I think they do them - https://www.keyliteroofwindows.com/product-category/accessories/felt-collars/

So I should be getting these with the flashing and windows?

^woody^ · 20 May 2020

They don't make a low pitch surround then?

an203888 · 20 May 2020

^woody^ said:
They don't make a low pitch surround then?

Well they make a seperate collar as above but the standard flashing is designed to be used on 15 degree roofs.
This is a reply I got from them regarding the collar - "Felt Colar is a membrane that creates the seal around the window to ensure the window is water tight.
However this is not an essential part of installation and if the window and flashing is installed correctly, the window will not leak."

Don't know if I should get the collar or not!

datarebal · 20 May 2020

If it's 15 then follow the instructions
It's easy enough

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Roof window on a low pitch roof

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