Flat rooflight sealing

[Eldad]

Hi,

 

My builders have installed a cheap flat rooflight on my garden studio (see attached photo).

Roof is made of steel beams+OSB+epdm. It is flat with ~1 degree slope.

I have started seeing some leaks in the inner part of the rooflight (see another photo).

Questions:

1. Is this a valid use for such a rooflight? or should I gotten an upstand for the rooflight?

2. How do I seal the window? I think I need something that covers the edges of the window and onto the epdm.

 

I am no longer in connection with the buulders as they have never completed the job so I cannot contact them to fix it.

[elite]

Yes I would want an upstand, EPDM should be lapped up the upstand and then flashing applied on top

[Redbeard]

+1 it needs an upstand. If the existing won't let itself be 'popped up' to achieve this I would make one. I did exactly this on my (OK, pitched-roof) shed 14-15 years ago, using mainly (ughh!) Flashband, and it is still fine. We used a triple-glazed unit which had been made to the wrong size.

[Eldad]

thanks. I'll look into getting an upstand or replacing the window alltogether.

Anything I can do to seal it temporarly until I resolved this with a permamnt solution?

[Spinny]

Not sure what they have installed there - it doesn't seem to have a properly sealed edge on the top side - almost looks like a part finished double glazed window pane. Did they say which company supplied it - I guess not ?

Maybe get a new one from a rooflight company with a matching insulated upstand to fit your opening size. You can get opening ones at greater cost of course. Pay by credit card just in case.

 

As a temporary measure you could seal it with some heavy polythene taped around the glass window and then around onto the roof on the outside. You would just need to check what tapes will adhere but then also be removeable without leaving a residue on the roof afterwards. Tapes can come loose and need replacing over time, depends whether you want to overwinter and fit a new one next spring or replace before winter cometh.

 

Or fix some multiwall polycarbonate sheet over the top and seal the edge with tape or a removeable mastic. I guess if you will get a new rooflight you could even screw into the perimeter of the existing 'rooflight' knowing you will be binning it later.

https://www.diy.com/departments/ariel-clear-polycarbonate-multiwall-roofing-sheet-l-1-22m-w-1220mm-t-4mm/35461_BQ.prd

 

I used proplex as a temporary capping/fascia on my roof but found it had to be well screwed down to survive winter winds.

[elite]

CT1 or some similar sealant on the outside where the glass meets the rubber? But will only ever be a temporary fix

[Spinny]

My temporary, temporary cover while waiting for the roofer to return to dress a vent pipe opening.

[Eldad]

Thank you for all the info... And the temporary aluminum cover 😀

I have decided to get a new window as this window is low quality. I planned to add uv film to help with thermal insulation but now with the upstand,  and leak, i think it will be better to replace the window all together