Leaky Bay window in living room

[enzo808]

During some renovating I realised our bay window has a water leak. Will remove and reapply the silicone sealant on the external sill (where the sill meets the window frame) to try fix this.

Just wondering though, looking at the windows from inside, one of them has some sort of seal/gasket (please see attached).
Hopefully someone out there will know what these are and what they're used for? If needed I can fit some on the missing gaps before the new window board is fitted.
Also if anyone can explain why sealant on the inside of windows is a no-no (atleast that's what my builder said)

Thanks in advance

 

[oldbutnotdead]

Hard to tell what you're looking at there. The gaskets- you referring to the rubber strips on the internal beads? Older DG windows had separate wedge gaskets- you can buy the stuff by the metre on eBay & they'll send you samples (just need to pull a strip out & look at/measure the cross section).
Sealing a leak from inside- your builder is correct, you seal leaks from outside. Once water gets in it'll either flow somewhere or sit still, go stagnant and smell.

 

[enzo808]

Hard to tell what you're looking at there. The gaskets- you referring to the rubber strips on the internal beads? Older DG windows had separate wedge gaskets- you can buy the stuff by the metre on eBay & they'll send you samples (just need to pull a strip out & look at/measure the cross section).
Sealing a leak from inside- your builder is correct, you seal leaks from outside. Once water gets in it'll either flow somewhere or sit still, go stagnant and smell.

I've highlighted it in yellow on one of the pictures. That gasket/piece is missing in between the other windows. Goggled wedge gaskets but that doesn't look the same. It's more like an upside down T shape

 

[oldbutnotdead]

I've highlighted it in yellow on one of the pictures. That gasket/piece is missing in between the other windows. Goggled wedge gaskets but that doesn't look the same. It's more like an upside down T shape

Looks like a pond of silicon put in by the fitters then trimmed. Doesn't appear to be a cill under those windows (not a pvc one anyway), yes starting point will be make sure windows are sealed into the hole from outside. The trim covers on the bay poles look a bit odd as well, as if there's 2 bits glued together