Help…. Another day another dilemma 🙄

[junglejim]

So… we survived storm Goretti (just!). With torrential rain and driving winds of 90mph+ it was a pretty extreme test of our build. 
Having got through other storms and downpours unscathed I was uncharacteristically optimistic but… frustratingly 3 or our windows have some water ingress at the bottom corner.

 

The windows are Prestige Sheerline. The cills overhang the cladding well and underneath is dry but the wind has blown hard pushing water into the lower right hand corner. I think my cladding reveal had been too tight to the cill and trapped water as seems quite waterlogged but… around the window I used compriband expandable tape and Tescon vana so should be well sealed. I’m a bit stumped how the water has got in but one possibility is through the end caps of the cill… (edit: on second look I don’t think that’s possible as the cill ends extend beyond the opening.)

 

 one other possibility is that the water is being blown into the drainage area and sloping to the ends… according to prestige this should be sealed with silicone (see attached) and I can see some silicone but there’s no way of telling if it’s failed. I’ve added some manufactures pics but thinking it’s likely to be something I’ve done rather than manufactured but there was a lot of debris blown and washed into the end if the drainage area highlighted on one of the drawings so a lot of water has been pushed this way.

 

i realise that 90mph and torrential rain is extreme but I’m off the opinion that water shouldn’t be able to get in and would like not to have to worry about this in future.

 

 The attached image is from ‘clevett’ video (not mine) but similar to my finished result.

 

 Any tips/suggestions etc greatly appreciated. The stress of self building is definitely showing in my hair colour!!

Edited Sunday at 19:11 by junglejim

[SteamyTea]

4 minutes ago, junglejim said:

i realise that 90mph and torrential rain is extreme

Not that extreme down here.

Are the windows taped in with proper adhesive tape or similar?

[junglejim]

5 minutes ago, SteamyTea said:

Not that extreme down here.

Are the windows taped in with proper adhesive tape or similar?

Yes taped with tescon vana 

[Nestor]

Is the cill part of the actual window frame?

My cills were separate to the window with 10mm upstands at the back and sides. Slotted into a grove within the bottom of the window frame.

The cedar cladding reveal then butted up next to the upstand at the sides with a small gap to allow water to escape.

Photo enclosed, it's bucketing down at the moment.

 

[junglejim]

6 minutes ago, Nestor said:

Is the cill part of the actual window frame?

My cills were separate to the window with 10mm upstands at the back and sides. Slotted into a grove within the bottom of the window frame.

The cedar cladding reveal then butted up next to the upstand at the sides with a small gap to allow water to escape.

Photo enclosed, it's bucketing down at the moment.

 

That looks neat. The cill and frame were fitted together but manufacture details show it as 2 parts. (See attached technical drawings) There’s no upstand though… that’s looks neat but not something on mine.

[Gone West]

12 hours ago, junglejim said:

Any tips/suggestions etc greatly appreciated.

I have had small window leaks in the area shown. When filled with Soudal Fix All Crystal the problem went away.

 

[junglejim]

9 hours ago, Gone West said:

I have had small window leaks in the area shown. When filled with Soudal Fix All Crystal the problem went away.

 

Thank you that’s helpful. Are you pointing to the groove in the window frame? One theory I have is that it’s getting in through the joint between frame and cill as circles in attached. Adding sealant where you suggest could be a solution.

[Gone West]

14 hours ago, junglejim said:

Are you pointing to the groove in the window frame?

My windows are constructed differently, but I think where you have circled the area in yellow, is probably the same.

[BotusBuild]

We have a similar two-part construction on the windows on the S facing wall. Gets a lot of rain and we have a similar small water ingress problem when it blows hard. This is on my list of snags to investigate. I note the "sealant in the corner" suggestion as a possible solution - thank you.