No cavity-tray or one been drilled thru by window fitters
sorry to butt in. i need to pick your brains Nige if you dont mind. here goes......
i have a similar problem. ive had new windows installed in the summer and over the past few months ive had water leaching into the plaster in the corner of the sills on the downstairs window and when the wind get right up i get it in the upstairs window directly above, also leaching at the top of the window where the fixing screw goes into the poured concrete.
i do have cavity trays, but only in 2 thirds of the windows which i find bizzare. there is a cavity tray on the downstairs window but not upstairs. they have drilled through the cavity tray twice downstairs (doubt if the siliconed the old holes up) but the fixing screws going through the cavity tray are not rusted. they seem to think its going through the bottom fixing screws when the rain drives past the window seal so siliconed them up.
ive spoke to others in the street with the same houses and they have blocked these up and they have had no problems. is this the right thing to do. even a well knows installer blocked theirs up for them. i got the window installers to block up the downstairs cavity tray a month ago, it worked and stopped the leaching. yesterday with the really bad weather the upstairs one started leaching and the problem came back with the window downstairs, did it come from upstairs window? today they unsealed it as they think its the wrong thing to do.
also when taking the fixing bolt out of the upstairs window the rust on the screw is on the tip where it goes into the concrete, does this mean the concrete is damp and the water is passing through the render and concrete.
the window fitters seem to think the two windows have two different problems. they are steering towards the upstairs leaching through the concrete and want to spray water proofing on the walls above both windows.
sorry for the long winded question
Any help would be much appreciated
thanks
james
