Mastic peeling from newly instavlled PVCU windows
- Thread starter HanaM
- Start date
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Hi,
is what they have used rubbery, shiny and flexible? or quite hard? and has a dull finish.. that you think can be painted over.
if its the latter, could be they have used caulking rather than silicone outside.
Caulking doesnt bode well with cold weather, frost and things.
So the normal rule is, caulking for inside, silicone for outside.
not like silicone to peel from brickwork.. normally it bonds quite well to plastic and brick.
is what they have used rubbery, shiny and flexible? or quite hard? and has a dull finish.. that you think can be painted over.
if its the latter, could be they have used caulking rather than silicone outside.
Caulking doesnt bode well with cold weather, frost and things.
So the normal rule is, caulking for inside, silicone for outside.
not like silicone to peel from brickwork.. normally it bonds quite well to plastic and brick.
Thanks! More details:
The mastic is looking like a rubber and feels like it with white colour (not possible to paints over it). When touched, it is 'coming away' like rubbing away with pieces coming of it (when touched with a finger). A piece of wood flicks it away fully allowing water to get underneath. It does not seem to the plastic well, but it seems to be sticking to the brick.
The mastic is looking like a rubber and feels like it with white colour (not possible to paints over it). When touched, it is 'coming away' like rubbing away with pieces coming of it (when touched with a finger). A piece of wood flicks it away fully allowing water to get underneath. It does not seem to the plastic well, but it seems to be sticking to the brick.
Get them back to re-do it if you are not happy as water can get in.
There could be a number of reasons for this, poor quality silicon, surfaces were dusty when it was applied or if the surfaces were wet at all.
There could be a number of reasons for this, poor quality silicon, surfaces were dusty when it was applied or if the surfaces were wet at all.
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Probably wrong type of silicone used, theres low mod, high mod, neutral cure etc etc
Without meaning to hijack, can you tell me (and everyone else) which is the best for uPVC windows as I've seen this sort of problem loads of times - usually as a result of using all purpose silicone.
I've been told low mod in the past but the more confirmation the better! It may well have been you, crank39.
Without meaning to hijack, can you tell me (and everyone else) which is the best for uPVC windows as I've seen this sort of problem loads of times - usually as a result of using all purpose silicone.
I've been told low mod in the past but the more confirmation the better! It may well have been you, crank39.
Probably was, this link will explain better than i could....
http://www.thewindowman.co.uk/sealants.htm
I come across this nearly everyday when inspecting, trouble is window fitters just seal up with whatever they have to hand
Excellent link, crank39 - thanks!
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