UPVC Double Glazing Seals Post questions and find answers on glazing, double glazing, upvc glazing, conservatory glazing, fixtures and fittings etc....

[scotty99]

[size=18]I am getting moisture between my external black seals and the glazed unit in my new windows. The installer tells me this is normal as weather proofing is via the sealed glazed unit and the black seal is there only to stop vibrating/rattling in the wind. I am worried that eventually I will get algae or mould growth where the moisture lies and I will be unable to clean it out. ANY ADVICE PLEASE[/size]

[stoneyboy]

scotty99,
The seals should be a really tight fit against the glass and therefore should form a waterproof seal. It is inevitable that some water will get into the frame and this is why there are drainage channels on the outside of the frame.
If you can push the DGU from the outside and it comes away from the seals get the installer back.
end

[scotty99]

Many thanks. The windows seem tight - I cannot move them. That said the moisture is still there. It gathers after a bout of rain and then dries over a period of a few days. I have noticed what looks like UPVC dust/arisings along the inside of the seals next to the glass. Maybe that is causing a less than tight seal. Again the installer tells me that the water will eventually drain down and out through the drainage holes in the bottom of the casement frame and so thee is no problem. I am not so sure and may have to get some sort of written second opinion. To me the seal/gasket is meant to seal.