I have recently had some upstairs windows installed which were fitted with ‘k glass’. All appeared ok until two days later one of them was misted up on the outside pane due to it being a cold morning and there being a boiler flue underneath. The misting revealed what appears to be scratches over the whole of the outside pane, although it is difficult to feel anything by hand. On cleaning, the window appears fine but if left for several days dust seems to settle in the scratches which then become visible again. Also, in heavy rain, the water appears to run down the channels created by the marks. The remaining windows were tested using a kettle and found to have the same results.
The installer is now going to turn the panes around as he says the coated glass is on the outside pane, (albeit on the inside face), and this should cure the problem. However it is my contention that the coating may be on the external face of the glass and this has been damaged when cleaning the windows after installation. If this is the case then dust would still eventually settle and the marks reappear. Even if this pane is normal glass surely the same results would occur.
I have attached a photo and any advice as to what this may be would be appreciated.
The installer is now going to turn the panes around as he says the coated glass is on the outside pane, (albeit on the inside face), and this should cure the problem. However it is my contention that the coating may be on the external face of the glass and this has been damaged when cleaning the windows after installation. If this is the case then dust would still eventually settle and the marks reappear. Even if this pane is normal glass surely the same results would occur.
I have attached a photo and any advice as to what this may be would be appreciated.