My two Velux GHL 606 windows glass are cracked due to intense heat. I need to get replacement glass but information about the actual glass size (thickness and spacer) is contradictory and Velux advise 'replace the whole unit' . Some advice is 'all pre 2001 windows are 16mm' , other is 'glass is 24mm' , and ' 4 14 6 ' . Replacing the units looks straightforward enough, and possibly can be done in situ without removing the window. I know from experience how heavy these windows are.. It's difficult to measure the actual unit but it doesn't look like 24mm
Glass sizes for Velux windows
- Thread starter cgkstevenson
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To measure the DG unit thickness follow the guide in the last post in this thread: https://www.diynot.com/diy/threads/when-is-it-best-to-replace-windows.607099/#post-5426108
It will be 16mm at that age! velux do sell a replacement but only in 24mm now, so you would need a conversion kit also.
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You'll get a 16mm unit from any reputable double glazing manufacturer. And glass size for a 606 should be 988 x 994. ( visible glass size ,.. 962 x 930 )..obviously check you are happy with the size as I'm not being held responsible if it's wrong lol.... make sure you get at least toughened glass as a replacement , wouldn't want standard 4mm window glass above my head personally, never understood how velux got away with that one.
Last time we tried to purchase a conversion kit they weren't available...
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Yes I heard they were Phasing them out as stocks ran out.
I thought it must have been heat which caused them to crack but other window facing the same way is ok. It seems it 'could' have been my 3 year old grand children playing with things...
Anyway, the answer to glass thickness is 24mm, which Velux finally confirmed, after initially saying it was 16 mm !
Anyway, the answer to glass thickness is 24mm, which Velux finally confirmed, after initially saying it was 16 mm !
Have you given velux the code for the window? If so have they come back and said its manufactured with 24mm glass ?
I Know this is quite an old post, but just wondering how you got on with the Pane replacement. Did you manage to do it with the Sash in situ ?. I'll be doing this myself shortly with an old GGL606. Velux no longer do the Conversion kits for this size nor do the supply the 15mm glazing units, but my local Glass shop had the size and supplied me with a 998 x 994 4-8-4 Glazing unit. Just rxd the sealing kit from Velux so wondering how you got on ?
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Having done these as part of my job theb I would say they are much easier to do by removing the sash but that depends on how good access is to the sash. Normally you can pivot the sash , either using screw the flat head screw by the pivot slot , or push the button it, on either side and then lift the sash up and out. Seeing as your glass is near enough 1mtr x 1mtr the sash may be awkward for one person to lift out . The reason its easier with the sash out is, reaching all the screws, and them undoing isn't always simple leaning out on to the roof, sometimes the old screws snap, sometimes they don't want to budge, and the sash being out on the floor makes it a lot easier to deal with. Having said that it is possible to do it on situ.
A big thing to note though is velux , originally, didn't supply rooflights with safety glass in them, so be careful removing the glass, especially in the sash is still in situ and consider the effects of gravity ( i know , quite obvious but youd be surprised how many people dont lol )....I'm hoping the place you purchased the new unit from supplied it with toughened glass, as to me , and a lot of other people in the industry, having non safety glass above your head is a huge risk...
A big thing to note though is velux , originally, didn't supply rooflights with safety glass in them, so be careful removing the glass, especially in the sash is still in situ and consider the effects of gravity ( i know , quite obvious but youd be surprised how many people dont lol )....I'm hoping the place you purchased the new unit from supplied it with toughened glass, as to me , and a lot of other people in the industry, having non safety glass above your head is a huge risk...
Thanks, Really informative
The new Glass unit I have is Toughened Glass. The Window is at a reasonable height ( about Hip height but its in a kinda cramped space for access by two people, hence my query about doing in situ. I've got a couple of decent quality double suction cups for lifting Glazing, and can maybe use these for actually lifting / Handling the sach out and in if needs be. Maybe have to get the missus involved for lining up the locating pieces when it goes back in.
The new Glass unit I have is Toughened Glass. The Window is at a reasonable height ( about Hip height but its in a kinda cramped space for access by two people, hence my query about doing in situ. I've got a couple of decent quality double suction cups for lifting Glazing, and can maybe use these for actually lifting / Handling the sach out and in if needs be. Maybe have to get the missus involved for lining up the locating pieces when it goes back in.
Yeah float glass not good....
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