I need some glass. Ordinary window stuff. Is there a formulae for the correct clearance? Or just 4mm off all round, etc? And what do the suppliers prefer? Mm, cm, mtrs?
I've not bought any window glass for many years and am rather curious.
I need some glass. Ordinary window stuff. Is there a formulae for the correct clearance? Or just 4mm off all round, etc? And what do the suppliers prefer? Mm, cm, mtrs?
I've not bought any window glass for many years and am rather curious.
2-3mm all round IMHO. They prefer mm. If it's not "for a greenhouse" it will have to be 6mm glass for a window.
I just bought some laminated for secondary glazing on a door and the recommendation was 3mm less all round. I would suggest going along with the actual size and the size of the rebates and ask for their recommendation.
I always use mm. I also check the glass before leaving because I've found some glass merchants to be a bit sloppy.
To email, substitute .nospam with .gl
3mm clearance OK
MM is preferred.
Why 6mm?
4mm is the norm for windows where "Safety glass" is not required.-- Mike
I thought the standard was 4mm. All these Victorian houses, what is the original glass in those, 3mm? 4mm?
Regards, NT
More likely 3.175mm (approx) or 1/8".
Victorian/ large panes tend to be about 3mm, smaller panes can be 2mm. You may not be able to replace them with thicker glass because of the tiny rebates. Tiny rebates also means accurate fitting - allow no more than 3mm overall off the dead measurement, and check for squareness. Don't use sprigs except as temporary holdingg.
cheers
Jacob
You may be right - it's certainly 6mm for a glazed 15-pane door for example, but I guess they may have tighter restrictions on doors than windows - The essence is the concept of a "critical location" and recent changes to the law on glazing. One of many advisory page for glass suppliers has some details:
Replacment windows (ie where you change everything not just a broken pane) are even worse (depending on how you look at it) as they must be replaced by double glazed units of the current required U value. Recent changes to the law require this now on a window by window basis ("incremental").
Another one of many websites:
Out of interest, what sort of price is this?
We have a couple of panel that we would like to replace with glass (they look out into our porch which has a double glassed door) in order to make the hall way a little brighter.
300mm x 900mm ish I would guess. As they are at ground level and therefore liable to be kicked etc by the kids I assume something like laminated would be best (or even required). Is it expensive?Darren
Prior to metrification glass thickness was classified by its weight, in ounces per square foot. Victorian windows would have been glazed with 3oz or 4oz glass for small panes and maybe 6oz for larger panes. Or there was picture glass (about 2oz) or greenhouse glass (poorer quality of any thickness). Anything thicker than 6oz was plate glass and *extremely* expensive, which is why there used to be special plate glass insurance for shopfronts etc. Due to the old manufacturing processes the thickness varied slightly, which is why old glass is not optically perfect. The numbers in oz's roughly equate to the actual thickness in mm of modern float glass.
Peter
Laminated glass would be good. It's dearer than ordinary float glass of course, but not vastly. It is a *bastard* to get through (see
J.B.
In article , jacob writes
Late Victorian panes 1m x 1.2m are 6mm in this neck of the woods (Glasgow).
Larger (1.5sqm) panes in my late Victorian (c1900) windows are 6mm/ 1/4"
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