Sash window refurb and new glass

RJRock · 5 Jul 2015

some advice please: I'm refurbishing some sash windows in a house just bought. I have removed the frames to effect repair and the glass is very thin and noticed a plastic covering over it too. I think to ensure it doesn't shatter as it was used as an office so probably had some health and safety reason for being installed. My question is, what replacement glass thickness must I use (4/6mm?) and what are the rules for safety glass heights? 6mm wound poss provide better sound insulation but the weight is a possible problem . Currently looking for a recommended two part export resin and fillet too

RJRock · 7 Jul 2015

Anybody able to help?

endecotp · 7 Jul 2015

RJRock said:
what replacement glass thickness must I use (4/6mm?) and what are the rules for safety glass heights?

Google "approved document N". Is the bottom of the window less than 800mm above the floor? How large are the individual panes?

geraldthehamster · 8 Jul 2015

If the bottom of the window is less than 800mm from the floor, it's supposed to be toughened glass. However, a lot of sash windows at the front of terraced houses are less than this, and I've never noticed a kite mark on any of the glass - I don't know if that regulation applies to replacing a broken window.

What is an "export resin"?

Cheers
Richard

endecotp · 8 Jul 2015

It doesn't have to be toughened if the panes are sufficiently small, hence my question about the pane dimension.

ronniecabers · 8 Jul 2015

Anything below 800mm from the ' finished floor ' ( this includes carpet etc and also large internal window sills you can sit or stand on with plenty of room ) would have to be a safety glass of some description....normally 4mm Toughened. Even if you are replacing an old pane it MUST be a safety glass by law...As for small panes , if the width is below 250mm , then you could use 6mm Float glass , or a safety glass of some type, but 6mm Float will affect the weight.

Any pane that you are not replacing is not subject to this , as they are already there, hence a lot of low bay windows , in older houses do not have a stamp to show it is a safety glass

Also , any pane of glass that is deemed to be a critical location must be a safety glass

Export resin ....Epoxy resin

RJRock · 9 Jul 2015

Thanks for advice, will go for 4mm toughened making sure areas don't exceed max area for thickness. I assume that max area 0.5 m square for 4mm applies to any kind of 4mm glass?

Yes, epoxy is what meant.

ronniecabers · 9 Jul 2015

No .... 4mm tough can go quite large ...largest size for wind loading would be 2 m2 ...depending on location

Deleted member 174758 · 9 Jul 2015

RJRock said:
My question is, what replacement glass thickness must I use (4/6mm?) and what are the rules for safety glass heights? 6mm wound poss provide better sound insulation but the weight is a possible problem .

Ideally the same thickness - which can be as thin as 3mm in Victorian buildings. If you increase the weight of the glass you will have to get to bigger balance weigts which may not always be possible in the confines of the sash boxes

ronniecabers · 10 Jul 2015

JobAndKnock said:
RJRock said:

My question is, what replacement glass thickness must I use (4/6mm?) and what are the rules for safety glass heights? 6mm wound poss provide better sound insulation but the weight is a possible problem .

Click to expand...

Ideally the same thickness - which can be as thin as 3mm in Victorian buildings. If you increase the weight of the glass you will have to get to bigger balance weigts which may not always be possible in the confines of the sash boxes

Would still need to be a safety glass of some form if below 800m from the finished floor etc.. though

diynot

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Sash window refurb and new glass

Deleted member 174758

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