Double glazing marking BS5713
- Thread starter nickjb
- Start date
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They are just a base stanard, the 5713 iirc is more applicable to the company who made it but is not used any more.
As long as it is in good condition and it locks propery you'll be fine.
The most important thing is the sealed unit will need to have LowE glass. If its a small window, it may be worth just having a new sealed unit made.
As long as it is in good condition and it locks propery you'll be fine.
The most important thing is the sealed unit will need to have LowE glass. If its a small window, it may be worth just having a new sealed unit made.
BS5713 is the British Standard that the units conform to whereas KM21303 is the Kite Mark for the manufacturer http://www.thequalityindex.co.uk/index/?m=00004148&s=5&searchstring= who knows if they'll be able to tell you what glass was used for that unit, they probably make 1000's every year, but you need to identify the frame manufacturer aswell to find out the U value for the windows as it is the window suppliers who will have the U values not the unit suppliers. But TBH they'll probably be ok, it would help if you say what it is you need the U value for. How old are the windows BTW?
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Thanks for that. I'm thinking of using the old kitchen window in the new kitchen extension as it is the right size and looks in good condition.
I need the u value for building regs. Part L 16.9.3.2
"minimum standards for the thermal insulation (i.e. maximum U-values) of the external fabric". Possibly need to plug into 16.9.3.3 if I need to tweak the numbers a bit.
Windows came with the house so no idea of age but it looks in very good condition to me, so hopefully not that old.
Building Control may well want to see something to prove it complies if they think its not new, in reality it won't make much of a difference however it may depend on the inspector and how much of stickler he is and whether he notices or not. If it looks second hand he may well notice and insist on something. Unless you can prove its U value take a chance and fit it and hope he doesn't notice or mention it when he does his first inspection on the founds and see what he says, its up to you. When people start using second hand bits and bobs to build their extension he may start taking a closer look at everything else to see what else you may have skimped on so be warned. What you don't want is for him to notice on his final inspection. Then again he may not give a hoot! Like all professions, you get good/bad inspectors, experience/inexperienced, laid back or jobsworths etc etc. Sorry, no easy answer for that one.
if the inspector quibbles you could replace the sealed unit with one of current spec to get conformance.
you could take the u value of the whole window as 2 for a rough calc.
you could take the u value of the whole window as 2 for a rough calc.
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