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So mine are old metal frames - no idea how old, house is 1960 - about 35mm overall so i think the glass will be either 18 or 20mm . I've pulled out some wedge gasket. Can't measure exactly but analog callipers give me as below - any advice on where to find replacements if I do try and DIY these ?
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Sheppz
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https://jcphardware.co.uk/gaskets-seals/
Theres none that look like a definite match, but you will find one that's close enough.
the 2mm throat will hook in behind a small lip inside the frame so it doesn't fall out.The 3mm is how much gap is remaining between the glass and frame. Too loose and it will keep falling out, too big and it will be a sod or impossible to fit. Definitely not the reddilock.
R9227 is quite a soft rubber
I don't have any of the corded wedge but there's 3 that maybe usable
The sample packs have small 10cm sections, which I find too short to get a good idea. Order a metre
user69121
I find two flat knives are more use than the 7 function one.
Can you collect the unit safely and without damaging it?
They come without any packaging.
https://www.screwfix.com/c/safety-workwear/work-gloves/cat850338
The KS520 are probably a good idea.
DGU overall thickness has mainly been 16, 20, 24 and 28mm. However I did a unit yesterday that was 22 (I actually deglazed it to try 24mm as the bottom half of the door has a 24mm panel!)
Historically the spacer bars were silver or gold aluminium.
Plastic warm edge spacers are available in silver, gold and black, and I tend to fit black unless it's beside other units that aren't being replaced.
Deglazing it and measuring the thickness and width/height is a good idea if you don't have glass calipers to measure around a frame... Saves having to work out the bead clearance size too.
Measure the overall thickness and edge to edge size and temporarily refit the two longest beads
If it's 800mm or less from floor height to the glass, or in/joined onto a door then you'll need toughened glass.
Do you want Low-U energy efficient glass?
If it's newer than 2003 then it is more than likely Low-U that's fitted.
Theres nothing stopping you from upgrading older units to Low-U, except the coating gives a very slight tint which may be noticeable if this is part of a multi paned window and you not replacing them all.
It's not always reliable, as some coatings don't really show up well, but you can use a torch and look for a slight change of tint between the first and second reflections.
650mm wide x 700mm high
4mm clear float
12mm silver spacer
4mm clear float
650mm wide x 700mm high
4mm clear float
20mm black warm edge
4mm clear Low-U
650mm wide x 700mm high
4mm toughened clear
20mm gold warm edge
4mm toughened Low-U