Double Glazing - is this acceptable?

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I have recently had new UPVC triple glazed windows installed throughout. I am generally very pleased with the result - they look good and seem to work well. The standard of fitting has been high an the trple glazing gives excellent sound reduction - we are close to an airport!
My query is about the finishing off of the frame fixings. See photo. The screw is a countersunk concrete screw directly into the masonry but the hole has not been countersunk leaving the top of the screwhead 1-2 mm proud of the frame. The fitters said "This is how we do it..." but it looks unfinished. Should I insist they come back and countersink them all? Would you?
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IMG_20240902_112748958.jpg

Thanks
 
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I assume this is visible on the openers. I had the same gripe but it they tried to countersink it then there would be next to no plastic holding it and it could pull through. I dont think they make concrete screws with a flat head, not so ling ago they used to use frame fixings that had a hole in them and a cap with a tab that set in the hole. these https://www.screwfix.com/p/easyfix-...VdYpQBh3aazFJEAQYBCABEgIC0vD_BwE&gclsrc=aw.ds
I didn't bother in the end but you could stick on your own cap so long as it doesn't fowl your opener.
 
Thanks for this.
Yes, they can only be seen on openers when they are wide open, so its not a big problem - and I can see that by doing more countersinking there is a risk of the head pulling through leading to a bigger problem!
 
Not a fan of that at all. Guessing they are ' knockin' screws ? We use a window fixing screw with a torx head , 6mm hole into the concrete , countersunk, very rarely do they pull through the plastic unless you are over eager with the countersink
 
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To be honest I don't even think that's a concrete screw, looks like a generic pvc fabrication screw possibly 70mm long and generally used on mullions on frenchdoors, the fact it's not pulled in any further could mean the threads have already stripped and not gripping anything

Tapcon make genuine pozi head concrete screws but they're usually blue or white and not seen them used in years, most firms now use the torx headed screws Ronnie mentioned
 
Not a fan of that at all. Guessing they are ' knockin' screws ? We use a window fixing screw with a torx head , 6mm hole into the concrete , countersunk, very rarely do they pull through the plastic unless you are over eager with the countersink
So you counter sink the plastic
 
Yes... don't countersink too far just enough for the heads to sit flush...it's thicker than you think ...a good few mm thick and even if you counter sink too far you'll hit thr next chamber and can just cover over the oversize countersink hole
 
Yes... don't countersink too far just enough for the heads to sit flush...it's thicker than you think ...a good few mm thick and even if you counter sink too far you'll hit thr next chamber and can just cover over the oversize countersink hole
Now that sounds a much neater way of doing things - using the inner cavity chamber wall as the fixing point and then a nice neat cap on the facing visible outer profile. Or could that be as issue - are the inner walls thinner.
 
Ideally you don't want to go through the first layer but occasionally it happens when not concentrating properly, honestly with proper ' torx' concrete screws the screw heads normally sit fairly flush , not like that s crew you have there as a fitting
 
Thank you all.
Its very helpful to be reminded that there is another chamber beneath so no serious consequence if it did pull through
I havent used concrete screws much. If I unscrewed one would I be able to replace it straightforwardly?
Following yesterday's points I realise that I only need to worry about the fixings for opening sashs which amounts to 35 fixings - so it isnt that big an ask!
Thanks again
 
Easy to remove. Check thickness of the plastic and if needed give it a slight countersink. Just take your time...
 
'This is how we do it ...'

Reply no. 1 from the tradesperson bible '101 replies for your customer if they query your work'

A tried and tested statement designed to get the customer to shut the feck up, a statement that often means feck all in reality.
 
I kinda understand why they can't be arzed to countersink the screws, but why not use the screws with a slightly domed head and the inbuilt washer, eg


It won't project any further, but it looks better (IMO).
 

These are the type we use , we use an 80 , 120 and a 150 for really awkward to get walls. They do have a slight self tap on the head for countersink , but we always pre drill the countersink to be safe, and always pre drill a 6mm hole in the pvc and wall, despite saying self drilling I wouldn't advise it!
 
Yes these are now the most common window fixing, the description is a bit misleading as they aren't self drilling, you will as Ronnie says need to pre drill and the screws 'self tap' as opposed to self drill, most fitters nip them up just as they start to bow the pvc in which kind of flushes them and are deemed acceptable

Back in the day when I started the industry standard fixing was a 'Fischer' fixing, SDS drill, knock a fixing in, 3 pumps of your yankee and your done
 

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