Replacement uPVC double glazing installation conundrum (installation by reputable installer)

[B52s]

I'm looking for some advice to get the best technical performance and aesthetically pleasing solution to a problem, as I'm starting to lose confidence in the reputable window installer who may not be giving the best guidance and honest answers.

 

I have recently contracted a local double glazing company (good local reputable installer), but I'm not happy with the actual install which has created a 25mm gap between the bottom edge of the uPVC window frame and the concrete sill. The previous timber uPVC windows had a discrete metal trim that fitted neatly between the window frame and the sill which made the windows aesthetically pleasing.

The installer has given me two options;

 

1) Leave installation with the 25mm gap, which I'm told, will not result in water ingress as the window sits on the rear (concealed) raised edge of the angled sill inside the wall, albeit I think strong winds could drive rainwater under the uPVC sill, which is evidenced from 'capture 05' pic below. However, I'm also concerned about the impact this gap might create in terms of the thermal performance of the timber frame structure. Furthermore, the bottom edge of the uPVC window frame is straight where I would have expected this to be bull-nosed? Lastly, I just feel leaving a gap just looks bad.

 

2) At the moment, I have agreed to the second option, albeit I do have an opportunity to reverse this decision. The installer has filled the gap with expanding foam and it going to return with a builder to fill the gap with 25mm cement pointing positioned slightly behind the edge of the uPVC sill. I'm just not sure how this will look, but probably the best out of a bad situation?

 

I'm increasing becoming concerned that what has been designed and installed (by the reputable installer) is not actually fit for purpose?

 

Your thoughts on the best way forward would be very much appreciated, TIA

[Nickfromwales]

I'd have rather had a dummy cill slid in under the functional one, than that gap, with that additional one fettled so it follows the angle of the concrete cill!

 

The 25mm of cement infill will be no good, as it'll just give up over time and look terrible. But then the installer would have washed their hands of the job.

[B52s]

43 minutes ago, Nickfromwales said:

I'd have rather had a dummy cill slid in under the functional one, than that gap, with that additional one fettled so it follows the angle of the concrete cill!

 

The 25mm of cement infill will be no good, as it'll just give up over time and look terrible. But then the installer would have washed their hands of the job.

Thanks for that Nick, that makes perfect sense. Not paid the installer yet, so still have a firm grip over him. The installer has been back and few times to sort out some other snagging issues, so he's a wee bit on the backfoot at the moment. The T&Cs are in my favour as payment is not due until the customer is satisfied. As I said above, the large installer has a proven track record in my area.

[Nickfromwales]

10 minutes ago, B52s said:

Thanks for that Nick, that makes perfect sense. Not paid the installer yet, so still have a firm grip over him. The installer has been back and few times to sort out some other snagging issues, so he's a wee bit on the backfoot at the moment. The T&Cs are in my favour as payment is not due until the customer is satisfied. As I said above, the large installer has a proven track record in my area.

Be nice to each other and agree an amicable resolve. Simple!