Double or triple glazing on south facing walls?

[Onoff]

I know you have to be bloody careful what you stick on glass to avoid it cracking. Especially if you stick "it" to one leaf only on commercial DG units.

[Jeremy Harris]

The main issue seems to be fitting internal films on to double or triple glazed units, as they can seriously overheat the inside of the glazing unit, especially if the glass has a low e coating.  What happens is that heat is radiated inwards, hits the internal film and is radiated outwards.  Because the inner panes of glass are coated, they reflect heat back inwards again.  The result is a significant heat build up.  If the film is on the outside then there's no problem, as it stops the heat getting into the glazing unit in the first place.

[lizzie]

It was the the heat on the laminated glass that caused the issue for us with choice of (external) film.  Lots of different films and different ones from Solarglass in the Sentinel range.  We could not have 70 only 50.  Its best to get your glass properly assessed if its anything other than the regular toughened.

[Jeremy Harris]

The people that supplied and fitted our film did a fair bit of checking and they came back with about a dozen or so different film options that were OK if fitted externally.  These included several films from the Solargard Sentinel range and also films from 3M.  St Gobain were happy with these exterior films on both our laminated and toughened 3G units in the front gable (the upper ones are toughened, the lower ones, including the glazed door are laminated) and also on the standard 3G units in the windows.

 

The Solargard Sentinel Plus film we have on the front glazed gable is SS 15 OSW, which reflects back 75% of the radiant heat and the film we have on the windows is 3M Prestige Exterior clear PR40, which reflects back 61%.  All the windows are now a lot cooler to the touch in bright sun than they were before we had the film fitted.

[craig]

20 hours ago, PeterW said:

I’ve just used an online company and £1200 for 4x2.2m with 4 panels and 2 tilt and turn. That’s for uPVC

 

@craig what’s the biggest unit you would do..?

 

Depends on supplier and how much the person is willing to pay for transport. 

 

Is it just glass or glass and frame? Double or Triple?

 

Triple we can do 3.25 x 2.8, double would be larger. In lift and slide, 6.5 overall width, 2.8 high. 1 fixed, 1 slide, additional gearing and or electrical operation recommended.

 

Standard T&T windows is a max of 180KG, exposed heavy duty hinging.

 

We can do 6 metre high but need to double check the exact specs on this.

 

 

 

 

Edited June 3, 2019 by craig