Steel 1930's casement windows

[RichA]

I have Steel 1930's casement windows. the front of the house (East facing) are single glazed (4mm?). The rear (West facing) had already been upgraded to double glazing (looks like 4-6-4mm).

I am considering upgrading the glass on the front of the house.

How much of a difference will it make / is it cost effective for improving the insulation of the house?

What glass is recommended, where is the value point in terms of spec? .e. argon filled/low E, etc

Thanks.

Looking at the Pilkington tables the existing windows would be c4.8 U value. And new 6mm double glazing would be 2.3-3.1 U.

 

[ronniecabers]

Depends really what type of glass you are going to and how thick the units are going to be , as to what you can achieve u value wise. If you are having the entire frame replaced, the minimum u value you now put in is 1.6 anyway

If my memory serves me correct , Lowe e glasses don't work very well in thin 4-6-4 units , and imho , if your budget could stretch get new frames, having said that though the 4-6-4 units will be better than 4mm single!

 

[RichA]

Thanks. I was hoping to keep the existing frames. So would only be able to fit windows with a total width of 14mm (or 16mm at most).