Laminate glass U value?

[wiggyboy]

I have a quote to recondition my sash windows. Double glazing is not possible as these units are too thick...a common problem with old sash windows. The company suggest laminate glass as an option (2 sinlge pains with a resin middle).

However, what is the U value for laminate glass as i can't find it anywhere on the web? It's not worth adding cost and weight to the windows if the insulation properties are no different from single glazing (U value of ~5.6)

thanks

 

[freddiemercurystwin]

Hmm, interesting, give Pilkington a ringo on Monday and ask for their technical department, if they don't have an answer I'll eat my white leotard! It does sound plausible though.

http://www.pilkington.com/europe/uk+and+ireland/english/contacts/people.htm

 

[philipdayton]

the U value of laminated glass is the same as float - 5.8W/m2k

It is possible to get low emmisivity film which can be applied on the inside of the glass : http://www.llumar.co.uk/fms/insulation.asp

 

[wiggyboy]

Ok, called Pilkington as you suggested. Also as philip suggested there is no extra insulation benefit in using laminate glass over single glazing (even if laminate is effectively 2 pains) .

they suggest I use the minimum double glazing width of 14mm
(4mm float glass - 6mm gap - 4mm Low e glass)

I also saw slimlite units http://www.sashglass.co.uk/products.htm

any experience comments on this?

 

[JohnD]

Have you considered secondary glazing inside? If you have net curtains it will be practically invisible and will not detract from the period appearance.

It will also be much better at muffling sound and draughts than ordinary double glazing.

 

[biffvernon]

If you get double glazing with a small gap get it with krypton fill rather than argon fill. More expensive though.

 

[Symo]

This is the stuff you want. Don't know if it's available here quite yet but a quick email to the mfrs will answer that.

http://www.nsg-spacia.co.jp/spacia/summary.html

Clever stuff!

Symo