chris French
wibbled on Monday 22 March 2010 18:58

In message , Arthur51
writes
I've read a few posts from the past here and people have talked of
14mm upto 22m thick options.

Or even upto 28mm nowadays.


What are the advantages/disadavatages of thin against thicker
double glazed units?


Thicker gives better heat and sound insulation.

Thinner needs a shallower rebate and maybe a little cheaper?

There is a sweet spot though, where a bigger air gap gives a diminishing
return on the thermal properties. The acoustic properties continue improve
though IIRC.

I know this because when I was evaluating my old ali DG windows (quite small
air gap as was common in the 70's or early 80's) I discovered a table
somewhere that indicated it wasn't much worse (within 90%) of modern DG
units with their massive air gaps (like for like comparisons obviously -
mine don't have K glass).

Where mine fail more is the thermal break in the frame is only 4mm, which is
better than nothing, but nothing like as good as modern ali units. My
overall conclusion was that it was not remotely worth replacing them, even
though I will have to replace a lot of the glass due to it having misted.

If anyone wants proof, I will try to find the table, but it was a couple of
years back...

--
Tim Watts

Managers, politicians and environmentalists: Nature's carbon buffer.