I think logically the blind is very difficult to argue against on the practicalities.
Quite right. Now how do you get over people not liking them and them not being the vernacular architecture in the UK?
the u-value of a window is only valid when it is closed.
Hence the pragmatic / balanced approach I have to employ every day within the construction industry
Pointless argument on the second one.
That's quite a strong staement to make when you haven't had access to the product or the testing procedure.
The thermal properites on a internal blind are so low it not worth adding to the overall calculation.
And this confirms that you are talking about something entirely different.
I paid £1800 + VAT for my blinds in 2010.7m2 so around the £300m2 mark.
I'm very happy for you, and I really hope that they work for you, but please don't make judgements on the blinds I have without being party to all the information I don't recall gicing you any samples, again, feel free to contact the guys who tested the blinds to get their opinions. You appear to have made a couple of schoolboy errors, actually more than a couple. 😀
£300 + VAT, I hope they're seriously sexy. They should, at least, be very, very sexy at that kind of price.
Post the information and I will review.
The calcuation is wrong but if the THERMAL blinds offer up to a 0.4 increase in thermal resistance then they need to be reviewed for their day to day practicality.
Post the information and I will review.
What info do you need?
Sufficent information to make a review and a technical report or test data for thermal preformance in accordance with BR 443 - 2006.
If you want the u-value of the shutters, the slats are 5,87W/m²K and the boxes are 1,5W/m²K as an example.
Woo hoo a free BRE test.
What's your licencing number/accreditation number? It will be good to have some officially recognised and impartial testing done.
Unfortunately not I'm a senior technican, contract adminstrator, lead consultant, technical adviser, design team leader and best friend to most architects :-).
The industry has been caught out before hence the BR 443 "ground rules".
