Passive windows

bikerboy_ie

Have received a too good to be true quote from Munsters larget window manufacturer for passive spec windows and doors for a new house. They are triple glazed pvc units with insulated frames and have overall u-values of 0.8.
The price though is less than half of it's nearst competitor for the same spec window. Does anybody have any experience with these windows?

sydthebeat

bikerboy_ie wrote: »

Have received a too good to be true quote from Munsters larget window manufacturer for passive spec windows and doors for a new house. They are triple glazed pvc units with insulated frames and have overall u-values of 0.8.
The price though is less than half of it's nearst competitor for the same spec window. Does anybody have any experience with these windows?

ask for their passivhaus certification..

ask to see all test results....

ask to see their WEP certification..

im always wary of suppliers that do not post their product testing results for all the public to see.

bikerboy_ie

I have been informed by their rep that the are fully certified and can present all of the documentation to back up their spec

martinn123

bikerboy_ie wrote: »

Have received a too good to be true quote from Munsters

Sounds too good to be true ? how many sad tales start with this message.

What are payment terms, last time I came across a quote they wanted payment in full up front, so little comeback if anything goes wrong.

if the Certs are OK and the price is right proceed on normal business terms, pay a deposit and balance on completion

sas

If they are Passive House windows they have to be tested for air permeability to the European stand EN 12207.

Ask them what result they achieved?

It should fall in the range of 1 - 4. You're looking for a 3 or 4.

sydthebeat

bikerboy_ie wrote: »

I have been informed by their rep that the are fully certified and can present all of the documentation to back up their spec

would you know what to look for if you saw their test results?

bikerboy_ie

Already have some idea thanks to the last few posters (cheers by the way!) and I would imagine google would do the rest once I get my hands on some test sheets.

sinnerboy

Please keep in touch and post further info on test data when you get it

look for

Uf U value of the frame
Ug U value of the glass
g factor of the glass - solar thermal transmittance % ( how much % heat gets through )
ψg Linear thermal transmittance of the glass spacer
ψinstall Linear thermal transmittance of installation of the frame into the wall
Uw Whole window U Value , not installed ( PHI min Value is 0.8 W/(m2k)
Uwinstall Whole window U Value installed ( PHI min Value is 0.85 W/(m2k)

.

imitation

Interesting, I got a quote from two other firms for the same type of windows and they were 60% of the price of that company I think you are on about. On the whole 0.8 U value windows appear to be around 40% more than double glazing around the 1.2 mark. Would most people support this statement or should I also be asked the guys I got quotes from for test results ?

sinnerboy

IS EN ISO 10077-1 is the standard method to arrive at a whole window U Value

You must insist that the supplier issues certificates from an accredited testing authority - http://www.eota.eu/
- not their own "technical department "

Otherwise the supplier can make any claim he likes - for his product ( and for your money ).

atech

Sinnerboy,

The following are the approved standards the NSAI allow manufacturers submit to get the WEP rating of a window, as you said ISO 10077-1 is the typical one used.

(Frame thermal transmittance (Uf) shall be determined by using:
I.S. EN ISO 10077-1:20061 Thermal Perform of Win Doors and Shutters Cal of
Thermal Transmittance Part 1: General, Table F.1
or by calculation using:
I.S. EN ISO 10077-1:20061 or
I.S. EN ISO 10077-1:20061 and I.S. EN ISO 10077-22 Thermal Perform of Win
Doors and Shutters Cal of Thermal Transmittance Part 2: Numerical Method for
Frames
or by hot box method using:
I.S.EN12412-2-20034 Thermal Performance of windows, Doors and Shutters -
Determination of Thermal Transmittance by Hot Box Method- Part 2: Frames
as appropriate.)

Would you know if a window was tested to ISO 12567-1:2000 and was tested by an accredited laboratory other than the NSAI would the overall u-value of that be comparable with the hot box method mentioned above?

atech

Ignore my previous post.

I just realised that ISO 12567-1:2000 is actually the (Uw) of the window, thats the one for the overall window u-value.

You confused me there for a bit sinnerboy.