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Re: Hibond Flooring

Yes, Matthew, that sounds good. It's a bit complex in particular the heatflow paths around the edges are not straight, and some loss may already be captured in the wall heat loss.

But it may give you a slightly more accurate R-value than the DesNav calculation.
by Albrecht Stoecklein
Mon May 07, 2018 8:37 pm
 
Forum: Design Navigator H1 Compliance Calculator
Topic: Hibond Flooring
Replies: 3
Views: 80

Re: Hibond Flooring

Hi Matthew, The way you have entered this details in DesNav is that there is a complete layer of Expol under the concrete slab which is not interupted by any strapping or floor joists. If this is the case then the R-values of the insulation and the concrete (and the surface resistances) can simply b...
by Albrecht Stoecklein
Fri May 04, 2018 2:48 pm
 
Forum: Design Navigator H1 Compliance Calculator
Topic: Hibond Flooring
Replies: 3
Views: 80

Re: Triple glazing Construction R-value

Hi Jason, I think 10 or even 5 years ago you would have to look very hard to find triple glazing in NZ. Even today there would be only a few specialist glazing companies or importers where you get triple glazing. The WERS system was actually created about 15 years ago if I remember correctly, and ha...
by Albrecht Stoecklein
Wed Mar 21, 2018 10:54 am
 
Forum: Design Navigator R-Value Calculator
Topic: Triple glazing Construction R-value
Replies: 3
Views: 463

Re: Triple glazing Construction R-value

Hi Jason, The U-value is the inverse of the R-value. Glazing manufacturers often only quote the "center of glass" R-value. That does not account for the frame. The total window R-value (including the frame) is sometimes called the construction R-value. That's the value you need to use for ...
by Albrecht Stoecklein
Tue Mar 20, 2018 5:59 pm
 
Forum: Design Navigator R-Value Calculator
Topic: Triple glazing Construction R-value
Replies: 3
Views: 463

Re: Airtightness membrane

Hi Jason, The NZ Building Code does not account for infiltration losses, but only for heat conductance (R-values). It actually becomes quite complex when you account for air tightness, because it could prompt people to make houses as air tight as possible. If that is not managed well (via dedicated ...
by Albrecht Stoecklein
Tue Mar 20, 2018 5:27 pm
 
Forum: Design Navigator R-Value Calculator
Topic: Airtightness membrane
Replies: 1
Views: 179

Re: floor type not listed

Hi Jason, Yes, you are basically double counting. The option as I have shown it does assume that the insulation layer is between the screed and the structual concrete and that it covers the entire slab including the slab edges. Only if you would have insulation under the structural slab would you ha...
by Albrecht Stoecklein
Tue Mar 20, 2018 5:19 pm
 
Forum: Design Navigator R-Value Calculator
Topic: floor type not listed
Replies: 3
Views: 266

Re: floor type not listed

Hi Jason, The slab floor R-values are actually extremely complicated to calculate for various reasons: The heat flow paths are 3-dimensional (rather than mostly 2-dimensional as in walls and roofs), the effects are very dynamic including significant thermal storage effects and the exact properties o...
by Albrecht Stoecklein
Tue Mar 20, 2018 12:08 pm
 
Forum: Design Navigator R-Value Calculator
Topic: floor type not listed
Replies: 3
Views: 266

Re: Enclosed Balconies on upper floor level

OK, that's good. :)

Yes, the section that sits over the entry area on the ground floor would be treated as the roof for the entry area.

Sunny regards

Albrecht
by Albrecht Stoecklein
Fri Feb 09, 2018 2:22 pm
 
Forum: Design Navigator H1 Compliance Calculator
Topic: Enclosed Balconies on upper floor level
Replies: 2
Views: 658

Re: Non existent ThermaxB 5mm product

Hi, Not sure. I think the best contact to ask would be someone at the National Association of Steel Framed Housing (NASH). I had communications regarding the ThermaxB some time agao with Gordon Barret (gordon.barratt@frametek.co.nz) and Carl Davies (carl@nashnz.org.nz). I hope that helps. Sunny rega...
by Albrecht Stoecklein
Tue Jan 23, 2018 10:17 am
 
Forum: Bug Reports
Topic: Non existent ThermaxB 5mm product
Replies: 3
Views: 2374

Re: Are Standard Timber Purlins also Thermal Breaks?

Hi JK, If the timber battens are along rather than perpendicular to the steeel framing they can be considered as thermal breaks. If they are mounted perpendicular the area that they cover under the steel framing is so small that they would have to be ignored. Purlins are normally mounted perpendicul...
by Albrecht Stoecklein
Wed Dec 20, 2017 2:37 pm
 
Forum: Design Navigator H1 Compliance Calculator
Topic: Are Standard Timber Purlins also Thermal Breaks?
Replies: 1
Views: 924
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