Mon, 19 Oct 2026 14:42:29 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=10502&Focus=173342#Comment_173342 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=10502&Focus=173342#Comment_173342 Fri, 12 Apr 2013 13:51:39 +0100 Doubting_Thomas
http://www.greenregister.org.uk/events.php?p=2&id=310&utm_source=Members+%26+Non+Members&utm_campaign=a988dd3ddf-WUFI+Apr+2013&utm_medium=email#event310

Joe Little and a Fraunhofer Institute researcher are offering a 2-day course in WUFI Pro (and an 8-week temporary licence) in Shoreditch on 13th June

I can't afford to go, but thought others might be interested.


T]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=10502&Focus=173350#Comment_173350 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=10502&Focus=173350#Comment_173350 Fri, 12 Apr 2013 15:22:26 +0100 fostertom What is the one other software that's validated under BS EN 15026?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=10502&Focus=173394#Comment_173394 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=10502&Focus=173394#Comment_173394 Sat, 13 Apr 2013 09:26:07 +0100 Doubting_Thomas
Could it be WUFI Passive? It seems to be a product of a spat between the Passivhaus Institut and PHIUS in America. http://inhabitat.com/passivhaus-institute-ends-relationship-with-passive-house-institute-us/

That one passed me by, but it looks like PHIUS have worked directly with the Fraunhofer insitute to develop a separate US-centric software package that in their words 'supersedes' PHPP...
http://www.passivehouse.us/passiveHouse/WUFI_Passive.html

Whilst I applaud the interface with SketchUp, I'm a bit worried this schism could lead to a confusing array of 'passiv/e' products on the market.

Mind you, if it's US based, I doubt it would be validated under a BS EN standard?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=10502&Focus=173523#Comment_173523 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=10502&Focus=173523#Comment_173523 Mon, 15 Apr 2013 13:54:29 +0100 djh Posted By: Doubting_ThomasWUFI Passive
Interesting. Hadn't spotted that before. Other than the press releases, I can't seem to find anything that describes exactly what WUFI Passive does or does not do. There doesn't seem to be any way to find out about it, apart from buying it.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=10502&Focus=173727#Comment_173727 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=10502&Focus=173727#Comment_173727 Wed, 17 Apr 2013 16:18:56 +0100 fostertom https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=10502&Focus=173892#Comment_173892 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=10502&Focus=173892#Comment_173892 Fri, 19 Apr 2013 14:17:31 +0100 Doubting_Thomas
The primary benefit is being able to ask questions of the speakers and the debates that are generated during this time. It's basically like the Ecobuild seminar series but they make the effort to be more regional.

For educating the general construction industry they provide an invaluable and unique CPD resource. For most of the regulars on here, I'd suggest it might be worth going to a session or two before signing up.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=10502&Focus=173895#Comment_173895 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=10502&Focus=173895#Comment_173895 Fri, 19 Apr 2013 14:24:57 +0100 fostertom https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=10502&Focus=175099#Comment_175099 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=10502&Focus=175099#Comment_175099 Wed, 01 May 2013 18:36:24 +0100 lucypedler
Please don't hesitate to get in touch with our office team if you'd like more info about the course, or how membership works.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=10502&Focus=176912#Comment_176912 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=10502&Focus=176912#Comment_176912 Tue, 28 May 2013 12:09:13 +0100 fostertom Posted By: fostertomWhat is the one other software that's validated under BS EN 15026?http://www.greenbooks.co.uk/Book/426/The-Passivhaus-Handbook.html
says Delphin http://bauklimatik-dresden.de/delphin/index.php?aLa=en @ E3000 (seems to include Therm-like stuff too)
vs WUFI @ E1950.

Reading between the lines of the Passivhaus Handbook, I'm seriously alarmed at my hitherto use of the 5:1 rule of thumb, which I've been accustomed to 'bend' by putting the vapour resister partway outboard thro the insulation zone (OSB sheathing on the outside of Warmcel-filled studwork, with more EWI outboard of that). It checks out OK by Glaser method but everyone's saying that's not only simplistic but flawed - mainly because it wrongly assumes that the major (indeed only) source of moisture is from the interior.

I am worried that several built projects may be building up moisture in the fabric, even tho I'll prob be 'retired' before problems show up bigtime.

So I'm going on this WUFI course June 13-14, which includes 8wks free full WUFI license. In those 8wks, first task will be to explore that 5:1 rule of thumb from all angles and in various UK climates. I hope I'll find that things look better rather than worse! Esp as I've always put hygroscopic Warmcel inboard of the vapour resistor.

If I then fork out E1950 for the full license, I'll be setting up shop to run peoples' proposed constructions for a small fee!

BTW this 2-day course counts alone as the 'attend 2 courses' requisite for then joining TGR (£50) if you're so minded.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=10502&Focus=176915#Comment_176915 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=10502&Focus=176915#Comment_176915 Tue, 28 May 2013 13:37:10 +0100 djh Posted By: fostertomReading between the lines of the Passivhaus Handbook, I'm seriously alarmed at my hitherto use of the 5:1 rule of thumb, which I've been accustomed to 'bend' by putting the vapour resister partway outboard thro the insulation zone (OSB sheathing on the outside of Warmcel-filled studwork, with more EWI outboard of that). It checks out OK by Glaser method but everyone's saying that's not only simplistic but flawed - mainly because it wrongly assumes that the major (indeed only) source of moisture is from the interior.

I am worried that several built projects may be building up moisture in the fabric
Where do you think moisture may be building up, and from what source? Oh, and is there any artificial cooling (A/C etc) inside the building?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=10502&Focus=176920#Comment_176920 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=10502&Focus=176920#Comment_176920 Tue, 28 May 2013 15:40:55 +0100 fostertom http://markbrinkley.blogspot.co.uk/, 95% of the moisture in the fabric has originated from outside, not inside.

To add to what I said I was anxious about, Passivhaus Handbook adds its weight to 'typical' figures (within the usual wide range quoted elsewhere) that give OSB low-end vapour resistivity and EPS high-end resistivity - which knocks that 5:1 down to about 1.5:1, as I've been building lately.

However Passivhaus Handbook repeats the usual confused interchangeability of resistivity and resistance in this 5:1 rule of thumb. No one knows which it should be, but it makes a huge difference. Me, I think it's resistivity, i.e. progressive steepening of the gradient, which hopefully drives moisture preferentially to the outside.

So I want to see what the effect of all this is - and whether it's (hopefully) mitigated by the hygroscopic Warmcel inboard insulation.]]>