It's only 'proof', if it passes. What if it fails, even by a tiny amount ? Does that make it a non-passive house, performance-wise ? No it doesn't...I again, i agree..... But a certificate is proof non occupants that its DOES perform.
Without a cert, wheres the proof?
Would the heating bills not provide some form of empirical proof.
[this, from a guy who issues certs for a living ]
ONQ.
PS Not passive house certs, BTW...
+1, proof of the pudding is the eating, and all that...
I'm wading in here. I'm completely with Syd on this and I'm going certified (assuming I can satisfy the criteria).
You won't have heating bills. You will have an ESB bill alright. But most passive houses (even in our milder climate) will have a stove of some sort as a back up and it's not easy to prove how much or little you light it.
Plus there are people that are very warm souls that need a window open at night in order to sleep. There are those that prefer to be able to walk around in our underwear when there's a foot of snow outside. To the former, any house could be warm enough. You see where I'm going.
My biggest fear.... I'm building a house (3256 sq ft) to PHI spec with the target to achieve the certification. However, if I fall short (say 16kw instead of the 15kw target) I don't get the cert but the house will perform like a passive house. The certification has to draw the line somewhere so I don't have an issue with this. If faith should deal us a bad hand 5 years down the line and we were forced to sell, all I really have is a big house that needs a heating system installed from a buyers perspective. I'm actually planning on burying rad pipes in the screed so that should that happen (or if we fall we short of passive) I have a fall back that doesn't involve digging up floors etc to resolve.
That is exactly my point.......
But you will have heating bills - but in a different format. No oil, or gas, but the heating effect of living in the house, and the electrical consumption, is a defacto bill.
But I see where you're coming from, but you're actually making the same point as I: you are building towards an aspirational performance level, and if you just happen to miss it, it's still a very good house, no PHI cert, but you'll have a back-up plan. This is all good, but also infers a certain disfunction between the cert, the real world, and of course, that huge variable: personal preference.
And of course, you're house could technically meet all the requirements from a quality-of-construction point of view, and still fail, if, for instance, the design, or location, or orientation of the house works against you. And these are, frankly, insurmountable obstacles, compared to construction details.
For example, I know someone (in the trade) with a beautiful house. He will be the first to say it is pointless he doing a BER on his own house, and especially an airtightness test as he, from one end of the year to the other, NEVER closes the sashes on the upstairs windows ! So, does that make his house 'bad' ? No, it just makes his, fit his personal preference, which is what a HOME - as distinct from a house - is supposed to do.
If OP would like a chimney then no reason not to have one
I think the OP needs to answer this first, actually, and then decide what's possible, performance-wise (whether passive, 'Passiv', 'high performance'...or whatever......
Noob question: How is heat escaping when people enter & exit these passive houses handled?
Ha, good one ! - airlock, anyone
....indeed it is ! Even 'Passiv' people have to go out, sometime.its not handled
when the triple glazed argon filled airtight doors are opened, heat will escape.
Unless they're bears, that is.......and hibernate 'til spring
You are concerned that the house you are building to passive standard may fall short of the standard, i.e. it might use 16kwh/m3 to heat.
Just a question really, shouldn't you know before you start building if the house is going to pass, assuming the Passive House software has been used, and the house is built with good workmanship with all the correct materials.
What can go wrong ? I'd be thinking dont bother putting in pipes under the screed, just get your design and build right !
I'm a bit unclear too about the data logging to prove its passive. Obviously they need to see your electricity bills during the monitoring period......its impossible to tell from an electricity bill what energy was used for heating alone (unless they put a kw/h meter on all heating devices).
Also it would be difficult to monitor how many kw/h came from coal or wood, should the house have a solid fuel unit (not difficult mathematically to work out) but difficult for the passive house people to verify how much wood was burned.
....aah, now we're getting somewhere. This is a good point. Consider the corollary of all you consider, above, and you are purchasing said house in 5 years time: what's to say the PHI cert is in any way indicative of a real-life living situation ? The only true arbiter is.......money. How much it cost to provide the heat - in whatever form - it took to live in.
Exactly. And, just as sure as the likes of BER's not including habitable space, wait 'til you see 'creative' designers 'adjusting' floor sizes and room volumes to achieve the desired results...........I was in a house that was being monitored and the heat recovery unit was switched off,which is bound to have an effect on the reuslts.I was told that they switched it of just before I arrived,that they had been showing another person around and must have forgot to switch it back on.Maybe genuine,but I know another guy who was there on another day and had the exact same story!!