ToughButterCup

Oh God! I still haven't done it. BUT , work is scheduled for this October. Plan (cross section and plan will be posted here) in September.... I think, definitely, more than likely, probably. Yeah. Hmmmm....

Thats the best idea, I think. It exits the house under the foundation (1.5 m down) and i'm reluctant to dig that far. Since the gas is heavier than air, can I assume that its OK to expose the riser -say 300mm of it - put a 90 in, then a short traverse across the path and into a gabion wall .... ? With an appropriate rodent barrier. The thought of rats under the house floor .... I suppose I'd better check the radon sump first too - for all I know its full of water. Inspection camera's on the shelf in the container : hardly ever need it, but when ya do, ya do.

Exactly correct. And ours will have an MVHR system. But not for a while yet. The issue is that I - incorrectly, naively, stupidly - thought that the house wouldn't be habitable without MVHR. Thats wrong. 6 months of the year, we have one or more windows open all the time. So its a bit like our towel radiators - off for 6 months a year

I can't afford a system either - yet. But I will be able to at some stage. I hope by then, performance will have gone up and price come down for older systems ( they already perform well enough for us ). Or maybe we could rent one for the duration of the last BC visit

They might. The wording of the FO request needs to be carefully considered. A thick skin is cheaper and less effort. 8 years in to our build and the guy a couple of doors down still holds on to the anger he expresses at me not selling him the plot on which we built Salamander Cottage. Last week, by accident, he waved as he drove past the build. Nearly had a quick Scotch on the basis of a scintilla of recognition after 8 years.

Quite. Which is why I stress (above) '... in our particular situation...' Even though we are 'light-and-airy' we still need MVHR. But I now realise that for 5 to 6 months of the year the system will be switched off. If I can't take a joke, I should not have started this build should I ? Keep smiling and get on with the next job.

@Kelvin We have a large slider that sits under the protection of a protected open area ( 4.2m by 2m : we call it the Winter garden. Kevin WotsHisFace from Grand designs calls that sort of area a Breeze Corridor) See the image above. So far the rain has reached that window a handful of times in a couple of years. If we go out - as opposed to go away for a bit - we leave one of the suicide doors (see image - top left) on tilt and maybe the Velux on the latch. Even in bad weather locking the slider open a few mm would not allow any rain in the house. Yes, if we went out for the day and closed everything up it would be stuffy. Cat fart lingers worst of all.

@JohnMo : I accept all your arguments above - more or less. In my particular situation I find to my annoyance and surprise that the house performs brilliantly on its own without help from MVHR. Re: more or less (above) The only time all our windows have been shut is when we've been on holiday. Otherwise at least two are open all the time. We don't mind heat - SWMBO was totally happy in the recent warmth - even at night. I couldn't care less. Our heating season is very short indeed : a couple of cheap Aldi heaters on for an hour or so, and electric underfloor heating in both wet rooms: oh and one of those warm blankets As @craig says above, we can crack the large slider open a few mm - and lock it in that open position. @dnb, I'll be down for that in a year or two. Loads to get on with - especially as I've had a nudge from @SteamyTea about the data handling. Paths and carparks first. @SteamyTea - no outside data - but the university Met Dept is across the quad from where Debbie is ( 2miles away) . I'll go and ask if they have local data (bound to) As to heat input - no data. But we've just had a SMART meter (SMETS 2) installed - and we know exactly how much PV we've injected into our 14 kW SunAmp. (from the inverter and the myEnergi kit). Annoying number of days in June that we exported to the grid. Grrrrr.

MVHR first fit already in place. As I write this post the large slider is open, and both suicide doors upstairs are on tilt. There's no apparent draft, (but there is one I'm sure). And I'm sure that as I get (even) older, I'll feel that more. Just about to have a shower in the wet room : window wide open, door shut - yes there's a draft under the door . Floor dries itself in a few minutes. My point is that there's an obvious advantage to the application of MVHR systems. But the cost - for us i.e. not in general - is effectively double what it is for many ; that is those people who need to use MVHR because of local characteristics. The accident of not being able to afford MVHR (yet) has been an excellent opportunity to see how the house performs WITHOUT MVHR. And I'm saying that in our case, the house performs very well without it. So I'm hinting that others might like consider delaying the second-fit of their MVHR system until they see how their house performs without it. In recognition of @SteamyTea's consistent reference to data-based and evidence - based design, I've now got a couple of years of temperature and RH data. (Using 5 Sensor Push data recorders) . Time to have a look at that data soon, I suspect.

Is the argument that MVHR is for allergy sufferers? I accept that our situation - countryside, sheltered - is not universal. And that MVHR is a good idea. But after the great privilege of living in a Passivhaus (nearly) WITHOUT MVHR for two years I now realise - given that we will use it for 5 months a year - that MVHR is a very much costlier item than I thought. Now, if I could rent an MVHR system for the Final Inspection and hand it back afterwards, I would.

When you've built to near passivhaus standard, and for 6 months of the year your 2.5meter ' picture' window is almost always wide open: why fit MVHR? Hot June: window wide - yes it was a bit warm but who cares? Wet July, window in the wind shadow, so always open. September storms - yes its shut. When its cold but still, and there's bright bright sunshine, its open. So no point in using the MVHR. Put the oven on and the window gets opened. Christmas and the kids around - wide open. Whassa point if the MVHR is going to be off half a year? Even when its cold the two bedroom windows (the suicide doors on the first floor) are put on tilt,the heat from the two of us is sufficient to warm the room a good deal. There's no draft (or if there is its not noticeable) Yes I have to fit it. If I just drill trickle vents in the windows, @craig will cry. But, on the basis of living in the house a couple of years without it, I'm not as much of a fan of MVHR as I once was. It'll be the last thing we fit : second hand if I can get it. Grrrrr.

Its just a pipe laid to a radon sump under the middle of the sitting room floor, about 500mm below my feet as I write (below FFL). Rainwater? Hmmm, hadn't thought of that. Christ I have to give it wee bonnet as well now ? Jesus. The BR spec says it has to be vented above ground. I suppose I ought to dig down now - while I still can without too much bad language - shorten the pipe and bring it to the surface just behind (inside) the brick edging. Oh Lord ... rats ... how to prevent ingress?

After forgetting it was there, and starting to lay the path around the outside of the house, I rediscover our radon outlet. I feel like ignoring it, but I suppose I'd better cover it with a rodding eye cover hadn't I? Or can I just ignore it and just lay the path over the top of it. She Who Must Be Obeyed suggests we just put a large plant pot there. You decide, please would you? I'm just too knackered and frankly I can't be ar@ed.

It feels as if two people in the decision chain made one or more mistakes each. It happens. Fit a door.

Chris Roberts Independent technical consultant and expert witness in the Clean Energy Industry. Solar, Battery Storage, EV, Heat Pumps (downloaded 20/08/2023) No, Mr Roberts, that isn't the case. Evidence? This email to me on application for an Export Tariff with Octopus for a non-MCS instal

Who is 'they' ?

Here's their reply to me yesterday ....

You appear to have a claim against the Architectural Designer - not an architect. Do you have written evidence of the instruction to produce Building Regulations Compliant drawings? If so then yes, on the face of it, you may well have a claim. What's the point of the claim? Have you suffered a material loss? I ask because you - yet - haven't mentioned how you have suffered a loss because of the non-compliant drawings. The construction has been signed off. How are you suffering a loss? Please bear in mind we are not legal experts here. Just hard-bitten, interested, supportive amateurs. To verify whether you may have a claim please consult a legal professional.

This is how it's gone for me @JohnMo One small step for Octopus - feels like they haven't thought this through yet.

Ours is fixed to the wall.. . It's good, not Rat Proof, but good all the same.

None of those (a good few) who beat the stuffing out of me ever threatened to do so. Looking back, often, I deserved it.

Remember with affection the desensitisation of our sheepdog ....

The clue might well be in the name - BIG -Jimbo ?

Moin ! Moin! Wilkommen.....

Yes. The question you might consider asking is : how probable is it that condensation is the culprit. Have you considered that you might have two problems ? A leak and condensation problems. I thought our 'leak' (more like a weep) was caused by the rats frolicking in our insulation. The weep seemed to coincide with the location that the rats entered the roof space. Rats problem fixed - to the extent that they ever can be considered 'fixed'. But still a very occasional weep. Take today for example - very heavy rain for several hours - no water ingress at all. And there hasn't been for a while (i.e. for a few storms) now. Nulok tiles can be taken off very quickly and replaced just as fast. So it's up on the scaff , a quick gander, and nothing - not a drop. Debbie reminded me that it leaks when there's BOTH a strong easterly and heavy rain: fairly rare here. So I need to look for two things - rat penetration on the east face and a path for the water to flow. My point? There are two factors at work. Try this stuff. Water tracing dye . Here's a playlist to help you decide. I've lost mine - off to Screwies for another tub.