Tony L

I'm not qualified to answer your question, but if I was going to spend hours working in a tiny office, with perhaps minimal ventilation in the winter months, for comfort & to keep the heating costs down, I'd get myself a CO2 monitor (about £100 - £150 for a good one, I should think) & I'd do some Googling to learn about this then monitor the CO2 levels, because even a safe, but elevated, level of CO2 can make you feel drowsy & kill your productivity.

This one looks easy to clean https://pin.it/3J9HYaHe7

Thanks, @Great_scot_selfbuild. Those drawings are really useful. I don't remember seeing any MVHR layout drawings that are as good as those before now.

Could you share the name of your MVHR supplier please, @Great_scot_selfbuild. I'm in Surrey too, & it would be good to speak with a supplier that's had a BH recommedation.

I'd be pleased to have these. & I think they look good too. The plinth in front of the sink in our on-site caravan is ruined, because there was a leak behind the sink we didn't know about. These strips would have saved them.

Well done @TheMitchells. I have a load of this to deal with, on two separate buildings. I'm kicking the can down the road for now - there's a house to build.

Thanks for sharing your experience @Spinny. It’s not just you & @saveasteading – this would drive me mad too. I had a similar (or you might say opposite) concern when I was doing a single wall, in Carrara tiles, in a bathroom at a previous house. These are natural, so every tile is different, of course, but Iooking at some installations of Carrara tiles that have their flows of grey veins butting up against adjacent tiles with the flow going off at 90 degrees or so looks really unpleasant to me. It’s too random. For my installation, I unpacked all my boxes of 300x300 tiles & fiddled around for a good amount of time, setting them out on the living room floor, to get all the flows going in one direction, with all the whitest tiles on the right top corner of the wall & the tiles with the most grey in the opposite corner at the bottom. The tiler followed my instructions perfectly. The results were well worth the additional effort. I too think the tone of @Nickfromwales' comment was absolutely fine – NFW devotes so much of his free time to posting very useful advice, we really ought not oblige him to spend even more time devising a warm & fluffy translation of whatever he wants to say, before every opinion or piece of advice is posted.

I'm not thinking that's wrong, but I'm interested to know if there's any reason why you made the middle white brick Marmox, rather than the lowest of the three white bricks?

I don't have the same expertise as the other contributors to this thread, but I'd have thought buying in some ready made trusses, to give a low angle dual pitch roof would be the best solution. If you tell the truss company what your roof finish will be, they'll work out the truss spec' for you.

A lot, in my opinion. AeroBarrier

Nor might I either, but paying Devon prices didn't work out well for me, so I'll see what the Surrey quotes look like. I agree, but I don't want to do everything through email & Teams, so it matters to me. Thank you for the Splash tip.

I sacked him via email & I haven't heard back from him yet. He had lots of help from me before he got going & lots more help from me (which I didn't expect to have to provide) over the past several months. I paid £3,600 (50%) before he got going & I've asked him to repay this within seven days.

Does anybody have a recommendation for an architect or architectural technician in the West Surrey/East Berkshire/NE Hampshire area, who’s capable of producing construction drawings for a BuildHub-quality house that’s air tight with MVHR, please? I’ve just sacked the guy who was supposed to do this for me, after more than a year of low quality work, constant excuses & missed deadlines. I think this time, I want somebody who’s close enough to me for face to face meetings & affordable site visits.

The posi joist mfrs call those "cross members" strongbacks.

A friend has used this company twice & has been pleased both times. They've just fitted a long bi-fold run, separate slide or French patio doors (can't remember which) & 6 or more other doors/windows to his house extension. They supply & fit. https://truglaze.co.uk/ They're in Frimley Green, so probably not far from you. Please let us all know how you get on - I have a rental property that will need new windows within months (assuming the tenant moves out, as expected).