LA3222

I waited a few weeks with mine, I got a dehumidifier in aswell to help and monitored humidity levels. You'll be surprised how much moisture is in it - I did a dry mix but the sand still holds a hell of a lot of water in it.

I cant recall as it's so long since I last looked into cedral but I thought the required ventilation gap was significantly more than the 10mm you mention - I have 50mm in my head, but I may be wrong! Just checked, it's 30mm behind planks.

Yeah, I may be wrong but I think it is @dnb who is building in the IOW? There's definitely at least one on here doing so.

I paid 6k for a 300l preplumbed UVC and an 8.5kw ASHP. Looks like you are paying 9k for the RHI. Will you really get £1k back per year, whilst also saving 60% on fuel costs? Smells like bullshit to me. You are replacing an LPG setup, so I'm guessing not a new build? What is the fabric of the house like? If its like a drafty sieve then your ASHP will be running all the time and you definitely won't be saving any dough, e lucky if you don't find yourself with higher energy costs. To my mind ASHP are good, but only in the right setting. We'll insulated, air tight home, preferably with Solar PV. Of you don't have those I would reconsider.

Prize goes to @Bonner, nailed it.

This may be a daft question but I figured I'd ask anyway?‍♂️ Close to finishing up the system and will need to fill it all. UFH loops are full, got a a 100l buffer and was thinking to just pour 100l of glycol into there which is the amount the whole system wants. Then turn on a few pumps and let the AAVs bleed out any air? Is there a better way to do this?

I'm pretty sure this came jumbled up amongst the bits and pieces for my ASHP and Cylinder but I have no idea what it is or its use - any ideas? Almost looks like a bracket of some description but it's flat?‍♂️

That is pretty much as I thought. Flushing needs some proper kit, all i intend on doing is a rinse through at mains pressure. Cylinder came pre plumbed so most of the plumbing is compression/push fit, not much in the way of soldered joints.

Still struggling to understand why people use buildstore, absolute waste of air?‍♂️ Ecology.

That sounds like a lot of effort. You raise something I hadn't considered though, what is a reasonable effective life span of the antifreeze mix?

Right, what's the crack with this flushing malarkey? All the instructions for UVC and ASHP go on about it to clear crud, debris etc. Does anyone do it? Will a flush through with mains pressure water do?

Rather than all the guessing, either ask the builder to show you what he used or go looking for rubbish - I'm guessing there is a skip knocking about?

Ecology. Nuff' said.

No coil, all the ufh and ashp fluid is connected. I think it is both hots at top, was just having a brain fart!

This may seem a daft question but I need a sanity check! Bought a 100l buffer tank. It's git two connections near top, two near bottom. Now, clearly warm water rises so, UFH flow from a top connection, return into a bottom one. ASHP flow into top connection and return from the bottom? So sucking the colder water from the bottom back out rather than the warm at the top?

@SuperJohnG don't over think it bud, it's easy. I used Intello products. I used the intello plus membrane with the tescon vana tape. They do a double sided tape too. I ran strips of that along the wall near top, middle, bottom so it would hold the membrane temporarily. Then used the tescon to seal it to ceiling, floor, windows etc. By time you've done that it effectively takes the weight. I would then batten the wall so it pins the membrane in place. A couple of times on sloped Ceiling and one wall I didn't batten straight away and the membrane sagged which was a bit of a pain to re-tension. I used orcan f in joins such as membrane to concrete slab, not really for that but I used it that way. Around joists, studs etc its a pain. Just a case of suck it up and use lots of tape. Don't underestimate how much tape you will use, I think your build is a similar size to me and I think I used over two full boxes (think its 20 to a box iirc). Try and source it all from Germany, it's far cheaper, they stopped exporting to UK just after Brexit, not sure if they have resumed? If they haven't I would almost say it's worth a trip to Germany as I think there's a couple of thousand in savings to be made potentially.

There's a chimney on my house plans, nay fooking chance that's getting built. If someone whinges I'll deal with it then.

Yah, there is a prv in there...caught me out as I wasn't expecting to see one there. I'll have another look later to see what the crack is, saw the red cap and was a bit puzzled as I'd not seen it mentioned previously.

Noticed a PRV in the ecodan ASHP unit when I was messing around with it the other day. Didn't expect to see that in there, how do people normally finish these off? Stick some pipe in to route out from ASHP and insulate?

Does anyone have a buffer tank they can recommend - looking for around 90l and direct. Current thinking is to fill the ASHP and UFH loops with an antifreeze solution so it can all run together for ease.

Why not put the pipes in and leave them empty? I didn't pressurise mine for the concrete pour. Dont see the point. The pipes are pressurised. So when you lay them and snip the end you will hear the air woosh out so you know there are no issues while you laid them. During the concrete pour, a pipe loses pressure for whatever reason, what are you going to do. Nothing. You'll finish the slab and have to sort it out later. Some may say pipe need pressurising to expand so that they aren't restricted by the concrete when in use. Really. Just how much will a 16mm plastic pipe expand across its diameter in use at 30 degrees tops. I'd say feck all. Lay them dry and leave them be?‍♂️ N.B. I laid mine dry and have the UFH running at 30 degrees, no splits, dents, cracks, corrosion as they say - and no noticeable rise in pressure due to the pipes being strangled by the concrete!

^^what @SuperJohnG said. Screws for SIP.

Plasson for external, Hep2O internal

I'd be inclined to start sending some Mr Whippys through, may get them to rethink their strategy and fix it schnell machen?‍♂️

I sympathise with your situation but I find this extremely difficult to believe. Whenever I get an email from a supplier I always open all attachments and have a mooch through them. They are sending you them for a reason. You may be able to argue this but it seems dubious to me - I'm no legal expert to be sure?‍♂️