saveasteading

I agree that it technically isn't essential for strength, but i would do it, even in my own building with my own supervision. A marginal decision though. This is because it is close to impossiblle to lay and compact stone level and smoothly enough. Even the best laid Type 1 will have undulations, and then need sand blinding to be properly flat. Blinding needs to be ultra-thin or it gets footprints and other indents. So i would lay at least 50mm of concrete with fibre addditive as long as the labour is skilled enough to make it flat and smooth. In real life the loads in a domestic situation are tiny enough that pir does not crush, and will probably bridge small dips in concrete or hardcore. In theory i might accept pir straight onto stone if the method and skill levels guarantee a level surface. Blinding smoothed and membrane on it, planks for movement, pir laid immeduately and progressively, planks on top again. Top membrane is essential with liquid screed over pir. Not with dry screed, but the cost is tiny.

In Scotland no. They want a full design. In England you can. The choice is "full plans" or " building notice". For the latter you really need to be completely on top of the design, because there is more chance of discovering challenges late, or simply not optimising the design. Under full plans, the bco might be OK with a few details following, but you shouldn't count on it.

Or a garden weedkiller in a garden spray, as they can usually scoosh further. . Do NOT use a pressure washer or you could lose the render.

How vague can it be? claim sparked, alleges, allegation, persons unknown, approached, revealed. Is there a journalist dictionary of words to reduce credibility? not a single concrete detail.....I forecast that this is a non story as click bait. I think I heard that somebody was said to be possibly alleging a rumour that is apparently something about corruption somewhere....maybe. 3 x half a mil bribes.....these must be rather large projects, if not imaginary.

It's all above already I think. CDM is keeping people safe, including yourself. Do risk assessments. What might go wrong and how can I reduce the risk? If you happen to write it down, then you are giving yourself some cover if there was some unfortunate and reported injury. If the HSE rules say that you should register it, then you should. If you have contractors then they should have risk assessments, and be able to give you a copy. Of course we know that most little guys don't. As an amateur, do you insist? probably not.

Over 4 degrees and it's ok. If there is cement in the product then it is a chemical reaction, not drying, so this neds to be for at least a day, including early morning frost snaps.

But Spanish renderers and tilers are superb, and that would end up looking good....but they don't have our weather in areas where they do it like this.. RE the original question, that wall will get weeds growing from the open joints so I think it could cause problems all round.

Excellent. Did they get special rot treatment or is the solum guaranteed to be dry? Osb webs or steel frame? Made in Elgin so localish too.

Looks like standard Spanish construction. The renderer sorts it.

Agreed. Such buildings with big spaces have very varied use. They take a long time to heat up for perhaps a short activity. At the parish council everyone is sitting and needs warmth. The badminton club don't need it, but will turn it on anyway. In sports halls we used a big black tube in the ceiling that fired gas, and invisibly send IR down on the users. Teachers told me that they very visibly turned the heating on, the pupils immediately felt the heat, and then subtly turned it off in a half hour. But it can be kept on as necessary and gas is cheaper than electricity. But for a village hall I'd think electric can be considered and the ' visible heat' is a selling point.

There are systems where a netting is applied first, with screw fixings, then the render sticks to the board enough, with the additional support of the mesh. Very expensive but it works and I would not advise any other way. Or apply sods law and spill paint or render on it accidentally, as we know that doesn't come off.

You could even have one on the road feeding another half way. Or a couple of dump trucks.

@HighlandHopeful you see already how much sound advice is available. Tell us two critical things please. What access do you have? What are the ground conditions?

An aside perhaps. In my experience of these floors, the concrete beams are ultra hard, and drilling requires that you don't hit a steel tendon. Did you use short screws? And they have a camber to the centre. Yours don't appear to have this camber, but perhaps you packed the battens?

Yes, I was assuming that those aluminium rads with prettier shapes and fins will have more surface area for a less huge rad. The main issue is the sizes of rads required in any material. They have to be very big as compared to rads with much hotter water from oil or gas, and a lot of wall is needed. I suppose that can all be carried or barrowed up a track where a lorry can't go. And the footings mixed on site x 100 or 200 mixes, and barrowed to the hole. Dry mix likewise. I've seen an 800m2 floor done in dry screed. At least the guy knew what he was doing tomorrow...and tomorrow... UFH would be perfectly feasible.

Were there any issues that now concern you?

A roofer will know more. However my thought is that these are lots of drips at nails, ie through nail holes. There isn't a great distance upslope from tile bottom to hole and the tiles are flat, so it could be capillary action plus wind. Do nails show through the felt? What is above the felt in the way of battens or board?

A hood exercise is to think how best to set a fire going at every stage. As a scary example a client had vandals (local kids for fun)) pile up bags of sawdust against a wall and set fire to it. Unlikely to happen, but that's the thought process. Re cavity barriers...if air doesn't flow then fire doesn't spread. It doesn't have to be £21/m. A stack of timber won't blaze, just the surfaces. Keep it tidy. That's the clients job isn't it? Nobody else will. You haven't cleared up your wire ends. 'But they're in sawdust and that's not ours.'

A picture ? To a 110mm pipe you can cut cement board exactly and either slide it over or half it and push on from either side. The others could perhaps be clustered through another pipe as a duct, and the gaps infilled / sealed.

Sorry, but that floor construction doesn't seem right to me. Are you trying to invent a method from scratch? My garden shed has a 100mm concrete on earth. For a house as an absolute minimum, 100mm stone then 100mm concrete with mesh, then dpm. after that a timber batten base still feels like a shed to me. THis sort of detail did exist in the distant past, but really isn't right. That's without knowing your site conditions. What is the ground? The U values is way down the list and can follow on from agreeing a structure that will last more than 30 years. So, can you go back a few steps? What is the access for materials like? What is the ground? What is the intended construction, in principle not detail.

It will but I don't think it is available. The aluminium product is moulded so that the ufh pipe clips into it. can be painted. We don't do family relationships and politics on here. But the appropriate radiators are made of aluminium too.

Tell us more please. The foundations and floor will be made of???? other lorries can't get there either? A bracken on earth floor, driftwood walls infilled with heather and mud. Thatched roof harvested adjacent? OR small loads of concrete. pumps. dumpers.

wooden floors is not a problem, unless very thick. Rugs likewise, as the heat will move on and emerge elsewhere. Carpets no. On our latest family project for the rooms where ufh isn't appropriate I am pushing for aluminium skirtings with the ufh pipes in them. No clutter. But you could still put rads in these rooms. 'They' want you to buy bigger kit so push us in that direction.

Welcome @HighlandHopeful I agree with @ProDavethat UFH is preferable to radiators. The radiators would have to be very large areas when compared to gas or oil fired, which run at much higher temperatures. Also I think they are more expensive than the basic steel ones. That goes a long way to equalising the cost. That is something that needs more local knowledge perhaps. How many days of not quite enough warmth do you tolerate? Plus there is the comfort issue. Warm feet makes you feel good, and so less energy is needed. And of course you are walking and sitting down there, not on high. You are going to have a lot of heat rising to your exposed roof. It might be worth sucking it back down. Also that is all the more reason for having good roof insulation. The invisible benefit is the absence of rads and pipes on the walls. The heat loss calculation is simply a function of area and U value, so you are on the wrong track. Roof, walls, floors with adjustments for windows etc and it is done. What constructions are you having,, if decided? I am sure one or more of us can send a spreadsheet for this... I'd have to find one of mine somewhere. Controversially? Do you need forced air changes? You have a very big volume and 2 of you. You will be opening doors sometimes, and the cooker hood and wc fans vent whether you want them to or not. I am not convinced they are an essential , have pushed my luck (with client agreement) on much more sensitive buildings than this, and had no issues. Excellent. we may have questions back to you. Car radios a speciality? Have a first heart in anticipation.

I once condemned some plumbing that was a total mess. How long have you been a plumber? Since last week.