PeterW

Spit gun will do it but you need to wear the PPE, and preferably be trained. They are a borderline firearm and can be dangerous in the wrong hands. Safer option is self drilling screws which will are easier and simpler as long as it is not load bearing.

OK so the thermal expansion of screed is negligible between 5 and 35°C to the point it is barely measurable. Over an 8m slab you will get less than 2mm total expansion which will easily be absorbed by EPS.

So the calculators all assume 50mm cavity which you don’t have with the solution there. Why not go with 125 or 150mm cavity and then use full fill blown bead or similar ..?

After watching some of the rubber roofing contractors doing big commercial jobs, it isn’t something I would take on for the risk as any leaks are notoriously difficult to find. You may also find a house insurer for a build that has more than 10% flat roof requires the roof to be backed by a guarantee too so you can’t rely on this.

Change your BM. It is a standard product that is available everywhere - just check your local Wickes for stock as a 150mm upstand basically needs one sheet for nearly 20 linear metres of EPS so you don’t need that many sheets. https://www.wickes.co.uk/Kay-Metzeler-General-Purpose-Polystyrene-EPS70---2400mm-x-1200mm-x-25mm/p/210823

Lead times …? It is a stock item in 99% of BMs including Wickes … Ripping it down will take minutes with a hand saw and a piece of 6x1 - it doesn’t need to be perfect.

Just use 25mm EPS and be done with it.

OK - unless you are going to be in an area north of the Norwich / Birmingham line, and preferably much further north still, your budget is not achievable. If you want the off grid / sustainable smallholding type property then it’s not practical or possible in the south of England as land prices are too high. A standard 1/6th acre plot will cost you £2-300k in the less desirable locations (ie not near major transport links) and you are highly unlikely to find suitable agricultural land packets that can also support a property. Your £500k will go a lot further the more northerly you go - what is tying you to the south ..??

Rads could be thermosyphoning off the return or even back flowing. Have you checked if they are not actually piped into the DHW run as some older houses had the bathroom rad on the heating circuit.

There is your reason. Mitsubishi recommend 22mm or even 28mm primary pipe runs. Is this a retrofit for a boiler or a new build..?

JJ Crump are in Newton Abbott https://www.jjcrump.com/cavity-wall-insulation/

Ok but there are very specific rules about self build VAT reclaim for families and without following them you can get into a world of pain at the end. Have a read through the notes in the VAT section of the forum

No this will get complicated. There are rules about building for family and who claims what, and that’s assuming these are new build not conversions or restoration unless they have been unoccupied for a number of years. Need to get this right from the outset as it could cost you ££££

Whos name is the PP in for the VAT reclaim at the end ..?? And who’s going to live in it ..??

Why are you planning for something that will not be needed for 40-50 years ….?? In that case you’re qualified to answer your own question. If you can’t, you’re not qualified to do the wiring.

Got one, it works fine and RH in the property runs at about 52-62 with it. Quite a lot of others have them too.

This is the clue - have you told the other party ..?? They will have a liability too and want to ensure their asset is in good condition. The developer has a duty to repair and I would want to get this done asap.

But MVHR moves tiny amounts of air compared to a dehumidifier. You need to start at the basics

This is a red herring ..!! These work by allowing RH from the extract to the intake but it is at a level that is balanced by the internal level being extracted. Good explaination here. https://www.paulheatrecovery.co.uk/components/moisture-heat-exchanger/ I am wondering if you haven’t got the proper flows and you need to balance the system and also need to get some industrial level drying like others have said - a new build contains hundreds of litres of water, I would start by drying out what is there, balance the MVHR and then see where the levels end up.

So the detail doesn’t meet the plans - floor build up is different to start with than the section drawing notes. There seems to be a number of retaining walls which makes me think there is a level change somewhere on site - that will also give issues with muck away and leveling. Also worth noting your Architect has put a note under the GF shower room about having doors opening outward to meet Part M BRegs, then has drawn it opening inward ….

Without seeing plans it isn’t that easy to comment however the quote should be zero rated for VAT as this is a new build.

Just as an aside, hitting tempered glass on its edge with a block and hammer is a very bad idea … you can set up stress within the glass that will shatter it at a future point. If you need to get glass into a rubber seal then use a good water based glass cleaner, spray the seal liberally and the glass will slide into the seal. If it doesn’t, then you can use silicone spray on the rubber but it is harder to get it off the glass.

As long as you have all the data, with the correct scales, and it is fully annotated then a single page is fine. I would say though that harks back to the old school A0 architect paper plans and not the more recent CAD where everything is in different files

Rough order dimensions are fine at large scale for plots, but you should always add a visible scale (inc a scale identifier) on every plan not just the “1:50” etc in the drawing block for the detail drawings.

Yes and yes … you can buy your standard plot maps cheaply online for about £25. They are part of the statutory response so required. In terms of elevation detail, you should be able to get a sketch plan of the elevations pretty easily done as they are just block boxes - no need for immense detail other than of the changing items. Photos in applications are always good - helps focus on what is changing etc