Russell griffiths

Well that depends on what you are building. a quality house for you and your family. or your general standard developer finish. the former will require a robust ventilation system. the latter will not as it will probably have trickle vents and extractor fans. if it’s highly insulated and a good airtighness then you have no choice. just past building regs with insulation values then probably no need. just depends what you are trying to achieve.

Oh Lordy. You had better think about that quickly, it needs a massive amount of room, you can’t just stick it in a 25mm void, it needs 100mm clear space under that floor for it.

If he’s a good carpenter he should have a dust extractor fitted to his tools, there should be minimal dust if this is the case. Ask him.

Do you not have MVHR.

Cons, you will probably need a crane to install beams or planks. So £6-700 for that, unless you can get a big truck with hiab. 100mm void needed below for ducts.

Have you got a digger, make a pair of timber tongs for a mini digger, short bit of chain and tongs.

My Graf unit comes with a computer control working the timer and pumped outlet. It runs for 6 mins on 4 mins off, I was told having it off for longer there is a greater risk of sludge blocking the holes in the air tube.

The steel will have a large foot welded to it, like a 12mm plate, this extends over the cavity and onto the outer brickwork.

Not if you want to get out in a fire.

That’s a dog shit finish, sockets should have been unscrewed and then masked as well. You would only paint around if it was a moody rental property.

He’s looking rather grumpy.

Easier to get a truck that mixes-on site, you will need two fit helpers and 3 barrows. Will be about £550 plus vat.

Your building a house, not a patio, why are you talking in 800kg bags, you get 3 15 tonne truck loads at £450 a truck. Stop thinking Like a diy bloke and think like a construction guy.

Tell nobody,

Most screws work, but avoid very cheap ones, normally £20 a box roughly.

Buy a roll of packing banding. 1000m roll is about £30 then a good quality staple gun. run a row of banding on face of joists, have others pre cut put insulation in and staple a band over it. I did 355m on my own like this.

Instead of fitting a pre formed tray and filling in the edges, why not buy a tray former that is too big and trim it down to get the waste where you need it.

If it’s a new build you shouldn’t need to raise it at all, there must be a way to get the waste out.

Xps high density foam, or get a sheet of marmot board and cut up, or buy the shulter curb.

Have done a curb previously, which was basically a row of bricks, then screed inside to the required fall, then waterproof system on top and over the curb.

With a budget of £150 you need to do a lot yourself including design, get all your ideas down and talk to them. That budget will just get you the extension, don’t waste it trying to get an award winning architect to come up with some fantastic design, it will just get your hopes up for something you cannot afford to finish. Keep it simple, nice family area, good working space, no fancy things and you can do it. But get carried away and your budget will disappear by the time you have a shell up.

What do you mean by cold bridging, your windows will certainly be the weak link in the insulation game. However you will probably get more overheating problems with that much glass as opposed to heat loss.

What on Earth are you doing, I can do a full days work on one 4 amp hour battery.

Ducting for what, mvhr, or to run cables through??