Oz07

Ask AI what the payback period will be 25mm PIR is expensive for what you get.

Get some terriers. @Nickfromwales made me laugh you're on of these people we laugh at when we see a clip online of seagull nicking your chips. Why are you constantly targeted by them? 🤣 need to be on your guard more. @ToughButterCup this is what worries me about airtightness relying on hard to access membranes. A ceiling one is not so bad if can be accessed from above but a wall one sounds a nightmare to get to.

Think severn trent ask for 750 min here. Then their boundary boxes struggle to go that low.

Not meant as a dig @Gus Potter but would you agree that a house can be built without SE input? Not this particular house or this particular scenario nessecarily. Or would you say that every house built needs SE input?

Hear hear! In every industry. Hopefully a massive recession happens and we wake up and smell the cheese

God what happened to the future and the age of abundance. I'll deffo be putting aircon in my next place and I dont consider myself extravagant.

@Indy https://forum.buildhub.org.uk/topic/43530-mvhr-who-needs-it-i-dont/#comment-611326

Where is OP Cornwall?

I don't think they are mandated. I've had air scores lower than 3 in houses before and nobody has ever came along and forced me to have one. There's no mechanism to, unless the bco is very switched on. Besides isnt it mechanical ventilation which is in the regs not nessecarily mvhr? What's all this Dmev stuff you hear about? You're in the m&e business can we trust your impartiality here 🤣 I'm just saying I've lived with one in an airtight house and without one in a house with a score less than 3. Its just my personal opinion, nice to have but windows also work. Are @ToughButterCup and @nod nuts too?

Its unfortunate isn't it because they're a good window to have in summer can get some natural convection going.

The problem i have with this is everyone who says it has spent thousands on an mvhr system. I had one in our last place, the air was a lot drier (too dry really) and it was nice cleaning the filters and seeing all the muck its taking out the air. I'm not sure it was worth the investment. @joe90 used to turn his off in summer, @ToughButterCup hadn't bothered with one last time I heard and serial self builder @nod never bothers, but then his motives might be different! They are a nice to have and I will probably have one again in next place but I think you'd enjoy the comfort an aircon provides a lot more. How much would it be to first fix the pipes for the mvhr then make the decision later, the unit is usually the big ticket item but probably not if your having to pay labour on the install.

Yeh just had a look. They seem good. Thin bars, butt joints etc. 1.2 u value as well. What's the pricing like compared to timber?

Am I the only one thinks that would be pretty cool?

Are there any decent makes of sash windows in upvc with good u values? All that I've seen look too chunky. I would wonder how good the window performs with seals as well not having as much compression?

I'd say its a bit too late if manufacturers and engineers have been consulted. In the real world this is what would happen though. You'd be pissed off with whoever did it mind.

Yes on concrete / screed in an older house. SLC beforehand No it had a dpm, then an underlay and then the flooring. All the joints were glued so it just floats as one large floating floor.

Presumably full fill too? You can buy those cavity sure trays if not now which give you a guaranteed 25mm or something clear cavity.

The ones I did were floating on an underlay. It was just the joints that were glued to create a floating floor

Won't work on concrete though. I've done floating timber with glued joints before now.

I think timber frame and block cavity are easy with finance. You'd have to check with CML or uk finance whatever they're called now make sure the majority of lenders are happy

Not as good for finance or future sales purposes I think?

You can still full fill up there then? I thought it went on exposure zones? The stuff is deffo water repellent. An offcut can sit in a puddle for a week and is no heavier for it.

Ive had pumped before and slabs. Id be interested as to what is better around cavity trays. Do pumped beads or dritherm work their way around all the folds and lintels? Pumped used to be cheaper at one point but then slabs became cheaper again. I find its easier to keep cavity clean of mortar with slabs. The compo just drops down onto last row of bats and clean it off. When you have an open cavity it drops right down to the bottom.

@Gus Potter i think there are a lot of items in your list that get copied and pasted between jobs with tweaks. For instance design and access. Moving forward maybe AI will also cut the labour involved in design and access down too? I've never used an engineer to set out or survey and have built a few houses now, just use the OS maps. Even though I've never been quoted fees as a % it is relevant because in your example 9k on a half a million pound house is a lot different to half a million on a 2 million quid house. The uplift in plot value on the planning permission will be a lot more.