Adrock

Nothing at all. It's brilliant from that perspective. It's more about the hollow sound from the plasterboard ceilings within the room.

Heh, I probably should have clarified and started my own thread. I was asking because it's my basement and I'm using MF ceiling.

No floorboards, my ground floor is a reinforced concrete slab. Fixing it up high still as effective? I suppose it is the same as walls and the drum effect I've read about.

Very is good enough for me. Just need to spend more and get covered in horrible fibres again.

Sorry to hijack the thread, I'll be doing a few MF ceilings in a few weeks. How effective is the ceiling acoustic insulation?

It's, unfortunately, the industry we work in. All the years I was on the tools and then project managing I got known as the perfectionist on the firm. In my humble opinion I was just doing things as shown on the drawing. And that was in healthcare as well.

Sorry, I failed to explain myself properly. I'm thinking 2 x MVHR due to the way the works are being carried out. It'll mean I'll be able to have one in operation relatively soon whilst the other can be an addition if I ever get to refurbishing the upstairs and doing a loft conversion, it currently feels like a long long while away. Is there any reason why I couldn't combine 2no. exhaust into 1no. wall outlet and the same for the supply air? Might even get a fancy plenum made up.

I'm in Hertfordshire. But in true self build style, it'd be nice if there were a way of doing some interim self testing to make sure nothing is being missed.

Slightly off topic, but can anyone point me to a resource on airtightness testing? As for the MVHR, the domestic market doesn't have a big selection of ceiling mounted. I have a decent 350-400 void in the basement I could have maybe used. Any reason why I couldn't combine the intake and exhaust outlets at the external wall position to prevent two sets of two ducts through the walls?

My dilemma is half of the house won't be ready to install the MVHR system into for at least two years, this is a long term project. I don't suspect a company will be willing to come and install piecemeal. Which is why I was clear in my initial correspondence, the quote seems like a rough and ready count and budget thrown together to get me off their backs after I chased for a response.

That's an interesting article, thanks.

Cheers @JohnMo, I'll give that a read. I'm going to have a play with my house plans over the next few days and I'll try to remember to share the drawings. All opinions and input is valued, it's why I keep coming back with my problems. Just imagine if architects could actually have these kinds of details as standard.

I've almost certainly gone too far down the airtight rabbit hole to consider trickle vents now, I have two new windows and a door installed which don't have them. MVHR is going to be the answer. After that quote I think I'll definitely be doing it DIY though, like almost everything else in the house. Time to build a bill of quantities and spend some money.

Materials are £10k and install £6k, the house will be just over 200m2 across four levels one day. Plenty of work to get there though.

It's a shame I'm living in the bloody thing, I'd love to be able to use aerobarrier I'm going to have to try and do it on a floor by floor basis, I think. Once the basement is done I'll move onto the ground floor and strip it all back, that might provide an opportunity to do what I can do, test and then if needed, get aerobarrier in to do their magic.

Cheers, I'll take a look at that. I got a quote back today, seems expensive.

Yeah, I'll need to be looking at lots of airtightness details internally if I can't do anything externally. I'm not doing this on the cheap so it's definitely going to be airtight when I'm finished.

Thanks, any recommendations? I suppose my main concern is the placement of the room outlets, are there any specific considerations I should be mindful of?

Yes, airtightness is a feature of what I'm planning. Everything to do date has been detailed for a high degree of airtightness. The house is of solid masonry construction and will be externally insulated in future. Hopefully that'll afford me the opportunity to get as airtight as possible.

Thanks, I'll look them up. I'm in the process of doing a whole house renovation and I suspect I won't be ready for everything for a very good while. I might split the the basement and ground floor to get something on the go but that will still be a year in the making.

Cheers @Nickfromwales. I'll chase them tomorrow and if they can't accommodate me I'll get onto BPC and see if they can help. I'm happy to pay for a design if it helps.

Another thread to add to the multitude! I need a design for my house, I'm happy with installation and construction but I'll need duct sizes and some direction to how I'll get over a couple of tight spots where I have under 90mm from bottom of steel to finished ceiling. I contacted CVC systems over a week ago and the initial emails were very responsive, but nothing at all last week. My situation, which I was very clear about, probably contributed to it. I won't be in a position to purchase or install the MVHR for probably a year or so, but I need the duct installed in the next few weeks. Are on you lovely folk able to point me in the direction of a decent resource to enable progression of the design?

BCO have asked for it, including the basement the house will end up being four storey by the end of the project.

I'm in the process of encasing structural steels within my basement with fire board. How do I continue the fire protection where the steel has a timber bolted into it? Hopefully the picture below helps to illustrate what I'm asking. I'm thinking infill those sections between the joists with pink board and then more pink board to the end of the joists hanging below the steel. Thoughts?

Thank you very much everyone. @SimonD you've given me an insight into what it takes to design heating and dhw pipework. I should have probably expected that considering my day job is similar, just on the electrical (better 😁) side of the game. So, my take away from this recent discussion is 22mm copper is sufficient for the actual load of the building. I just need to work out the index circuit and see how those figures all sit together. If the pressure drop is too high a bigger pipe would reduce that but the velocity would still be low, right?