lizzieuk1

Hi all, Having thought we had the best option for our roof sorted with an I joist design we're struggling to find a supplier who can design & supply the I joists. We have loft rooms so need open spans Has anyone got any suggestions/contacts who can help? Our SE has designed steel ridge beams to support the I beams but need a layout etc sorting. TIA

Sorry, i meant fan coil unit!

Tricky to decide the best solution. If we go Air con then a. The cost and b. We're only doing ufh on gf so then no option for supplemental heating on ff&sf. Yes, ashp but installed quote for (8) heat coils is 10k! If its that much we could get an mvhr heat/cool module and as installing the ducting anyway can upgrade to 100mm insulated ducts. But, is it as good as heat coils??? How easy are the heat coils to install? How do you account for them on the ashp sizing?? So many questions.....

Thanks JohnMo, all good info. Wonder if there's a way of dehumidifying along the route to help the cooling?

Yes, we are going to look at external blinds - still in early stage of costing these, but had experience of them at my parents place in France so know they work well. Good to hear the mvhr has helped - the Zehender comfoclime looks interesting as can actively cool or warm incoming air which could help fill the gap of wanting some comfort cool/heat on ff&sf rooms.

Thanks Mike, we're not too bad on the calcs for Overheating- just a small loft room that needs an extra 10L extract to pass. Roof will be blown cellulose & we've no huge areas of glazing. We will use the ufh on gf to cool but have 3 floors so wanting to get something on ff & sf if we can to offer a bit of extra heat/cool if needed - 8 heat coils installed coming in at 10k on first quote so feel there could he a better option!

I know previously it wasn't especially useful but wondering what the new offerings are like. The Titon Cool plus Q has a 3.3kW total cooling, or Zehnder ComfoClime which has 1.7kW cooling and 1.7kW heating. We were looking at heat coils for heat/cool on ff & sf (ufh on gf) but so far at 10k install that feels pretty steep! (Would be 8 coils to do so quite a few and not sure if we can do the install though still investigating that)

Thanks Nick, I've only had a rough overview cost so far, we thought it was quite cheap as well. From memory (bit hazy though) I'm sure he said they use 50mm ducting which rang alarm bells for me straight away! We're pretty sure we will self install a system now to both control quality and cost, also think we are wanting to add in some comfort cooling/heating so into the realms of insulated ducting etc.

Thanks, that's all helpful info. We are weighing the options on install - happy to diy it but equally if the installed cost isn't much more then will go with that (we have lots of DIY to do on this one!)

Thanks, good to know. How does £8.5k sound for full supply & install (for ref its 420m2, 3 storey house) One worry is I'm sure the guy said they use 50mm ducting, which sounds rather small but I may have misheard so will check!

Morning, Ive no real experience of mvhr and its a bit of a minefield, so wondering on opinion of the Ubbink systems, are they good or bad or other?

Are you doing the blown cellulose yourself? We're hoping to self install so interested to get some info if you are. Watching the video of a U.S one they use a semi transparent fabric (like the ones under sofa bases) stapled on then fill. I guess you'd need to fit an air tight membrane after that though.

Feel I should know the answer already but can't seem to settle on one! Ideally, wanting to do our own ufh and solar install and, if possible, source the ashp/cylinder etc and get local plumber/sparky to install, sign-off that and necessary solar bits. My confusion lies with getting our bc sign-off if the ashp & solar isn't mcs installed. Our last builds we had mcs installs and handed certs to bc so all easy but, far more costly for our own home build that we need to budget far harder on! What are the bc 'hoops' required for that sign-off without mcs certs?

Resurrecting this a bit. Looking at the website it seems you jeed a few 'extras' to do this via self install. How did you manage those?

Yes it will be once the new one is built.