cheekmonkey

We're 5% on supply & fit as we're change of use from Agri to Resi. I'll be using the same contractor to fit: - Solar - Heat pump - Underfloor heating (from heat pump) - General Plumbing (1st & 2nd Fix) Am i right that 'renewables' are 0% VAT regardless but which bits fall into that? Do we need to break up the heat pump & underfloor from the 1st fix hot water etc? Does MVHR also fall into 0% VAT? (different contractor) Thanks in advance

i'd deffo double check the regs on DPC to outside ground level to be sure, our way around this is to bring block to finished floor inside & DPC outside, then bolt soleplate through above that. We will also run a 25mm insulation upstand at least 150 up inside the sole plate & SIP wall to avoid any condensation. basically i think bring your block up 50mm more & DPM/DPC works & then add upstand internally

You shouldn't really need 100mm blinding, but otherwise seems the same as we're doing. depending if the floor goes in before or after the SIP you can 'double bag' with dpm - so we're going to dpm & wrap up inside the sip as floor goes in later & therefore the internal dpm wraps up the wall inside too. don't worry about the bolts through dpm/dpc. it's all out the ground anyway. can't quite see the dpc layer on screen but i believe that needs to be 150 above outside ground level, it's not clear but looks like it is lower

Vertical larch T&G cladding - what are the options for detailing external corners? I have only ever done horizonal before & just fixed nice corner posts & run to that but trying to think of options for when running vertical. Our boards will be something 75-95 with shadow gap (not 100% decided yet) Keen to hear any options & photos if possible TIA

Ahhh ok - i see what you are saying... ours does not carry the walls. I maybe didn't make that super clear. The perimeter SIP wall will be sat on block/brick on a strip footing, the slab is just a slab From my original comments : "my thought at the moment is: - strip foundations with block/brick stub walls that the SIP fixes to."

@George so why is the raft a must? Why not make the slab structural, insulated & have the heating all in one like my idea? That way you have a nice mass to heat like Matt had experienced & ultimately a slightly easier construction as less process.

@mattman thank you very much for the detailed reply. I'm trying to get a all with the engineer today but i've spent a couple of days head scratching & drawing up a layup which is very similar to something I built myself before on a TF building (so really little difference to SIP). Interesting to hear you would try & incorporate to one slab if you did it again - that's what i'm trying to do else you end up with soooo much concrete for a really lightweight build! I've worked out that the floor has to go down before the SIP really as the DPM layer would have to be laid & ultimately would get trashed no doubt. There are risks of damage to floor so we will have to board over it but it definitely makes the concrete guys job easier as they would float an open slab. (have to pray for good weather but the last one i did myself i did in October & managed a reasonable finish to the power floating.) My plan/proposal for engineer is: 150mm crushed sand blinding DPM 150mm insulation slip DPM 50mm meshspacers mesh UFH clipped to mesh 150mm concrete powerfloated We'll see what he says. Really pleased to hear about the UFH experience you have too. We have circa 210m2 floor (plus integral garage but wont heat that) & expect we'll have a similar size heat pump to you for DHW & UFH probably jsut split into 2 zones for bedrooms & rest of house & probably similar size solar set up with batteries. We're used to living in old houses & think we might find the house quite warm without heating on. We will have MVHR also & a log burner just because we love the atmosphere & warmth from them. We're also going larch cladding, basically we're copying you . I was looking at standing seam roofing but our budget is already looking stretched & I might end up going metal sheet profile instead as I can fit that easily with some labour help. I pushed the button on the SIP build yesterday so that will work into slab detail & starting to dig some holes over the next month or so. I must start a progress post somewhere to stick up some photos Thanks again, great to hear such a positive experience.

@mattman i was about to post something later in foundations forum. we want a power floated concrete finish floor in our barn conversion but struggling to work out the slab make up that best works. we have a SIP build around an old concrete frame barn but it has a fair bit of proposed new steel work to hold it up. We have proposed ASHP & underfloor heating (single story apart from small mezz) architect had originally conceived a raft foundation but they expected us to screen the top therefore 75mm - talking to concrete people they say the top coat needs to be more like 150mm. they then said that they dont think that would work with UFH. my thought at the moment is: - strip foundations with block/brick stub walls that the SIP fixes to. (including internal walls) The steels bolt to these walls also, or small concrete pads - slab make up is then hardcode/sand/membrane/insulation/steel mesh/UFH (on top of mesh to in top part of slab)/150mm concrete that's power floated. All this can happen after the SIP is built so in the dry & won't get damaged after No-one seems to want to help advise what's best so i'm at the point to making the choices myself. Interested to get your experience on this & if you followed a similar make up at all. TIA Pete

@Alan Ambrose our failure is post planning. We bought the plot / barn with planning already approved and have only now started regs submission. Its rather silly application of new regs. If planning was granted we should build to regs at that time as removal of windows in theory is in breach. Hopefully find out more later today on options to try get it to pass.

thanks @Susie i'm waiting on a call next week to dig into it all a bit more. it seems basically we remove glazing using simple model (we're 4.2% over target on overall glazing) & we'd have to argue the open plan room bit as if they break it down as i've been told they do we'd never ever pass (it means we're like 50% over), or we have to suck up the modelling costs & as you say understand how likely we can achieve a pass with some mitigation like shading etc. I expect just taking into account the MVHR system might mean we pass but i dont know how it's calculated yet. another very silly BR rule. if it's hot we open the 10 meters of sliding door & the velux in the roof to cool it down!! madness

We used the following wording: This letter is notification of exemption of Approved Document R. The proposed dwelling is in an isolated area and is isolated from a relevant connection. Please see page 4 point 1.7 of Approved Document R Volume 1 2022 edition for further information, this is also quoted below. “Where a developer seeks to rely on the building being in an ‘isolated area’ as a reason to exempt new dwellings from requirement RA1, the developer must provide evidence in support of the exemption. This should include an explanation of how new dwellings are in an area that is isolated from a relevant connection, that the cost of providing a USO-standard public electronic communications network connection exceeds the cost cap and why the prospect of a connection to a relevant network in the isolated area is considered too remote to justify equipping the building with the relevant gigabit-ready physical infrastructure. The application of this exemption will vary in different circumstances.” We have attached screen shots from various major providers each stating that full fibre is not available in the area currently. And attached screenshots from City Fibre / BT / Virgin showing cant supply Fibre

I've just failed due to general overglazing % & also most glazed room, something to do with it being open plan & they then sub divide for calcs.... it literally is a BONKERS regulation for the most part. In theory in breach of planning if we remove windows. we don't want to remove windows! has anyone had any luck trying to use any software to do TM59 model yourself? I've been estimated something like £1700 to have it done!!! I've got no problem with applying mitigation measures within reason if that's the only way to do it?

Thanks for all the replies. The independent BC accepted the screenshots showing no one supplies to this area and therfore put it through as exempt. I'll probably put some duct in from plant room to the elec gates so can run a spare duct as a dbl back up. Job done hopefully 🤞

Yeah I had read it but it's so difficult to understand. As i said I read it that if planning was approved it didnt apply (same as how openreach word it) but who knows. BC have now said if we can prove gigabit isn't available we may be able to get exempt that way so waiting to hear response on that having sent a bunch of screenshots showing it's not available

Has anyone come up against the new Part R implemented 26th Dec 22? Our independent BC have said they need us to provide a connectivity plan for our new build but I've got lots of issues around this as no-one seems able to explain it to me in a way that makes sense Firstly when I read the Openreach website it specifically says if planning permission was granted before 26th dec it doesn't apply - BC are saying that's not right & that the BC application would need to have been submitted (have openreach got it wrong??) LINK TO SCREENSHOT in my head it makes sense that it's linked to planning else a change in regs could cause us to do work that invalidates planning for example. In our scenario planning was granted March 22 & we purchased & started work (demolition) this month (Feb 23) What even is a connectivity plan, what needs to go in it? I have yet to find an example to try & make sense of it What is gigabit ready infrastructure? Do i just need to show you can cable to the house from the road (i.e. chuck a conduit in the ground) or something simple? Or do i need to provide more complex provision with physical hardware? We are rural and as far as I have seen the nearest box with fibre is about 1mile away We currently have no phone line to our property (although neighbouring properties do have phone lines) & instead we rely on mobile broadband - is there a way to mitigate this all by continuing with that solution? (maybe 5g (we have 4g currently) It's really hard to judge if this is really nothing big to worry about & there's a quick fix mitigation or if this is more complex & no-one I'm asking seems to be able to explain it & help in laymans terms. If anyone here has experienced this & can help it would be great!