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IanR last won the day on August 16 2024
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Type 1 won't stop water "percolating" beneath the raft, it will just drain more slowly and wash out the fines as it drains away. For an insulated raft the EPS would typically sit on a "no fines" pea shingle or granite chippings and there'd be a perimeter drain to aid water clearing. If you have a high water table, or it's temporarily high through surface water flooding then the water will breach the EPS, up to the DPM. Any EPS sitting in water is no longer acting as an insulator. The section I included in your other post shows this. Has your SE got experience of insulated rafts? There should be no issue contracting out the Engineering of the raft to a specialist and have your SE do the other details you've hired him for. Do you know that you can get the formers you need (or at least make it much easier) to create the ring beam detail with the specified insulation? It can be a bit of a closed shop where the insulation providers will only supply the "approved" formers for an Insulated raft that's been Engineered by a company they have a relationship with. Are you hoping to have a building warranty? Will your provider accept the raft design? And will Building Control accept it?
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It is now mandatory that the land owner is notified if someone else submits an application for land they own and an Ownership Certificate should be submitted with the application, confirming the appropriate notice has been served. It's an offence to complete a "false or misleading" Certificate. Without an Ownership Certificate the application is invalid and should not be determined by the LPA https://www.gov.uk/guidance/making-an-application#Ownership-Certificate-and-Agricultural-Land-Declaration Object on the basis of the missing or false land ownership certificate.
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That's right, no clips or straps, just nailed.
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Mine was like this, but with packers between the flanges where the load is taken. Design: Cuts: Installed with packers:
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My SE is recommending I do NOT embed the UFH in the insulated slab...
IanR replied to zzPaulzz's topic in Foundations
?? All available over the counter at my local plumbing outlet. Pretty standard size across the Continent. -
My SE is recommending I do NOT embed the UFH in the insulated slab...
IanR replied to zzPaulzz's topic in Foundations
The Thermotech pipe helped here, it's very robust and doesn't kink. It's Ø17 polyethylene which won't damage from the mesh being trodden on squeezing the pipe. -
My SE is recommending I do NOT embed the UFH in the insulated slab...
IanR replied to zzPaulzz's topic in Foundations
Insulated Rafts remain pretty niche in the UK, so you'll not find a standard way of incorporating UFH. They are however quite standard in Sweden, which is where Advanced Foundation Technology originate from. AFT Engineered and supplied my insulated raft including UFH from ThermoTech (Sweden) - Olof even dropped by to help install the UFH. The Swedes do their UFH a little differently to the UK but they take their plumbing very seriously. -
My SE is recommending I do NOT embed the UFH in the insulated slab...
IanR replied to zzPaulzz's topic in Foundations
Is this an early "conceptual" section, or the finished design? I'm surprised your FFL is not at least 150mm above the outside ground level. It's also an untypical sub-floor build up, there's no perimeter water management and a lack of insulation "overlap" where the raft steps from floor thickness to the beam thickness. What insulation and thickness is being proposed? My raft from AFT is doing similar to what yours is trying to do, but looks more like (but not identical to): Ref. https://www.advancedfoundationtechnologylimited.co.uk/our-products/passive-building-foundations/ -
My SE is recommending I do NOT embed the UFH in the insulated slab...
IanR replied to zzPaulzz's topic in Foundations
Can you clarify whether you are having a slab or a raft? Typically a slab is poured inside of strip foundations and isn't load bearing, where as for a raft there are no seperate strip foundations and your load bearing walls sit on the raft, passing the loads into it. My answers below assume you have an insualted raft foundation. What flow temp is he considering? Has yours been calculated? If you are at PH levels of energy loss then flow temps are likely to be <35°C. Typically the raft temp will only be 1°C or 2°C above your target air temp, ie. 21°C or 22°C. I see greater increase in raft temp from solar gain than I do from UFH. My raft is 465m² and I have no cut joints. Agreed with regards the repair, but not that high stresses may cause a burst. I did have to repair an UFH pipe, as I cut into it. My pipes were on top of the steel mesh and it was relatively easy to expose and repair. Why are you having a screed? Perhaps you should list your floor build up. Typically an Insulated raft only has floor finishes above it. -
Fabric and ventilation heat loss calculator
IanR replied to Jeremy Harris's topic in Heat Insulation
Having played a bit more I can see it's not doing either of those. But, while it's getting the Total Energy losses approx. correct, it's overstating the kWh.m².annum by around 200%. The extra is mostly in the shoulder months and summer, although December, Jan and Feb are a little high also.- 142 replies
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Fabric and ventilation heat loss calculator
IanR replied to Jeremy Harris's topic in Heat Insulation
I'm not sure if it's a good thing, but putting in my overall figures, it's pretty close to my "Total Heat Loss". But I'm pretty air tight, have mitigated most thermal bridges and benefit from plenty of solar gain, so I'd have expected your model to over state my thermal losses. But, costs are someway off. Either your Total Heat Loss value is dividing by COP of the HP (which I don't think it should be) or your costs are not considering the COP of the HP. It also assumes heating all year, where in reality I have around 90 heating days a year. Your ventilation value (ACH) - are you using that for the MVHR loses or for uncontrolled loses? It should be uncontrolled loses + MVHR loses in my view. I assume you've not accounted for thermal bridges ie. by setting some defaults values? Not all values are saved if you close and come back in. ie. location, manual house volume and energy source selection are not saved.- 142 replies
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Exercising Class R conversion to stable block
IanR replied to Mike Wynn's topic in Planning Permission
I believe it would, although "holiday let" may mean different things to different people. To me a holiday let (which may be let via AirBnB), would be a self-contained unit that provides facilities for day-to-day living for a single person of family, so falls within C3. C1 is intended for hotels, where rooms would be individually let to unconnected people and may not provide full facilities for day-to-day living. Ref. https://www.legislation.gov.uk/uksi/1987/764/schedule/part/C/made?view=plain -
Exercising Class R conversion to stable block
IanR replied to Mike Wynn's topic in Planning Permission
If your are renting out the unit as a "whole", where it may have a couple of bedrooms, a kitchen and a sitting area, then this would be a C3 Residential Use, rather than a C1. I believe for a C1 you'd have to rent out individual rooms, as per a hotel. But... there is a grey area between these two. The last Tory government had completed a consultation for a new C5 Use Class, specifically for AirBnB "2nd homes", I've not heard if Labour intend to bring this to fruition, but it's not on the statute books yet.