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Found 11 results

  1. Hi All Does anyone have any alternatives to kingspan that can provide psi values for a 100mm brick-100mm cavity (with 50mm insulation board) and 100 mm dense concrete block? I was first looking at QUINN/MANNOK as its about half the price, have all the relevant details except for psi values when using a 50mm insulation board. Essentially what I'm looking for is similar to the attached with a cheaper product so wondered if anyone had had any luck with this Thanks Jordan 1581676158_50mmCavityKoolthermK108(50mmin100mmcavity)StandardDetails-2ndIssueFebruary2019.pdf
  2. We're getting an extension built over the garage to extend the living space and we're trying to optimise for natural lighting. The design introduces more than the 25% of the extended floor space in new glass so we're told by the building regs people that we need to get SAP calculations done. Can anyone advise as to what the scope of those SAP calcs should cover and do I also need a new EPC certificate or does that come with it? I don't quite understanding if the evaluation needs to be done for the entire house or limited to just the space in which we're making changes to. I want to make sure I'm asking for quotes for what I actually need.
  3. Most of us calculate Design EPC numbers using the free FSAP software from Stroma. This is a thread for help and questions, since I may be about to ask a few. Ferdinand
  4. Hi I think I understand how U-Values are calculated e.g. (Layer thickness) X Lambda = R in m2 K/W Add up all the R-values for each of the layers and 1/(Total R-Value) = U-Value in W/m2 K However if you look at the calculations from my "As-designed" SAP 2009 report below, the calculated Total R-Value = 5.844 m2 K/W and if you take the inverse of that the U-Value is 1/5.844 = 0.171 W/m2 K and not the 0.14 shown on the report below. Can anyone please explain how the 0.14 was achieved...what am I missing??? Thanks
  5. Does anyone have a link to an idiot proof guide to help me understand my U-Value calculations, and what ‘Ok’ might look like please. I don’t have a passive house, so it won’t be super efficient, and some of the assumptions in mine aren’t quite right I believe as surely if I have MHRV it shouldn’t say ‘ventilation natural, fans 5’ ? It also doesn’t take the extension into account either. I really just would like to form view of how my house performs, and how I might be able to calculate a revised value. I doubt I can change anything at this stage. Many thanks! Summary of mine is below.
  6. I know that most people here are building homes that will far exceed the minimum standards required by Part L of the Building Regulations (Part L = conservation of fuel & power) I finished my own build about a year ago - it's a small 2 bed holiday home on a remote site in N Wales and I decided to build it to just meet the minimum standards allowable in Part L and I thought it may be useful to give those of you who are exceeding Part L requirements an example of minimum compliance for comparison purposes. It's a single storey timber frame and timber clad bungalow with a net internal area of 71 m2 and an internal heated volume of 234 m3 (we've exposed the pitch of the roof internally). It's a rectangular shape on plan as it's built along the contour of a 1:8 sloping site. (Small rectangular bungalows are about the worst shape for energy efficiency). It's heated by bulk LPG and a combi boiler. No PV or other renewables. Naturally ventilated with no MVHR. These are my SAP figures: EPC C71 [Edit to add EI Rating of B81] Averaged (area weighted) 'U' values for walls, floor and roof of 0.15 Actual 'U' values are: floor 0.1 (we have a ground bearing conc slab with Hive app controlled underfloor heating and 300mm of EPS under the concrete) walls: 0.21 (minimum allowed in Welsh regs). Roof: 0.13 Windows 3G 0.8 Air test actual figure of 3.7 m3/(h.m2) (no special tapes or air tightness layer) Energy demand figures from the SAP calculation: Heating demand 3400 kWh (this equals 47.9 kWh/sqM of internal area) Hot water: 2290 kWh Electric for pumps and fans: 120 kWh Electric for lighting: 314 kWh (all LED) Primary Energy Demand: 106.1 kWh/sqM/year [Edit to add: CO2 emissions: 1,596 kg/yr CO2 emissions: 22.49 kg/m2] The house is warm and draught free. The things I like most about it apart from the location and spectacular views are the open plan layout with tall 'cathedral' ceilings, the u/floor heating and the 3G windows. I'd be very interested in seeing comparative figures for your own builds. Ian
  7. Am I correct in thinking that there are two SAP assesments, one prior to starting and one when actually built? Since our initial assessment, we have progressed with the build, now at second fix. Unsurprisingly we have made some changes to the original specification. We have increased the amount of glazing to a Southerly aspect, now have underfloor heating installed rather than radiators. Now looking at not installing a gas combi boiler, instead a couple of Ellis water heaters for the ufh heating and a hot water tank with an electric immersion. It is for a holiday home at present, so not going to get intensive use. Can always install the gas fired solution in the future if required. Also, owing to some project scope creep, funds are dwindling, so the log burner may not be installed as originally planned, once again maybe in the future. On the plus side I’m hoping we will be a lot more airtight that the 5 used in the original SAP. Just wondering how this is going to impact on my final SAP, do I just wait and see? Can I end up ‘failing’ ? If so what then?
  8. Our provisional BC SAP came through at 101 A (6Kw of PV or 107 with the full 8Kw) which makes me very happy. However the assessor told me I could have got two more points if I didn't have the MVHR because of the energy it uses. Can't live without MVHR so was wondering what the collective experience was with SAP and MVHR, can I get a better MVHR (Unit so far in the frame is: Airflow Adroit DV145) what, I wonder, is the conversion from energy use to points (Banded / Algebraic / ?) because I am not sure I will get a much lower figure.
  9. Has anyone ever done a manual SAP calculation? I have just finished it (lots or excel work that I can maintain and update) and want to make sure I have some sensible answers. Here are some key points: Total Floor Area: 414.29m2 Living Floor Area: 107.39m2 Dwelling Volume: 1077.88m3 Window Area: 50.5m2 U-values 0.8 – 1.04 (PHPP calculations) Door Area: 10.62m2 U-value 0.73 External Wall Area: 345.4m2 U-value 0.10-0.11 Roof Area: 355.8m2 U-value 0.11 Thermal Bridges: 7.85W Design 26.66W TFEE Design FEE TFEE Effective Air Change Rate: 0.15 10.23 10.52 Heat Loss Parameter: 0.508 W/m2K 9.162 W/m2K 9.563 W/m2K Water Heating required: 2837 kWh/year 2404 kWh/year 2837 kWh/year Internals and solar Gains: 1540-2711 W/month 1396-2423 W/month 1612-3322 W/month mean Internal temp: 20.22-20.49oC 13.59-14.97oC 17.76-19.02oC Space Heating required: 1.17 kWh/m2/year 11.64 kWh/m2/year 11.94 kWh/m2/year Space cooling required: 0.64 kWh/m2/year 0.06 kWh/m2/year 0.04 kWh/m2/year Giving a Fabric Energy Efficiency of: 1.81 kWh/m2/year Design 11.70 kWh/m2/year FEE 13.77 kWh/m2/year TFEE So my designed Fabric Energy Efficiency is far better than the notional Dwelling Fabric Energy Efficiency Rate let alone the Target Fabric Efficiency rate, so I am ok there. On CO2 emissions the Target Emission Rate is 7.37 and the Design is -1.11 or -1.89 depending on how I calculate the DHW, so again well under. So my calculated ratings are SAP A (100-102), CO2 A (101-103) and Primary Energy A (109-115). The variation is based on DHW higher figure for pure Gas DHW, the lower if is assume half provided by ASHP pre-heat (but I will have to get authorisation for that). Is this the sort of answers I should be getting?
  10. I'm ploughing through the final bits for submission of BRegs and I've come across an interesting query.... The build being undertaken is listed as a Conversion and Extension on the planning application, and is effectively the conversion of a large 28sqm footprint double garage, and adding on two extensions of around 30sqm and 45sqm respectively. As its listed as a conversion, and to all intents and purposes the walls will remain from the old garage (it was built for the purpose of conversion in 1992) then its questionable as to whether it needs to follow L1B or L1A. If I read the terms in L1A then the creation of the house from the garage constitutes a material change of use as per the definition. If that is the case, I assuming all of the DER, TER, SAP and Pressure testing goes out of the window and basically I'm on best endeavours in relation to meeting the regs on an elemental method..?? Does that sound reasonable or have I missed something..??!!
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