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{"sheet":"Introduction","index":0,"n_rows":29,"n_cols":9,"rows_kept":29,"cut":false,"hidden":false,"merged":[[27,14,27,17],[27,2,27,5],[4,0,7,0],[4,15,7,15],[4,17,7,17],[8,15,8,17],[28,2,28,4],[8,7,27,7],[1,1,1,5],[16,1,19,1],[20,1,21,1],[22,1,27,1],[4,1,4,4],[5,1,7,4],[12,1,15,1]]}
[]
[null,"Eight Associates U-Calc - BS EN ISO 6946 U-value Calculator"]
[]
[null,"Welcome to the Eight Associates U-Calc Calculator Tool. ",null,null,null,null,null,null,"External wall"]
[null,"This free tool is designed to enable developers and architects to undertake a simple combined method U-value calculation for walls, roofs and floor slabs. ",null,null,null,null,null,null,"Roof"]
[null,"Please note, this tool is indicative and should be used in conjunction with specialist advice from your Energy Consultant. At Eight Associates, in addition to ensuring each component is compliant with the relevant building regulations, we assess robustness, buildability and any potential condensation risk (surface and interstitial). ",null,null,null,null,null,"www.eightassociates.co.uk","Ground floor"]
[null,null,null,null,null,null,null,"info@eightassociates.co.uk"]
[]
[null,"Please follow the steps below to undertake a U-value calculation. You will need the following:",null,null,null,null,null,"Eight Associates is a sustainability consultancy with a focus on delivering sustainable buildings, both in the UK and abroad. \n\nWe share our knowledge and expertise on sustainable design, by providing practical and commercially realistic solutions. We have unparalleled experience in Eco-rating systems such as BREEAM, LEED and Code for Sustainable Homes, while our interactive approach to sustainable design, energy modelling and renewable energy technologies results in truly low impact buildings.  Our passion, enthusiasm and team approach ensure that we make a difference to every project we undertake.\n\nEight Associates focuses on dialogue, technical expertise and working with the team to ensure that cost-effective, sustainable solutions are achieved for each of our projects. We are passionate about the process as much as the final outcome and work best when involved from an early design stage. This not only helps the design team to meet the development brief, but can also help surpass it.\n"]
[null,"✓","A construction drawing of the element you wish to calculate"]
[null,"✓","Details of relevant materials (i.e. insulation's manufacturer, product name and thickness)"]
[]
[null,"Step 1","Boundary Conditions"]
[null,null,null,"a.","Choose the most appropriate boundary conditions for your construction (e.g. for wall Rsi=0.13 and Rse=0.04) and enter them in cell F9 and F17, as appropriate."]
[null,null,null,null,"External wall"]
[null,null,null,null,"Note: If the internal or external surfaces have a low emissivity coatings then contact your energy consultant."]
[null,"Step 2","Select layer materials (or thermal bridge) and thicknesses"]
[null,null,null,"b.","Select cell C10 (layer 1) and choose a material from the dropdown menu (relevant material information will appear in columns D-H. Enter layer thickness (in mm) in cell D10. Repeat process for all layers (maximum of 7 layers)"]
[null,null,null,"c.","To enter a thermal bridge, select 'Thermal bridge' for the appropriate layer (any of layers 1-7) of the construction and enter a layer thickness in the appropriate cell of column D. Cells C20 & C21 become available (turn yellow) and materials within the thermal bridged layer may be selected. In cell C20 you should select the most insulating material of the bridge. In cell C21 you should select the bridging material."]
[null,null,null,null,"Note: If you cannot find an appropriate material, you can add your own into the 'Materials Database' worksheet on the tab below. You should use an appropriate source such as CIBSE Guide A."]
[null,"Step 3","Corrections to the U-value"]
[null,null,null,"d.","Corrections for air gaps and fixings may be entered by selecting the affected layer (cells O16 & O22) and then entering associated corrections (air gap - cell O17) and fixing material (cell O23), fixing cross sectional diameter in mm (cell O26) fixing length in insulation layer, d1 in mm (cell O27), and number of fixings per square meter (cell O25)."]
[null,"Step 4","Corrections for steel frame"]
[null,null,null,"e.","To correctly enter a steel frame, the steel frame layer should be entered as a thermal bridged layer (explained in item 2). Enter flange width (cell C28) and stud spacing, s (cell C29) - see below."]
[]
[]
[]
[]
[null,null,"The algorithms used in this tool are in line with BS EN ISO 6946 : 2007 (combined method U-value calculation), BRE Digest 465 (U-value correction for light steel frame constructions) and SAP 2012 (Thermal mass calculation)."]

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[]
[null,"Eight Associates U-Calc\n\nCalculation of U-value from standard EN ISO 6946\nincluding 1 thermal bridge, air gap and fixing corrections",null,null,null,null,null,null,null,null,null,null,null,null,"www.eightassociates.co.uk",null,null,"Notes"]
[null,null,null,null,null,null,null,null,null,null,null,null,null,null,"info@eightassociates.co.uk"]
[null,"Reference:",null,null,null,null,null,"Calculated U-Value",null,null,null,null,"ΔU\"","Description of air gap:"]
[null,"Job:",null,null,null,null,null,{"$f":"IF(AND(D33=\"N/A\",H33<>\"N/A\"),H33,IF(AND(H33=\"N/A\",D33<>\"N/A\"),D33,\"N/A\"))","v":5.88},null,null,null,null,0,"Insulation installed in such a way that no air circulation is possible on the warm side of the insulation. No air gaps penetrating the entire insulation."]
[null,"Client:"]
[null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,{"$f":"SUM(D10:D16)","v":0},{"$f":"V7/2","v":0},100]
[null,"Layer","Material","Layer thickness, d (mm)","Thermal conductivity, λ (Wm-1K-1)","Thermal resistance, R (m2KW-1)","Specific heat capacity \n(Jkg-1K-1)","Density \n(kgm-3)","Heat capacity (kJm-2K-1)",null,null,null,0.01,"Insulation installed in such a way that no air circulation is possible on the warm side of the insulation. Air gaps may penetrate the insulation layer."]
[null,null,"External surface","-","-",0.04,"-","-","-",null,null,null,0.04,"Air circulation possible on warm side of the insulation. Air gaps may penetrate the insulation."]
[null,1,null,null,{"$f":"IF(C10=\"Thermal bridge\",\"-\",IF(C10=\"\",\"\",VLOOKUP($C10,'Materials database'!$B$4:$E$1001,2,FALSE)))","v":""},{"$f":"IF(C10=\"Thermal bridge\",0,IF(D10=\"\",0,IF(E10=\"\",0,D10/E10/1000)))","v":0},{"$f":"IF(C10=\"Thermal bridge\",\"-\",IF(C10=\"\",\"\",VLOOKUP($C10,'Materials database'!$B$4:$E$1001,3,FALSE)))","v":""},{"$f":"IF(C10=\"Thermal bridge\",\"-\",IF(C10=\"\",\"\",VLOOKUP($C10,'Materials database'!$B$4:$E$1001,4,FALSE)))","v":""},{"$f":"IF(C10=\"Thermal bridge\",$I$20*$J$20/100+$I$21*$J$21/100,IF(C10=\"\",\"\",IF(D10=\"\",\"\",(D10/1000)*G10*H10/1000)))","v":""},null,null,null,null,null,null,null,null,null,null,null,{"$f":"IF(U11=1,1,IF(E10<=0.08,1,0))","v":0},{"$f":"IF(D10=\"\",V11,V11-D10)","v":0},{"$f":"V10+D10","v":0},{"$f":"IF(W10<=0,0,W10)","v":0},{"$f":"IF(I10=\"\",0,IF(E10<=0.08,0,(X10-X9)/D10*I10))","v":0}]
[null,2,null,null,{"$f":"IF(C11=\"Thermal bridge\",\"-\",IF(C11=\"\",\"\",VLOOKUP($C11,'Materials database'!$B$4:$E$1001,2,FALSE)))","v":""},{"$f":"IF(C11=\"Thermal bridge\",0,IF(D11=\"\",0,IF(E11=\"\",0,D11/E11/1000)))","v":0},{"$f":"IF(C11=\"Thermal bridge\",\"-\",IF(C11=\"\",\"\",VLOOKUP($C11,'Materials database'!$B$4:$E$1001,3,FALSE)))","v":""},{"$f":"IF(C11=\"Thermal bridge\",\"-\",IF(C11=\"\",\"\",VLOOKUP($C11,'Materials database'!$B$4:$E$1001,4,FALSE)))","v":""},"",null,null,null,null,null,null,null,null,null,null,null,0,0,0,{"$f":"IF(W11<=0,0,W11)","v":0},0]
[null,3,null,null,{"$f":"IF(C12=\"Thermal bridge\",\"-\",IF(C12=\"\",\"\",VLOOKUP($C12,'Materials database'!$B$4:$E$1001,2,FALSE)))","v":""},0,{"$f":"IF(C12=\"Thermal bridge\",\"-\",IF(C12=\"\",\"\",VLOOKUP($C12,'Materials database'!$B$4:$E$1001,3,FALSE)))","v":""},{"$f":"IF(C12=\"Thermal bridge\",\"-\",IF(C12=\"\",\"\",VLOOKUP($C12,'Materials database'!$B$4:$E$1001,4,FALSE)))","v":""},{"$f":"IF(C12=\"Thermal bridge\",$I$20*$J$20/100+$I$21*$J$21/100,IF(C12=\"\",\"\",IF(D12=\"\",\"\",(D12/1000)*G12*H12/1000)))","v":""},null,null,null,null,null,null,null,null,null,null,null,0,0,0,0,0]
[null,4,null,null,{"$f":"IF(C13=\"Thermal bridge\",\"-\",IF(C13=\"\",\"\",VLOOKUP($C13,'Materials database'!$B$4:$E$1001,2,FALSE)))","v":""},0,{"$f":"IF(C13=\"Thermal bridge\",\"-\",IF(C13=\"\",\"\",VLOOKUP($C13,'Materials database'!$B$4:$E$1001,3,FALSE)))","v":""},{"$f":"IF(C13=\"Thermal bridge\",\"-\",IF(C13=\"\",\"\",VLOOKUP($C13,'Materials database'!$B$4:$E$1001,4,FALSE)))","v":""},{"$f":"IF(C13=\"Thermal bridge\",$I$20*$J$20/100+$I$21*$J$21/100,IF(C13=\"\",\"\",IF(D13=\"\",\"\",(D13/1000)*G13*H13/1000)))","v":""},null,null,null,null,null,null,null,null,null,null,null,0,0,0,0,0]
[null,5,null,null,{"$f":"IF(C14=\"Thermal bridge\",\"-\",IF(C14=\"\",\"\",VLOOKUP($C14,'Materials database'!$B$4:$E$1001,2,FALSE)))","v":""},0,{"$f":"IF(C14=\"Thermal bridge\",\"-\",IF(C14=\"\",\"\",VLOOKUP($C14,'Materials database'!$B$4:$E$1001,3,FALSE)))","v":""},{"$f":"IF(C14=\"Thermal bridge\",\"-\",IF(C14=\"\",\"\",VLOOKUP($C14,'Materials database'!$B$4:$E$1001,4,FALSE)))","v":""},"",null,null,null,"Correction for air gap within layer (ΔUg)",null,null,null,null,null,null,null,0,0,0,0,0]
[null,6,null,null,{"$f":"IF(C15=\"Thermal bridge\",\"-\",IF(C15=\"\",\"\",VLOOKUP($C15,'Materials database'!$B$4:$E$1001,2,FALSE)))","v":""},0,{"$f":"IF(C15=\"Thermal bridge\",\"-\",IF(C15=\"\",\"\",VLOOKUP($C15,'Materials database'!$B$4:$E$1001,3,FALSE)))","v":""},{"$f":"IF(C15=\"Thermal bridge\",\"-\",IF(C15=\"\",\"\",VLOOKUP($C15,'Materials database'!$B$4:$E$1001,4,FALSE)))","v":""},"",null,null,null,"Layer containing gaps:",null,null,"-",null,null,null,null,0,0,0,0,0]
[null,7,null,null,{"$f":"IF(C16=\"Thermal bridge\",\"-\",IF(C16=\"\",\"\",VLOOKUP($C16,'Materials database'!$B$4:$E$1001,2,FALSE)))","v":""},0,{"$f":"IF(C16=\"Thermal bridge\",\"-\",IF(C16=\"\",\"\",VLOOKUP($C16,'Materials database'!$B$4:$E$1001,3,FALSE)))","v":""},{"$f":"IF(C16=\"Thermal bridge\",\"-\",IF(C16=\"\",\"\",VLOOKUP($C16,'Materials database'!$B$4:$E$1001,4,FALSE)))","v":""},"",null,null,null,"ΔU\" from above table =",null,null,"-",null,null,null,null,{"$f":"IF(U17=0,0,IF(E16<=0.08,0,1))","v":0},0,0,0,0]
[null,null,"Internal surface","-","-",{"$f":"IF(Introduction!$E$15=Introduction!$I$4,0.13,IF(Introduction!$E$15=Introduction!$I$5,0.1,0.17))","v":0.13},"-","-","-",null,null,null,"ΔUg =",null,{"$f":"IF(OR(O15=\"\",O16=\"\"),0,IF(O15=\"Thermal bridge\",O16*(F20/F22)^2,O16*(VLOOKUP(O15,C10:F16,4,FALSE)/F22)^2))","v":0},"Wm-2K-1",null,null,null,null,null,{"$f":"IF(W7>=X7,X7,W7)","v":0}]
[]
[null,null,"Thermal bridge:",null,null,null,null,null,null,"% area","RΣ (m2KW-1)",null,"Correction for mechanical fixings within layer (ΔUf)"]
[null,"Insulation",null,null,{"$f":"IF(C20=\"\",\"\",VLOOKUP($C20,'Materials database'!$B$4:$E$1001,2,FALSE))","v":""},{"$f":"IF(D20=\"\",0,D20/E20/1000)","v":0},{"$f":"IF(C20=\"\",\"\",VLOOKUP($C20,'Materials database'!$B$4:$E$1001,3,FALSE))","v":""},{"$f":"IF(C20=\"\",\"\",VLOOKUP($C20,'Materials database'!$B$4:$E$1001,4,FALSE))","v":""},{"$f":"IF(C20=\"\",\"\",IF(D20=\"\",\"\",(D20/1000)*G20*H20/1000))","v":""},null,{"$f":"SUM(F9:F17,F20)","v":0.17},null,"Layer  containing fixing:",null,null,"-"]
[null,"Bridge",null,null,{"$f":"IF(C21=\"\",\"\",VLOOKUP($C21,'Materials database'!$B$4:$E$1001,2,FALSE))","v":""},{"$f":"IF(D21=\"\",0,D21/E21/1000)","v":0},{"$f":"IF(C21=\"\",\"\",VLOOKUP($C21,'Materials database'!$B$4:$E$1001,3,FALSE))","v":""},{"$f":"IF(C21=\"\",\"\",VLOOKUP($C21,'Materials database'!$B$4:$E$1001,4,FALSE))","v":""},{"$f":"IF(C21=\"\",\"\",IF(D21=\"\",\"\",(D21/1000)*G21*H21/1000))","v":""},{"$f":"100-J20","v":100},{"$f":"SUM(F9:F17,F21)","v":0.17},null,"Fixing material:",null,null,"-"]
[null,null,null,null,null,{"$f":"SUM(F9:F17)+F20","v":0.17},null,null,null,null,null,null,"λf =",null,{"$f":"VLOOKUP(Calculator!O21,'Materials database'!H3:I4,2,FALSE)","v":{"$error":"#N/A"}},"Wm-1K-1"]
[null,null,null,null,null,null,null,null,null,null,null,null,"nf =",null,null,"m-2"]
[null,"Rupper (m2KW-1)",null,"Rlower (m2KW-1)",null,"Rtotal (m2KW-1)",null,null,null,null,"K (kJm-2K-1) ",null,"Cross sectional diameter =",null,null,"mm"]
[null,{"$f":"1/((J20/(100*K20))+(J21/(100*K21)))","v":0.16999999999999998},null,{"$f":"SUM(F9:F17)+IF(F20=0,0,(IF(J20=0,1/(J21/(100*F21)),1/(((J20/(100*F20)))+(J21/(100*F21))))))","v":0.17},null,{"$f":"AVERAGE(B25:D25)","v":0.16999999999999998},null,null,null,null,{"$f":"SUM(Y10:Y16)","v":0},null,"Fixing penetration depth =",null,null,"mm"]
[null,null,null,null,null,null,null,null,null,null,null,null,"Af =",null,{"$f":"IF(O24=\"\",\"\",3.14159*(O24/(2*1000))^2)","v":""},"m2"]
[null,null,null,null,null,null,null,null,null,null,null,null,"ΔUf =",null,{"$f":"IF(OR(O20=\"\",O23=\"\",O24=\"\",O25=\"\"),0,IF(O20=\"Thermal bridge\",\n0.8*(O25/D20)*O22*O23*O26/(D20/1000)*(F20/F22)^2,\n0.8*(O25/VLOOKUP(O20,C10:D16,2,FALSE))*O22*O23*O26/(VLOOKUP(O20,C10:D16,2,FALSE)/1000)*(VLOOKUP(O20,C10:F16,4,FALSE)/F22)^2))","v":0},"Wm-2K-1"]
[null,"U-value calculations",null,null,null,null,null,null,null,null,null,null,null,"material thickness",{"$f":"IF(O20=\"Thermal bridge\",D20,VLOOKUP(O20,C10:D16,2,FALSE))","v":{"$error":"#N/A"}}]
[null,"ΔU = ΔUg+ΔUf =",null,{"$f":"O17+O27","v":0},"Wm-2K-1","For steel frame constructions:",null,null,null,null,null,null,"Correction for steel frame ( ΔUf)"]
[null,"ΔU/U =",null,{"$f":"IF(AND(C21=\"Steel\",OR(O30=\"\",O31=\"\",O33=\"\")),\"N/A\",IF(C21=\"Steel\",(D29/H32)*100,(D29/D31)*100))","v":0},"%","p =",null,{"$f":"IF(O30=\"\",\"\",IF(O31=\"\",\"\",IF(O30<=50,IF(O31=\"\",0,IF(O32=\"\",0,0.8*(D25/B25)+0.32-0.2*(600/O31)-0.04*(O32/100))),IF(O31=\"\",0,IF(O32=\"\",0,0.8*(D25/B25)+0.24-0.2*(600/O31)-0.04*(O32/100))))))","v":""},null,null,null,null,"Flange width =",null,null,"mm"]
[null,"U = ",null,{"$f":"IF(C21=\"Steel\",\"N/A\",1/F25)","v":5.882352941176471},"Wm-2K-1","Rt =",null,{"$f":"IF(OR(O30=\"\",O31=\"\"),\"\",IF(O33=\"Cold/Hybrid Frame\",H30*B25+(1-H30)*D25,IF(O33=\"Warm frame\",0.5*(B25+D25),\"N/A\")))","v":""},"m2KW-1",null,null,null,"stud spacing, s =",null,null,"mm"]
[null,"Uc=U+ΔU (if ΔU/U>3%)",null,{"$f":"IF(D31=\"N/A\",\"N/A\",IF(D30<3,D31,D29+D31))","v":5.882352941176471},"Wm-2K-1","U =",null,{"$f":"IF(H31=\"\",\"\",IF(H31=\"N/A\",\"N/A\",1/H31))","v":""},"Wm-2K-1",null,null,null,"stud depth, d =",null,{"$f":"IF(C21=\"Steel\",D21,\"\")","v":""},"mm"]
[null,"Uc (2dp)=",null,{"$f":"IF(D32=\"N/A\",\"N/A\",ROUND(IF(D30<3,D31,D29+D31),2))","v":5.88},"Wm-2K-1","U+ΔU =",null,{"$f":"IF(H32=\"\",\"N/A\",IF(H32=\"N/A\",\"N/A\",H32+IF(D30<3,0,D29)))","v":"N/A"},"Wm-2K-1",null,null,null,"Type of construction:"]
[]
[null,"Disclaimer: This calculator is intended to provide users with indicative performance figures for building elements (U-values & K-values of walls, roofs and floor slabs) and hence should not be used to show compliance with national building regulations or of actual performance. The calculation tool allows entry of one thermal bridge as well as one fixing and air gap correction. For constructions that require more thermal bridges & corrections, please contact Eight Associates. \n\nInputs and outputs from this calculator should be verified by a qualified energy professional.\n"]

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[]
[null,"Material","Thermal conductivity, λ \n(Wm-1K-1)","Specific heat capacity \n(Jkg-1K-1)","Density \n(kgm-3)","Source",null,"Fixing material","Thermal conductivity, λ (Wm-1K-1)"]
[null,"Thermal bridge","-","-","-","-",null,"Steel",50]
[null,"Air 15mm",8.8200000000000001E-2,1.0049999999999999,1.2929999999999999,null,null,"Stainless Steel",17]
[null,"Air 50mm",0.27778000000000003,1.0049999999999999,1.2929999999999999,null,null,null,null,null,"www.eightassociates.co.uk"]
[null,"Block (heavy)",0.9,840,1850,"CIBSE Guide A",null,null,null,null,"info@eightassociates.co.uk"]
[null,"Block (light)",0.22,840,750,"CIBSE Guide A"]
[null,"Block (medium)",0.32,840,1050,"CIBSE Guide A"]
[null,"Brickwork (exposed)",0.77,1000,1750,"CIBSE Guide A"]
[null,"Brickwork (protected)",0.56000000000000005,1000,1750,"CIBSE Guide A"]
[null,"Concrete (dense reinforced)",1.7,840,2200,"CIBSE Guide A"]
[null,"EPS",0.04,1450,15,"CIBSE Guide A"]
[null,"Mineral wool (batts)",3.7999999999999999E-2,1030,25,"CIBSE Guide A"]
[null,"Mineral wool (quilt)",4.2000000000000003E-2,1030,12,"CIBSE Guide A"]
[null,"Mortar",0.88,920,1650,"CIBSE Guide A"]
[null,"Plaster",0.51,960,1120,"CIBSE Guide A"]
[null,"Plaster dabs",0.42,960,1120,"BR443 & CIBSE Guide A"]
[null,"Plasterboard (fire-rated)",0.25,1000,900,"CIBSE Guide A"]
[null,"Plywood",0.13,1600,500,"CIBSE Guide A"]
[null,"PUR/PIR",2.5000000000000001E-2,1400,30,"CIBSE Guide A"]
[null,"Render",1,1000,1800,"CIBSE Guide A"]
[null,"Screed",1.4,650,2100,"CIBSE Guide A"]
[null,"Stainless Steel",17,1800,1500,"CIBSE Guide A"]
[null,"Steel",50,450,7900,"CIBSE Guide A"]
[null,"Timber (Softwood)",0.13,1600,500,"CIBSE Guide A"]
[null,"XPS",3.5000000000000003E-2,1400,40,"CIBSE Guide A"]