HomeMy WebLinkAboutFile Documents.520 S Original St.0110.2018 (3).ARBKS THERMAL RESISTANCE OF ASSEMBLY PROPOSED ASSEMBLY @ 70O INTERIOR TEMPERATUREMDT DP @ DP @ DP @ DP @ DP @ TILAYER R-value20% RH 25% RH 30% RH 35% RH 45% RHOutside air layer 0.17Metal Roofing 0Month FOFOFOFOFOFOFOWater-proof membrane0.21 January19.8 30 33 37 41 483/4 Sheathing 0.94 February23.1 30 33 37 41 48Spray foam 49March29 30 33 37 41 48April38.9 30 33 37 41 48May48 30 33 37 41 48June56.1 30 33 37 41 48Condensing surface is above this line July62.2 30 33 37 41 48Air spaceAugust60.4 30 33 37 41 48R-19 UF battSeptember53.6 30 33 37 41 485/8" GPDW0.56 October44.1 30 33 37 41 48November30.7 30 33 37 41 48Mean Daily Temperature (January) 22.5December22.1 30 33 37 41 48Total R value of assembly50.88MDTMean Daily TemperatureSum of insulation R values must be 49 or greaterDPDew Point(or match Rescheck/Comcheck)RHRelative HumidityTITemperature of Sheathing/Insulation Interface = 70 - [(R-value)/(R-total)*(∆T)]Temperature of condensing surface∆T70 - MDT(must be greater than 41 degrees)Use this to determine if an unvented roof assembly will have condensation problems. Enter the R value of each component of your assembly. You may use rigid insulation above the roof sheathing, impermeable insulation below the roof sheathing, or a combination. Enter the R values in the white boxes. Print the first page only.SHEA RESIDENCE ‐ 520 S. ORIGINAL ST. UNIT A4969.504/20/2018