Does REScheck take air infiltration into consideration?
No, REScheck implements Chapter 5 of the MEC and IECC which does not have any infiltration requirements — the code’s component performance approach (Chapter 5) specifies maximum Uo-factor requirements for walls, ceilings, floors, crawl space walls, and basement walls and minimum R-value requirements for slab perimeter insulation. Sections 502.1.1 of the MEC and 502.2.2 of the IECC state that the Uo(a)-factor or U-value of a given assembly may be increased or the R-factor of a given assembly may be decreased if the total heat gain or loss of the entire building does not exceed the total resulting from conformance to these requirements. REScheck requirements are based solely on U-factor x Area (UA, the heat loss/gain rate) calculations for each building assembly to determine the whole-building UA of the user’s building design. The whole-building UA from a building conforming to the code requirements (the code building) is compared against the UA from the user’s building design (the prop
