EIFS Calculator

Wall R-value (EPS Only) is driven entirely by EPS Thickness -- R-4 per inch, with no other input touching it at all; Wall Area, Mesh Overlap, Base Coat Layers, and Waste Allowance all have zero effect on the R-value this calculator reports. Base Coat Layers is similarly narrow in its reach: it multiplies only Base Coat (gal/pails), since base coat gallonage is calculated per layer applied. It does NOT affect Finish Coat Pails, Adhesive Tubes, EPS Boards, Mesh Rolls, or EPS Volume -- those are each governed by a separate, single-layer material-takeoff formula that Base Coat Layers never touches.

Waste Allowance (%) has a split personality here: EPS Boards and Mesh Rolls are the only two outputs whose formulas add the percentage before rounding up, so pushing Waste Allowance higher genuinely grows those two totals. Base Coat Pails, Finish Coat Pails, Adhesive Tubes, and EPS Volume never see that percentage anywhere in their math -- their formulas run off Wall Area (plus Base Coat Layers for Base Coat Pails, and EPS Thickness for EPS Volume) with no waste term at all, so no amount of Waste Allowance moves them, however counterintuitive that feels for a setting most people expect to touch every material line. Mesh Overlap only feeds Mesh Rolls, through a modest overlap-adjustment factor on total mesh area; it has no bearing on EPS boards, either coat, or adhesive quantities.