Technique 2
Alternative check procedure
step
16. A x C sq. ft. = total room sq. ft
17. step16 / (30 sq. ft.) = number of single rolls adjusted for slippage
18. step17 - (F/2) = final #rolls (round up)
step7 in Technique #1 should be approx. equal to step18 in Technique #2
Border estimating
(A / (J + (G x I) - N )) = number of border rolls