I am using planswift with the metric system and am unfamiliar with the imperial system. Im putting in my pitch at 40 degrees but the roof is comin in at a massive area compared to when i measure it manually with a ruler.
I tried putting in 10/12 instead (which should be close to 40degrees?) but now the area of the roof is too small.
roof pitch in say the joist tool is a single number, not 10/12 nor 40* just use 10
Simple Formula: Sqrt(rise(M)^2+run(M)^2)/run(M) the product of this formula will produce what I call a Pitch factor which can be multiplied to Area's or Linear's totals.
Sqrt(.152^2+.305M^2 =.340778: .34778/.305=1.117
Sqrt(6^2+12^2 =13.416: 13.416/12=1.118
so if a rafters run were 10' the rafter would be 11.18' in length
or if a rafters run were 3M the rafter would be 3.351M