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Thickness at high and low pts
Intermediate thickness, M, for crickets only
Ignore intermediate thickness?
Ratio of sides (B/C) for trapezoidal base
high point, H
low point, L
Yes
No
R-value per unit thickness of tapered insulation:
Taper slope
Total R-value of additional (uniform, un-tapered) material:
Ignore
1:12
2:12
3:12
4:12
5:12
6:12
7:12
8:12
9:12
10:12
11:12
12:12
Efficiency (%) compared with:
true average thickness
1-way slope:
1-way slope with trapezoidal base (parallel high and low edges):
4-way slope, int. drain (or 1-way slope converging down to a point):
4-way slope, ext. drain (or 1-way slope converging up to a point):
triangular cricket:
check
R-value of tapered insulation must be greater than 0
Additional R-value must be greater or equal to 0
R-value cannot be zero at any point
high point must be greater than low point
if used, low point < intermediate point < high point
ratio of trapezoid sides must be greater than 1