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Choose units: Imperial units (Btu/hr)
Choose units: S.I. units: Watts
""
""
High-point thickness
Low-point thickness
R-value per unit
Additional R-value
Total roof area
""
check (value of 0 means no problem)
Total R-value at low point must be > 0
Total R-value at intermed point must be > low point
n/a
n/a
n/a
n/a
Total R-value at high point must be > int and low pt
R-value must be positive
Ratio of trap. Sides must be > 1
n/a
n/a
n/a
n/a
Roof area must be > 0
Number of roof components must be >= 0
Conversions (Imperial to SI):
inches to mm
sq ft to sq meters
R-value to RSI-value
R-value/inch to RSI-value/mm
Btu/hr to watts
temp differential in deg F to deg C
Conversions (SI to Imperial):
mm to inches
sq meters to sq ft
RSI-value to R-value
RSI-value/mm to R-value/inch
0.0416866
Watts to Btu/hr
temp differential in deg C to deg F
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