The Metal for a Roof calculator estimates the materials needed for a metal roof for a simple gabled roof based on the roof dimensions.
INSTRUCTIONS: Choose units and enter the following:
Metal for a Roof (RM): The calculator returns the number and length of panels. If "DETAILS" are chosen, the calculator returns the following:
The Metal for a Roof calculator is meant to help with material estimates for a metal roof. In all cases, confirm your estimates with a professional estimate and adhering to local building codes.
The calculator uses the ridge length, pitch and roof span to compute the roof area. The most common width of both G-Rib and R-Rib metal panels is 36". This is the default in this calculator. Note: under the ridge cap, you will need foam closure which keeps rain from being driven up under the ridge cap. The length of the foam closure that you'll need is four times the ridge length, two for either side of the ridge, and two for the bottoms above the angle trim.
A spacing of twenty four inches (24") between rows of purlins is used to compute the number and length of purlins. To compute the length and number of purlins using a different spacing, use the Purlins for a Roof Calculator (CLICK HERE).
Roofing Geometry Calculators