The Shingles for a Shed Roof calculator computes the total number of bundles of shingles needed to cover a single sloped roof based on the span, ridge length and the front and back overhangs.
INSTRUCTIONS: Choose units and enter the following:
- (L) Ridge Length (include rakes)
- (S) Span
- (P) Pitch (choose: 2/12,3/12,4/12,5/12,6/12,7/12,8/12,9/12,10/12,12/12,14/12)
- (oH) Overhang (default: 12")
- (MoE) Margin of Error (added to the calculated Truss Length)
- (SBC) Shingle Bundle Coverage (33.3 ft2 for 3-Tab and 32.8 ft2 for architectural)
Shingles for Shed Roof (TL): The calculator returns the number of shingle bundles for the roof, and the number of roofing nails for both normal and high wind conditions (see below). The calculator also returns the square feet of the roof.
The Math / Science
A Shed Roof is a roof with a single slope (see picture). Shed Roofs are used in simple agriculture buildings and state of the art modern buildings. The Shingles for a Shed Roof calculator is meant to help with material estimates for a roof. The rafter length uses the pitch (rise over run) and the span, which is the width plus the two overhangs (front and back). This algorithm also accounts for a double row of shingle on the bottom drip edge.
The number of roofing nails is based on the two factors, one for normal wind conditions and one for high wind conditions. For normal wind, the algorithm uses 348 nails per 100 ft2 based on the nailing patter shown below. For high wind conditions, the algorithm uses 522 nails per 100 ft2 based on the nailing pattern below.
In all cases, confirm your estimates with a professional estimate and adhering to local building codes.
A Shed Roof is a roof with a single slope. Shed Roofs are used in simple agriculture buildings and state of the art modern buildings. A Shed Roof can be made with trusses or rafters and can be covered will various waterproof materials including shingles, metal panels and tile. 
Shed Roof Calculator Functions
- Metal Panels for Shed Roof: This computes the total number of metal panels and lengths of trim needed to cover a single sloped roof based on the span, pitch, ridge length and the front and back overhangs.
- Shingles Needed for Shed Roof: This computes the total number of 33.3 ft2 bundles of shingles needed to cover a single sloped roof (shed roof) based on the span, ridge length and the front and back overhangs.
- Cost of Shingles for Shed Roof:
This computes the cost estimate for shingles to cover a shed roof based on the roof dimensions and a unit price of a bundle of shingles. - Underlayment for Shed Roof: This computes the surface area of a shed roof and the cost estimate for underlayment based on the roof dimensions and a unit price of underlayment.
- 4x8 Sheathing for Shed Roof: This computes the total number of 4x8s needed to cover a single sloped roof based on the span, pitch, ridge length and the front and back overhangs.
- Purlins for Shed Roof: This computes the total number and length of purlins for a single sloped roof based on the span, pitch, ridge length and the front and back overhangs.
- Trusses for Shed Roof: This computes the total number and length of trusses for a single sloped roof based on the span, pitch, ridge length and the front and back overhangs.
- Metal for Shed (Roof and Walls): This computes the total number and length of metal panels for the roof and walls based on the ridge length of the roof, the front and back heights, the width (span) of the building and the front and back overhangs.
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