Underlayment for Shed Roof

The Shed Roof Underlayment and Cost calculator 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. 

INSTRUCTIONS: Choose units and enter the following;

• (L) Ridge Length of Roof
• (S) Span of Roof
• (P) Pitch of Roof
• (oH) Overhang of Roof
• (uP) Unit Price of Underlayment

Cost of Underlayment for a Shed Roof (TC): The calculator returns the shed roof surface area in square feet and the cost of underlayment in U.S. dollars.  However, these can be automatically converted into compatible units via the pull-down menu. 

Note: the default unit price is set to the current cost of polypropylene below.  However, you can enter any value you wish to override this.

The Math / Science

The surface area of a shed roof is easy to compute based on the span, ridge length, overhang and pitch of the roof.  This calculator uses those specifications to compute the surface area of the roof.  Once the surface area is known, the unit pricing (cost per square foot of underlayment) can be easily applied.

Underlayment comes in different types of materials and in different sizes of products measured in square feet. To compute the Unit Price per Square Feet  CLICK HERE.  A pop-up calculator will let you enter the product size (e.g., 265 square feet) and the total cost and will return the dollars per square feet.

Underlayment Pricing Data

The underlayment pricing data contains the following information in each record.

• Underlayment Pricing Survey Date: 1/2/23
• Underlayment Pricing Survey Store: Lowes 
  • Price of Felt Underlayment: $0.12 USD/ft²
  • Price of Polypropylene Underlayment: $0.36 USD/ft²
  • Paper (red rosin) Underlayment: $0.03 USD/ft²
  • Rubber Underlayment: $0.95 USD/ft²
  • Rubberized Asphalt Underlayment: $0.61 USD/ft²
  • Synthetic Underlayment: $0.08 USD/ft²

All pricing is in U.S. dollars per square feet of underlayment.

IMPORANT NOTE

All pricing in vCalc is for use by our community to provide rough estimates on project costs.  One should always use local pricing for the most accurate pricing available.  Price surveys are based on listed prices on the websites of the companies listed and only periodically updated at this time.  The product retailer surveyed is randomly selected. No assertions or recommendations are made on retailer reliability, service quality or product value, availability or any other implied guarantees.  This is simply a price survey to help with rough estimates and the math of construction.

Underlayment Calculators

• Underlayment for a Gable Roof
• Underlayment for a Hip Roof
• Underlayment for a Gambrel Roof
• Underlayment for a Shed Roof

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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