Gable Roof Underlayment and Cost

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The Gable Roof Underlayment and Cost calculator estimates the cost of underlayment to cover a basic gable roof based on the area of a roof computed from the dimensions (length, span, pitch and overhang) and the unit price underlayment material.

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 per Square Foot of Underlayment Material

Cost of Roof Underlayment (TC): The calculator returns the total square feet in underlayment and the estimated cost in U.S. dollars. However, these can be automatically converted compatible units via the pull-down menu.

Note, the default Unit Price per Square Foot is equal to the cost of Polypropylene below. Enter any other value you wish to override the default.

The Math / Science

The surface area of a gable 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.

The Math / Science

Underlayment Pricing Data

IMPORANT NOTE

Underlayment Calculators

Roof Calculators

See Also