Hip Roof Underlayment and Cost

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The Hip Roof Underlayment and Cost calculator computes the surface area of a hip roof based on the dimensions. The surface area includes the four sides (faces). It then uses the surface area to compute the cost of underlayment based on the unit price (price per square feet) of underlayment material.

INSTRUCTIONS: Choose units and enter the following:

(S) Span of Roof
(L) Length of Roof
(P) Pitch (choose pitch from list)
(oH) Overhang
(UP) Unit Price of Underlayment

Hip Roof Underlayment and Cost (TC): The calculator returns the total hip roof area underlayment in square feet (ft²) and the cost in U.S. dollars.

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

A hip roof is basically a rectangular trapezoid volume has regular trapezoids in the front and back and triangles on the sides. The bottom and top rectangles are centered, form parallel planes and separated by the height. The surface area of a hip 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 hip 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.

NOTE: vCalc gives no guarantee that you will be able to buy the product at these prices or even if they will be available. This is purely a convenience for making estimates, so we repeat, ALWAYS use local pricing.

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.