The Pyramid Roof Underlayment and Cost calculator computes the surface area of a pyramid 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) Side-span of Roof
- (P) Pitch (choose pitch from list)
- (oH) Overhang
- (UP) Unit Price of Underlayment
Pyramid Roof Underlayment and Cost (TC): The calculator returns the total pyramid 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
Pyramid Hip Roof
A Pyramid Hip Roof is a special case of a hip roof where the hips come to a single point and do not form a ridge line. All four faces create triangular ends (faces) to the roof which are all exposed to rain and snow from above and require roofing material.
The specifications of a Pyramid Hip Roof can be defined by a span, pitch and overhang (see diagram). These calculators compute the area, hip ridge lengths and materials required for a pyramid hip roof.
Roofing Materials
The roofing materials to cover a pyramid roof include:
Pyramid Hip Roof Geometries
A pyramid hip roof is geometrically a square based pyramid. The surface area and four hip ridge lengths can be computed using simple trigonometry using the span, including overhang and the pitch.
The photograph shows two sheds located in Colonial Williamsburg, Virginia that have pyramid hip roofs.
Pyramid Hip Roof Calculators
- Shingles for a Pyramid Roof: Number of shingles (normal and ridge), roofing nails and cost estimate.
- 4x8 Sheathing for a Pyramid Roof: Number of 4x8 sheathing needed to cover roof.
- Underlayment for a Pyramid Roof: Square feet of underlayment and estimated cost.
- Metal Panels for a Pyramid Roof: Metal panels, hip ridge trims, and angle.
- Purlins for a Pyramid Roof: Number of rows of purlins and the length of each row.
- Pyramid Roof Geometries: Surface area, volume, lengths of hips, face length, base area of a pyramid.
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
Hip Roof Calculators
Roof Calculators
- Gabled Roof
- Hip Roof
- Shed Roof
- Dormers
Building Calculators
- Total Building Materials Calculator
- Pitch of a Roof - Computes angle of incline in the roof in both degrees and rise over 12" run (e.g. 26.6o : 6/12) based on the length of the rise and run.
- Number of Trusses Needed for a Roof - number of trusses needed based on the roof width and the truss spacing.
- 4x8s needed for a roof - Calculates the number of 4x8 sheets needed to cover a roof.
- Roofing nails needed for a roof - Calculates the number of roofing nails needed for a roof in normal and high wind conditions.
- Number and Length of Metal Roof Panels - Computes the length and number of metal panels and trim pieces for a metal roof.
- Screws for a Metal Roof - Computes the number of screws needed for a metal roof.
- Number and Length of Purlins for a Roof - Computes the number of purlins for a roof based on dimensions and spacing.
- Number and Length of Rafters - Computes the number and length of rafter boards based on roof dimensions and spacing.
- Number and Length of Rafter and Collar ties - Computes the number and length of rafter ties and collar ties based on roof dimensions and spacing.
- Number and Length of wall top and bottom wall plates
- Number of Studs for a Room
- Number of Studs in a Wall
- Room Interior Area (wall and ceiling)
- Cubic Feet in a Room (volume)
- Number of 4x8 or 4x12 Sheets for a Room
- Number and Length of Floor Joists
- Number of Joist Hangers
- Compute the Cost of Floor Joists
- Compute iJoists for larger floors
- Compute the Number of 4x8 Sheets to cover the Deck or Floor
- Compute the number of Decking Boards to cover the deck or floor
Roofing Geometry Calculators