`"Roof "_"Sheathing" = "roundup"(("Roof Area" ft^2)/(32 ft^2)) `

Enter a value for all fields

The 4x8 Sheathing for a Gable Roof calculator computes the total surface area of a roof, the number of 4x8s and framing nails needed for a gabled roof based on the length, span, pitch and overhang.  

INSTRUCTIONS:  Choose units and enter the following:

• (L) Ridge Length (Includes overhang)
• (S) Span of Roof.
• (oH) Overhang 
• (P) Pitch of Roof

4x8s for Roof Area (n): The calculator returns the following:

• surface area of the roof in square feet and the following:
• number of 4x8 sheets to cover roof area
• number of framing nails (note this assumes using clips between 4x8s and not blocking)

The Math / Science

The length, span, pitch and overhand determine the surface area of a roof.  Based on that, one can roughly calculate the number of 4x8s by dividing by 32 ft².  

The nails for fixing a 4x8 to roof trusses or rafters is based on edge and field spacing of the nails (see below). Clips (c) are used between the boards.  This algorithm assumes an edge spacing of 6 inches, and a field spacing of 8 inches.

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Roof Types

Roofing Calculators

Gable Roof Area of Gable Roof Gable Roof 4x8 Sheathing Gable Roof Sheathing Cost Purlins for a Gable Roof Metal for a Gable Roof Screws for Metal Gable Roof Shingles for a Gable Roof Gable Roof Shingle Cost Underlayment for Gable Roof Nails for Gable Sheathing Roofing Nails for Gable Roof Rafters and Ties for Roof Rafters Length	Hip Roof Surface Area of Hip Roof Sheathing for Hip Roof Shingles for Hip Roof Roofing Nails for Hip Roof Cost of Shingles for Hip Roof Metal for Hip Roof Screws for Metal Hip Roof Purlins for Hip Roof Underlayment for Hip Roof Surface area for Double Hip Roof Hip Roof Geometries	Shed Roof Bundles of Shingles for Shed Roof Cost to Shingle a Shed Roof Underlayment and Cost for Shed Roof 4x8s for Shed Roof Metal Panels (Ag Panels) for Shed Roof Screws for Metal Panel Shed Roof Purlins for Shed Roof Trusses for Shed Roof Metal for Shed Roofed Animal Run-in
Dormers Surface Area of Dormers Metal for Dormers Screws for Metal Dormers 4x8s for Dormers Shingles for Dormers Roofing Nails for Dormers Purlins for Dormers	Pyramid Hip Roof Shingles for a Pyramid Roof 4x8 Sheathing for Pyramid Roof Underlayment for Pyramid Roof Metal Panels for Pyramid Roof Purlins for Pyramid Roof Pyramid Roof Geometries	Roofing Geometries Pitch to Slope Pitch to Angle Rise over Run to Angle Interface Angle Interface Angle from Rise over Run Trusses Needed for a Roof Area of Roof Section
Gambrel Roof Gambrel Roof Surface Area Gambrel Roof Shingles  Roofing Nails for Gambrel Roof Gambrel Roof Underlayment Purlins for Gambrel Roof Gambrel Roof Metal Panels Screw for Metal Gambrel Roof

Building Calculators

• Total Building Materials Calculator
• Roofing Calculators
  • Metal for a Roof - Calculates the number of metal panels for a roof.
  • Area of a Roof - Computes the area of a roof based on the pitch and the dimensions of the area covered by the roof.  It also returns the number of 4x8 sheets to cover the roof, the number of standard bundles of shingles to cover, and the number of roofing nails for both normal and high wind environments.
  • Pitch of a Roof - Computes angle of incline in the roof in both degrees and rise over 12" run (e.g. 26.6^o : 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.
  • Shingles needed for a roof - Calculates the number of standard bundles (33.3 ft²) of shingles for 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.
• Framing Calculators
  • 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
• Floor Construction Calculators
  • 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