`"Purlins" = "Shed Roof 4x8s"`

Enter a value for all fields

The 4x8s for a Shed Roof calculator computes the total number of 4x8s needed to cover a single sloped roof based on the span, ridge length and the front and back overhangs.

INSTRUCTIONS: Choose units and enter the following:

• (L) Ridge Length (include rakes)
• (S) Span
• (P) Pitch (choose: flat,1/12,2/12,3/12,4/12,5/12,6/12,7/12,8/12,9/12,10/12,12/12,14/12)
• (oH) Overhang (default: 12")
• (MoE) Margin of Error (added to the calculated Truss Length)

4x8s for Shed Roof (TL): The calculator returns the number of 4x8s for the roof.  The calculator also returns the square feet of the roof.

The Math / Science

A Shed Roof is a roof with a single slope (see picture).  Shed Roofs are used in simple agriculture buildings and state of the art modern buildings.  The 4x8s for a Shed Roof calculator is meant to help with material estimates for a roof.  The rafter length uses the pitch (rise over run) and the span, which is the width plus the two overhangs (front and back).  

In all cases, confirm your estimates with a professional estimate and adhering to local building codes.

Roof Calculators

• Gabled Roof
  • Area of Gable Roof
  • 4x8 Sheathing for Gable Roof
  • Cost of Sheathing for Gable Roof
  • Purlins for a Gable Roof
  • Metal for a Gable Roof
  • Shingles for a Gable Roof
  • Cost of Shingles for a Gable Roof
  • Nails for Gable Roof Sheathing
  • Roofing Nails for a Gable Roof
• Hip Roof
  • Surface Area of a Hip Roof
  • Purlins for a Hip Roof
  • Metal for a Hip Roof
  • Shingles for a Hip Roof
  • Cost of Shingles for a Hip Roof
• Shed Roof
  • Trusses for a Shed Roof
  • 4x8s for a Shed Roof
  • Shingles for a Shed Roof
  • Cost of Shingles for Shed Roof
  • Purlins for a Shed Roof
  • Metal for a Shed Roof
  • Metal for a Shed (Roof and Walls)
• Dormers
  • Metal for Dormers
  • 4x8s for Dormers
  • Shingles for Dormers
  • Purlins for Dormers

Roofing Geometry Calculators

• Pitch to Slope
• Pitch to Angle
• Rise over Run to Angle
• Interface Angle
• Interface Angle from Rise over Run

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. 26.6^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.
• 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