Shingles for Dormers

The Shingles for Dormers calculator computes the number of shingle bundles needed for one or more roof dormers based on the dimensions.

INSTRUCTIONS: Choose units and enter the following:

• (DD) Dormer Depth
• (DW) Dormer Width
• (P₂) Pitch of Dormer Gable (choose pitch from list)
• (P₁) Pitch of Main Roof (choose pitch from list)
• (n) Number of Dormers
• (SBS) Shingle Bundle Size 
  • 33.33 ft² for 3-tab standard shingles
  • 32.8 ft² for architectural shingles (default)
• (TO) Tolerance Adder for Safety Margin

Shingles for Dormers (SH): The calculator returns:

• (TA) Area: Total surface area of dormer(s) in square feet.
• (r) Ridge Length: Length of the dormer ridge in feet and inches.
• (j) Valley Length: Length of each individual dormer valleys in feet and inches
• (SH) Shingles: Number and max length of Metal Panels (36" wide coverage)
  • Ridge Shingles: Bundles of ridge shingles needed to cover the ridges.
  • Three Tab: Bundles of normal shingles needed to cover the dormers.
• (rN) Roofing Nails:
  • Normal Wind: Number of Roofing nails needed under normal wind conditions
  • High Wind: Number of Roofing nails needed under high wind conditions

Items with units can be automatically converted to compatible units via the pull-down menu.

The Math / Science

Safety Tolerances

An addition of the TO parameter (default of 3") s added to the following dimensions. 

• (r) Ridge Cap
• (sG) Snow Guard
• (j) Valley Trim
• (PL) Panel Length
• (aT) Angle Trim

It's better to have too much and have to cut it, than not enough.

Dormer Calculators

• Surface Area of Dormers: This computes the roofing surface area for dormers based on the dimensions and number of dormers.
• Metal for Dormers: This computes the metal roof materials (panels, ridge cap and trim) for one or more roof dormers based on the dimensions
• Screws for Metal Dormers: This computes the number of metal panels screws needed for one or more roof metal paneled dormers based on the dimensions.
• 4x8s for Dormers: This computes the number of 4x8 sheathing needed for one or more roof dormers based on the dimensions.
• Shingles for Dormers: This computes the number of shingle bundles needed for one or more roof dormers based on the dimensions. It also includes ridge shingles, valley lengths for flashing, and roofing nails.
• Underlayment for Dormers: This computes the amount of underlayment needed and estimates the cost of underlayment materials.
• Roofing Nails for Dormers: This computes the number and weight of roofing nails needed for one or more roof dormers based on the dimensions.
• Purlins for Dormers: This computes the total number and length of purlins (roof support boards) for needed for one or more roof dormers based on the dimensions.
• Dormer Geometries: This computes the diagram measurements for a dormer based on the dimension.

Roof Types

Roofing Calculators