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
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.
Single Price Survey Data
The Roofing Shingles Cost Survey list the observed price of a bundle of shingles. A bundle is equal to roughly (33 1/3 ft2) or one third of a roofing square (100 ft2). The survey includes a date, the name of the store, and the five price points for shingles: economy, low, median, high and premium.
One should use the pricing for roofing materials that can be bought locally. However, the following prices are for different quality grades of shingles in the United States:
All prices are for one bundle of shingles which cover 33.33 ft2.
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.
- 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