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:
- Shingle Price Survey Online Source : Lowes
- Shingle Price Survey Date: 12/22/22
- Cost of Premium Shingles: $90.0 USD.
- Cost of High Grade Shingles: $52.34 USD.
- Cost of Medium Grade Shingles: $43.32 USD.
- Cost of Low Grade Shingles: $37.98 USD.
- Cost of Economy Grade Shingles: $36.0 USD.
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.
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