SPECIFICATION: 2-Car Detached Garage, Pole Barn, Workshop
24×30 Garage Roofing Calculator (Bundles & Squares)
A 24×30 foot building with 12-inch overhangs has a roof footprint of 26×32 feet (832 sq ft). At a standard 4/12 pitch (1.054 slope multiplier), the true rafter deck measures 877 square feet. With a standard 10% cutting contingency, you require 9.6 squares (29 bundles of architectural shingles).
BUILDING FOOTPRINT720 SQ FT BASE
ROOF PITCH (SLOPE)4/12 Pitch
Fastener Specification:
Architectural Roof Profile & Pitch Cutaway
PITCH: 4/12 (18°)GABLE ROOF
True Roof Deck Area:
877 sq ft
Shingle Yield:
9.7 Squares (30 Bundles)
Architectural Shingle
Synthetic Underlayment
3/4" OSB Roof Decking
Drip Edge & Ridge Vent
Complete Roofing Takeoff List
FIELD SHINGLES:30 Bundles9.7 Squares (3 bundles/sq)
STARTER STRIP:2 Bundles119 lin ft eaves/rakes
RIDGE / HIP CAP:1 Bundles32 lin ft ridge/hips
SYNTHETIC FELT:2 Rolls1,000 sq ft (10 sq) / roll
ICE & WATER SHIELD:2 Rolls200 sq ft / roll (eaves & valleys)
DRIP EDGE METAL:14 Sticks10 ft metal flashing sticks
Frequently Asked Questions: 24×30 Garage Roofing Calculator (Bundles & Squares)
How many bundles of shingles for a 24x30 garage roof?
For a 24x30 garage with 12" overhangs and a 4/12 pitch, you will need 29 bundles of architectural shingles (or 10 squares total including 10% waste contingency).
How many rolls of synthetic underlayment do I need?
One 10-square roll (1,000 sq ft) of synthetic roofing felt will cover the entire 877 sq ft deck with sufficient lap overlap.
How much drip edge is required for a 24x30 gable roof?
You will need approximately 13 pieces of 10-foot drip edge metal flashing (accounting for 10% lap overlap at corners and seams) to trim the eaves and rakes.