Last updated: March 2026
How Many Bundles of Shingles Per Square?
The standard is 3 bundles per square for both 3-tab and architectural asphalt shingles. One square covers 100 square feet. So for a 2,000 sq ft roof: 2,000 ÷ 100 = 20 squares × 3 = 60 bundles (before waste).
Always add 10-15% extra for waste, which accounts for cuts at hips, valleys, edges, and starter courses. For a complex roof with many angles, use 15%. For a simple gable roof, 10% is usually sufficient.
Asphalt vs Architectural Shingles
3-tab shingles are flat, uniform, and budget-friendly ($90-$100/square). They last 15-20 years and are rated for 60-70 mph winds. They're the most basic option and increasingly being phased out.
Architectural shingles ($100-$150/square) have a layered, dimensional look that mimics wood shakes. They last 25-30 years, are rated for 110-130 mph winds, and are now the industry standard. Most professionals recommend architectural for their better value per year of service.
Frequently Asked Questions
How many bundles of shingles do I need?
3 bundles of shingles cover 1 square (100 sq ft). Calculate your roof area, add 10-15% for waste, divide by 100 to get squares, then multiply by 3. A 2,000 sq ft roof needs about 22-23 squares = 66-69 bundles.
How many bundles per square?
Standard asphalt shingles (both 3-tab and architectural) require 3 bundles per square. Some specialty or heavy shingles may need 4-5 bundles per square — check the manufacturer's specifications on the packaging.
What is the difference between 3-tab and architectural shingles?
3-tab shingles are flat with a uniform look, lasting 15-20 years. Architectural (dimensional) shingles are layered for a textured appearance, last 25-30 years, and are more wind-resistant. Architectural cost 10-50% more but are now the standard choice.
How much does a bundle of shingles weigh?
A bundle of 3-tab shingles weighs about 60-70 lbs. Architectural shingles weigh 65-80 lbs per bundle. That's 200-240 lbs per square. A full roof of 25 squares means about 5,000-6,000 lbs of shingles — plan accordingly for delivery and storage.
Can I install shingles over old shingles?
Most building codes allow one layer of re-roofing (shingling over existing shingles). However, it's generally better to tear off the old roof first: it allows inspection of the decking, ensures proper underlayment installation, and won't void manufacturer warranties.
How long does it take to shingle a roof?
A professional crew of 3-4 workers can typically complete a standard residential roof in 1-3 days. A DIYer might take 3-7 days. Factors include roof size, pitch, complexity (valleys, dormers), weather, and whether tear-off is included.