For a 20-square roof, plan around 2,000 square feet of roof area before adding extra material for cuts and waste. The Certigrade cedar shingles are the clearest match for calculating coverage because the listing gives coverage per bundle: 25 square feet at 7-1/2-inch exposure, or 80 bundles for 20 squares before waste. The other relevant choices include asphalt, decorative cedar, and steel shingles. Compare material, listed dimensions, and intended use before ordering.
| Product | Material or style | Best suited for |
|---|---|---|
| Certigrade Resquared & Rebutted Shingles | Sanded shingles | Coverage-based planning |
| Rectangular Asphalt Roof Shingles | Asphalt, glass fiber, colored stone | Small roof repairs or decorative use |
| Western Red Cedar Fancy Cut Shingles | Western red cedar | Siding and architectural accents |
| Steel Roofing Shingles | Galvanized steel with basalt granules | Buyers comparing metal roofing |
Certigrade Resquared & Rebutted Sanded Shingles
Best for: Buyers who want a stated coverage figure to estimate material for a 20-square project. The listing says each bundle covers 25 square feet at 7-1/2-inch exposure and that four bundles make one square at that exposure.
Using the listed coverage, 20 squares equal 2,000 square feet, or 80 bundles before adding material for waste, cuts, or roof details. This makes the product the most straightforward option here for basic coverage math. The listing also notes that shingle width varies, so buyers should verify layout and installation requirements before ordering.
- Listed coverage: 25 square feet per bundle at 7-1/2-inch exposure.
- Listed quantity: four bundles per square at that exposure.
Limitation: Coverage depends on the stated exposure, and the listing says widths vary. Confirm actual project requirements with the installation plan.
Rectangular Asphalt Roof Shingles
Best for: Buyers considering asphalt shingles for a smaller repair or decorative roofing project. The listing gives a set of 21 pieces measuring 39.37 by 13.11 inches and states a total coverage area of 33.37 square feet.
The listed material combines asphalt, glass fiber, and colored stone. Product features describe water resistance, heat resistance, resistance to fading, and performance in high and low temperatures. Its colored surface is presented as a dimensional, layered design choice.
For a 20-square roof, compare the stated 33.37-square-foot coverage per set with the full 2,000-square-foot area, then account for waste and installation details. Do not assume that a single set is intended to cover a full roof section without checking the layout.
Limitation: The listing does not provide a per-square coverage rate or all installation specifications, so confirm suitability and quantity before purchasing for a large roof.
Western Red Cedar Fancy Cut Shingles
Best for: Buyers seeking a traditional cedar appearance for exterior siding, gable ends, dormers, accent walls, or restoration work. The product description identifies Western red cedar and a square-butt design for a uniform, classic look.
This option is selected for its clearly stated architectural uses and natural wood appearance rather than for quantified roof coverage. The listing describes dimensional stability and durability as product characteristics, but it does not state bundle coverage or exposure. That makes it harder to calculate the amount needed for a 20-square roofing job using the supplied information alone.
Choose this product if cedar style and the listed siding or accent applications match the project. For a full roof, verify that the product is appropriate for the intended roofing application and obtain the manufacturer’s coverage and installation details.
Limitation: No coverage quantity or roof-specific installation information is supplied in the product details.
Steel Roofing Shingles With Basalt Granules
Best for: Buyers comparing metal roofing panels with conventional shingle materials. The listing describes galvanized steel construction, a double-layer structure, and an outer basalt-granule coating. It also gives panel dimensions of approximately 57.2 by 16.5 inches.
The product details emphasize lightweight handling, color retention, and use in residential and commercial roofing applications. Those features may matter to buyers considering metal as an alternative to asphalt or concrete-style roofing. However, the listing does not provide a clear square-foot coverage figure per panel in the supplied information.
Before planning a 20-square order, confirm the exact usable coverage, overlap requirements, and installation instructions. Panel dimensions alone are not enough to calculate the number required because roof layouts and overlaps affect coverage.
Limitation: The supplied details contain unclear wording and do not state reliable coverage per panel, so verify specifications with the seller before ordering.
Buying Guide: How to Plan for 20 Squares of Shingles
What does 20 squares mean?
In roofing, one square commonly refers to 100 square feet of roof coverage. Therefore, 20 squares represent about 2,000 square feet. Measure the roof surface rather than relying only on the home’s floor area, since roof pitch, overhangs, and separate roof sections affect the total.
How many bundles should you order?
Use the coverage printed for the specific product. For the Certigrade shingles, the stated rate is 25 square feet per bundle at 7-1/2-inch exposure. Dividing 2,000 square feet by 25 gives 80 bundles before waste. Add an appropriate allowance based on roof shape, cuts, valleys, and the installer’s guidance.
Which material should you compare?
- Coverage clarity: The Certigrade listing provides bundle coverage and bundles per square.
- Asphalt: The rectangular asphalt option lists 33.37 square feet per 21-piece set, but confirm installation details and suitability for the roof.
- Cedar: The Western red cedar option describes a square-butt style and siding uses, but does not give roof coverage in the supplied details.
- Steel: The steel option lists panel dimensions but not clear coverage after overlaps.
What should you verify before ordering?
Check product coverage, exposure, dimensions, overlap, installation method, and intended application. Confirm whether accessories or underlayment are needed separately. For a large project, ask the supplier or roofing professional to confirm the quantity against the measured roof area and the product’s current instructions.
Frequently Asked Questions
How many square feet are in 20 squares of shingles?
Twenty roofing squares equal 2,000 square feet, using the common roofing measure of 100 square feet per square.
How many Certigrade bundles cover 20 squares?
At the listed rate of 25 square feet per bundle, 80 bundles cover 2,000 square feet before waste, at 7-1/2-inch exposure.
Should I order exactly the calculated amount?
Not necessarily. Cuts, roof shape, valleys, and installation details can increase material needs. Confirm the waste allowance with the installer or supplier.
Can the cedar shingles be calculated for a 20-square roof from this listing?
Not from the supplied product details. The listing does not state coverage per bundle or roof-specific exposure information.