Bundle of Cedar Shingles Coverage: How Much Does One Bundle Cover?
Meta description: Learn how much roof area a bundle of cedar shingles covers, how exposure and shingle type affect coverage, and how to estimate bundles for a roofing project.
Estimating a cedar roof starts with a deceptively simple question: how much does one bundle cover? A common planning estimate is about 25 square feet per bundle, or four bundles per 100-square-foot roofing square. But that figure is not universal. Shingle size, installation exposure, product packaging, roof details, and waste can all change the amount needed. The most reliable estimate comes from the coverage information on the specific product and the roof’s measured area.
Typical Coverage Per Bundle Of Cedar Shingles
For many cedar-shingle roofing products, a useful preliminary estimate is approximately 25 square feet per bundle. Since one roofing square equals 100 square feet, that works out to about four bundles per square. This is a budgeting shortcut—not a specification that applies to every brand, grade, or installation.
Coverage is determined by how much of each shingle remains visible after the next course overlaps it. That visible portion is called the exposure. A shingle installed with a smaller exposure covers less roof area per piece, so more shingles and bundles are required. A larger exposure generally covers more area, provided it is allowed by the manufacturer and appropriate for the shingle and roof conditions.
Packaging also varies. Bundles may contain different quantities or sizes of shingles, and products described as cedar shingles are not necessarily interchangeable with cedar shakes. The package label or manufacturer’s installation guide should state coverage at specified exposures. When that information is available, it should take priority over a general online estimate.
What “Coverage” Means On A Cedar Roofing Project
Roofing coverage refers to the surface area that installed material can cover—not simply the flat footprint of a house. Roof slopes increase the actual surface area, and ridges, valleys, hips, dormers, and other details can require extra material. A house with a 1,500-square-foot floor plan, for example, does not necessarily have 1,500 square feet of roof.
Roofing materials are often estimated in squares. One square represents 100 square feet of roof surface. If a product covers 25 square feet per bundle at the intended exposure, a 1,000-square-foot roof would require 40 bundles before adding waste: 1,000 divided by 25 equals 40. The estimate changes if the product’s published coverage differs.
Why Cedar Shingle Exposure Changes Bundle Coverage
Cedar shingles are installed in overlapping courses. Each course covers part of the course beneath it, and the exposed portion determines how many courses are needed to cover a given roof height. The exposure is generally measured from the lower edge of one course to the lower edge of the next.
For example, a smaller exposure means more courses per roof slope. More courses use more shingles, which reduces the roof area covered by each bundle. Increasing exposure can reduce material use, but it is not simply a way to make a bundle go farther. The permitted exposure depends on the product, shingle length and grade, roof slope, and installation instructions. Excessive exposure can leave the roof more vulnerable to weather.
Use the exposure specified for the product. Do not calculate coverage using a larger exposure than the manufacturer allows. Local building requirements and the project’s design may also affect installation details.
Cedar Shingles And Cedar Shakes Are Different
Shingles and shakes are both wood roofing products, but their shape and manufacture differ. Cedar shingles are generally sawn and have a comparatively smooth, uniform appearance. Cedar shakes are typically thicker and may be split or resawn, creating a more textured profile. Their dimensions, installation methods, and coverage can differ.
That distinction matters when comparing bundle estimates. A coverage figure for cedar shakes should not be applied to cedar shingles, or vice versa. Product listings may also use terms such as “roofing square,” “coverage per bundle,” or “bundles per square.” Those figures only make sense when tied to the specified product and exposure.
How To Calculate The Number Of Bundles Needed
A practical estimate has three parts: determine the roof area, select the product’s coverage at the planned exposure, and add an appropriate allowance for waste and details.
- Measure the roof surface. Use roof plans or measurements of each slope. If only the building footprint is known, adjust for roof pitch and include additions, porches, and dormers.
- Find product coverage. Check the package, product data sheet, or installation instructions for square feet per bundle at the intended exposure.
- Divide roof area by bundle coverage. The result is the number of bundles before waste. Round up to whole bundles.
- Add a waste allowance. Account for cutting, sorting, damaged pieces, valleys, hips, ridges, and the roof’s complexity.
Formula: Bundles required = roof area in square feet ÷ published square feet per bundle, then multiplied by the waste factor.
Suppose the measured roof area is 1,200 square feet, and the chosen product covers 25 square feet per bundle at the specified exposure. The base estimate is 48 bundles. With a 10% allowance, the estimate becomes 52.8, which should be rounded up to 53 bundles. The 10% figure is an example, not a rule; a contractor may recommend a larger or smaller allowance based on roof layout and product condition.
Estimating Roof Area From Building Dimensions
A building’s footprint is only a starting point. A sloped roof has more surface area than the horizontal area beneath it. For a simple gable roof, an estimator can calculate the area of both roof planes using their measured length and slope length. More complex roofs should be measured plane by plane or calculated from reliable plans.
Roof-pitch multipliers can help convert a horizontal plan area to sloped surface area, but they are approximations and depend on the pitch. They do not account for every overhang, dormer, valley, or change in roof shape. For a material order, accurate roof measurements are more dependable than applying a single multiplier to the home’s floor area.
Waste, Cuts, And Roof Details
Some material is routinely lost to trimming, defective pieces, and fitting around roof features. A simple roof with few penetrations may need less extra material than a roof with many valleys, dormers, hips, and intersecting slopes. Cedar’s natural variation can also lead an installer to sort pieces for color, grain, or quality.
Waste is not the same as coverage. The published coverage describes what a bundle covers under stated installation conditions; the waste allowance is added to the total project estimate. Contractors commonly use a project-specific allowance rather than one universal percentage. A complex design, repairs, or a requirement to retain matching material may call for additional bundles.
Ridge caps and other specialty components may require separate materials or calculations. The main field-shingle coverage figure should not automatically be assumed to include them. The estimate should identify whether ridges, hips, starter courses, and other accessories are included.
Coverage Estimate At A Glance
| Item | How It Affects The Estimate |
|---|---|
| Published bundle coverage | Sets the base area covered by one bundle at the stated exposure. |
| Shingle exposure | Smaller exposure typically requires more material per square foot. |
| Roof surface area | Must reflect the sloped roof planes, not only the home’s footprint. |
| Roof complexity | Valleys, hips, dormers, and penetrations can increase cutting and waste. |
| Product type | Cedar shingles and cedar shakes may have different coverage and installation requirements. |
| Accessories | Ridge, hip, and starter materials may need separate quantities. |
Common Estimating Mistakes
- Assuming every bundle covers 25 square feet. This is a common estimate, not a guarantee. Confirm the product’s stated coverage.
- Confusing roof area with floor area. Roof slopes and overhangs add surface area.
- Using the wrong exposure. A coverage calculation is valid only when it matches the product’s installation instructions.
- Mixing shingles and shakes. Their coverage and installation requirements can differ.
- Forgetting accessories and waste. Field coverage alone may not include ridge or hip materials, cuts, or damaged pieces.
- Rounding down. Bundles are typically purchased as whole units, so the final quantity should be rounded up.
Buying Cedar Shingles With Confidence
Before ordering, compare the exact product name, grade, dimensions, and exposure—not just the phrase “cedar shingles.” Ask the supplier for written coverage per bundle at the planned exposure, and confirm whether the quantity includes only roof-field shingles or also includes specialty pieces. If the product is being installed by a contractor, the contractor’s takeoff should be checked against the manufacturer’s instructions.
It is also useful to ask how additional material will be handled. Cedar is a natural product, and appearance can vary between lots. Keeping a small amount of matching material for future repairs may be helpful, but the appropriate reserve depends on the product and the owner’s plans.
Reliable Sources For Product-Specific Coverage
For an accurate order, the product’s technical documentation is the most important source. Manufacturer instructions provide the exposure and installation conditions behind a coverage estimate. The Cedar Shake & Shingle Bureau offers information about cedar roofing products and installation, while the National Roofing Contractors Association provides roofing guidance and contractor resources. Local code officials can clarify applicable requirements for a particular project.
In short, about 25 square feet per bundle is a useful starting point for many cedar shingles, but the exact coverage depends on the product and exposure. Measuring the roof surface, following the manufacturer’s coverage data, and allowing for project-specific waste produces a much more dependable bundle estimate.