Corrugated asphalt roofing sheets offer a lightweight, water-shedding roof covering for sheds, barns, workshops, and other outbuildings. Often sold as bitumen roofing sheets, they combine a molded corrugated profile with asphalt-saturated fibers. Their low weight and straightforward handling can make them appealing for small projects, but they are not a universal substitute for metal roofing or asphalt shingles. Performance depends on the product, roof design, installation details, and local building requirements.
What Are Corrugated Asphalt Roofing Sheets?
Corrugated asphalt roofing sheets are flexible, profiled panels made from organic or cellulose fibers that are impregnated or coated with asphalt. The raised and recessed waves form channels that guide rainwater down the roof. Manufacturers may also use mineral pigments, surface coatings, or other additives to improve appearance and weather resistance.
They are distinct from corrugated metal panels, which are typically made of steel or aluminum, and from asphalt shingles, which are installed in overlapping individual pieces. Asphalt sheets cover a wider area per panel than shingles and are generally lighter than many rigid roofing materials. Product names and formulations differ, so the manufacturer’s technical data sheet is essential when comparing options.
In the United States, buyers may encounter the term bitumen corrugated roofing as well as corrugated asphalt roofing sheets. Some products are designed primarily for sheds and agricultural buildings, while others may have tested ratings for broader uses. A product’s appearance alone does not establish that it is appropriate for a particular building or climate.
Common Uses
These panels are most often used on smaller structures where a lightweight roof is useful and the owner wants a simple, economical covering. Typical applications include garden sheds, storage buildings, workshops, barns, animal shelters, and covered equipment areas. Some products can also be used for patios or carports, provided the structure, roof pitch, and product specifications allow it.
They may be installed over new roof framing or used as a replacement covering after the old roof has been removed. However, installing new sheets over an existing roof is not automatically acceptable. The supporting structure must be sound, the new roof assembly must manage water properly, and local rules may restrict reroofing over existing materials.
Corrugated asphalt sheets are generally less common on primary homes than asphalt shingles, standing-seam metal, or other residential roofing systems. A manufacturer’s stated application, code documentation, fire classification, and warranty should be checked before using them on a dwelling or occupied building.
Advantages And Limitations
| Feature | Potential benefit | Important limitation |
|---|---|---|
| Weight | Panels are typically lightweight and easier to handle than many rigid coverings. | Lightweight construction still needs secure fastening and adequate framing. |
| Installation | Large panels can cover a roof quickly when the layout is simple. | Incorrect overlaps, fasteners, or edge details can cause leaks. |
| Sound | The material may be less noisy in rain than some exposed metal roofs. | Sound performance depends on the full roof assembly and building interior. |
| Cost | Some products have a relatively low purchase price for small projects. | Underlayment, trim, fasteners, labor, and repairs add to total cost. |
| Durability | Suitable products can provide service for years when installed correctly. | Life span varies with product quality, UV exposure, weather, and maintenance. |
The main attraction is often a combination of low weight, broad coverage, and comparatively simple handling. The sheets can be cut with appropriate tools, although cutting should follow the manufacturer’s instructions. Their corrugated shape also helps direct water toward the eaves, while the asphalt-based material does not rust in the way unprotected steel can.
There are tradeoffs. Asphalt-based sheets can become brittle or deteriorate with prolonged sun exposure, severe weather, or poor installation. They may not offer the same impact resistance, fire performance, or expected service life as some alternatives. Wind uplift, snow loading, hail, and heat can be especially important in exposed locations. No roofing material is maintenance-free.
How Much Do Corrugated Asphalt Roofing Sheets Cost?
Prices vary by brand, sheet size, thickness, finish, retailer, and region. Online and local retail prices can change, so a current supplier quote is more useful than a single national estimate. For a meaningful comparison, buyers should price the complete roof system rather than the panels alone.
The total project budget may include sheets, ridge caps, eave or verge pieces, underlayment, compatible screws or nails, flashing, delivery, disposal of old roofing, and labor. Roof complexity also matters: valleys, skylights, chimneys, and multiple edges increase cutting and detailing work. Small projects may have a higher cost per square foot because of minimum order charges or leftover materials.
To estimate quantities, measure the roof slope rather than relying only on the building’s footprint. Account for the panel’s effective coverage width after side laps, as well as the required end laps. Add extra material for cuts and damage, using the manufacturer’s guidance. A supplier or roofer can check the takeoff before ordering.
Choosing The Right Product
Check Roof Pitch And Coverage
Every product has a minimum roof pitch and prescribed overlap. A shallow roof drains more slowly and may require greater end laps, additional underlayment, or a different roofing system. The required slope and overlap are product-specific; one manufacturer’s instructions should not be applied to another brand by assumption.
Review Ratings And Local Requirements
Ask for documentation covering wind resistance, fire classification, and any applicable code evaluation. Building codes are adopted and amended by state and local jurisdictions, so requirements can differ across the country. A permit may be required, especially for a dwelling, a structural change, or work in a regulated area. The local building department can confirm the rules.
In wildfire-prone areas, fire performance is a critical consideration. A roofing material’s rating does not by itself establish that the complete roof assembly meets local requirements. Underlayment, decking, eaves, and other components can affect the assembly’s performance. Owners should verify the approved assembly with the manufacturer and local authorities.
Consider Climate And Exposure
Wind exposure, snow, hail, intense sun, and coastal conditions all affect material selection. A low-weight sheet may require closer attention to fastening and edge details in high-wind areas. Where snow is common, the roof structure must be designed for local loads, and the roofing product must be suitable for the slope and expected conditions. Product literature should state any limits.
Color and finish can influence appearance and solar heat absorption, but they do not replace proper attic ventilation or insulation. For a heated building, the roof assembly should be designed to control condensation and moisture, particularly where indoor air is humid or the building is tightly sealed.
Installation Basics
Installation details vary by product, so the manufacturer’s instructions take precedence over general advice. A typical project begins with checking that rafters or purlins are sound, properly spaced, and aligned. The roof must have the required slope, and the structure must be capable of carrying the applicable loads. Damaged decking, rot, or inadequate framing should be addressed before covering the roof.
- Prepare the roof. Remove loose debris and confirm that the substrate, eaves, and framing are in suitable condition. Install underlayment or support battens only when and as directed for the selected product.
- Plan the layout. Start at the eave and position sheets so that side and end laps face away from prevailing weather where the instructions specify. Keep panel edges straight and use the prescribed overhang.
- Fasten correctly. Use the specified fasteners and locations. Many corrugated roofing products require fasteners placed at particular points on the profile, often with a washer, but details differ. Overdriving can crush or distort a sheet; underdriving can leave the roof insecure.
- Complete overlaps and edges. Follow the stated side-lap, end-lap, ridge-cap, verge, and flashing details. These locations are common leak paths when parts are improvised or installed out of sequence.
- Inspect the finished roof. Check fasteners, laps, edges, and penetrations, and clear debris from drainage channels and gutters.
Roof work involves fall hazards, even on small sheds. OSHA’s fall-protection requirements apply to many construction activities, with specific rules depending on the work and site. Workers should use appropriate fall protection, ladders, footwear, and handling practices. Roofing should not be attempted in wet, windy, icy, or otherwise unsafe conditions.
Maintenance And Expected Service Life
There is no single dependable life-span figure for all corrugated asphalt roofing sheets. Longevity depends on the exact product, installation quality, roof pitch, exposure, ventilation, and maintenance. The product warranty can help clarify coverage, but a warranty is not a guaranteed service-life prediction; exclusions and installation conditions matter.
Inspect the roof periodically and after severe storms. Look for loose fasteners, lifted edges, cracked or damaged sheets, failing sealant, clogged gutters, and leaks or stains inside the building. Replace damaged pieces promptly using compatible components. Avoid walking directly on unsupported panels unless the manufacturer provides a safe method; stepping between structural supports can damage the sheets or cause a fall.
Corrugated Asphalt Sheets Compared With Other Roofing
Metal roofing is often selected for durability, fire resistance, and a wide range of residential and agricultural uses. It can cost more upfront, and rain noise may be noticeable in some assemblies. Coatings and fasteners require attention to prevent corrosion or leaks.
Asphalt shingles are widely available in the U.S. and are commonly used on homes. They offer familiar installation methods and a broad range of styles, but require a suitable roof deck and more individual pieces. Their performance also varies by product and installation quality.
Polycarbonate panels can transmit daylight and are common for greenhouses or covered outdoor spaces. They are not interchangeable with opaque asphalt sheets: UV protection, expansion allowances, condensation, and light transmission must be considered.
The best choice depends on the building, local code, climate, budget, and desired appearance. For a small utility structure, corrugated asphalt sheets may be practical. For a house or a building with demanding fire, wind, or snow requirements, a different system may be more appropriate.
Questions To Ask Before Buying
- Is the product approved for this building type and roof pitch?
- What are the required side laps, end laps, fasteners, and support spacing?
- Does the manufacturer provide code, wind, and fire documentation relevant to the location?
- Which underlayment, ridge caps, flashing, and trim are compatible?
- Does the warranty cover the intended use and installation method?
- Will a permit or inspection be required by the local building department?
Reliable product information is available from the manufacturer’s installation guide and technical data sheet, the local building department, and the applicable building code. In the U.S., OSHA provides construction fall-protection guidance, while the International Code Council publishes model codes that jurisdictions may adopt or amend. Checking these sources before purchase helps ensure the roofing system is suitable, correctly installed, and compliant with local requirements.