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If you’re shopping around for alternative roofing materials to shingles, you’ll probably come across corrugated roofing panels. However, there are often flat counterparts, making you wonder which option is the best.
What Are Corrugated Roofing Sheets?
Corrugated roofing sheets have a wavy texture. From far away, they may look as though they’re striped. But when you look at them closely, you’ll see that one piece of material is shaped with undulating curves that span the length of the sheet.
Some materials have boxier ridges than others. In the roofing industry, these may not be labeled “corrugated.” Instead, some experts refer to this shape as “ridged.” However, ridges and grooves with squared-off corners have similar benefits and disadvantages as S-shaped corrugated roofing sheets.
What Materials Do Corrugated Roofing Panels Come In?
Not all roofing materials are corrugated. However, large panels tend to be. The most common types of corrugated roofing panels that you’ll find are made of:
Fiber cement – A safer alternative to cement-asbestos roofing
Fiberglass – A lightweight, translucent material that is often used for porch or pergola roofing because it lets the light in while protecting against rain
Cardboard-cement – This roofing product is designed to look like clay tiles and comes in a wide variety of colors
Polycarbonate – Virtually unbreakable plastic that is lightweight and often translucent
7 Reasons for Corrugated Roofing Sheets
There are several reasons to answer the question, “Why are roofing sheets corrugated?” Understanding these factors will help you make the best decision when choosing a covering for your home, outbuilding, porch, deck or pergola.
Added Strength
Take a flat sheet of paper, and wave it around in the air. Notice how it bends and curls fairly easily. It feels flexible and floppy.
Now, fold the paper like an accordion. Try to wave it in the air again. Now, it’s more rigid and maintains a relatively flat shape.
This illustrates how corrugation strengthens roofing materials. Corrugated roofing sheets are less likely than flat ones to bend under pressure.
This means that they resist sagging when they cover the large expanse of a roof. This is especially important when you’re dealing with snow or ice accumulation. Plus, corrugated panels won’t bend or crease while you’re moving or storing them, especially if you place them in a professional storage unit.
Enhanced Drainage
When it rains, water always makes its way to the lowest point on a surface. If you have a flat roof, any indentation will collect water, creating unequal pressure on the surface of the roof. This can lead to sagging, wet spots, moisture damage and roof cave-ins.
The corrugated valleys on a roofing panel are evenly spaced. Therefore, they distribute the weight of rainwater equally across the roof. These channels also act like narrow gutters, directing the water where you want it to go. Combined with an adequate drainage system, you can avoid moisture damage and safeguard the structure of your home by using corrugated roofing sheets.
Reduced Cracking or Warping
Warm temperatures cause roofing materials to expand, while cold temperatures lead to contraction. Your roof is particularly vulnerable to extreme changes in temperature because of its location. As the sun beats down on it, it expands, and it shrinks at night when the temperature drops.
A flat roofing panel that’s fastened securely doesn’t allow for as much freedom of movement as a corrugated sheet. The waves in the corrugated sheet let the material shift without affecting the position of the fasteners. Therefore, it’s less likely to crack or develop wear than a flat roofing panel.
Less Leakage
You might be surprised by the amount of water that can trickle into a tiny hole. Although roofers take measures to seal your home tightly and prevent leaks, they have to create holes in the material every time they insert a fastener.
With corrugated roofing sheets, the holes are created in the peak of the crown, where water doesn’t collect. Therefore, you’re less likely to experience leaks from these spots.
Hide Imperfections
Panel roofs often have exposed fasteners. On a flat roof, the fasteners may be obvious because they interrupt the smooth surface. However, the lines on a corrugated roof distract the eye from imperfections. Therefore, you’re less likely to notice the fasteners or other blemishes on the surface that may detract from the building’s curb appeal.
You should note that standing seam metal roof panels are often designed with an alternative fastening system. If you don’t like the look of visible fasteners and want a flat panel roof, you can use a product that uses a series of clips instead of screws for installation.
Versatile
You don’t have to limit corrugated roofing panels to the top of your structure. They can be used in a variety of ways, including as walls, for fencing or for collecting rainwater without gutters.
Ease of Installation
You don’t need special skills to install a corrugated metal roof. On the other hand, installing a roof with flat panels or standing seams requires a more complex skillset. In many cases, you can install a corrugated roof over existing asphalt shingles, which is not a possibility with flatter panels.
Pros and Cons of Flat Roofing Sheets
When you’re comparing flat roofing sheets with corrugated ones, you’ll likely find that there are more disadvantages than advantages. Some of the most common problems that are associated with flat roof panels include:
Warping – Flat roofing sheets are susceptible to warping. In fact, even new sheets may have a slight bend or bulge to them. If you gaze at a flat roofing panel with your eye level with the surface, you’ll likely notice this. The warped appearance gets worse over time as the material settles, expands and contracts.
Shows damage easily – When flying debris, like a falling branch or hail, hits a flat roof, it’s likely to make a mark. The flat surface doesn’t resist damage like a stiff corrugated one would. Multiple dents on a flat roof can look unsightly and lead to further damage down the road.
Noisy – Flat roofing panels often make noise as they expand and contract. You might hear popping noises in the early morning or evenings as the material adjusts to the current temperature.
Should You Use Flat Or Corrugated Roofing Sheets?
Corrugated roofing sheets are ideal for do-it-yourself projects, longevity and money savings. However, they’re not recommended for every roof. Your roof must have a slope of 3 to 12 inches to benefit from a corrugated roof. This type of roofing is not suggested for flat roofs.
If you have room in your budget and want to minimize the potential for leaks, you might not opt for the exposed-fastener system that is necessary for a corrugated roof. In that case, you might look for a flat panel system with hidden fasteners or choose a different roofing material altogether.
Finally, check the gauge of the roofing material before you make a selection. Corrugated metal roofs come in thinner gauges than standing seam panels, which need to be thicker because their shape is not self-supporting.
Ultimately, an experienced roofer will be able to guide you through the process of selecting a roof. Choosing the right option now will provide you with protection for years to come.
Both aspiring and existing property owners should pay attention to one important part of the roof. We are pertaining to what we call roofing sheets. More than the visual value that they add, they are installed for a reason. Different types of roofing sheets shield the actual roof from external elements. When mounted correctly, it helps prevent leaks and potential damages to prolong your roof’s lifespan.
Roof sheeting has different variations that can match your needs and requirements. Each has its own pros and cons that you can take into consideration. Remember that roofs are a huge financial investment so it is better to be hands-on. Hence, it is a vital step to know what types of roofing sheets are available before you decide.
At Sterling Roofing Group, we commit to deliver the highest quality of service that you deserve. Since 1996, we have been around the industry providing superior roofing products and services to homeowners and commercial property owners. Because we value our clients, we give full attention down to the smallest details.
Today, let us talk about the different types of roofing sheets. Know what to expect and see what options you have.
From the word corrugated, this type of roofing sheet has repetitive folds. The corrugation that it forms intensifies the roof’s integrity. This option is for people looking for environmental-friendly materials.
This is widely used for various purposes due to its proven durability (as compared to its flat counterparts). It is ideal for garages, sheds, carports, porches, etc.
You can narrow down your choices under these categories by choosing which material and finish you would like to go for. We have highlighted four types of corrugated roofing sheets to expand your options:
It is a carbon steel sheet coated with zinc produced through continuous hot dip process. This can be used either bare or painted.
This is most commonly used for agricultural structures due to its medium-length lifespan. Although it is a cheaper option, it needs to be maintained every five or ten years. Installation and maintenance are crucial for it is prone to scratches.
Plastisol is a steel sheet that treated with a primer paint. PVC is then rolled on top of it. Known for its durability, PVC plastisol coated sheets do not fade or scratch easily. It is expected to last up to 30 years. It is also weather-resistant and lightweight.
Corrugated roofing sheet made from bitumen is waterproof. It is long-lasting and highly durable.
Sheet metal roofing sheets are similar to the corrugated ones in terms of composition. However, they have significantly fewer curves manufactured from metals like stainless steel or aluminum. Metal roofing sheets have a protective layer made up of zinc. Then, they are reinforced with another layer of chromatic acid that prevents rusting.
Characterized by superior roof coverage, they are mostly used for garages, backyard sheds, garden buildings, household cladding, industrial roofing, and many more. Despite its strength and durability, they are lightweight and easy to install. It comes in various finishes and colors to match your requirements.
Sheet metal roofing sheets are extremely weatherproof with excellent insulating capabilities. The standard thickness of the material prevents leakages.
You can expand a metal roofing sheet’s lifespan by coating it with aluminum asphalt.
These types of roofing sheets are often used in large commercial and industrial buildings due to its promising performance. Polycarbonate is fire-resistant. Although it is more durable than other roofing materials, they have the tendency to crack.
Made from high-impact polypropylene resin, polycarbonate roofing sheets are lightweight, extremely durable, and easy to cut. Being pH neutral, these roofing sheets have the ability to withstand contrasting temperatures while maintaining stability. Even harsh chemicals have no effect on them. Another advantage of polycarbonate is that it could act as an insulator reducing the heat that passes through the roof.
Property owners can choose from a wide variety of special finishes like UV protection, corrosive inhibitors, and anti-static. Apart from this, there is also a variety of customizable colors available.
Plastic roofing sheet may be the least durable among the choices you have but it has its own advantages. Most people use the plastic material for smaller structures and for temporary constructions. Its durability is dependent on the type of plastic that you will use for the roofing sheet. The more robust the material is, the more it will cost. Another good thing about it is that it costs a lot cheaper than slate roofs.
It is a good idea to explore what other roofing materials are out there. Expanding your knowledge will help you come up with more informed decisions as an existing or future property owner. Moreover, it also empowers you as an individual giving value to your hard-earned money.
Apart from the traditional roofing materials like shingles, tiles, felt, etc., there are other options in the form of various types of roofing sheets. The next time you plan for a new roofing construction for your property, you can always go back to this list and see what material fits you best.
While it is good to be familiar with what materials are available, it is equally important to hire a trusted roofing contractor. Your convenience and security rely on your ability to partner with a company that will treat your property as their own. Hire only experts that have proven reputation in the industry.
Are you looking for a reliable roofing contractor for your roofing requirements?
Sterling Roofing Group is a team of professionals trained to deliver highest-quality roofing service. From inspections, repairs, installations, and replacements, you can rely on our excellent workmanship coupled with the use of premium materials.
Feel free to contact us today for further assistance or inquiries. You may call or text us via 902-702-2946. We will discuss your needs and provide a free estimate.
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