Asphalt shingles have evolved over time into different types, such as three-tab, dimensional, architectural, and interlocking. Interlocking shingles were designed to reduce and prevent wind damage on roofs and are installed differently from the other types. However, they’ve fallen out of favor for new homes and roof remodeling projects.
This article will discuss why interlocking shingles were popular, how they work, and why they aren’t used as much today.
What Are Interlocking Asphalt Shingles?
Interlocking asphalt shingles interconnect on all four sides, as opposed to thin standard shingles that only overlap. This system of interlocking tabs uses the weight of the surrounding shingles to prevent the shingles from lifting.
Interlocking shingles often carried a better warranty than their three-tab counterparts, making them attractive to homeowners in high-wind areas such as the Upper Midwest. They also provided a more textured, seamless look that some found appealing.
What Were the Drawbacks of Interlocking Shingles?
When interlocking shingles were conceived, many roofing experts thought the design solved a weakness inherent to older technology. However, a few significant drawbacks emerged that made them a less viable option. They included the following:
- Susceptibility to hail damage: When hail hits interlocking shingles, they absorb the shock, weakening the interlock over time. This is due to air getting trapped underneath the shingles, leaving them without solid support from the roof decking.
- Complex installation: To install interlocking shingles, roofers often needed specialized training directly from the manufacturer. Improper installation risked compromising the roof’s performance or wind resistance, defeating the purpose of the shingles.
- Limited repair options: Interlocking shingles were designed to work as a system, so repairing damaged sections proved challenging and often required complex procedures for a simple problem.
Should I Replace My Interlocking Shingle Roof?
While many interlocking shingle roofs are nearing the end of their lifespan, if you have one, you may not have to replace it yet. Many of these roofs are still in good condition and function as intended.
Get your interlocking shingle roof professionally inspected at least once per year. The inspector will check for signs of storm damage you may not be aware of and places where the roof is compromised. If your roof is severely damaged, you may need to replace it because replacement shingles are hard to come by.
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Modern Alternatives to Interlocking Shingles
Roofers now use modern shingle types for new roofs instead of interlocking shingles. These include dimensional shingles, impact-resistant shingles, and metal roofing.
Dimensional Shingles
Dimensional shingles are a common replacement for interlocking asphalt shingles. They address the same problems as interlocking shingles, but instead of holding the other shingles together, they use an extra layer of material on the exposed area. This makes them both heavier and thicker than traditional three-tab shingles.
Dimensional shingles are also easy to replace in large or small sections, and the repair doesn’t look like a patch from the ground. They have no pattern and some dimensional shingles will look different from others in the same bundle, so installers place them randomly so small defects don’t stick out.
Impact-Resistant Shingles
Roofers also use impact-resistant models of traditional three-tab shingles or architectural shingles instead of interlocking shingles. For more information on architectural shingles, read our guide to architectural shingles costs.
Impact-resistant shingles protect against damage from falling debris, making them ideal for areas prone to hail or severe weather. They can withstand impact without cracking or breaking and are easy to install and repair.
Related: GAF Vs. Certainteed Roofing Shingles Comparison
Metal Roofing
Metal roofing systems are a durable, long-lasting alternative to asphalt shingles. They offer excellent wind resistance and can last significantly longer than asphalt shingle roofs. Metal roofs are typically more expensive upfront, but their longevity makes them cost-effective over the life of the roof.
Interlocking asphalt shingles tend to break in heavy winds as they age and become brittle, so having them inspected often will usually identify potential problems before water damage occurs.
Can I Install Interlocking Asphalt Replacement Shingles Myself?
Generally speaking, non-professionals should not attempt to install interlocking asphalt shingles. Because these shingles are not installed like other fiberglass or asphalt versions, even those with roofing experience may struggle to install them. Most roofing contractors need training from the manufacturer to install these shingles due to their complexity.
This site receives compensation from the companies featured in this listing, which may impact where and how products appear. This listing doesn’t feature all companies, products, or offers that may be available.
