Interlocking asphalt shingles are installed similarly to ordinary shingles, with the distinction that they connect. Asphalt is used to make interlocking shingles for long-term wear resistance. While choosing interlocking shingles for your roofing job, pay attention to the guarantee that comes with the shingles. Many manufacturers provide a 20-30 year warranty. Based on the shingle grade picked, the guarantee may be longer or shorter.
Why are they not recommended?
Interlocking asphalt shingles have been discovered to have problems over a period. And that's because, after the advent of dimensional shingles a few decades previously, manufacturing was halted. The issue with them is that they are designed incorrectly.
Since these shingles connect in all 4 directions, airflow was held beneath, resulting in a pucker. As a result, the clenched region of the shingle would not lay precisely flat, and the roof decking would provide no stability. Paradoxically, this aggravated the issue that the shingle was supposed to solve.
The most prevalent problem with them was that they were extremely vulnerable to rain and other dirt particles.
The built-in glue strip on 3 tab shingles wasn't really usually capable of maintaining the shingle properly on the roof deck as they are lightweight. In stormy situations, the shingle's thin structure would often lead it to bend onto itself, shattering it. Clearly, this resulted in dampness issues, but other roofing choices were limited at the period.
When the interlocking design was first developed, it seemed to address many of the issues that came with traditional three-tab shingles. Unfortunately, that wasn't always the case in practice. Most roofing contractors needed to take training only to be certified to install and warranty interlocking shingles since they needed a very particular setup.
Is the interlock roof shingle vulnerable to hail?
The shape of these shingles often resulted in air being trapped beneath them. Because 3-tab asphalt shingles are light, they require strong backing to resist hail storms or even other falling objects.
Small hail pebbles could commonly bounce off 3-tab shingles, but interlocking roofs could absorb the shock owing to the absence of assistance from the roof decking. The potential of these shingles to connect with the neighboring shingles was frequently damaged if they were affected.
This effectively nullified the shingle's intended remedy by drastically reducing the roof's useful life.
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