Improperly nailing shingles is one of the most common mistakes committed by inexperienced roofers. It is also one of the most common causes of roofing failure. In this blog, roofing company Spicer Bros Construction, Inc. shares an overview of the importance of correct shingle nailing.
Proper Shingle Nailing
Different roofing products require different installation procedures, but shingle nailing is more or less the same across products. At least four nails should be used per shingle, each driven at the right depth and angle. Steep-sloped roofs may have as much as six nails per shingle. It’s also important that the right size nail be used for the type of shingle.
Improperly Driven Nails
Most roofing contractors use pneumatic nail guns to nail down shingles. With this technique, it’s critical that the pressure is set correctly. Too much pressure drives the nails too far in, resulting in nail heads that punch right through the shingle mat. This results in shingles that can be easily torn off by the wind. Overdriven nails may also void your roofing warranty.
The other extreme is high nailing, or what can be called as “under-driven” nails. In this case, the pneumatic gun may not have enough pressure to drive the nail in, resulting in protruding nails. This results in loose shingles that can be pried off during a storm. It can also damage the shingle. Failing to install the nails at the correct angle results in a similar effect as under-driven nails.
Improperly Located Nails
Most of today’s asphalt shingle products feature dotted lines that help guide installers on proper nail placement. Place the nails too low, and the nail heads will be readily visible from the ground, and may affect the adhesive lining on the shingle. Place the nails too high and the hold won’t be as strong. The nails should also be evenly spaced per shingle for even stress distribution, which helps reduce the chance of tear-offs during a storm.
Choosing a manufacturer-certified contractor can help avoid such problems. As a CertainTeed® SELECT ShingleMaster™, our installers at Spicer Bros Construction, Inc. have received factory training and certification. In addition to having in-depth knowledge of CertainTeed’s roofing systems, we are also authorized to offer the brand’s industry-leading warranties.
Spicer Bros Construction, Inc. is your leading provider of roofing installation and repair services. Give us a call at (410) 546-1190 (Salisbury) and (302) 703-6754 (Delaware). You can also fill out our contact form to schedule an in-home consultation. We serve customers in Salisbury and Ocean City, MD.
