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The importance of nail placement
The placement of each roofing nail will eventually determine the durability of roof shingles. Shingles are designed to be nailed on a specific location and the nail must be driven to a certain depth. Usually the nailing location is situated ± 25 mm above the cut-out and 25 mm from the end. However, on our laminated Cambridge shingles the position of the nails is between the two white lines which we also call the nailing lane or zone.
Every roofing nail must penetrate the wooden deck with a minimum of 19 mm. If this position or depth of the nail is off by even a little, water might penetrate inside or the shingle may be blown off in high winds. IKO’s manufacturing warranty coverage might also be voided if the inspection finds that the reason of the problem was incorrect nail placement.
For more tips on proper nailing, take a look at this blog.
Pros and cons of manual nailing
Supporters believe that hand nailing shingles gives them more control over the fastening process. They can use a certain “feeling” to determinate if the nail is deep enough and applied on the right location. Especially when working on a roof deck made of wooden planks this “feeling” can be useful. Wooden plank deck sheathing can contain many gaps, which the roofing nail can accidentally be driven into. The roofer working with a hammer can feel this and can quickly repair it with a second nail aside and glue the loose nail with a little bit of mastic.
Hand nail installers are quick to feel a nail miss in the wooden deck while nail gun operators have to rely more on sounds and intuition. Hand nailing might take a bit more time but there is the chance to correct mistakes on the spot. Due to the slower installation, labor costs will be higher. The material however will be lower, because shingle hatchet or hammer is cheaper than a nail gun.
Pros and cons of nailing with a nail gun
Roofing contractors who use a nail gun often believe that this pneumatic tool provides the same level of precision as hand nailing a shingle. But it’s important for the roofers to always test their tools before using them.
Over-pressured or under-pressured nail guns can cause over-driven nails. This brings potential risk and damage to your shingle roof. Nails that are applied too deep can cut the fiber-mat inside of the shingle, which can reduce their resistance to withstand high winds. In some cases shingles can even slide down the roof. Under-driven nails are too high and can cause a lift up of the shingle above, which might result in blow offs or cuts through the upper shingle.
