Applying the Right Pressure is Essential
If you do not apply the correct amount of pressure to a nail properly (under-driven), it will leave the nails too high which will result in a hump in the shingle above it, which is putting your roof at risk of damage. For example, wind can then blow up and under the shingles causing it to lift and blow off, or overtime, it can rub through the top shingle causing a nail “pop” (the nail “pops” through) which in turn will cause a leak, damaging your roof and resulting in you having to pay more money to fix. Luckily this is avoidable if the right amount of pressure is used in each nail. 50 North Roofing uses the hand-nailing method to ensure each nail is properly applied to the roof, eliminating any potential raised nail.
Contrarily, if too much pressure is applied then nails are considered “over-driven” or “blown through”. They will not hold the shingle because the nails have been blown too deep which will cause the shingles to potentially slide down the roof or blow off because there is nothing holding the shingle down.
When hand nailing, the head of a hammer is much larger and when it hits the nail, it lands flat on the roof’s surface. It’s very abnormal to have nails that have been over-driven when hand nailing simply because they don’t have the pressure from the compressor like the air guns do.
When installing shingles over the roof’s decking, a lot of the nails get driven between the wood, which in turn needs to be removed and replaced to an improved location. Hand nailers can feel when this happens and can easily make corrections as they go. Air nailers can’t feel this so they become overlooked and eventually, nails will rise and leaks will happen.