One of the most common defects we find with asphalt shingles is improper nailing. Manufacturers of asphalt shingles give specific instructions on how to fasten shingles, and they ’ re all about the same. unfortunately, following those instructions seems to be a difficult thing to do. The two most park breeze through defects we find with asphalt shingles are overdriven nails and improperly located nails .

Overdriven Nails

Most roofers use pneumatic pinpoint guns to nail down shingles. When the pressure is set excessively high, the nails get driven into the shingles excessively far, plain and bare. When the nails are overdrive, the heads of the nails punch right through the mat of the shingle. This voids the shingle manufacturer ’ s guarantee and greatly increases the electric potential for shingles to come unleash and blow off, possibly in sheets .
The diagram below shows what proper and improperly driven nails look like.

Shingle Nailing Diagram
The photograph below show several examples of overuse nails .
Overdriven Nails 1
Overdriven Nails 2
Overdriven Nails 3
Overdriven Nails 4
Overdriven Nails 5

Improperly Located Nails

The early most park smash defect we find with asphalt shingles is improperly located nails. The two most coarse issues are nail located besides high gear or besides first gear on a shingle. When nails are located too low on a shingle, it ’ s an obvious defect anyone with a good eye can much spot from the ground. This is credibly why we don ’ thyroxine find this blemish all that much ; it ’ south fair besides obvious for most roofers to leave uncovered .
Low Nail
This blemish can go on for a long time with no adverse effects, but there ’ s a good chance that any queer smash will finally lead to a roof leak. The photograph below show a 14-year-old ceiling with one uncover complete. It took a retentive time, but this finally caused a leak, which stained the finished ceiling below .



The more common and baffling nail down trouble is to have nails located too high on the shingle. There is a fairly narrow undress on every shingle where you ’ re supposed to place the nail. When you do it right, the nail will actually catch the top edge of the shingle below it, meaning every shingle gets a smash through it in the middle and at the top. When nails are located besides senior high school on the shingle, they never catch the shingle below, which effectively cuts the number of nails going into each shingle in half. Hopefully, my diagram below will help to illustrate this ; the blue dots are supposed to be nail heads .
High Nail Diagram
The photograph below show examples of high smash. Yes, I know what I did there .
High Nail 1
High Nail 2
When shingles are improperly fastened, they have a tendency to slide and rip out of the nails holes, and this won ’ deoxythymidine monophosphate be covered by the manufacturer ’ s guarantee .
Sliding shingles 1
Sliding shingles 2
Sliding shingles 3

When the entire roof covering is installed like this, there is no dim-witted fix. Either the new buyers need to accept the fact that their roof will be prone to having shingles blow off, or the roof covering will need to be repaired or replaced. For new construction homes, my recommendation is to have the manufacturer provide a letter explaining
Shingles Delivered on top of brand new roof
These initiation defects can ’ t be seen from the ground, nor can they be spotted with a drone. For this cause, you shouldn ’ metric ton expect most municipal inspectors to identify these issues ; it ’ mho outside the oscilloscope of their inspection. I wrote about this subject hera : Who Inspected Your Roof ? If you want a exhaustive roof inspection, hire a home inspector who walks roof .

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Category : Nail tips

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