Common Installation Mistakes by NJ Bergen County Roofing Contractors


Here are some commons mistakes by New Jersey roofing contractors.

We ask that you take notice and ask these questions when you are meeting a roofing contractor for an estimate

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1. Not using enough nails for installation
Manufacturers give specific instructions on how to fasten shingles, but too often they’re improperly nailed.  When nail guns are used and the pressure is set too high, nails will be overdriven into the shingle mat.

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This increases the likelihood that they will blow off and leak, and voids the warranty. Similar problems result from underdriven nails.

In general, 4 nail per shingle meets the manufacturer’s specifications unless the roofing installation is in a “high wind area” or the slope of the roof is very steep–18:12, or greater. In these two cases, 6 nails per shingle is required.

I recommend 6 nails per shingles for any laminated shingle job. The reason being because if the roofer misses the nail line–which is extremely small–the nail won’t penetrate both halves of the shingle.

This, over time, with the effect of gravity, can cause the shingle to delaminate. The steeper the roof, the greater the potential problem.

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It only costs a few dollars more to install 6 nails per shingle and it is cheap insurance against delamination and blow-offs.
2. Neglecting the flashing

Your roofer should not cut corners by reusing old flashing on a new roof installation. There may be small punctures or other damage that could threaten the new roof. Insist on new flashing when your roof is installed.always make sure it is noted on the contract that NEW STEP FLASHING WILL BE INSTALLED.
I’ve got a brick chimney, does it reall y need reflashing?
Some roofing contractors will not reflash the chimney unless it is specified in the contract. It is time consuming work and takes a high degree of skill to flash a chimney properly.
A favorite line to get out of reflashing the chimney is, “Why fix something’ that ain’t broke?”
The truth is that if the chimney is not reflashed when the roof is installed, the chances of the chimney leaking in the next 3-5 years are very high!
If you’re going to make the investment of getting a new roof system installed on your home, ensure that the system will keep you dry for years down the road. Make sure that the contractor is specifying that the chimney will definitely be reflashed!

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