A Few Mistakes To Avoid When Installing Asphalt Shingles

Posted on: 20 January 2019

If you have obvious shingle damage across the roof of your business, then it may be time for a full replacement. And, if you have some time on your hands and a great deal of construction knowledge, then you might want to try your hand at completing the replacement on your own. There are some fairly significant mistakes you can make when adhering new shingles to a roof, so keep reading to learn how to avoid them.

Mistake - Not Securing Shingles Well Enough

Roofing shingles do have an adhesive strip above the tabs, and the strip contains a petroleum-based material that allows the shingle to adhere strongly to the deck. And while it may act like a glue, it is not nearly strong enough to hold shingles in place. This is where the roofing nails come in, and they should be positioned on the solid strip so the tabs just above will cover them.

You will need to space out your nails evenly across the adhesive strip to ensure that the each shingle lies flat and cannot rip away from the deck. You will need four nails per shingle unless you live in a high wind area. In this situation, you want to use six nails.

In addition to securing the right number of nails, you want to make sure that you are purchasing enough nails before you begin the roofing project. You want to calculate how many roofing squares you need to cover. Three bundles of shingles are needed per square, and there are 29 shingles per bundle. So, you will need about 350 nails per square if you are adding four nails per shingle.

Mistake - Not Adding An Overlap

You will need to start your roofing project by installing shingles at the bottom and working your way up towards the ridge. And, you should install the first row so that it does not sit flush with the edge of the roof. You want there to be a slight overhang instead with about one inch of the shingles hanging over.

The overhang keeps water from working underneath the shingles where it can get under the fascia and cause it to rot. However, it is also not too long, or the wind may pull up the shingles from underneath and create damage.

In many cases, a drip edge should be added to the overhang area with the help of flashing, so make sure the flashing is wide enough to provide the protection that is needed.

If you want to know more about the installation of asphalt shingles, ask a commercial roofing company like JC Roofing & Insulating for an appointment.