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Top 10 Roofing Mistakes

Price Roofing • Apr 30, 2020

Common Mistakes in the Roofing Business


The cost of fixing a roof to a new home is very expensive yet necessary. When the roof is not properly fixed, due to the use of inferior materials or poor workmanship, it can incur more cost for the homeowner as time goes on. 

Here at Price Roofing we have seen these mistakes over and over again while doing roof inspections in the Naples area.  

Below are 10 mistakes that is frequently associated with roof making. 

1. Using nails wrongly. 
Shingles can easily slip down when not properly nailed or when few nails are used to hold them down. It is advised you use minimum of four nails for a shingle, and if working on a very steep roof, a minimum of six nails is required. You should avoid driving nails above or into the self-sealing strip. 

2. Incorrect shingle projection. 
The shingles' edge should be slightly projected from the roof at a distance of an inch or an inch and half or when using a drip edge flashing it should be between half an inch and three-quarter inch. When the overhang is projected too much it can be easily blown off by strong winds; when it's just a little, water will easily move into the fascia or rake boards. 

3. Wrong installation of starter shingles (or not fixed at all). 
Many homeowners try to fix their roofs by themselves and in most occasion make the mistake of not installing the “starter" section in the shingles to lie on the eaves, this causes water to get in contact with the sheathing that is below the shingles' cutouts at the bottom. 

4. Improper installation of valley flashing. 
A common mistake done by some amateur roofers or ignorant contractors is to fix the valley flashing alone. Flashing should rather be placed under the shingles and not on top of it, and the metal's U -shape should conveniently be opposite the valley. This is to avoid water from slipping into unwanted areas, making the flashing or the speed shingle to quickly deteriorate.

5. Valley flashing not being properly secured is something that we see in many inspections. 
It is necessary you use enough sealant when putting a new metal flashing on a roof valley, this is because the roof valley can easily leak due to the large capacity of running water that goes through it. When not properly sealed or secured, water leakages can easily develop. 

6. Improper exposure of shingles. 
It is suggested to use a five-inch exposure when using a basic three-tab shingles. When the exposure is shortened the shingles are vulnerable to moisture from rainstorm or they can be easily blown off by the wind. 

7. Making no plans for an ice dam. 
For those residing at extremely cold places, formation of ice dams can occur at the roof-line and this might cause water to leak down the shingles if the roof is not properly insulated. You can prevent this by adding an Under layer of about three feet or more to serve as a protective layer to prevent ice water from melting. 

8. Improper Slope. 
It is important you get the materials that match the slope of the roof so as to avoid water from slipping into the home. For example, it is required that while installing a wood, tile or asphalt shingles and shakes, you ensure that your slope is twelve units of run for every four units of rise. 

9. Not providing enough vents for ceilings and attics. 
It is very important to provide vents for easy passage of air when placing shingles for the roof. Ensure air can easily flow from the ceilings and attics in order to avoid moisture from building up and then causing the shingle materials to get weak prematurely. 

10. Poor alignment of shingles. 
An easy way to spot a job not done properly is by the arrangement of the shingles. When the cutout on the three-tab shingles is not straight enough and the placement of the butted joints are not horizontal enough, then there is a misalignment of the shingles.

These are the 10 most common roofing mistakes that we’ve seen while inspecting roofs in Southwest, FL. If you would like help inspecting your roof, that’s our specialty.  

Roofer confused while installing a new roof

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