Common Mistakes When Installing Shingles and How to Avoid Them

 

Proper shingle installation is key to keeping your roof leak-free. Incorrect installation can shorten the lifespan of your roof and can void the warranty.

It is important to know that roof shingles can be damaged by many things. Knowing what these are and how to avoid them can help homeowners maintain the quality of their roofing materials.

Before you begin working, clear your yard of debris like large twigs and branches. This will allow for a clean surface for the shingles. Also, make sure to use chalk lines to ensure straight rows and proper overlapping.

Not Removing Previous Roofing Materials

Many homeowners hire roofers to install shingles in order to protect their homes from weather conditions. However, if the roofer fails to remove all previous roofing materials, it can cause severe problems in the future. For instance, if the underlayment is not fully removed, it can cause blistering and other problems with your roof.

Likewise, nailing correctly ensures that the shingles stay in place and prevents water leaks. It is also important to ensure that the flashing is properly installed around any vents, chimneys, skylights, or other roof penetrations.

If these areas are not properly sealed, it can lead to moisture damage and mold growth inside your home. It is important to work with a professional roofer who understands the manufacturer’s installation requirements for each shingle type.

Using a lot of bituminous mastic

Bituminous mastic is an acid-alkaline composition, suitable for use as a protective impermeable membrane against water ingress. It is used in flooring, tank lining and joint sealing for asphalt and concrete pavements preventing water ingress and freezing. 

It can also be used for filling surface cracks, ensuring a smooth and continuous surface. It is produced in different versions to meet specific industrial needs, depending on its technical characteristics.

Using too much mastic can cause blistering, so make sure you are using the right amount and that it is compatible with the shingles you are using. If you have any questions about this, talk to your roofing contractor.

Wrong shingles for hip and ridges

Some roofers use the wrong shingles for hip and ridge caps. They tend to cut a full shingle into three pieces and then use the smallest piece for ridge cap. This type of roofing installation can cause the shingles to delaminate, especially when bending over the ridge. It also shortens the shingle’s lifespan and can void the warranty.

It’s important to use ridge cap shingles that are specifically designed for the job. For example, IKO’s ridge cap shingles have pre-trimmed upper edges that make them easier to install and help create a cleaner finished look on the roof.

It’s also important to use a metal drip edge. Not doing so can cause damage to the roof deck and fascia boards, water infiltration into the home and shingle blow-off during windy weather conditions. 

Improper Shingle Alignment

Many people love asphalt shingle roofs because they are affordable, durable and come in a wide variety of colors and styles. However, these roofs are susceptible to a number of problems if the roof is not properly maintained or installed by an experienced professional.

One of the most common mistakes during shingle installation is improper alignment. This can result in a crooked appearance and create gaps for water to seep through the roof structure and into the home, leading to wood rot and mold growth.

To avoid this issue, professional roofers should use chalk line tools to ensure that the starter shingles are laid down in a straight line and that they remain consistent throughout the entire roof. 

Overlapping Shingles at Valleys

If your home has a valley between two roof planes, it’s important to know the different methods for installing shingles there. The most popular is a “woven” valley, in which shingles from one side are interwoven with those from the opposite side. This allows water to flow down the center of the valley and helps prevent leaks.

Another method for shingling a valley is to use a “California Cut” valley, which looks like a straight-cut valley but actually uses a system in which the shingles are allowed to overlap each other. This style is not recommended by shingle manufacturers, but it can work well for some homeowners.

Improper Flashing Installation

Flashing is a metal piece installed under shingles around areas like chimneys, skylights, vents, valleys, and walls to prevent water from seeping behind the shingles. If not installed properly, it can lead to moisture leaks, causing rot and mold. A professional roofer ensures flashing is correctly installed and sealed to act as a water barrier.

Using the wrong nail pattern when installing shingles can cause curling or loosening, potentially voiding the warranty and leading to costly repairs. Always follow the manufacturer's recommended nail pattern.

For step flashing, apply sealant under the first piece, then lay the shingles over it. Nail the shingle high to ensure proper coverage by the next row.

Lack of Protective Products

If you’re concerned about the lifespan of your shingle roof, it is a good idea to conduct regular inspections, especially following weather events like hailstorms. This will help mitigate long-term damage. Aside from a visual assessment, your roof should be regularly checked for the following:

The most common problem is granule loss, which occurs when the top layer of a shingle disengages from the asphalt. This is usually due to poor installation and can be prevented by choosing a roofing contractor that understands best practices.

A lack of granules reduces a shingle’s ability to repel water and resist sun damage. This will shorten its lifespan.

A lack of granules also exposes the underlayment to weather elements and moisture that can cause leaks and premature deterioration. Aside from preventing granule loss, a proper underlayment can prevent shingle damage and extend its lifespan.

Not Preparing for Weather Conditions

It's important that roofers prepare for their work by using protective clothing and working with appropriate tools. For example, roofing shovels and scoop shovels help to remove old shingles and nails safely.

A tarp should be placed beneath the area where debris is removed to protect the landscaping. A professional roofer will also use a roof brush or eco-safe cleaning products to clean the roof deck and remove any algae growth.

Flashing is an essential part of any roof as it helps to keep water out of your home. It is installed around any vents, pipes, chimneys or other special areas of the roof. It is important that roofers install the right flashing, and that they overlap it correctly during shingle installation.

Improper Pipe Collar Sealing

Many homeowners skip the step of installing a row of starter strips before laying down the first shingle row along the eaves and roof edges. This simple step helps prevent water infiltration. It also ensures that the nails used to secure the shingles are not crooked or under-driven, which can lead to premature shingle failure and leaks.

In addition, homeowners often fail to properly seal the area around pipe penetrations. This is a common mistake because a poorly-sealed gap between the shingles and the waterproof underlayment can cause moisture and water to seep into your home, causing wood damage and mold.

Incorrect Nailing

The number of nails that should go into a shingle and where they are located is vital. If the nails are not placed in the nailing zone (this varies from shingle to shingle) they will not be properly secured and can lead to blow-offs during windy conditions or leaks.

It is also important that the nails are not driven in too deeply. This voids the manufacturer’s warranty and can also lead to blown off shingles during stormy weather.

Conclusion  :  In conclusion, proper installation of roof shingles is critical for ensuring the longevity, durability, and waterproofing of your roof. Common mistakes, such as improper nailing, incorrect flashing, using the wrong shingles for ridges, and neglecting weather preparation, can lead to severe issues like leaks, mold, and premature roof failure. To avoid these mistakes, it is essential to follow the manufacturer’s installation guidelines, ensure proper alignment, and use the correct materials for each part of the roof.

Working with a professional roofer who understands best practices and taking the time to address critical details will help protect your home from costly repairs and ensure your roof remains in top condition for years to come. Regular inspections and maintenance are also key to prolonging the lifespan of your roof.