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Sagging Roof: Causes and Solutions

There are many different types of roofing issues. They can range from minor, isolated leaks and natural deterioration to major and far more serious problems like exposed underlayment due to missing shingles or deformed flashings. The latter, of course, almost always require extensive repairs or, if the roof is nearing the end of its serviceable life, a full replacement.




If you notice a somewhat large dent or depression on the surface of the roof plane, it means it has sagged. It requires professional attention, but before finding out the best course of action for this particular problem, you must first know what’s caused it to happen. Here's everything you need to know about roof sagging and what you can do to resolve it.

What Causes a Roof to Sag?

Roof sagging can occur on residential roofing systems because of the following circumstances:

  • Wind Load

Never underestimate the power of strong winds, especially during storms. Depending on the strength and speed in which the wind blows, it can put extra load to your roof, causing it to sag. This comes in two types, shear and lateral load. The former refers to the horizontal wind force that can be powerful enough to tilt and topple the roof from the home’s structure. The latter, meanwhile, is the horizontal pressure that occurs while the wind is blowing. Here, the push-and-pull effect can cause the roof to dislodge from its attachments, resulting in its destruction.

  • Multiple Roof Layers

Tearing off the old roof to make way for the new roofing materials and components is the most common (and ideal) method of roof replacement. However, some roofers perform what is called a roof overlay, which is a method in which the new roof is installed on top of the old one. Doing this, however, can lead to disastrous results. For one, the attic ventilation is compromised. The fact that the old roof isn’t removed prevents these roofers from knowing whether there’s damage underneath. You also run the risk of rendering your roof warranties void. The worse part: the additional weight of the new roof being placed onto the existing roofing structure increases the likelihood of sagging.

  • Moisture Damage

The structural components that hold the roof in place – rafters and trusses – are often made of wood or wood composite. Unfortunately, these materials are likely to succumb to the damaging effects of moisture. It can seep through the inner layers of your roof in many different ways, and once it reaches the attic and the roof’s wooden structures, gradual deterioration occurs, which leads to sagging.

Solutions to Minimize Roof Sagging

Roof sagging can lead to a variety of issues, including water leaks, ceiling damage and even structural damage to the rest of your home. If not addressed, your home, your family and your belongings could be at risk. Fortunately, there are ways to mitigate or lessen the likelihood of sagging on your roof. These include the following:

  • Complete Roof Tear-Off

When planning a roof replacement, make sure that the method of installation involves the removal of the old shingles, flashings and underlayment. From there, you get to know if the decking or sheathing needs to be repaired first before installing the new roofing materials and components. Be sure the pros you work with for this project are capable of dealing with potential water damage. This is to give you peace of mind knowing your new roofing system sits on a sturdier and stronger foundation.

  • Roof and Gutter Maintenance

Inspections and maintenance is integral to the longevity and performance of your roofing system. Be proactive about these so you keep your roof dry and free of moisture. Pay close attention to your gutters as well. Make it a point to clean them during seasonal transitions to ensure there are no clogs that may cause water runoff to back up and seep through your fascia boards and the rest of your roof. The last thing you want is to deal with indoor leaks due to a lack of roof and gutter maintenance.

  • Adequate Ventilation

Another way to reduce the likelihood of roof sagging is by making sure the roof’s ventilation system is in working order. When working with roofing pros for a roof repair or replacement, ask them to have the intake and exhaust vents checked. Make sure there are no obstructions; otherwise, excess heat and moisture can build up inside the attic. Both heat and moisture can increase the chances of sagging.

Replacing Your Sagging Roof

If there’s evidence of sagging on your roof, you must be quick to address it. Professional roofers can perform a thorough inspection of your roof’s entire structure and provide the most suitable solution. More often than not, they’ll be recommending a complete replacement, which is a sensible option as this helps eliminate the issues that cause sagging. With a new roof, you can be sure it can protect your home from the harsh weather, ensure the safety of your family and keep your property in sound condition overall.

To ensure the success of this project, however, you need to work with reliable roofing contractors. Leaving the job to a team of experienced and reliable professionals gives you the assurance that it is completed according to local building codes and regulations and meets standards set forth by the manufacturers behind the roofing system.

When it comes to top-notch roofing services, you don’t have to look further. For homeowners all over Southern California, A1 Quality Roofing, Inc. is the name to remember and get in touch with in the area. We have been in business since 1991 and have over 100 years of combined experience in the roofing industry. We are also fully licensed, bonded and insured for your peace of mind. No matter the size or complexity of the roofing project, you can rely on our trained and skilled team to finish the job promptly and efficiently while ensuring quality workmanship.

Get in Touch With Us Today!

A1 Quality Roofing, Inc. specializes in a wide range of residential, commercial and industrial roofing services. Whether you need roof repair, maintenance or waterproofing, expect us to get it done to your satisfaction. We serve all of the counties of Riverside, Los Angeles, Orange, San Diego and San Bernardino. Call (951) 877-4406, or fill out our contact form to request an estimate.

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