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6 Warning Signs and Causes of Roof Sagging 

Posted on February 8, 2024

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6 Warning Signs and Causes of Roof Sagging 

Roof sagging is a major structural problem that should be addressed immediately. There are a few ways you can fix roof sagging. Otherwise, if left unattended, it will likely lead to a roof collapse. If you aren’t sure if your roof is sagging, stick to this blog post till the end. Today, we are going to discuss some major signs of roof sagging and the reasons behind it. But first, let’s understand what roof sagging is.

What Is Roof Sagging? 

roof sagging

As you may have noticed, roofs are built straight. They have no curves, waves, or rippling structures underneath. In many cases, they simply have two slanting planes that meet a peak at the top.  However, this isn’t true in the case of a sagging roof. A sagging roof develops a concave curve, dips, or depression over time, which results in a structure that is distorted from the original. A sagging roof isn’t only an eyesore but also a potential hazard for the occupants living underneath. If left unfixed, it can result in a roof collapse. 

Roof sagging is a structural problem that results from various causes, which we will go over later. Before that, let’s go over some signs of roof sagging. 

Signs That Your Roof Is Sagging

While roof sagging is usually easily identifiable, sometimes the signs can be more subtle. 

1. Disturbed Curb Appeal

Is your roof looking uneven? It could be because of sagging. Roof sagging sometimes produces a wave-like pattern throughout the shingles, creating dips and bumps. This unevenness may not be immediately visible, but if it is over a significant area, it is likely to be seen from a distance. In general, a sagging roof is unappealing and decreases the curb appeal of your home. 

2. Damaged Insulation 

Another aspect that a sagging roof can affect is the roof decking and, consequently, the roof insulation. If you notice displaced insulation inside the attic, it might mean something is compressing it or pushing it down. Moreover, damaged insulation can leak the air outside the attic, affecting the overall energy efficiency of your home. 

3. Damaged Roof Rafters or Trusses 

A sagging roof can also result from damaged roof rafters or trusses, which create the roof structure. If you notice a broken section of the underlying structure, its effect might appear on the other side. Damaged roof rafters or trusses can create further potential problems, such as cracked shingles and roof leaks down the line. 

4. Cracks on Ceilings and Walls

If your roof is sagging, it can affect the walls and the ceilings in your home. A sagging roof often indicates structural issues, and this uneven stress distribution can put added pressure on the walls, leading to cracks or damage. 

5. Sagging Roof Ridge 

The dips and curves along the roof ridge is another common sign of roof sagging. This uneven peak is caused by the movement or weakening of the underlying structure. A sagging roof ridge can be concerning, as it can affect your home’s energy efficiency, curb appeal, and overall performance of the roof. 

6. Wind and Rain Coming in the Attic

Even if the effects of roof sagging are small or you have not noticed any visible effects on the roof, wind and rain coming into the attic are telltale signs of an issue. A sagging roof, as mentioned above, can damage the roof decking and cause gaps in the shingles. This can allow light, wind, and rain to come inside the attic. 

What Causes Roof Sagging?

Though roof sagging often occurs because of underlying structural damage, there are other factors that contribute to it.  

1. Delayed Roof Replacement

If your roof is above its estimated lifespan or you have delayed a roof replacement, the chances of roof sagging are higher. Furthermore, if you delay replacing your roof even after you notice signs of roof sagging, then it can be more dangerous to residents living underneath. An older roof is more susceptible to problems, so it is important to inspect and replace it as soon as possible. 

2. Added Weight on the Roof Surface

If you have snow piled up on your roof, it can cause roof sagging. Excessive amounts of snow can weaken the roof deck and the underlying structure due to the added weight. Plus, any melting snow can seep into the roof deck, causing rot and roof sag. Therefore, you must remove the piled up snow with a roof rake.  

Also, for your roof to be sturdy, the deck needs to be up to code. Read our blog post to know: Is Your Roof Decking Up To Code?

3. Water Pooling Around the Gutters

If your gutters are overflowing due to the heavy rain, water may back up onto the roof and pool around the edges. And since gutters are installed along the roof edge, the water can seep into the roof deck and weaken the underlying structure. This prolonged exposure to water in such a critical area can cause roof and gutter sagging. 

4. Lack of Maintenance

Clogged gutters, damaged insulation, and ice dams are signs of a lack of maintenance. A poorly maintained roof welcomes potential problems, and roof sagging is one of them. By taking care of your roof regularly, you can prevent any future damage and save money on expensive repairs. 

How Much Roof Sagging Is Acceptable?

Homeowners often ask us how much roof sagging is acceptable, but generally, the answer is none. At A. Fricker Roofing & Waterproofing in Tulsa, OK, we believe that no amount of roof sagging is acceptable, even if it is limited to a tiny portion. You should fix the roof sagging as soon as you spot it. We always recommend homeowners call a professional roofer for a roof assessment and repairs. 

How To Fix A Sagging Roof

Fixing roof sagging isn’t a DIY project, and is where professional roofers come in. Even if you are a skilled DIYer, fixing roof sagging is not recommended. Jacking up a sagging roof is a tedious process that should be best left to professionals. It requires skills, knowledge, and experience to properly repair the damage. 

However, if you want to know the process of fixing a sagging roof, refer to our comprehensive guide: How To Fix A Sagging Roof

Contact A. Fricker Roofing & Waterproofing In Tulsa, OK, For Your Roof Repairs

If you spot signs of sagging on your roof, don’t wait to call professional roofers. A. Fricker Roofing & Waterproofing in Tulsa, OK, is a leading roofing company with years of experience in the industry. We serve both home and commercial building owners in Tulsa for their roofing needs. If you need to fix roof sagging and repair your damaged roof, contact us today. Just give us a call at (918) 402-7167 and consult a professional for your roofing needs.