If your roof looks slightly curved or wavy in some areas, it often indicates a sagging problem. This tends to happen in roofs that suffer from long-term deterioration and haven’t been replaced in a long time. However, it may not always be due to the roof’s overall condition. Sagging can also be caused by other problems within your home, such as foundation problems. Top roofing company D&M Roofing explains how this happens.

Cracked or Damaged Foundation
Cracks and other types of damage to your home’s foundation often happen because the foundation has moved or shifted out of place. If the ground isn’t stable, it can cause foundation damage and lead to the floor tilting or sloping slightly. This may happen to foundations and slabs over time with minor damage.
In some cases, however, the damage can be more significant and can lead to a sagging roof. For instance, if your foundation has visible damage with the top of the cracks being wider than the bottom and resembling a “V” shape, this shouldn’t be ignored. The cracking must be checked by a professional before it can cause further damage to your home.
Undercutting and Poor Drainage
Undercutting happens when water erodes part of the soil supporting the foundation. This can be due to a damaged or leaking sewer line or a nearby stream or creek eating away the soil near the foundation. It can even be caused by your downspouts and how they discharge water runoff. This can lead to a sinking foundation, which can also cause your roofing system to bow or sag over time.
Subsidence Due to Nearby Trees
Your home may suffer structural issues that lead to your roof sagging because of tree roots and how they gather moisture and nutrients in the soil. Roots can be directly under your foundation, and once they gather moisture and nutrients, the remaining soil particles tend to shift closer together. When this happens, the soil becomes loose, resulting in the foundation shifting or moving over time.
D&M Roofing is a locally trusted roofing contractor offering top-notch services to homeowners in Canton and Akron, OH. If you have a sagging roof or any other roofing issue that needs immediate attention, give us a call at (330) 852-3800, or fill out our convenient online contact form for a free estimate.