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What causes a sagging roof? Is it unsafe?

What causes a sagging roof? Is it unsafe?

If you see that your roof doesn't look like it's holding up like it used to, you may be seeing visible signs of sagging. A roof should maintain it's integrity at all times, so it's important that you visually inspect your roof often for any warning signs of trouble. Getting a professional inspection can remove any doubt, but here are the most common causes of a sagging roof that we see.

Poor construction

A sagging roof may be the result of poor construction, such as inadequate support or the use of substandard materials. This isn't too uncommon considering when a home is first built, the roof is done as quick as possible by the builder so they can work inside.


As a roof ages, it can become weakened and begin to sag. This is particularly common in roofs that are more than 20 years old. A roof doesn't last forever, and it's important to monitor its condition.

Water damage

A sagging roof may be the result of water damage, which can cause the roof decking to become weak and sag. Water damage can be caused by a variety of factors, including leaks, ice dams, and heavy rainfall.

Structural problems

A sagging roof may also be the result of structural problems in the house, such as a weak foundation or inadequate support. 


A sagging roof may be caused by the accumulation of excessive weight, such as from snow or debris. Combining with other factors, this can quickly become catastrophic.

If you have a sagging roof, it is important to have it repaired as soon as possible to prevent further damage. LA Design + Construction can assess the cause of the problem and recommend the appropriate repair or replacement to prevent a disaster!

Is a sagging roof unsafe? What are the risks?

Structural instability

A sagging roof can indicate structural instability in the home. If the roof is not properly supported, it can cause other parts of the house to become weakened or even collapse.

Water damage

A sagging roof can also lead to water damage in the home. If the roof is not properly pitched, water can collect and cause damage to the roof decking and the interior of the house.

Risk of collapse

A sagging roof is at risk of collapsing, which can be dangerous for anyone inside the house at the time.

Risk of injury

If a sagging roof collapses, it can cause serious injury to anyone inside the house or nearby.


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