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84c45496c9ae5e08f9f1ba10aef78c28Let’s face it. Our roofs don’t always get to bulk of our attention when it comes to maintenance. So one day you come home and realize your roof is sagging. Why is this happening? There are a few reasons why your roof has suddenly dropped in the middle.


If you apply too many layers of shingles to the roof, the weight will eventually cause the roof to sag. Shingles weigh approximately 3 pounds per square foot per layer. Even though shingle manufactures will allow 2 layers your roof may have not been designed for this.  If you start to add on additional layers beyond the maximum, the weight may cause the roof the sag in the middle. Other factors that add to roof sag and the weight of the roof are elements like snow and ice on the roof.  Another point to remember is that the lower the slope of the roof the greater impact items like additional roof material layers, ice, and snow will have on the structure.

Structural Damage

Structural design and damage can also add to roof sag. If the structure was not designed to hold the correct amount,  you may begin to see a sag. An example of this would be undersized rafters, spacing of rafters too far apart, and/or undersized plywood sheathing. Sagging will also happen if the structure is compromised in any way from things like rotting wood. If you think this could be the problem, the cause of this could be a leak that caused the wood holding the structure to become wet for long periods of time leading to rot.

So, what do you do? When it comes to your roof, it is always best to call a professional for safety reasons. Call Nauman Roofing at (570) 476-7606, and request a free consultation online here.