2 Signs Your Shingled Roof's Decking Is Rotting Away
While looking at your roof to determine its condition, you may find that the shingles still appear tightly secure and in good condition. However, underneath the shingles is the roof decking, typically composed of plywood sheets, which just as important to the infrastructure of the roof. Unfortunately, you cannot visibly assess its condition because it is covered. Luckily, there are a couple of signs that you can look for when trying to figure out if the decking is rotting away.
1. You Notice Dips and Curves While Looking at Your Roof
When trying to determine the condition of your roof's decking, look for any sign of dipping or curving of the surface. The decking provides a stable surface on which the shingles lay, giving them support as well as something to anchor onto.
However, if the plywood has started to rot, the wood will start to bow under the weight of the shingles. When you inspect the roof while observing it from the ground, it will have a wavy appearance because the plywood is starting to sag.
2. You See Discolorations on the Rafters or Ceiling of Your Attic
If you do see areas where the roof is sagging, the next place to check for signs of rotten roof decking is in your attic. If your roof decking has reached the point that it is no longer able to support the weight of the shingles, there is a good chance that water has already started leaking through the roof.
While you are looking around in your attic, pay particular attention to the rafters and ceiling of the space. If it is currently raining, you may see wet spots. However, if the weather is dry, look for spots that seem discolored, indicating that the materials have been stained by water leaking in through the decking
If you notice either or both of the above signs, the roof decking under your shingles is most likely starting to or in the process of rotting away. Because the decking is a vital part of your roofing system, neglecting to take care of it as soon as possible can lead to severe water damage if it were to allow water leakage or even collapse. Contact a roofing contractor to have them inspect your roof to determine the extent of the current damage as well as discuss your options for either repairing or replacing the roof.