The answer to 'roof decking clogged gutters' is that clogged gutters can lead to water damage in the roof decking. Clogged gutters prevent proper drainage, causing water to back up and seep into the roof decking. This can lead to rot, mold, and structural damage if left unchecked. To address this issue, you'll need to clear the gutters and inspect the roof decking for any signs of damage.
If the roof decking is only slightly clogged, you may be able to clear the gutters yourself using a gutter scoop or by hand. However, if the decking is significantly damaged, it's best to call a professional roofing contractor to assess the extent of the problem and make any necessary repairs.