Flat Roof Sagging

Even the highest quality materials don t last forever though.

Flat roof sagging.

Water damage from rain and snow can lead to a sagging roof. A wavy or sagging roof can be the result of one of several issues. When the roof framing is assembled two ceiling rafters are often joined together to create a longer span. Low quality materials are more prone to water and weather damage and generally deteriorate faster.

Sagging roof lines can originate with the horizontal ceiling rafters. So what happens with those elements is that you get more sagging and delamination of the roof sheathing. So just you know doing some surgical cutting of the drywall may not get you to a solution here. If structural damage or decomposition is to blame it may be best to tear out the section of roofing and repair the problem before filling the hole.

Excess weight along the roof can occur from snowfalls. The roofing structure should be in good condition to allow adequate water runoff from the shingles. Damage to the roof s surface permits an entryway for water and the subsequent weakening and sagging of the rooftop. Foundation problems with the house.

Why roofs sag as mentioned roofs sag because there s too much weight or load for the existing structure. Grab a flashlight and head up to your attic to inspect your roof rafters and decking specifically those where your roof is sagging. Sagging or low spots in a flat roof may be due to undersized or weakened roof joists or problems with the buildup layers beneath the exposed roofing. The most important step when fixing dips in a flat roof is to determine the cause of the problem.

Less common causes of a sagging roof poor quality roofing material and faulty installation can cause a roof to slump. Also inspect the metal or plywood gusset plates used where your wood meets on a truss look for damage that includes cracks rot breaks and any other impairment. Being nervous about a sagging roof is understandable. Fixing a truss or rafter.