Flat Roof Sagging

So what happens with those elements is that you get more sagging and delamination of the roof sheathing.

Flat roof sagging.

Weakened sheathing rotting joists and sagging insulation are some possible causes. Water damage from rain and snow can lead to a sagging roof. 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. Foundation problems with the house.

So just you know doing some surgical cutting of the drywall may not get you to a solution here. Damage to the roof s surface permits an entryway for water and the subsequent weakening and sagging of the rooftop. Even the highest quality materials don t last forever though. 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.

Why roofs sag as mentioned roofs sag because there s too much weight or load for the existing structure. 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. Most people without any construction experience know that a roof should be flat and not wavy or sagging. Fixing a truss or rafter.

Less common causes of a sagging roof poor quality roofing material and faulty installation can cause a roof to slump. Grab a flashlight and head up to your attic to inspect your roof rafters and decking specifically those where your roof is sagging. The roofing structure should be in good condition to allow adequate water runoff from the shingles. Excess weight along the roof can occur from snowfalls.

When the roof framing is assembled two ceiling rafters are often joined together to create a longer span. The most important step when fixing dips in a flat roof is to determine the cause of the problem. Being nervous about a sagging roof is understandable. Low quality materials are more prone to water and weather damage and generally deteriorate faster.