Flat Roof Sagging

Sagging roof lines can originate with the horizontal ceiling rafters.

Flat roof sagging. Less common causes of a sagging roof poor quality roofing material and faulty installation can cause a roof to slump. The roofing structure should be in good condition to allow adequate water runoff from the shingles. The other thing that causes this type of sag is an excessively long roof rafter without proper bracing and in old house that s not so unusual. The most important step when fixing dips in a flat roof is to determine the cause of the problem.

Water damage from rain and snow can lead to a sagging roof. 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. 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.

Fixing a truss or rafter. 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. When the roof framing is assembled two ceiling rafters are often joined together to create a longer span. Even the highest quality materials don t last forever though.

Why roofs sag as mentioned roofs sag because there s too much weight or load for the existing structure. So what happens with those elements is that you get more sagging and delamination of the roof sheathing. Most people without any construction experience know that a roof should be flat and not wavy or sagging. 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. Excess weight along the roof can occur from snowfalls. Foundation problems with the house. A wavy or sagging roof can be the result of one of several issues.