How To Repair A Sagging Flat Roof

Also inspect the metal or plywood gusset plates used where your wood meets on a truss.

How to repair a sagging flat roof.

Grab a flashlight and head up to your attic to inspect your roof rafters and decking specifically those where your. Cut a 45 degree angle so the edges will be properly mitered for a clean look. Roof patch putty can be applied using a trowel to fill low areas. Each side of the iron should be four inches wide with the entire piece being at least two feet long.

Once you have established how much the roof sag needs to be jacked up lay a 2x4 plate across the ceiling joists and nail directly under the ridge of the roof. You can also use a general epoxy concrete filler and apply mastic on top using a trowel. Using a utility knife make a shallow cut until you can remove material around the spot without damaging the layers underneath it. Cut around the damaged area until the membrane rests flat.

On the other hand a property owner might replace the shingles with materials that are inappropriate for the roof s acceptable weight limit such as installing clay tiles in lieu of wooden shingles. Liquid fillers a variety of liquid patching materials are appropriate for fixing low spots on flat roofs. Determining the problem determine where the sag is in your roof in relation to your attic. The ideal fix is to remove all the excessive shingles and replace them.

Sometimes doing that is difficult. The first step in fixing a sagging roof is to identify the cause of the sag. If these already exist nail a 2x4 to them directly under the 2x4 plate you nailed down before. In most cases a sagging roof is caused either by a broken rafter or roof decking but in some more severe instances a damaged or sinking foundation can be the underlying cause of the problem.

For most small punctures you can repair your roof simply by forcing sealant into them. Nail a fill strip at the top and bottom of the beam which will bring the trim board to the desired width image 2. Now add collar ties from one side of the rafter to the other. Installing new heavier roofing materials or multiple layers of shingles can cause rooftop sagging even on well built roofs.

This will give some added strength and take care of any cracks in the wood itself.