How To Repair A Sagging Flat Roof

Liquid fillers a variety of liquid patching materials are appropriate for fixing low spots on flat roofs.

How to repair a sagging flat roof.

Using a utility knife make a shallow cut until you can remove material around the spot without damaging the layers underneath it. 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. Now add collar ties from one side of the rafter to the other. Sometimes doing that is difficult.

If these already exist nail a 2x4 to them directly under the 2x4 plate you nailed down before. Attach the trim piece to wrap the beam image 3. 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. Cut around the damaged area until the membrane rests flat.

Cut a 45 degree angle so the edges will be properly mitered for a clean look. Nail a fill strip at the top and bottom of the beam which will bring the trim board to the desired width image 2. You will need to get up into your attic and examine the roof carefully in order to discover the underlying cause. This will give some added strength and take care of any cracks in the wood itself.

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. You can also use a general epoxy concrete filler and apply mastic on top using a trowel. Determining the problem determine where the sag is in your roof in relation to your attic. The first step in fixing a sagging roof is to identify the cause of the sag.

Each side of the iron should be four inches wide with the entire piece being at least two feet long. For most small punctures you can repair your roof simply by forcing sealant into them. Roof patch putty can be applied using a trowel to fill low areas. The ideal fix is to remove all the excessive shingles and replace them.

Installing new heavier roofing materials or multiple layers of shingles can cause rooftop sagging even on well built roofs.