The ideal fix is to remove all the excessive shingles and replace them.
Flat roof sagging repair.
The most important step when fixing dips in a flat roof is to determine the cause of the problem.
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Remedies for a sagging roof there are a number of remedies for traditional rafter style roof frames depending on the problem and its severity.
Installing new heavier roofing materials or multiple layers of shingles can cause rooftop sagging even on well built roofs.
If your roof is sagging under the weight of too many shingles ideally all the shingles should be removed and a new set installed.
Also inspect the metal or plywood gusset plates used where your wood meets on a truss.
If the sagging roof is due to rotting or warping roof decking the repair will be much easier.
Clean the area thoroughly to ensure the primer gets a good bond before priming the area.
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.
Mix the crumb rubber epdm and eps expandable polystyrene beads with the greenslope adhesive using a bucket or bag and pour it out over the area.
This will protect the original porch.
Weakened sheathing rotting joists and sagging insulation are some possible causes.
Fixing sagging flat roof joists you will have to register or login see top or bottom of page before you can post a message or view images.
You will need to remove the shingles and the old decking however which means there will be an exposed hole in the roof.
How to repair a sagging support beam step 1.
Multiple layers of shingles and new roofing material that s heavier than the roof was designed for can cause sagging even in a well constructed roof.
For small ponding areas 3 x3 a 5 gallon kit can be used.
Often the framing can be bolstered and beefed up internally but if the roofing material needs replacement anyway it may be best to tear off the old sheathing and install larger rafters while the roof frame is exposed.
With the old beam uncovered the temporary beam can be placed on the braces you ve made images 1 and 2.
This may be problematic in winter months but allowing the roof to continue to sag can lead to greater problems such as a cave in.
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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.
Determining the problem determine where the sag is in your roof in relation to your attic.
