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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. As mentioned, roofs sag because there's too much weight, or load, for the existing structure. Common loads include: snow and ice.
In this way, how do you fix a sagging roof?
Fixing Roof Decking
- Measure the damaged area between your roof rafters or trusses.
- Cut a piece of 1/2 inch plywood that will cover the area.
- Because driving nails up into the sheathing material will make things worse, glue a piece of 1-inch rigid Styrofoam to your piece of plywood.
Secondly, how much does it cost to fix a sagging roof?
Most home owners spend between $300 and $1,100 for a roof repair, or an average of $650 to fix a roof related issue. Going beyond $3,000 is possible, but at that point a replacement roof could be your best bet.
Roof lifting costs depend on the total area being lifted, the existing construction details, the original and required heights, and more. While the average range of costs varies widely ($5 – $20 per square foot) it is far less expensive than traditional construction, expansion, and rebuild options.