A Re-Roofing job consists of applying new roofing material over the existing surface. This is less expensive and easier than a "tear-off" job, which requires that the old roofing be stripped off and hauled away.
Count the Layers: The first step in determining whether or not you can re-roof over the existing surface is to check the rake (the sloped edge) of the roof to determine how many roofing layers exist. Remember that drip edge sometimes is applied before re-roofing and may hide evidence of previous layers. Once the number of layers is determined, check local roofing codes for maximum number of roofing layers allowed. The answer depending on the type of roofing materials and the pitch of the roof.
Check for Solid Sheathing: All rotten boards under the old roofing must be replaced. Go into the attic and examine all suspicious spots including voids and separating plywood. Check for rot by poking with a screwdriver. If the rot is limited to a few places, you need only remove the old roofing and replace the boards in those spots. If necessary, build up the roofing above the replacement sheathing with extra layers of shingles to make a flush surface for the new roof.
Shake roofs, shingle roofs that have curled excessively, and old style inter-locking shingles must be torn off.
Begin at the ridge & work your way down (this is especially important for wood shingles so debris does not fall through the open sheathing. Tear-off wood shingles or shakes by sliding a crowbar or pry bar underneath & pulling sharply upward. This loosens several rows at a time.
Save Old Flashing: Remove flashing carefully so it can be used as a template for new flashing. If old shingles & nails are removed with care, the flashing can be reused. In the case of chimney flashing where the upper part may be embedded in mortar, you may be able to bend the flashing carefully out of the way rather than troubling to remove it.
Inspect the Deck: Once you've removed the roofing, inspect all of the sheathing and replace broken or rotten pieces with a materials of the same thickness. On older homes, the sheathing may be 7/8-inch thick. Plywood sheathing is not available in thicknesses greater than 3/4 inch. Use extra layers of felt or roofing materials to make up the difference.
Placing the dumpster close to the house is the easiest way to remove the roofing material. You can slide the roofing material right into the dumpster.
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