Old Shingle Roof

That s also why building codes commonly limit re roofing to no more than two layers.

Old shingle roof.

To remove the old shingles expect to spend between 1 467 and 4 890 or from 125 and 500 per roofing square. Ask this old house general contractor tom silva reveals the best ways to secure shingles to a roof. Hammer down any large nails that are exposed by the removal. Do this on both sides of the roof.

A wood shingle roof should be inspected annually and any split shingles should be promptly replaced. Installation is easier than for a tear off job because you can use the existing shingles as guides for laying the new ones. Installing new roof shingles over old effectively doubles the weight of the roofing so you have to make sure your roof structure can handle the extra load. Mark 12 inches up on the roof for the first course of shingles then mark every 5 inches all the way up the roof to set your reveal.

Roof shingles consist of a series of individual overlapping components that when laid together in rows or courses starting at the bottom edge of a roof form a barrier designed to repel water snow and ice. Start from the top of the roof and remove the old shingles along with the flashing underlayment and vents. Costs are adjusted based on the difficulty of removing and disposing of the existing type of roofing material. Installing a metal roof over shingles can also result in an increased chance of trapped water vapor and moisture between the new roof and old roof resulting in new mold and rot.

See below for a shopping list tools and steps subscr. By removing the old roof before the new roof s installation you are able to give the underlayment a thorough inspection to ensure there are no damages that could cause leaks or other issues with your new roof. Inspect the underlying roof sheathing for damage and make any needed repairs. Roof shingles are installed in such a fashion that each seam or joint is overlapped by a shingle further up the roof.

If conditions are right new shingles laid over old shingles can be just as attractive and durable as shingles laid on bare sheathing. To lay out the design for the shingles begin at the bottom of the roof and place a tape measure inch from the edge of the roof to ensure the shingles overhang the drip edge. But you must take care to install shingles correctly so they lie flat. The cost of materials alone range from 3 240 to 10 800 depending on the size of your roof.