New Roof Over Existing Roof

The cheapest option would be to leave the old roof in place and place the new rafters over the existing roof.

New roof over existing roof.

It is not possible to mix materials nor to install a new layer over slate or wood tiles. That s also why building codes commonly limit re roofing to no more than two layers. Installing a new roof over an existing one can only be done if you have shingles because you can only put shingles over shingles. A layer of old deteriorating shingles can make your new roof look bad.

You can save money because there s no dump fee for removing your old roofing and there s no need for additional felt paper over the old roof. Once your roof is back in tip top condition you can start looking at the various roof over options. The roof should be in sound. We are doing all the work ourselves so tearing off the old roof would be a real problem.

Many arizona homeowners with shingle roofs do decide to roof over their existing shingles because. Why installing new shingles over old shingles can be good. Inspect the condition of your current roof. Shingles that are raised or misshapen make it hard to lay a smooth flat layer of new shingles on top.

When roofing over your existing shingles can be a good idea. The most important part of any roof over is to first come to terms with the state of your roof. Another reason is curling shingles as you can only install a new layer if the first one is completely flat and level. We do not want to remove the existing roof so we are proposing to build directly over the old roof.

What you need power nailer or roofing hatchet tape measure roofing shovel or flat pry bar hammer drill carpenter s square straight cut tin snips utility knife chalkline broom. Use the guide we. 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. I have finally confirmed that it s allowed in ontario provided the plan passes the building inspector.

The condition of the existing roof is critical. Let s start with the good. The method of installation varies wildly. If your existing roof is fairly old there s a good chance the shingles are damaged.

Your house will probably be worth less. The new roof will be a metal roof. Use premade roof trusses premade roofing trusses will be easier and take less time than installing a stick built roof. Multiple layers of shingles can make it difficult or impossible for the nails to penetrate.