New Roof Over Existing Roof

Why installing new shingles over old shingles can be good.

New roof over existing roof.

It is not possible to mix materials nor to install a new layer over slate or wood tiles. When roofing over your existing shingles can be a good idea. The method of installation varies wildly. A layer of old deteriorating shingles can make your new roof look bad.

Many arizona homeowners with shingle roofs do decide to roof over their existing shingles because. How to install a roof over an existing roof determine the feasibility. 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. Shingles that are raised or misshapen make it hard to lay a smooth flat layer of new shingles on top.

The cheapest option would be to leave the old roof in place and place the new rafters over the existing roof. The condition of the existing roof is critical. That s also why building codes commonly limit re roofing to no more than two layers. The most important part of any roof over is to first come to terms with the state of your roof.

Let s start with the good. Use the guide we. If your existing roof is fairly old there s a good chance the shingles are damaged. 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.

We are doing all the work ourselves so tearing off the old roof would be a real problem. Inspect the condition of your current roof. Premade trusses will form the skeleton of your new roof above your old roof. When you should tear off your roof and start from scratch instead.

Use premade roof trusses premade roofing trusses will be easier and take less time than installing a stick built roof. The new roof will be a metal roof. Another reason is curling shingles as you can only install a new layer if the first one is completely flat and level. I have finally confirmed that it s allowed in ontario provided the plan passes the building inspector.

Once your roof is back in tip top condition you can start looking at the various roof over options. Your house will probably be worth less. 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. We do not want to remove the existing roof so we are proposing to build directly over the old roof.