New Roof Over Existing Roof

The new roof will be a metal roof.

New roof over existing roof.

If your existing roof is fairly old there s a good chance the shingles are damaged. Inspect the condition of your current roof. 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. 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. The most important part of any roof over is to first come to terms with the state of your roof. Premade trusses will form the skeleton of your new roof above your old roof.

A layer of old deteriorating shingles can make your new roof look bad. I have finally confirmed that it s allowed in ontario provided the plan passes the building inspector. Another reason is curling shingles as you can only install a new layer if the first one is completely flat and level. It is not possible to mix materials nor to install a new layer over slate or wood tiles.

When you should tear off your roof and start from scratch instead. Shingles that are raised or misshapen make it hard to lay a smooth flat layer of new shingles on top. The roof should be in sound. The condition of the existing roof is critical.

When roofing over your existing shingles can be a good idea. The cheapest option would be to leave the old roof in place and place the new rafters over the existing roof. That s also why building codes commonly limit re roofing to no more than two layers. 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.

We are doing all the work ourselves so tearing off the old roof would be a real problem. Why installing new shingles over old shingles can be good. Multiple layers of shingles can make it difficult or impossible for the nails to penetrate. Use premade roof trusses premade roofing trusses will be easier and take less time than installing a stick built roof.

How to install a roof over an existing roof determine the feasibility. The method of installation varies wildly. Once your roof is back in tip top condition you can start looking at the various roof over options. Use the guide we.