Lay Shingles Over Existing Roof

Step 5 lay the trimmed shingles.

Lay shingles over existing roof.

This is the basic sometimes called straight up way of laying shingles. Using a utility knife remove the tabs from the shingles you will be using. Then lay it over the original old first course so that the strip is flush against. If you keep the old shingles on you skip the messy laborious removal step called the tearoff and you ll save some money on the roof job.

For the kind of shingles you purchase there may be a special starter row of shingles or a roll of strip material that you cut to the length of your roof. Because asphalt shingles are routinely exposed 5 in rip down the first strip the starter course so that it is 5 in. Why add new roof shingles over old. If conditions are right new shingles laid over old shingles can be just as attractive and durable as shingles laid on bare sheathing.

So why would you lay new roof shingles over old. Shifting them in this way will join the ends of the first regular row of shingles placed over the starter shingles. Contrary to what might seem like an obvious benefit having multiple layers of shingles does not necessarily make a roof more waterproof and it often creates its own problems. Why installing new shingles over old shingles can be good.

However you ll want to check with your local building department before you make any decisions. Although many metal roof. Yes you can install a metal roof over shingles. When roofing over your existing shingles can be a good idea.

Many arizona homeowners with shingle roofs do decide to roof over their existing shingles because. The first shingle should be centered over the line that you marked with chalk. When you should tear off your roof and start from scratch instead. In this video we provide details on how to install roof shingles over existing shingles.

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. Building officials in some areas will only allow a re roof over one layer of shingles while officials in other places may allow you to place the roof over two layers of shingles. To level out an existing asphalt shingle roof rip down reduce the height of two courses of shingles as shown in the drawing below. However both of these benefits have caveats.

But you must take care to install shingles correctly so they lie flat. The shingle should also hang about a quarter of an inch over the roof edge. Let s start with the good. Installation is easier than for a tear off job because you can use the existing shingles as guides for laying the new ones.