How To Shingle A Roof Over Old Shingles

Some roofers install a layer of waterproof shingle underlayment wsu over the existing shingles at the eave end as would be done for a roof laid on bare sheathing.

How to shingle a roof over old shingles.

So try and install your nails into the old shingle edge or at least an inch below the edge. Use 1 5 or 1 75 inch roofing nails. However installing new flashings including special drip edge flashings made for reroofing will ensure a tight seal and a long life. The roofing crew uses a red ripper roofing demolition tool to pry up cap shingles which are collected in a plastic bin along with old boot flanges and any loose shingle tabs.

To level out an existing asphalt shingle roof rip down reduce the height of two courses of shingles as shown in the drawing below. Adding new roofing over old sometimes called a re roof is possible only with asphalt shingles also called composition shingles. Secure the shingle with nails one inch from each corner. But if the current roof is curling this isn t possible.

You need to tear off the roof and install a new one. You re better off removing the old roof. Current shingles are curling or in bad shape the new shingle roof should lay flat on your old one. Place the top of each starter shingle firmly against the bottom of the shingle immediately above it and even with the eaves then nail it into place.

Leave the old valley flashing in place and install new over it. But before we get started one thing must be clear. You can t do it with wood or slate for example and you should never mix materials such as laying asphalt shingles over cedar shakes. The next shingle should be placed and secured beside the first one.

After the roof is stocked the laborers pry up several layers of cap shingles at a time and toss them into plastic trash bins see figure 1. A metal roof reduces cooling costs during the summer months because it can reflect the sun s rays. Winter heating costs may be reduced thanks to a double layer of insulation. It s the simplest and fastest way to install a metal roof.

How to roof over existing shingles if conditions are right new shingles laid over old shingles can be just as attractive and durable as shingles laid on bare sheathing. The first shingle should be centered over the line that you marked with chalk. Installation is easier than for a tear off job because you can use the existing shingles as guides for laying the new ones. Because asphalt shingles are routinely exposed 5 in rip down the first strip the starter course so that it is 5 in.

The shingle should also hang about a quarter of an inch over the roof edge.