How To Install Roof Shingles Over Old Shingles

Watch and see how easy it is.

How to install roof shingles over old shingles.

The felt should be secured every six inches with nails or staples. Do both sides first and then install ridge cap shingles over the top. Use a starter strip or cut pieces for a starter course. Handy home shows you universal shingling techniques that can be applied to any shed.

Shingling a shed and want some tips. The first row of shingles should overhang the drip edge of the roof. Mark 12 inches up on the roof for the first course of shingles then mark every 5 inches all the way up the roof to set your reveal. Because asphalt shingles are routinely exposed 5 in rip down the first strip the starter course so that it is 5 in.

To level out an existing asphalt shingle roof rip down reduce the height of two courses of shingles as shown in the drawing below. All shingle manufacturers honor the warranty whether their products are used for a reroof or a new roof. Many roofers recommend using laminated or dimensional shingles for re roofs because they re thicker than. Step 3 cover the old shingles.

Re roofers have tricks to lay new roof shingles over old so that the same step ups between courses are maintained but if any old shingles are cupped curled or otherwise misshapen those defects will telegraph through to the new layer. Leave the old valley flashing in place and install new over it. To lay out the design for the shingles begin at the bottom of the roof and place a tape measure inch from the edge of the roof to ensure the shingles overhang the drip edge. Each shingle will require around 4 nails underneath the tar line and about half an inch under where the next shingle will overlap.

Do this on both sides of the roof. Around an inch should do. Damaged shingles should be removed to check the decking for problems. Attach with nails along the top edge of the strip.

If the job is done correctly with the new layer of shingles laid flat over the existing shingles the old roof cushions the new one and serves as a secondary barrier should wind or water ever break through the new shingles.