How To Install Roof Shingles Over Old Shingles

The first row of shingles should overhang the drip edge of the roof.

How to install roof shingles over old shingles.

Install a layer of roofing felt over the roof before you begin installing the new shingles. Step 3 cover the old shingles. The felt should be secured every six inches with nails or staples. Because asphalt shingles are routinely exposed 5 in rip down the first strip the starter course so that it is 5 in.

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. Leave the old valley flashing in place and install new over it. Handy home shows you universal shingling techniques that can be applied to any shed.

Damaged decking will need to be repaired before you can install any new shingles. Shingling a shed and want some tips. 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. 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.

Do this on both sides of the roof. 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. Use a starter strip or cut pieces for a starter course. Do both sides first and then install ridge cap shingles over the top.

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. To level out an existing asphalt shingle roof rip down reduce the height of two courses of shingles as shown in the drawing below. Damaged shingles should be removed to check the decking for problems. Around an inch should do.

Attach with nails along the top edge of the strip.