Shingle Over Shingle Roofing

When contemplating a new roof many people hope to simply do a shingle over and avoid the extra cost and mess of tearing off the existing roof and starting from scratch.

Shingle over shingle roofing. How to shingle over existing shingles and how to shingle a roof how to install roof shingles shingle layout lines h. Roofing second layer of shingles roofing. Shingle a roof over existing shingles save 75 give or take. Overlaying asphalt shingles with a metal roof is a big no no.

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. To shingle on top of existing shingles there are a few things you want to make sure. 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. The first shingle should be centered over the line that you marked with chalk.

A metal roof should always be applied after the old shingles are torn off completely and new synthetic felt paper is applied. Many pros shingle in a vertical line up the roof because it s much faster. Secure the shingle with nails one inch from each corner. In fact the only pro to a shingle over is it s cheaper and cleaner.

Continue this until the first row of shingles is complete. Although it sounds like a good idea we can assure you the cons heavily outweigh the pros. 1st and foremost your existing roof needs to be in reasonable shape. All shingle manufacturers honor the warranty whether their products are used for a reroof or a new roof.

That s also why building codes commonly limit re roofing to no more than two layers. Their representatives said absolutely not to overlaying shingles with a metal roof. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros. I got this directly from the 1 metal manufacturer in the us.

Before you reshingle a roof read our step by step guide for adding new shingles over old ones. Known in the trade as vertical racking or staggering this how to lay shingles method enables the roofer to install a single column of shingles all the way to the peak without the wasted back and forth motion necessary to fill several rows of stair steps. No missing shingles no gaps no holes in the roof no soft spots because of water damage.