They usually come in two variants the 3 tab shingles and architectural or dimensional shingles.
Reroofing architectural shingles at top of roof.
Architectural shingles will typically cost you 50 to 100 more per square to install than the basic 3 tab 25 year shingles.
Depending on the width of the pipe you may need to tear away a segment or two of the rubber boot.
We discuss the nesting method which helps minimize an uneven appear.
If the structure can support the added weight a typical 20 square 2 000 square foot reroof will cost at least 1 000 less than a tear off job.
In this video we provide details on how to install roof shingles over existing shingles.
Use 1 5 or 1 75 inch roofing nails.
Re roofing over architectural shingles infographic asphalt shingles are one of the most popular choices of roofing materials in the highly competitive residential roofing market filled with various options.
Having said that it will be nearly impossible to get a good looking quality installation.
Once you have installed shingles just past a plumbing vent install the flashing piece so it will lie on top of roofing at its bottom but be covered with roofing at its top.
Notice that in re roofing the starter strip is an inch less in width than when installing new shingles over a fresh roof deck shown in our asphalt shingle roofing guide at asphalt shingle starter course installation that s to avoid a raised ridge and to let the new full shingle course lay flat atop the original shingles.
Asphalt shingles are easy to install last anywhere from 10 to 50 years depending on the type and are less expensive than other roofing materials such as slate tile and metal.
The quick answer is yes you can re roof architectural shingles over existing architectural shingles however you must check with the shingle manufacturer as well.
Advantages of reroofing most building codes allow two layers of organic or fiberglass asphalt shingles on roofs with a 4 12 pitch or less and three layers on steeper roofs.