Many roofers recommend using laminated or dimensional shingles for re roofs because they re thicker than standard shingles and often have a staggered edge profile for looks that helps hide any dips or high spots in the old roofing.
Reroofing architectural shingles at top of roof.
Use 1 5 or 1 75 inch roofing nails.
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.
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.
They usually come in two variants the 3 tab shingles and architectural or dimensional shingles.
In this video we provide details on how to install roof shingles over existing shingles.
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.
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.
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.
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.
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.
Having said that it will be nearly impossible to get a good looking quality installation.
We discuss the nesting method which helps minimize an uneven appear.