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.
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.
In this video we provide details on how to install roof shingles over existing shingles.
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.
They usually come in two variants the 3 tab shingles and architectural or dimensional shingles.
The difference in price is actually greater than the difference in the cost of materials between the 3 tab and 30 year architectural shingles.
Having said that it will be nearly impossible to get a good looking quality installation.
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.
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.
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.
We discuss the nesting method which helps minimize an uneven appear.
Use 1 5 or 1 75 inch roofing nails.
Depending on the width of the pipe you may need to tear away a segment or two of the rubber boot.