Reroofing Architectural Shingles At Top Of Roof

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.

Reroofing architectural shingles at top of roof.

Depending on the width of the pipe you may need to tear away a segment or two of the rubber boot. Architectural shingles will typically cost you 50 to 100 more per square to install than the basic 3 tab 25 year shingles. 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. 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.

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. Use 1 5 or 1 75 inch roofing nails. In this video we provide details on how to install roof shingles over existing shingles. Having said that it will be nearly impossible to get a good looking quality installation.

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. The difference in price is actually greater than the difference in the cost of materials between the 3 tab and 30 year architectural shingles. 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.

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.