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Table of ContentsPros And Cons Of A New Roof Vs. OverlayReroofing Vs Roof Replacement: What's Better?Install Asphalt Shingles Over Existing Asphalt Shingles

How To Install Architectural Shingles Over 3 Tab Shingles

About Don VandervortDon Vandervort has developed his knowledge for more than 30 years, as Building Editor for Sunset Books, Senior Editor at Home Publication, author of more than 30 home improvement books, and writer of many magazine posts. He stood for 3 seasons on HGTV's" The Repair," and functioned as MSN's home specialist for a number of years. If conditions are right, new shingles laid over.

old shingles can be just as attractive and resilient as shingles laid on bare sheathing. Installation is easier than for a tear-off task because you can utilize the existing shingles as guides for laying the brand-new ones. However you must make sure to install the shingles correctly so they lie flat. Reroof tasks are often done without replacing flashings. However installing new flashingsincluding.

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unique drip-edge flashings made for reroofingwill make sure a tight seal and a long life. Some roofing professionals set up a layer of water resistant shingle underlayment( WSU )over the existing shingles at the eave end, as would be provided for a roofing system laid on bare sheathing. Asphalt shingles can be laid over cedar shakes or shingles, a job best left to pros. Beveled wood pieces called "horsefeathers" need to be commercial roofing repairs - DC Roofing of Arizona laid along the thick edges of the shakes to make a fairly flat surface. In a reroof task, an unique kind of drip-edge flashing is installed at the eaves and rake to twist around the existing shingles. The rest of the shingles are full-width. The thicker the new shingle, the better.

Two Layers Is Too Many

it will conceal any flaws in the roofing below. It's a good concept to use at least 40-year shingles; architectural shingles are an even much better option. If the existing roofing was set up inadequately and has wavy horizontal lines, you can secure the waves by snapping a horizontal line 1/2 inch below the shingle bottoms of one course.( Shingles, particularly if they are 40-year or architectural types, can span a space of 1/2 inch.) Power nailer or roofing hatchet Tape measure Roofing shovel or flat lever Hammer Drill Carpenter's square Tin snips Energy knife Chalkline Broom Roofing system cement Flashing Nails for flashing WSU sheet Shingles Nails enough time to penetrate sheathing Eliminate the ridge caps. Use a roofing shovel or flat lever to pry out and eliminate the ridge shingles.

Reroofing Over An Existing Shingle Roof: Some Need-to-know Basics

Remove all nails. Eliminate air vents and pipe flashings by prying out or loosening the fasteners holding the component. If you damage shingles while doing this, repair the shingles (see next step). Recycle a vent or flashing only if it resembles new; otherwise replace it with a new one that will fit the hole or pipe. If the damaged piece is lost, cut a piece to fit. The objective is to supply a fairly flat surface area for the brand-new shingles to lie over, with no gaps higher than 1/2 inch. Using a big broom, brush away all broken shingle pieces, twigs, and any other particles that could end up being trapped under the brand-new shingles that you set up. At the eave and the rake, set up U-shape drip-edge flashing produced reroof tasks. Install the eave piece first, then the rake piece over it. The two pieces must meet neatly at the corners. Drive nails at high points on the underlying roofthe bottoms of the shingles. If you have an open valley, set up brand-new W-shape metal or vinyl valley flashing to fit straight over the old flashing. Do not drive nails less than 6 inches from the center of the flashing. Utilize a starter strip or cut pieces for a starter course.

Rip-cut the starter strip or starter pieces so that they butt up against the second course of existing shingles and are even with the leading edge of the existing roofing. Rip-cut the shingles for the first course so they butt up versus the 3rd course of existing shingles and are even with the front edge of the starter course. Their tab slots should not line up with the tab slots of the starter course.

, if there are any. Nail the shingles simply above the tab slots. Snap vertical control lines; there is no requirement to snap horizontal lines. Be sure the brand-new tab slots do not line up with the old ones. When you have actually set up shingles simply past a plumbing vent, install the flashing piece so it.

will rest on top of roof at its bottom but be covered with roofing at its top. Apply roofing cement, slide the flashing over the pipe, and push so it lies flat on the roof. Install air vents in a similar way. For both plumbing-vent flashing and air vents, you'll need to cut the shingle above to walk around the flashing and after that install the shingle. Where you meet a chimney or side wall, set up step flashing. You'll require to pry the siding external to slip in the flashing; sometimes you'll need to eliminate the siding. Safeguard the action flashing with counterflashing. On a chimney use a mill to cut an imprint into the mortar. Cut and flex the counterflashing to fit comfortably into the cut mortar and to cover at least 3 inches of the action flashing. Set up roofing on both sides of a ridge and cut them so they butt carefully together however do not overlap. Cut shingles into ridgecaps. Snap lines on either side and set up the caps. At the rake snap a line directly above the edge of.

Installing New Shingles Over Old Shingles

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the existing shingles. Cut with an utility knife; you might wish to utilize a straightedge. As recommended above, the potential cons of re-roofing tend to surpass the possible pros, but everything depends upon your circumstance. The following list includes some universal factors not to reroof in addition to some factors to consider or things to check out if you're seriously thinking about including brand-new roofing shingles over old ones.