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Table of Contents3 Things To Know About Shingle RoofingDon't Put New Roof Sheathing Over OldCan I Install A New Roof Over My Existing Shingles?

How To Install Architectural Shingles Over 3 Tab Shingles

About Don VandervortDon Vandervort has actually established his knowledge for more than thirty years, as Structure Editor for Sundown Books, Senior Citizen Editor in your home Magazine, author of more than 30 house enhancement books, and author of numerous magazine posts. He appeared for 3 seasons on HGTV's" The Fix," and worked as MSN's home expert for a number of years. If conditions are right, brand-new shingles laid over.

old shingles can be just as appealing and durable as shingles laid on bare sheathing. Installation is easier than for a tear-off job because you can use 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 jobs are sometimes done without replacing flashings. However setting up brand-new flashingsincluding.

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

Two Layers Is Too Many

it will hide any flaws in the roofing below. It's a good concept to use a minimum of 40-year shingles; architectural shingles are an even better option. If the existing roofing system was set up improperly and has wavy horizontal lines, you can get the waves by snapping a horizontal line 1/2 inch listed below the shingle bottoms of one course.( Shingles, particularly if they are 40-year or architectural types, can cover a space of 1/2 inch.) Power nailer or roof hatchet Measuring tape Roof shovel or flat crowbar Hammer Drill Carpenter's square Tin snips Utility knife Chalkline Broom Roofing cement Flashing Nails for flashing WSU sheet Shingles Nails enough time to penetrate sheathing Get rid of the ridge caps. Use a roofing shovel or flat pry bar to pry out and eliminate the ridge shingles.

Layers Of Shingles Allowed On A Roof

Get rid of all nails. Get rid of air vents and pipe flashings by spying out or loosening the fasteners holding the fixture. If you damage shingles while doing this, fix the shingles (see next step). Reuse a vent or flashing just if it is like brand-new; otherwise replace it with a new one that will fit the hole or pipe. If the broken piece is lost, cut a piece to fit. The objective is to supply a reasonably flat surface for the brand-new shingles to lie over, with no gaps greater than 1/2 inch. Utilizing a large broom, brush away all damaged shingle pieces, twigs, and any other debris that could end up being caught under the new shingles that you set up. At the eave and the rake, install U-shape drip-edge flashing produced reroof tasks. Install the eave piece first, then the rake piece over it. The 2 pieces ought to satisfy nicely at the corners. Drive nails at peaks 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 directly 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 versus the second course of existing shingles and are even with the leading edge of the existing roof. Rip-cut the shingles for the first course so they butt up against the third course of existing shingles and are even with the front edge of the starter course. Their tab slots need to not associate 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 need to snap horizontal lines. Make sure the brand-new tab slots do not line up with the old ones. As soon as you have actually installed shingles just past a pipes vent, install the flashing piece so it.

will rest on top of roof at its bottom however be covered with roofing at its top. Apply roof cement, slide the flashing over the pipeline, and push so it lies flat on the roof. Set up air vents in a comparable 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 set up the shingle. Where you fulfill a chimney or side wall, set up action flashing. You'll require to pry the siding outside to slip in the flashing; in some cases you'll need to get rid of the siding. Safeguard the step 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 step flashing. Install roof 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 install the caps. At the rake snap a line directly above the edge of.

Pros And Cons Of Adding A Second Layer Of Shingles

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the existing shingles. Cut with an energy knife; you might desire to use a straightedge. As recommended above, the possible cons of re-roofing tend to outweigh the prospective pros, however it all depends on your situation. The following list consists of some universal factors not to reroof along with some factors to consider or things to have a look at if you're seriously considering including brand-new roofing shingles over old ones.