How To Install Corner Flashing

You may already know that step flashing is a series of aptitude pieces of metallic that span the joint between roof shingles and next walls, preventing water from getting into the walls every bit it runs downward the roof. One slice of flashing is used at every form of roof shingles so that the flashing laps each course below, in the same fashion as the shingles, to make the joint watertight. Aluminum is the most common and affordable flashing material, while copper flashing is typically used on fancier covering projects.

You demand to end water from moving upwards and in–non just downwardly

Installing step flashing correctly is one of the offset things I teach a new member of my coiffure. The first rule of flashing is that water runs downhill. The second rule of flashing is that sometimes rule No. 1 isn't the whole truth, and that water also runs uphill, as when information technology wicks upwardly inside debris or backs up behind ice. For this reason, I like to lap all flashing by at least 2 inches.

Just nailing on one side to let for movement

It'due south important to recall that a edifice always is moving. If yous nail pace flashing to the wall and to the roof, yous're asking for trouble. Most of the time, I like to avoid putting whatsoever extra holes in the roof surface, and then I nail step flashing to the sidewall only, where both the next slice of flashing and the siding will comprehend the boom head. The lesser corner, where you start the course of flashing, is made from ii pieces of bent step flashing lapped over each other and caulked in place.

Corner flashing comes first

Step 1: Make corner flashing from stride flashing. Once you lot've shingled up to the sidewall, cut a slice of stride flashing at a 45º angle from the outside corner to the aptitude seam. Curve it downwardly and back to sit down apartment on the corner. And so sink 2 nails in the wall about the pinnacle, one on each confront.

Footstep 2: Lay a bead of sealant. Where the next slice of flashing will overlap, apply a dewdrop of caulk to seal the corner. This spot is decumbent to leaking considering there is non a full 2 in. of overlap. Use a sealant designed for covering. Not all caulks can withstand the heat and exposure of being on the roof.

Flexible corner flashing

Instead of making your ain bottom-corner flashing from two pieces that must be cutting and caulked together, you can flash the bottom corner with a piece of corrugated aluminum made by amerimax dwelling products (www.amerimax.com). The flashing has a 31/2-in. base of operations (which rests on the roof) and a 2-in. stand (which fits against the wall). it can be twisted or bent to fit any roof pitch and tin can be used for left-hand or right-hand applications. generally bachelor at larger home stores, a single piece sells for less than $3.

The flashing alternates with the shingles

Step iii: Bend the beginning piece along the plumb line. The first piece of footstep flashing needs one bend so that it laps cleanly over the corner flashing installed in the previous pace. Brand certain the caulk joint between these ii pieces is bedded evenly. Then sink 1 nail into the sidewall to hold the pace flashing in place.

Footstep 4: Begin the weave. With stride flashing, you exercise a little flashing, and so a lot of roofing, then a piddling more than flashing, and then on. Each piece of step flashing laps over the shingle below and under the shingle above. The bottom border of the flashing should extend only beneath the nail line. Adhere each piece with a single nail high enough to exist covered by the next class of flashing, the building wrap, and the siding.

The height requires another custom piece

Footstep 5: This roof ends in a height. For the first side, cut the step flashing along the fold line, and bend downward the lower flap. Drive 1 boom to concord information technology in identify.

Step vi: Caulk the height. Once y'all've come up upwards the other side with step flashing and shingles, you're ready to put on the final slice. Employ a vertical bead of caulk as shown.

Step 7: Make the last slice of flashing. This is the blood brother to the one you already put on the peak. Cut along the fold line, bend down the flap, and press the pieces together along the caulk articulation. Sink one smash into the wall to secure the final slice.

Step eight: Once yous're done, one-half of the flashing will be covered by shingles. After the building paper and the siding proceed, almost all of it will be covered, which is ane of the principal reasons flashing has to be installed carefully to begin with.

More about roof flashing:

A Smarter Way to Wink – Removable two-part counterflashing allows access to roof flashings without digging in to the wall.

Kickout Flashing – How to wink troublesome roof-to-wall intersections.

Four Steps to Wink a Dormer – This leak-free approach begins with an bulletproof corner detail.

Vent Flashing Done Right – Back up roof vent boots with  counterflashing and proper shingling to preclude leaks.

Fourth dimension-Tested Approach to Chimney Flashing – Proven methods and durable materials keep out water for decades.

Using a Canvas-Metal Restriction – A professional roofer demonstrates how to make bends for custom flashing.

Photos by: Krysta Doerfler; drawings by: Clark Barre

Source: https://www.finehomebuilding.com/project-guides/roofing/installing-step-flashing

Posted by: sanchezcasim1959.blogspot.com

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