Table of Contents
Can you install step flashing without removing shingles?
In order to properly install new flashing, you’ll have to remove the shingles surrounding your old flashing, and then re-lay them after installation. After installation, you’ll then re-lay the shingles you removed, to provide a comprehensive, water-tight solution.
How do you install flashing under existing shingles?
Does step flashing go over or under shingles?
Step 4: Begin the weave. With step flashing, you do a little flashing, then a lot of roofing, then a little more flashing, and so on. Each piece of step flashing laps over the shingle below and under the shingle above. The bottom edge of the flashing should extend just below the nail line.
Should flashing be under shingles?
Flashing should overlap the roof-covering material, but on asphalt shingle roofs, for aesthetic reasons, the part of the headwall flashing that extends down over asphalt shingles is often covered with a course of shingle tabs. Wind-driven rain can enter at these gaps, causing roof leaks.
How far should flashing go under shingles?
Second, step flashing needs to extend 8 to 14 inches above the shingles, according to the National Roofing Contractors Association (NRCA). Also, before you start installing your flashing, you need to look to see if the wall in question has a corner on the roof face, as in the image below.
How do you install flashing under existing siding?
Nail the siding, stopping before placing the final nail at the end. Slide half of the piece of pan flashing, oriented vertically, under the end of the siding. Make sure the bottom of the flashing does not emerge at the bottom of the lap siding. Secure the flashing and the siding by fastening them to the structure.
Does step flashing go behind house wrap?
Wrap roof paper up the wall to backup the step flashing. Five inches up the wall is good for 4-inch step flashing. It should be high enough for visual verification that it was done. Cut the house wrap so that the roof paper can be tucked underneath.
Where should flashing be used on a roof?
Flashing is critical to certain areas of your roof — namely, the places where the roof surface meets a wall (sidewalls and front walls), the low points where two roof slopes meet (called valleys), roof protrusions (bathroom/kitchen vents, skylights) and the roof’s edges (rakes and eaves).
Does flashing go over or under tar paper?
Installing roof drip edge flashing properly The best way is to install the roof drip edge only along the eaves first, then place ice-and-water barrier (in the snowbelt) or felt paper (underlayment) over the drip edge. This lets any water that gets on the roof run down the underlayment and over the drip edge.
How much do you overlap step flashing?
Because the flashing is 2 inches wider than the exposure of the shingles, each step flashing piece will overlap the one on the course below by 2 inches. Nail the flashing to the roof deck only. Do not nail it to the wall.
Does flashing go over or under tiles?
Cover flashings The cover flashing must extend over the tiles by at least 150mm. It must also extend over a complete tile roll or upstand; therefore, if necessary, the flashing may need to be wider to achieve this.
Is step flashing better?
Step flashing offers far better protection from leaks, because even if a single piece of step flashing fails, the water just hits the next lower piece. That flashing directs the water onto the shingle and the water drains down the roof.
How do you seal roof flashing?
Renew flashing seals by chipping out the old mortar and caulking along the edges of the flashing. Use special masonry caulk to seal the joints between the flashing and the chimney. Seal the seam between the cap and step flashing with urethane roofing cement or silicone caulking compound, as shown at right.
How do you attach a gable roof to an existing roof?
Adding a Gable Roof to an Existing Roof To tie into the side of an existing roof, put a new roof truss on the walls of the addition, brace it upright, then snap chalk lines on the shingles to mark the center line of the new roof valleys, where old and new roofs will connect.
Should roof flashing be caulked?
Roof flashings can be made from thin metal, rubber, and a few other materials. It’s okay to use caulk and roofing cement as a last resort to make a temporary leak repair, but don’t allow a roofer to convince you they’ll work for the long term.
How much step flashing do I need?
Step flashing needs to turn up a minimum of three inches up the sidewall. The flashing material should be 4 inches by 7 inches in length when it lies on the roof deck. The 7-inch length ensures a 2-inch headlap on each course. Once complete, the housewrap should overlap the step flashing that’s applied to the wall.
What is the difference between flashing and step flashing?
Step flashing is primarily used against the sides of walls and chimneys. That’s why the term “step” is used in step flashing. You do it step by step by installing a shingle, then a piece of flashing, then another shingle, then a piece of flashing until the wall is completely protected.
Do you tape the bottom of Tyvek?
Yes, the DuPont Tyvek HomeWrap should be overlaid from 6″ to 12″ and should be seamed up with 3″ tape. Also, make sure that the DuPont Tyvek HomeWrap is installed similar to shingles on a roof so that the water will not run behind the bottom layer.
Does flashing go over Tyvek?
Lap Tyvek® WRB over all flashing (e.g. step flashing, wall to roof intersections and through wall flashings).
Can you staple Tyvek?
When staples without caps are used to temporarily fasten DuPont™ Tyvek® WRBs, no more than 4 staples per square yard should be installed. All staples should be sealed with DuPont™ Tyvek® Tape when the DuPont™ Tyvek® WRB is being installed for air barrier and high performance applications.
