Table of Contents
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.
Can you install step flashing on existing roof?
Step flashing is needed whether a contractor installs new roofing or re-roofs over existing shingles. On re-roofs, the sad case is that contractors do not always take the time to retrofit step flashing because it slows them down, adds cost and additional carpentry work to repair or replace siding.
How far do you overlap step flashing?
Place each step flashing piece about ¼ inch short of the bottom edge of the shingle that will overlap it — just enough so that the flashing piece is not visible when the overlapping shingle is in place.
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 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.
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.
Can you replace 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. Typically, flashing is installed using roofing nails and roofing cement.
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.
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 do you seal roof flashing?
As long as the flashing has been installed properly, you can repair a leaking seam using simple roofing cement in most instances. Simply push the seam back down and secure it in place with screws if necessary, and then apply roofing cement around all the edges of the flashing for a watertight seal.
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.
How many 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.
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).
Should there be a gap between drip edge and fascia?
The best installation method is to leave a gap between the drip edge and the fascia board, about the width of a finger. The shingles should also overhang the drip edge 3⁄8 to 1/2 an inch.
Can roofing felt be used as flashing?
Roofing felt: Felt should only really be used alongside another material for flashing as the felt will not offer full waterproof protection and is not as strong or durable as some of the other options listed here. Rubber: Rubber is flammable, so can pose a serious fire risk.
How wide should valley flashing be?
Different codes may require different materials, but IKO recommends, as a minimum, a 28-gauge galvanized metal. If not metal, the material must still be corrosion-resistant and non-staining. Also, at a minimum, valley flashing must be 24 inches (610 mm) wide.
Should flashing go under siding?
In certain instances flashing may need to be installed on the exterior of siding. However, in most instances, step flashing should be installed “behind” siding. It is always recommended to install step flashing behind stucco, Dryvit, wood panel, lap siding, vinyl siding, cedar shingle siding, etc.
Do you need to tape Tyvek seams?
The manufacturer recommends only taping the Tyvek HomeWrap seams.
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.
