Here's how to do it right the first time:
- Cut step flashing pieces to be 10 in. wide and 2 in.
- Nail flashing to roof deck only. Nail through flashing into shingle, do not extend flashing above top of shingle and nail, or flashing will angle up.
- Cover tops of step flashing with house wrap and siding.
Should flashing be replaced with new roof?
Flashing repairs are expensive, so we recommend replacing all flashings when getting a new roof. Life expectancy of roof flashing is 40 years when installed properly. Repairing flashing costs 4-5x more than it does to replace it during a new roof installation. There is an added cost due to time and labor spent removing that section of the roof.
How to install roof flashing on a shingle roof?
Roof Flashing Techniques
- Step flashing: Step flashing is best for where the roof face meets a wall, for example, where a dormer projects out of the roof. ...
- Counter-flashing: Counter-flashing is often used to flash chimneys. It involves two pieces of flashing. ...
- Plumbing vent boot flashing: Vent flashing is a cylindrical piece of flashing that fits right around the vent. ...
Does flashing go over or under shingle?
Should flashing go over or under shingles? This is true no matter what type of roof-covering material is installed. 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.
How to install step flashing with a shingled roof?
You will start by snipping one of your pieces of step flashing at a forty five degree angle. You will want to place the lower portion of the step flashing against the roof and the other edge goes around the corner edge. Nail the piece of flashing in place and lay some caulk around the edges. Step 2 - Step Flashing. With the corner flashing installed, run the first row of shingles. After your shingles are laid down, begin to lay your step flashing.
How do you install roof flashing under shingles?
2:525:04How to Install Drip Edge and Step Flashing | This Old House - YouTubeYouTubeStart of suggested clipEnd of suggested clipSide down i'm going to place it bring it in so it just touches my flashing. And i'm going to pull itMoreSide down i'm going to place it bring it in so it just touches my flashing. And i'm going to pull it. Down a half an inch. Now i'm going to take another starter again flip it upside. Down.
Should flashing go over or 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.
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 at the bottom of 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 roofing felt go under flashing?
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.
Can roof flashing be installed over 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.
What is the difference between flashing and step flashing?
Step flashing is primarily used against the sides of walls and chimneys. It works by placing a piece of metal (flashing) under every shingle installed right up against the side of a wall to block the water from running down into it. That's why the term “step” is used in step flashing.
Should Step flashing be exposed?
The step flashing should be visible below the siding because siding installers should leave a . 75- to 1.5-inch gap between the siding and the roof below. This gap can get covered over if the home has been roofed over since the siding was installed, thus building up the roof height.
Are shingles supposed to overhang drip edge?
Shingles should be installed over the drip edge a minimum of 3/8” (9 mm) at both the eave edge and the rake edge. If the drip edge extends… out from the rakes and eaves (typically called DL Style or D Type), the shingles may be installed flush with the drip edge.
What flashing goes on bottom of siding?
Base flashing. The wall system begins with flashing at the bottom of the wall, which collects water that drains down the wall and kicks it out at the base. Metal or PVC flashing can be used. It should have a drip edge that hangs below the sill plate, with the bottom edge at least 8 inches above grade (EPA 2015).
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.
How do you seal the bottom of siding?
Here's what you can do to seal off the gap between your siding and foundation:Clean the siding and concrete and brush off the dirt on the gap.Cover the gap with a backer rod.Seal the gap using a caulk gun.Check for smaller gaps and seal those you spot.Leave the sealant to dry.
Does tar paper go over or under drip edge?
If the drip edge is along the eaves of the roof, it goes underneath the felt underlayment. When the drip edge is along the rake edges, it is placed over the felt paper underlayment.
What is the difference between flashing and step flashing?
Step flashing is primarily used against the sides of walls and chimneys. It works by placing a piece of metal (flashing) under every shingle installed right up against the side of a wall to block the water from running down into it. That's why the term “step” is used in step flashing.
How far should shingles overhang drip edge?
½ inch to ¾ inchIdeal Overhang Length Once the drip edge is installed, the shingles should extend ½ inch to ¾ inch past the drip edge. If the shingles are allowed to extend too far, then they can be caught by the wind and damaged. If they do not extend far enough, driving rain can get under them and damage the roof deck.
How do you install kicking flashing on an existing roof?
3:415:32How I Would...Install Kickout Flashings on Asphalt Shingle Roofs - YouTubeYouTubeStart of suggested clipEnd of suggested clipThe kick out flashing should be placed on top of and at the bottom of the starter shingle at the eveMoreThe kick out flashing should be placed on top of and at the bottom of the starter shingle at the eve of the roof.
Who installs flashing on a roof?
Disclaimer: Roof flashing should always be installed by professional roofers, who understand best practices, safety requirements and the building codes and laws in their area. These instructions are only to help homeowners understand what to expect from their roofing professional.
How far above shingles should flashing be?
First, step flashing must be installed before the siding, so that the siding can cover the top of the flashing. If this is a repair job, the siding must also be removed and replaced with the flashing. Second, step flashing needs to extend 8 to 14 inches above the shingles, according to the National Roofing Contractors Association (NRCA).
How long should a flashing be for a 3 tab roof?
Further, your step flashing pieces need to be 10 inches (254 mm) long and at least 2 inches (50 mm) wider than the exposure of the shingle you’re using. For example, 3-tab shingles usually have a 5 5/8-inch (143 mm) exposure. Typically, 10- by 8-inch (253 mm x 203 mm) flashing is chosen. Those 8 inches are more than enough to cover the exposure of typical shingles. The same size can be used to cover the longer exposure on Nordic™ shingles.
What materials are used for flashing on a roof?
However, roofing professionals in North America now prefer other materials: Aluminum: Aluminum flashing is easy for roofing professionals to form and is lightweight.
What type of flashing is used on a roof?
Types of roof flashing. Skylight flashing: While some skylight manufacturers include flashing in their products, sometimes roofing professionals have to create it or purchase it separately. Valley flashing: Open valleys have metal flashing to protect this critical area of the roof.
What is roof flashing?
Roof flashing is a thin material, usually galvanized steel, that professional roofers use to direct water away from critical areas of the roof, where ver the roof plane meets a vertical surface like a wall or a dormer . Flashing is installed to surround roof features, such as vents, chimneys and skylights.
What is continuous flashing on a roof called?
These are the key types of roof flashing you need to understand: Continuous flashing: Continuous flashing is also called “apron flashing” because it acts a lot like an apron.
