What are the requirements for step flashing on a roof?
1 The width of the step flashing over the roof deck must be at least inches wide. 2 The height of the step flashing installed against the vertical surface must be at least 2 inches high. 3 For a step flashing application, the pieces of flashing must overlap each other by at least 2 inches. More items...
What size flashing do I need for step flashing?
The width of the step flashing over the roof deck must be at least inches wide. The height of the step flashing installed against the vertical surface must be at least 2 inches high. For a step flashing application, the pieces of flashing must overlap each other by at least 2 inches.
Where do you put flashing on a roof?
Place this on top of the roofing felt in the areas where two valleys of a roof plane join. Vent pipe flashing: A cone-shaped fitting. Install pipe flashing into the shingles to cover pipes. Base flashing: Some roof features, such as chimneys, require different pieces of flashing.
What size flashing do I need for shingles?
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.
How wide should flashing be?
Exposed width should be about 2 inches wide. This step is easier done after the integrated flashing pieces are installed, but shown here for clarity. Figure 8. Step flash asphalt shingles.
What are the minimum dimensions of a roof flashing?
There must be 35 mm minimum clearance between flashing and cladding and 75 mm minimum upstand behind the cladding (total upstand of 110 mm).
How wide should roof valley flashing be?
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.
What is the thickness of roof flashing?
For asphalt shingle roof systems, NRCA recommends valley metal be a minimum of 26 gauge for galvanized, prefinished galvanized, Galvalume or stain- less steel; 0.016 of an inch for copper-coated stainless steel; 0.032 of an inch for aluminum or prefinished aluminum; or 16 ounces for copper or lead-coated copper.
Does 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.
What are the different types of roof flashing?
Some types of roof flashing are counter flashing, chimney flashing, step flashing, headwall flashing (also called apron flashing), valley flashing, and gutter apron flashing.
How wide should an open valley be?
NRCA recommends open valley lining for use with asphalt shingle roof systems be formed from a minimum 18-inch- wide metal and include a center rib or splash diverter no less than 1 inch high.
How wide is valley metal?
DimensionsProduct Length (in.)120 inProduct Width (in.)18 in
Does ice and water Shield go under valley flashing?
(The drip edge will be installed over the ice and water protector and other underlayments at roof rake edges.) You should install ice and water protector before other underlayments, including roof felt. Around roof features like dormers and chimneys, you should place ice and water protector below flashing.
Which is thicker gauge 24 or 26?
Since 24-gauge is the thicker material, it's also the heavier material compared to 26-gauge. A 24-gauge roofing panel weighs approximately 30% more than a 26-gauge panel. Just like with thickness, the weight of each gauge also has a range.
Should I use aluminum or galvanized flashing?
Galvanized Steel Steel is heavier than aluminum, which makes it more resistant to damage from heavy impacts as well. This flashing can last for up to 40 years.
What thickness is 24 gauge?
1/4015 U.S. Code § 206 - Standard gauge for sheet and plate iron and steelNumber of gaugeApproximate thickness in fractions of an inchWeight per square meter in pounds avoirdupois239/32012.11241/4010.76257/3209.42263/1608.0741 more rows
Do you need flashing in roof valleys?
Roof Valley Flashing Materials If you're having new roof valleys installed, either as part of a repair job or as a reroofing job, you'll need to choose a flashing material. IKO recommends you choose a galvanized metal that is, at a minimum, 28-gauge and 24 inches (610 mm) wide.
How far from the centerline of a valley must the flashing extend?
11”For roofs with slopes of 12:12 or greater, valley flashing should extend not less than 8" on each side of the valley centerline. For roof slopes less than 12:12, flashing should extend not less than 11” each side. Valley flashing should be center-crimped, painted, galvanized steel or aluminum.
Does valley flashing go over or under underlayment?
Install an underlayment centered in the roof valley. Then, install a non-corrosive metal valley flashing of 24″ minimum width. Lap successive sheets of metal flashing a minimum of 12-inches and seal laps.
How do you overlap valley flashing?
0:171:38How To Overlap + Fasten Valley Flashing. Corrugated Metal Roofing ...YouTubeStart of suggested clipEnd of suggested clipCut off the sharp corners by removing one inch tabs on each side Valley should be overlapped aMoreCut off the sharp corners by removing one inch tabs on each side Valley should be overlapped a minimum of 12 inches. When overlapping Valley apply silicone one inch from the bottom of the overlap.
What is Roof Flashing?
Take a nice hard, long look at your roof. Roof flashing is a thin material made out of metal that directs water away from certain spots on your roof, such as the walls, chimneys, and roof valleys.
What is the purpose of flashing a roof?
The primary purpose of roof flashing is to close a joint in the exterior wall of your home or other roofing application to prevent water from leaking into the materials that go into building the roof or wall in the first place.
Why Should You Check Your Roof Flashing Regularly?
This could be super helpful to prevent a roof flashing problem even before it ever happens. Also, ensuring that the integr ity of the metal is holding strong is important during your regular roof maintenance check as this will help you rest assured that the Roof Flashing you have put up is doing the job it was installed for in the first place.
How does kickout flashing work?
Kickout flashing is a basic flashing that works by redirecting the moisture and rainwater away from the edge of a roof section and into the gutter. Its main focus is to prevent damage to the sides of the walls in your home.
Why do roofs leak water?
The water can collect in the narrow openings on such spots. The result? Damage to these spots and the water will corrode into the house. To stop water leakage, roof experts will apply roof flashing and divert the rainwater down the sides of the vertical protrusions. So, no water stagnation means no damage!
Why do you need flashing on a roof?
Roof flashing is crucial to ensure that the water doesn’t get under your shingles. The parts of the exterior wall and roofs prone to corrosion and water leakage could do with roof flashing. Flashing simply collects the rainwater and redirects it to some other location, say, the drainage. This is what a Flashing does, no matter where it is installed – it protects the crucial areas of your roof.
What metals are good for flashing a roof?
Steel, copper, and aluminium are popular choices. For one, they are malleable. So, they can be framed into any shape. They are also rust-resistant to obstruct water from entering your home and damaging your property. Let’s look more into these metals and why they make for great roof flashing materials.
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 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.
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 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.
What causes a roof to leak?
Damaged or improperly installed roof flashing, especially around the chimney, roof cricket or dormer, is one of the most common causes of roof leaks. According to the Federal Emergency Management Agency, FEMA, improper roof flashing could lead to wood rot and even deck collapse.
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. Use roof flashing wherever the roof plane meets a vertical surface like a wall or a dormer. Additionally, install flashing to surround roof features, such as vents, chimneys, and skylights.
What is vent pipe flashing?
Vent pipe flashing: A cone-shaped fitting. Install pipe flashing into the shingles to cover pipes.
What is a kick out flashing?
Kick-out flashing: Used to bridge the gap between where step flashing ends and the gutter begins. Kick-out flashing directs water away from the wall and into the gutter.
What is continuous flashing?
Installing one long piece of continuous flashing provides protection to the joint between a vertical wall and a sloped roof.
Do skylights need to be flashed?
Skylights: Often skylights have a built-in flashing to protect water from seeping in, but sometimes roofing professionals must create it or purchase it separately. First fit continuous flashing along the base of the window, then step flashing up the sides, and last saddle flashing would be installed at the top of the window.