HEADWALL FLASHING A headwall is a level junction where a roof meets a wall. This illustration shows proper flashing at a headwall condition. Headwall flashing should extend up behind the exterior wall covering and down over the roof-covering material, as you see here.
What is base flashing?
base flashing. [′bās ‚flash·iŋ] (building construction) The flashing provided by upturned edges of a watertight membrane on a roof. Any metal or composition flashing at the joint between a roofing surface and a vertical surface, such as a wall or parapet. Click to see full answer.
What is head wall flashing?
Water damage from splashback is common in wall areas located:
- under the eaves of a roof with little overhang and no gutters
- where an attached backyard deck meets the house
- above a lower roof where it abuts the wall
What is a building flashing?
[ edit] Types of flashing
- Roof flashing: Installed around projections or intersections to direct water from seams or joints .
- Wall flashing: Typically embedded in wall interruptions such as windows, either to prevent water ingress or direct water that has entered back outside.
- Sill flashing: Concealed under windows or door thresholds to prevent water ingress .
What is a valley flashing?
Valley flashing: Open valleys have metal flashing to protect this critical area of the roof. Drip edges: The edge of the roof has thin metal flashing that helps water drip off the roof without damaging the home or causing a leak.
What is headwall flashing on a roof?
HEADWALL FLASHING A headwall is a level junction where a roof meets a wall. This illustration shows proper flashing at a headwall condition. Headwall flashing should extend up behind the exterior wall covering and down over the roof-covering material, as you see here.
What can I use to flash a headwall?
1:085:24THE BEST WAY TO INSTALL THE BEAUTY ROW OF SHINGLESYouTubeStart of suggested clipEnd of suggested clipThe headwall flashing. It is depleting that unsightly unsightly metal flashing especially on theMoreThe headwall flashing. It is depleting that unsightly unsightly metal flashing especially on the front elevation of the home.
What are the different types of flashing?
Common Types of Flashing:Continuous flashing: Also known as “apron flashing”. ... Drip edges: Often installed under the roofing felt along the eaves of a roof. ... Step flashing: Step flashing is a rectangular piece of flashing bent 90 degrees in the center. ... Valley flashing: A W-shaped piece of metal flashing.More items...•Jul 30, 2020
What is chimney flashing?
Chimney flashing is a type of roof flashing that creates a waterproof seal to protect your chimney and roof from water damage and penetration.Sep 15, 2020
How do I flash my porch roof to my house?
0:004:34How to Install Roof Flashing - YouTubeYouTubeStart of suggested clipEnd of suggested clipTake the metal bend it and stick it in there and then seal that so that the water has one smoothMoreTake the metal bend it and stick it in there and then seal that so that the water has one smooth surface to just kind of go down the face of it off the front out onto the roof.
Should you nail flashing on a roof?
2:053:34How to Install Flashing on a Roof | Mastering the Roof by GAF - YouTubeYouTubeStart of suggested clipEnd of suggested clipThe step flashing to the roof with 2 nails. Don't nail through the flashing to the wall because theMoreThe step flashing to the roof with 2 nails. Don't nail through the flashing to the wall because the flashing needs to be able to move with any deck and building movement.
What type of flashing is best?
Aluminum: While some materials are stronger and others cost less, aluminum remains the most popular choice of flashing among most homeowners. Aluminum makes a good balance for flashing material if you are on a budget but still want quality.Apr 23, 2018
What is structural flashing?
Flashing refers to thin pieces of impervious material installed to prevent the passage of water into a structure from a joint or as part of a weather resistant barrier system.
What is flashing in civil?
Metal roof flashings are made up of metal strips, mostly folded in either ZINCALUME® or COLORBOND® steel and are attached to both the roof and the walls. Its primary purpose is to prevent rainwater running down your roof from entering your home and falling to the ground.
Do all chimneys need flashing?
For chimneys wider than 30″, there should be a saddle flashing installed. Saddle flashing creates a peak that allows water and snow to run off and prevents it from building up on your roof and chimney.
Does chimney flashing need to be replaced?
Your roof flashing needs to be checked annually. Remember, you won't always have to replace your roof flashing when you get a roof replacement. No matter what kind of metal it's made of, your flashing should outlive the original roof it was installed on.Jul 31, 2020
Do all chimneys have flashing?
A: In most cases, chimneys are fairly small and the masonry extends down through the roof to the firebox and eventually to the foundation. It is true that through-wall flashing is rarely used in these chimneys.
Where should flashing extend?
Except where walls are brick, the vertical part of the sidewall flashing should extend up behind the exterior wall covering, just like with headwalls . The horizontal part of the flashing will vary, depending on the type of roof-covering material.
How big is a step flashing?
Step flashing size requirements vary according to manufacturer. Manufacturers' requirements can vary anywhere from 2 inches to 10 inches, and you probably won’t be able to see the sidewall flashing completely, anyway. The vertical side will be hidden behind the exterior wall-covering material.
What is the standard size of flanges for a roof?
Common flange sizes are 4 inches by 5 inches . Headwall flashing typically comes bent to 120° and can be fairly easily flattened for roofs with shallower pitches. Occasionally, you’ll see a roof which has had 90°-sidewall flashing installed as headwall flashing.
How much gap between roof and sidewall?
Sidewall Gap. In both headwall and sidewall conditions, unless the exterior wall is brick, you should see a gap of at least 1½ inches between the bottom of the exterior wall-covering material and the top of the roof-covering material. You’ll often see exterior wall coverings installed right down on top of the shingles.
What is mastering roof inspection?
The purpose of the series “Mastering Roof Inspections” is to teach home inspectors, as well as insurance and roofing professionals, how to recognize proper and improper conditions while inspecting steep-slope, residential roofs. This series covers roof framing, roofing materials, the attic, ...
Do you need flashing on a roof?
Headwall flashing should extend up behind the exterior wall covering and down over the roof-covering material, as you see here. 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 ...
Can you put a wall covering on top of shingles?
You’ll often see exterior wall coverings installed right down on top of the shingles. Without a gap, the exterior wall covering can wick up moisture from the roof. This can lead to decay, delamination, peeling paint, and other problems. This condition is especially common on roofs with multiple layers of shingles.
What is Roof Flashing?
A roof system requires flashings to weatherproof any area where a penetration occurs. This includes rakes and eaves, pipe vents, walls, skylights, chimneys, and valleys. Flashings are the most important component of a roof. If the flashing is not installed with great attention to detail, leaks will occur.
Counter and Chimney Flashing
We install counter flashing on brick/masonry walls above the roof surface to cover the top of other flashing, such as step flashing. This directs the flow of water away to prevent leaks. Flashings should always overlap so water does not run behind the top of the flashing and get into the building.
Step Flashing
We install step flashing against walls and other penetrations on a roof to prevent leaks. This flashing sheds water to the course below it so it does not need solder or sealant. For this reason, we fabricate step flashing from a pre-painted metal to prevent corrosion.
Headwall or Apron Flashing
We install headwall flashing, also called apron flashing, where vertical walls intersect the roof. It prevents leaks by guiding water running down the wall onto the roof system. We place headwall flashing behind siding. If your house has a brick headwall, we install counter flashing to overlap the top of the headwall flashing.
Valley Flashing
We install valley flashing at angle changes in a roof system. There are many approved methods for valley installation. We find that the open no-cut valley method works the best. This method gets its name from the NRCA Roofing Manual: Steep-slope Roof Systems.
Gutter Apron Flashing
We install gutter apron flashing along the gutter line, which is where the roof and gutter meet. At this intersection there is a gap that is formed from the fascia trim board and roof sheathing. This flashing has a drip edge, which is a lip on the metal that keeps water from draining onto other building components.
When should I repair my roof flashing?
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.
What is metal flashing?
Metal flashings on buildings serve a multiple of similar yet slightly different functions. to direct water that has penetrated behind the cladding back out to the exterior (such as wall base flashing), or. to protect an interface between two different enclosure elements (such as roof to wall step flashing), or. ...
Where are flashings needed?
Flashings are needed wherever a drainage plane is terminated as at a roof edge or bottom of wall, or interrupted as at openings, intersection of assemblies, control joints, or penetrations of the drainage plane. Flashings must not direct water onto another building element in a way that concentrates moisture loading.
What is the driving force behind drainage?
Gravity is the driving force behind drainage. The “down” direction harnesses the force of gravity and the “out” direction gets the water away from the building enclosure assemblies, openings, components and materials. In general, the sooner water is directed out the better. Sooner, may not always be practical—such as at window openings ...
Can you drain a window into a drainage space behind a cladding?
Sooner, may not always be practical—such as at window openings where draining a window into a drainage space behind a cladding is often more practical than draining them to the exterior face of the cladding. The most elegant expression of this concept is a flashing (see Roof to Wall Flashing with Foam Sheathing ).
Should head flashings rest on the flashing?
The cladding above the head flashing should never rest on the flashing as this leads to problems with the flashing being bent in the wrong direction and sloped back towards the building. Head flashings should extent laterally past the opening on either side.
Do flashings have to be down and out?
Where flashings need to be site-built from sheet metal, or flashing membranes, the finished installation must follow the fundamental flashing rules of down and out. Flashings must always direct water out over the cladding or drainage plane without openings that would allow water to be directed back into the wall.
