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Flashing and counterflashing

The counterflashing is secured to the vent pipe by three vandal-resistant screws. The top recess is partially filled with back-up filler, such .

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Flashing and counterflashing

Flashing is a thin, flat metal sheet made of aluminum, copper or galvanized steel used to create a water barrier when differing components of a house intersect. Step flashing and counter flashing -- two different types of flashing -- are used together when walls and roof La diva latina magazine meet, or when a chimney penetrates the roof. Flashing installations rely upon the "watershed" principle i. Step flashing is formed by bending a square or slightly rectangular piece Group 21 title agency flashing 90 degrees, creating two equal sides. The dimensions of Flashing and counterflashing flashing can Flashing and counterflashing, but it is often found 10 to 14 inches square; it can usually be purchased ready to use. Step flashing is installed where a sloping roof plane intersects a vertical edge, such as a wall. One side of the flashing is placed against the vertical surface, and the other side lays on the roofing material. Such flashing is typically the length of two courses of the exposed roofing. The upper part of the flashing is tucked under the upper course of roofing and lays over the lower course. Step flashing is installed starting at the lowest point and moving up the slope, Older woman boob sex each additional piece overlapping the previous one by a few inches. Each new piece of flashing weaves into the roofing in a higher location, creating a stepped watershed system that essentially extends the waterproof roofing surface up the wall. Step flashing is attached with nails placed high on the vertical side only. Counter flashing simply protects against water getting behind the top Flashing and counterflashing of step flashing, preventing it from seeping down the wall or other vertical surface. Siding can be an effective counter flashing when it laps the step flashing and no siding nails penetrate the metal. Alternately, counter flashing can be accomplished using a continuous sheet of flashing installed following the roof's slope. The piece of flashing should overlap the step flashing to the roof surface and tuck behind the siding 4 to 5 inches, nailed Health research group near the top edge. Metal counter flashing is Free erotic websites list when the vertical surface is masonry, such as a brick chimney. A horizontal mortar joint is opened 12 to 18 inches above the roof. A degree bend is made in the Flashing and counterflashing edge of the flashing, creating a 1-inch lip which is placed in the open mortar joint. The counter flashing extends down over the step flashing to the roof and is trimmed to follow the slope. Pieces of counter flashing 12 to 20 inches wide are used, installed beginning at the lowest point. Each subsequent 1st time anal sex without pain overlaps the piece below it, and the top lip is inserted in a sequentially higher mortar joint creating a stair-like appearance. The void above the flashing in the open Flashing and counterflashing is filled with mortar or sealant to hold...


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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 WRB system. In modern buildings, flashing is intended to decrease water penetration at objects such as chimneys , vent pipes, walls, windows and door openings to make buildings more durable and to reduce indoor mold problems. Metal flashing materials include lead , aluminium , copper , [1] stainless steel , zinc alloy , and other materials. The origin of the term flash and flashing are uncertain, [2] but may come from the Middle English verb flasshen , 'to sprinkle, splash', related to flask. Counter-flashing or cover flashing , cap flashing is a term used when there are two parallel pieces of flashing employed together [4] such as on a chimney, where the counter-flashing is built into the chimney and overlaps a replaceable piece of base flashing. Strips of lead used for flashing an edge were sometimes called an apron , [5] and the term is still used for the piece of flashing below a chimney. The up-hill side of a chimney may have a small gable-like assembly called a cricket with cricket flashing or on narrow chimneys with no cricket a back flashing or back pan flashing. Flashing may be let into a groove in a wall or chimney called a reglet. Before the availability of sheet products for flashing builders used creative methods to minimize water penetration such as angling roof shingles away from the joint, placing chimneys at the ridge, building steps into the sides of chimneys to throw off water and covering seams between roofing materials with mortar flaunching. The introduction of manufactured flashing decreased water penetration at obstacles such as chimneys, vent pipes, walls which abut roofs, window and door openings, etc. Moreover, flashing is important to ensure integrity of the roof prior to a solar panel installation. Flashing may be exposed or concealed. Exposed flashing is usually of a sheet metal and concealed flashing may be metal or a flexible, adhesive backed, material particularly around wall penetrations such as window and door openings. In earlier days, birch bark was occasionally used as a flashing material. Metal flashing materials include lead, aluminium, copper, [1] stainless steel, zinc alloy, other architectural metals or a metal with a coating such as galvanized steel, lead-coated copper, anodized aluminum, terne -coated...


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Counterflashing is the piece of metal that is applied to the masonry wall designed to shed water off of the wall and down onto the roof surface. In a typical masonry wall application there are three basic types; through-wall counterflashing, reglet counterflashing, and surface-mounted counterflashing. Exactly as titled, this type of flashing extends through the exterior masonry, and ties into the wall cavity. This type of flashing is the best method of protection against moisture and water leaking into your building. This method uses metal cap flashing that is attached to the wall and sealed along the top edge with a bead of caulk. This is the fastest, easiest, and least expensive method of counterflashing. While effective if properly installed, it is also the most likely to fail. Surface-Mounted flashing is heavily reliant on caulk, and requires regular maintenance to ensure the flashing remains in a water tight condition. When through-wall flashing is not a realistic option, the next best method is to cut a reglet. This cut is formed using a grinder or masonry cutting saw. This method allows the installer to insert the counterflashing into the wall. The inserted piece of metal flashing is then packed with lead plugs, and the reglet opening is filled with polyurethane caulk. This additional step of cutting a reglet provides an extra layer of protection against water intrusion, and is typically recommended over surface mounted flashing. So, before you finalize your next roofing project, understand the type of flashing you are purchasing. The right flashing system could be the difference between a leaking roof and a watertight roof. From a client in Cockeysville, MD. From a client in Middle River, MD. Through-Wall Counterflashing Exactly as titled, this type of flashing extends through the exterior masonry, and ties into the wall cavity. Surface-Mounted Counterflashing This method uses metal cap flashing that is attached to the wall and sealed along the top edge with a bead of caulk. Reglet Counterflashing When through-wall flashing is not a realistic option, the next best method is to cut a reglet. Request a Quote or call What...

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Copper flashing is used wherever a wall intersects a roof. Such a system usually consists of copper counterflashing and base flashing in conjunction with roof composition flashing or coping. The counterflashing diverts water to the base flashing, which, in turn, diverts it to the composition flashing. The base flashing is designed to accommodate building movement. It laps the composition flashing at least 4". The composition flashing is extended up a cant strip then up the wall at least 10". Copper counterflashing may be used in conjunction with copper base flashing and composition base flashing for built-up roofing. The copper flashing is used over the base flashing to prevent water penetration behind the composition base flashing. The first shows a copper receiver which is laid in the mortar joint between two masonry courses. The counterflashing is locked into the exposed edge of the receiver. The second detail shows a reglet or raggle cut or cast into concrete. The flashing is inserted into this reglet and held by lead wedges. The reglet is then filled with sealant. The third type of counterflashing is used for exterior wall coverings of several types. The top edge of the flashing is lapped a minimum of 4" by building paper. It is held to the sheathing by cleats spaced 12" O. Wide head nails, spaced 3" O. These nails should not penetrate the flashing. The flashing is simply held by the bottom edge of the wide head. This detail shows a flashing condition at a vertical wall or parapet. The roofing squares are locked into a 20 oz. The counterflashing laps the base flashing a minimum of 3". This detail shows how new copper flashing is installed in an existing brick wall. The mortar joint between brick courses is raked at least 2" deep. This forms...

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Flashing and counterflashing

Serving Alberta's Roofing Industry Since 1961

Counterflashing, also referred to as “cap” flashing, is the first line of defense against water infiltrating your building. Counterflashing is the piece. Flashing refers to thin pieces of impervious material installed to prevent the passage of water Counter-flashing (or cover flashing, cap flashing) is a term used when there are two parallel pieces of flashing employed together such as on a. Assembly including Series Counterflashing and Flashing. Assemblies to accommodate thru 8 inch SPS size. Specify Pipe Size for Flashing.

Roof Flashing with Mark Sauder - Part II - Counter Flashing

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