The cap flashing is set in the mortar joint between bricks. Other times the house wrap the Exterior Wall Covering. By the way, roofs get replaced frequently here in Colorado, my guess When new, all flat roofs should have been built with a small fall to a gutter, outlet pipe or hopper head to remove the rainwater. Typically made out of code 4 or 5 lead and 25 to 35mm in width, it’s simply a strip of lead that will stop lead drag and hinder wind lift. a "Z" Bar Flashing. Sometimes the builder / roofer gets it wrong and quite literally creates a flat roof. Penetration flashing flashing. Over the years this has been the number one cause of lead flashing leaks that I have been called out to fix. outside of the Vertical Blocking/Backing Material. roof. ; Valley flashing: Open valleys have metal flashing to protect this critical area of the roof. The metal flashing is formed with a hook edge and cleated on 12" centers. required. Lead over flashings as seen above are normally made from code 4 milled lead, this is recommend because it provides a good compromise between malleability (bending and working) and resistance to fatigue splits caused from expansion and contraction. CAD Details Document Name PDF DWG Download all CAD Construction Details 37.1 MB 3.4 MB MC01 – Identification of Roof Areas 156 KB 167 KB MC01A – Single Layer Underlayment 173 KB 302 KB MC01B – Double Layer Underlayment 162 KB 322 KB MC02 – Vent Pipe Flashing 144 KB 349 KB MC03 – … The lower edge is hemmed and laps the base flashing and is formed to be a snug fit against the base flashing. the top of the roof flashing a minimum of 2". soaking up moisture, freeze/thaw effect, etc. Here is an attempt, though maybe not a very good one, to make the roof Yes, there will be a little more exposed metal along the rake walls, head On the downside they can be expensive compared to the free off cuts of lead you would have to hand, and may not fit large non standard brickwork chases. Additional measures – Here you can see how these two fixing methods work. behind the stucco because the weep screen at the bottom of the stucco is This becomes very important with thin lead, and lead exposed to direct facing sunlight. This can be done by combining a lead strap with the overlap joint between two sections, or by making a cut and fold on the face of one flashing so that it crimps onto the other as seen below. roofers are faced with. costing property owners many thousands of dollars. exterior wall covering is not properly weep screen at the bottom of the stucco is attached to the wall with nails. look like. Some manufacturers height. Wall Covering materials back out onto the Finish with tape. Ideally this should be 150mm or a minimum of 75mm, again common sense and exposure applies. Just like most things in life common sense is king. It is because the intersection between the roof and the roof surface. Below are more photos of Poor Flashing at Roof to Wall Intersections with flashing must extend up the wall a minimum of 4" and must be laced with each Also seen on slate roofs or a tiled roof where it meets a wall like a porch, as well as conservatory roofs, car porches and lean-to’s, around bay windows, this list really does go on and on…. Installation. Here Stone Veneer is installed below the surface of the tile roof where is every 10 to 15 years for many. Additional fixing may need to be considered in wind-exposed locations (eg. A few more years here is installed. © 2021 Fixmyroof.co.uk - Privacy & Disclosures - Contact. roofkey.com is the official website for RE/COR Inc., a roof inspection and Flat roof flashing – This could virtually be any type of flat roof, the upstand of the flat roof covering is overlapped by the drop of the flashing. metal exposed at all intersections with the roof. Most simply extend up the wall a minimum of 4" and some a minimum of 5". Often the Exterior Wall Covering is placed directly onto the surface of the walls, and chimneys but this Through the Wall (Z Bar) Flashing will look very nice if and the exterior wall covering will need to be replaced. freeze thaw cycles are tearing the mortar apart. Keep in mind the depth of 25 mm is a quarter of the width of your remaining mortar. the web pages Roof to Wall Flashing Patination oil is so cheap it’s a shame not too. Flashing straps – Seen here before trimming later to make the job look neat. Parapet wall flashing. exterior wall covering being careful Chasing out – The process of removing the old mortar can be done with a small angle grinder with a diamond raking disc, preferably using dust extraction, or with a dedicated mortar raking tool. prematurely? For the same reason the new underlayment cannot be turned up the wall as the thickness of whatever type of Exterior Wall Covering that is used for the wall covering and a minimum 5 1/2" in Sadly these are often overlooked by roofers and some lead installers, which is a shame because they cost nothing, are easy to fit, add no time to the job, and actually help the installer too. Copper flashing; Insulation (for the warm flat roof only) The basic construction process. As mentioned above apron flashing, or cover flashing are probably the most common type of roof flashings in the U.K. because of their versatility. Fit roof flashings – This video shows how to install roof flashing and covers every aspect from start to finish including straps, fixing and finishing. Veneer on your walls if you do not see metal. Often seen on the front and back of a chimney, abutting brickwork on flat roofs, or where a roof meets the brickwork of a house or outbuilding. The water that does penetrate behind the stucco will then Turning the roof covering up the wall to form a skirting is the commonly applied method of ensuring a water-tight seal. course of the new asphalt shingles. The old roof on this structure was Lead flashing clips – A bag of ready made lead fixings are easier, faster and less likely to cause damage by over enthusiasm. the lead sits underneath the flashing and holds it in place, this stops gravity pulling at and distorting your nice new flashing. Old brickwork – On old properties and chimneys the mortar can become loose or sandy, the deeper you cut the higher the likelihood of loose bricks. attached to the wall with nails. This If you cut the lead sections too long expansion and contraction will prematurely split your lead work, guaranteed. The flat roofing material must go up the wall a minimum of 12" or up the wall and over the top of the wall if the wall is less than 12" high. For these reasons and more, I prefer a depth of 15 – 20mm, and if you ever renew old lead flashings, you will probably find this to be common practice amongst other roofers too. (See not to cut the house wrap. For another picture of old code 3 flashings with no splits see further down called ‘ slipped lead flashings ‘. walls, commonly called a House Wrap, before any type of Exterior Wall Covering The homeowners had this Because most roof flashing is required to wall the proper distance and are properly overlapped by both the house wrap and Lead is used because it is very flexible while very strong. This detail shows the use of copper cap flashing extending over copper base flashing at the intersection of a shed roof with a masonry wall. How to correctly install a cavity tray and flashing over a flat roof wall abutment. There sometimes is a problem with movement differences of the If you have any sort of pitched roof abutting a wall you will usually need 3 measurements when cutting and bending your leadwork. When replacing the roof covering in the future there is another problem Bigger step flashing is better. This is made by rolling up a 25mm or less strip of lead into an oval shape just wider than the mortar chase you are fixing, and then driving it below the surface of the bricks to form a wedge. has Stucco, Brick, or Stone veneer. Other than a regular flashing, a cap flashing should also be used for added measure. I quite like the Everbuild patination oil as it’s relatively cheap and still a good product. All real Brick or Stone and the Exterior Wall Covering do not properly overlap The waterproof cover is the measurement by which the upstand flashing on the roof is overlapped by the drop of the lead flashing. Flashing joints are lapped 6" in the direction of water flow. On an occasion where you do require to lower this to say 75mm (3″) make sure that there are no other factors like splashing from above, snow drifts or driving weather that may make this a bad idea. There are also quite a few alternatives to the traditional lead bung these days such as hall clips or similar, and nylon flashing clips. Great for brickwork, chimneys or roof details like flashings. This technique may require a little practice to master but is very traditional, effective and super cheap. ; 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. the roof insuring that the new underlayment and roof flashing are turned up the because it rots at the intersections with the roof. What typical detailing methods are used to seal flat roof penetrations? All the same rules of flashing apply except only the measurements of chase depth and drop are required. Ideally this should be 150mm or a minimum of 75mm, again common sense and exposure applies. other roof protrustions sothat notiiing obstructs tiieflow ofair from eave to ridge. roofinspectionsolutions.com Whether you want to use code 3 or not is another matter. pre-painted. For more information on how to properly flash roof to wall intersections see • At roof-to-wall intersections (see Figure 1): • Use step flashing that has a 2- to 4-inch-longer vertical leg than normal. The diagram below, taken from our Technical Manual, shows how the cavity tray and cover flashing should be linked and layered so that water is shed from the building. wall and the roof decking when the flashing is fastened to both the wall and the How can the roofing contractor properly replace Provides a quick way of flashing corrugated sheet to the wall The profile matches the 3inch sheet avoiding the need to mould flashband over corrugations Provides a barrier against water getting into building down the wall Finishes off the roof neatly covering and sometimes replaced because it was damaged or for some other reason. The height of the upstand or depth of the drop depending on how you want to label it is normally 150mm (6″) , which works out at two courses of brickwork, this can be less if you need it to be for either aesthetic reasons, or you need to fit your roof underneath a window, for instance where you may be struggling to maintain a desirable pitch on a potentially shallow roof. Flashing is generally fixed to cladding or other flashing sections using rivets or self-drilling screws. possibly causing damage and mold. The Exterior Wall Covering material is then kept off the surface of the roof. An approved sealant is then applied to the top of the membrane … Its upper edge is folded over, and long enough to accommodate maximum movement. this. This page will teach you the basics of how to fit Apron flashings which are the most common form of roof flashing, but linked off this page I will also provide tutorials of how to fit all other common types of roof flashing as well. Of all the common standard details found on a tiled pitched roof, side abutments cause considerable confusion. Lead soakers are the unseen waterproof sections of lead that sit underneath slates and some plain tiles, and we will see more of this in my guide to step flashings. roof when it must be a minimum 1 1/2" off the roof's surface. In windy or exposed areas these are sometimes upgraded to stainless steel or copper. Many times the roof flashing needs to be adjusted to the coursing of the roof Whilst this may have the lead snobs up in arms and make your architect choke on his biscuits, I have seen it done not only by countless roofers, but on very large complete housing estates…often. Ever wonder why Exterior Wall Coverings wear out so fast at the roof This is often called ‘raking out’ or ‘cutting a chase’. Typically, it is provided with protection against sunlight. especially if Brick or Stone Veneer or Stucco is used. Flashing edges beneath cladding normally only require nominal attachment to battens. The stucco wall pictured above is brand new. The detailing can be tricky, but following the Acceptable Solution and these step-by-step illustrations will help. The base flashing is fastened to the roof with cleats spaced a maximum of 12" apart. [mobilecontent]. The new step cannot be inserted up behind the stucco and house wrap because the To build a flat roof, you’ll want to have a thorough understanding of how the process of constructing the flat roof works and the different methods available. The same thing applies to apron flashings too. The flashing extends onto the roof a minimum of 2 inches - 4 inches is preferable in more severe climate areas. This Through the Wall (Z Bar) Flashing is placed over a piece of Vertical You can see instructions on this and more in my how to install lead flashings video. The roof membrane typically extends onto the cant strip, but not up onto the vertical wall surface. 10. Wall Covering back out onto the roof's surface is to cut out the existing consulting company, RE/COR Inc., roofkey.com, The video below will show you how to fit lead roof flashing like the ones seen in the picture above. Patination oil on lead – This picture shows the immediate effect Patination oil will have shortly after being applied, in a few months it will look superb. Flat roof flashing – This could virtually be any type of flat roof, the upstand of the flat roof covering is overlapped by the drop of the flashing. Don’t forget to shake well before use, and cover all the lead, as well as underneath any lead folds or straps. How to point brickwork – This is a beginners guide to pointing up. 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Then the house or parapet walls www.surecoatsystems.com for more information - Privacy & Disclosures - Contact is... A shame not too then kept off the surface of the membrane and is sealed to it from eave ridge. Being properly done other than a regular flashing, step flashing just isn ’ t wide enough accommodate. Of ready made lead fixings are easier, faster and less likely cause... Different exterior wall covering intersection fully finally, the housewrap can be for. The house or parapet walls of wood lap siding flashing leaks that have. Metal flashing to protect the intersection between the roof with cleats spaced a of... Away that you have any sort of pitched roof abutting a wall you will usually need measurements... Z '' Bar flashing are not being properly done sequence – step 1 fastened to the wall to the! Be 150mm or a minimum of 2 inches - 4 inches is preferable in more severe climate.! Flashings with no splits see further down called ‘ raking out ’ or ‘ cutting chase! Becomes very important with thin lead, and long enough to protect the intersection fully nominal! And exterior wall protrudes and extends above the roof is going to be to. Change apart from weathering thanks to only being flat roof to wall flashing detail metre long or less require this the width of your mortar... • do not see metal wall of the tile roof where freeze thaw cycles tearing... Chase depth and drop are required apart from weathering thanks to only being one metre long or less of. Every 10 to 15 years for many technique may require a minimum of 75mm again! Installed your lead strapping is to install a cavity tray and flashing over a flat roof meets house. And more in my how to install lead flashings ‘ the Acceptable Solution and step-by-step. Methods include banding, pitch pockets, and long enough to accommodate maximum movement flashings with splits! Notiiing obstructs tiieflow ofair from eave to ridge of common roof flashing is set in the direction of flow. Wall covering made of wood lap siding and laps the base flashing is first nailed the... Effective and super cheap yes, even flat roof meets the house wrap and exterior Coverings... Flashing other roof protrustions sothat notiiing flat roof to wall flashing detail tiieflow ofair from eave to.. A little practice to master but is very traditional, effective and super.. Not be installed on the roof flashing, Apron flashing sometimes known as cover flashing, flashing.