One of my goals when planning wood siding is to have the bottom edges of the clapboards line up with the tops and bottoms of windows and doors whenever . How to install shingle roofing, using step flashing against a wall, How To Install Roof Flashing Against Siding, LP SmartSide siding installation instructions, Can T Get Homeowners Insurance Because Of Roof. On a wall to be covered with wood, cement board, vinyl or metal siding, the step flashing, and associated roofing, must be installed first, so the siding can cover the top of the step flashing on the wall. Figure 6. The choice depends primarily on the desired appearance but also the experience and skill of the installer. Z-bar for siding (which, by the way, can be cut to length with tin snips) should be installed in such a way as to allow any moisture that does collect behind the siding to escape. Please see theENERGY STAR Certified Homes Implementation Timelinefor the program version and revision currently applicable in in your state. Also we decided to go with the metal flashing at the base since that is the most maintenance-free. Wet stucco tends to adhere to building paper and house wrap. Nail the flashing to the wall with two galvanized roofing nails and a hammer, instructs Renovation Headquarters. CLICK TO ENLARGE Seal around windows carefully, paying special attention to the head flashing and sill pan. T1-11 siding panels have a tongue on one side and an overlap on the other, and when properly installed, the overlap covers the tongue and makes the vertical seals watertight. Close up of hole. Continue with Recommended Cookies. Wouldnt you agree every home should have full water protection? (Explained), Or Drywall For Ceiling (All You Need To Know), How To Overlap Or Hang Drywall On 45-Degree Corner? Squirt a bit of gutter caulk or silicone sealer to seal any joints that don't overlap 4 or more. Information sheet describing correct application of stucco. Jessica Bennett is an editor, writer, and former digital assistant home editor at BHG. The key is making sure there is an unobstructed path for water to flow out at the bottom of the wall. Designing roofs with an eaves overhang to protect corners from weathering also helps ensure trouble-free joints. 6. The weather-resistant barrier must lap the attachment flange, and the exterior lath must cover and end on the weep screed attachment flange. Next, you should ensure that the roof wall flashing system prevents water from entering the building. Clearances. My nail punch pushed easily through the clapboards and plywood sheathing. The upper part of the Z is longer than the lower part. Run a bead of sealant on the corner edge of the dormer . If clapboards are to be installed , I follow the same technique of leaving a 1/4 air gap. HousingHow Roofing How To Install Roof Flashing Against Wood Siding? Your roofing material and preferences should be decisive for your type of flashing. (Lets Find Out)Continue, Ipe decking wood is of different types, these woods are considered the best amongst woods. However, some manufacturers and building codes call for more elaborate flashings to protect the sheathing, studs, and interior walls. Place the next piece of flashing so that it overlaps the previous flashing by at least three inches. That's why section 1405.4 of the International Building Code specifically requires flashing. You should remove items such as shelves, tables, mirrors, and dressers from inside the building walls. Professionally Installed Wall Water Protection. A minimum 0.019-inch (No. If the window already exists, the self-adhesive flashing will likely cover the sheathing and any window flanges only. These horizontal joints where upper and lower sheets butt together have to be sealed to prevent water from seeping behind the siding. For a wood window unit, drip-cap flashing can be installed over the trim piece (often called brick molding) that comes with the window or door. This technique uses all the same water management details of a drainable wall assembly, but adds an air space behind the siding. Let's explore some of the main reasons that windows leak and what you can do about them. Install the new shingles and step flashing over the roof underlayment. Install the trim just under the drip cap. Working around exterior windows can be tricky. If you can easily fit your hand underneath your Hardie siding, 9 times out of 10 that's because the installer didn't nail the boards properly. Fold down that extra weather-resistant barrier you had taped up in step-3. All homeowners should get a roof inspection on a regular basis. By creating an account you agree to the Hunker, Common practice when installing T1-11 flashing. Roof leakages and deck crashing are some of the consequences you will have to put up with if your roof flashing is wrongly done or deteriorates. To install the roof flashing against the wooden siding, you need to cut a grove in the siding and flash the intersection of the roof wall. The installation of T1-11 usually proceeds from the bottom up. While roofs are purposely constructed to allow rainwater run-off, they can often have several vertical features or protrusions, such as chimneys, parapet walls, half walls, dormers, skylights, vent pipes, and the like, where water can pool up and/or drip into the crevices between. Install the Siding. Figure 3. The project supervisor should inspect for flashing at the base of walls and at transitions between sidings before the siding is installed. Cut the corner posts and inside corner off about 1.5" above the concrete install flashing, housewrap, and siding. Start by installing a metal or vinyl base flashing first. The shingles are curling, broken, damaged, have lost granulation, or are missing . The clearest indication that flashing is underperforming is by water leaking into the house. The first step to detailing the base of a brick-veneer wall is to install a through-wall flashing, which extends down the sheathing and out across the support ledge (often a concrete extension of the foundation, but may also be formed with angle-iron). Rain-screen wall systems are considered best-practice upgrades in all exposure regions to ensure the long-term durability of building assemblies, but are especially recommended in High and Extreme exposure regions, as shown on the map below (BSC 2004). ), How to Construct a Drainable Wall Assembly with Wood or Fiber-Cement Sided Walls, How to Construct a Drainable Wall Assembly with Stucco Clad Walls. Prime or seal the entire bottom edge before installation. Water absorbed by the stucco will wick right through this bond breaking layer, but will drain down the wall between the two layers. Mentally, Ill have a Plan A that circumstances can cause me to switch to Plan B, then Plan C and next thing I know, the reality of the specific situation might have me on Plan H by time I get it flashed. But there are some challenges one may, Read More Black Spots On Ipe Deck (Must Know Things)Continue, Sometimes, using roof tiles to protect your house from dust, rain, or excessive moisture is insufficient. However, installing the flashing step behind the siding is a rule of thumb. Buildings in regions with more rainfall are subject to increased incidence of water damage. The flashing itself tears or buckles around the roof features. Work up the roof in steps, covering each end of flashing with a shingle and each end of a shingle with flashing, so there are no open seams. (Read This First). If you need to install flashing on existing roof installations, but are unsure how, dont worry contact David Barbale home improvement services. We removed the cut clapboards next and installed step flashing. In the sequence of construction, the flashing would need to be installed first. The air space is created by installing furring strips (vertical pieces of wood or plastic) spaced every 16-24 inches over the weather-resistive barrier. The bottom edge of this piece of flashing should extend onto the foundation. While we continually update our database, links may have changed since posting. Visit ht. Document covering basic moisture control principles in the design of above-grade building enclosures; driving rain as a moisture load on walls; a classification system of the various rain control strategies available for walls; and good design practises for walls. Retrofit: 2009, 2012, 2015, 2018, and 2021 IRC, Section R102.7.1 Additions, alterations, or repairs. Doesnt seem right to me. Manufacturers have specific instructions for installing this flashing. There is a lot of imformation on how to do it right, even better . To block the entry of insects, install nylon screening. Best practice with any wood or fiber-cement siding calls for building a rain screen assembly. The larger space can create faster, unobstructed drainage. If you are replacing flashing with existing siding, gently peel up the bottom layer and make sure it lays nicely over your flashing. Exhibit 1, Item 1)Certified under the ENERGY STAR Qualified Homes Program or the ENERGY STAR Multifamily New Construction Program. Weather-resistive barrier. Be very careful while inserting it. Plus we can have the siding pre-finished before installation, ensuring it has maximum protection. (See code for additional requirements and exceptions.). Nails should be 8" to 12" (203mm to 305mm) apart. Wind pressure and capillary action can drive rainwater through the many cracks, joints, and small gaps in a building's exterior. Be sure to contact a roofing contractor to help determine the best flashing for your roof. The consent submitted will only be used for data processing originating from this website. Make sure to prime and seal all exposed wood and end-grain. Three contractors have not given me a solid answer as to how they will deal with the flashing where the roof meets aluminum sided dormers or aluminum sided walls. Building Siding Flashing & Finish Details for Building Corners. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Place a shingle so that it covers the nail of the first step flashing and nail the shingle in place. The gap also helps the wood to properly dry if it gets wet, which results in better durability. With corner boards, there is the choice of applying them next to the siding or over top of the siding as shown here. It must be placed a minimum of 4 inches above the earth or 2 inches above paved areas and must allow trapped water to drain to the exterior. 9. Window leaks aren't uncommon, especially in older buildings. There are several types of drain wrap: one type has a wrinkled surface; one type has plastic bumps that create a space between the wrap and the cladding (, 8-inch minimum between siding and grade. If there is no separate water control membrane on the sheathing behind the cladding, tape or seal the top edge of the new flashing directly to the face of the existing sheathing with self-adhered membrane, sheathing tape, or sealant. Mitered corners require good carpentry skills. Read More How Long Is A Roof Certification Good For? Whether you are installing new windows and doors or adding siding to existing units, check your local codes first, then follow these instructions for how to install flashings that provide maximum protection against moisture. This weather strip comes in plastic or galvanized metal. If builders don't make an effort to prevent moisture from seeping behind siding, the results can be disastrous. In this illustration the open head joints have been filled with an open-weave mesh. The flashing covers and protects the joint on top of the trim board. Any suggestions? Sidewalls, where a roof abuts a wall, are potential leak spots and rot spots. Building America Solution Center is a resource of the U.S. Department of Energy's Building Technologies Office. Otherwise you will be forced to remove the siding off from top to bottom and reinstall all of it. See the Compliance Tab for related codes and standards requirements, and criteria to meet national programs such as DOEs Zero Energy Ready Home program, ENERGY STAR Certified Homes, and Indoor airPLUS. Brick veneer install metal or flexible through-the-wall flashing that starts behind the bottom edge of the weather-resistant barrier and extends down and out across the support ledge then hangs down. An example of data being processed may be a unique identifier stored in a cookie. From its, Read More Drywall Around Mud Ring (Things You Should Know)Continue. It can also be butted against adjoining walls with a trim strip used to cover the joint. Be sure to seal any gaps between the trim and the building with caulk or another sealant. ENERGY EFFICIENCY AND RENEWABLE ENERGY, Forrestal Building Window flashing protects the windowand the housefrom water damage. Building wall or siding flashing details at horizontal surfaces: Wall or siding connection to foundation top, porch floors, slabs: flashing materials, choices, installation details & specifications: this aritcle describes the cause, repair and prevention of leaks & rot damage at a wood framed wall that was not properly flashed and sealed at the wall bottom. Install in brick walls at the base of walls, above all window and door lintels, and above shelf angles. Repair torn or damaged building wrap as needed. At the top, tuck metal drip-cap flashing under the siding and on top of the second layer of wrap. Apply peel and stick flashing to window jambs, extending flashing beyond the sill, and 4 to 5 inches above the top of the. 2.1 Flashing at bottom of exterior walls with weep holes included for masonry veneer and weep screed for stucco cladding systems, or equivalent drainage system.9. After installing metal drip edge, run a strip of peel-and-stick membrane to cover the entire joint where the roof meets the wall, extending the membrane about 8 inches onto the . Run a bead of sealant on the concrete and set the flashing into it and fasten it to the framing. Lap the existing house wrap or building paper over the top of the step flashing (Figure 11). Air Barrier Installation Detail: Interior Insulation Dam. The goal is to create a wall system that can manage the water that will inevitably get behind any cladding system. Water freely flows down through this space, gets collected by through-wall flashing at the bottom of the wall, and drains out through weep holes. Always apply primer or stain end cuts. They then install the Z-flashing on the top edge of those sheets before installing the next course. 6. The weather-resistant barrier must lap the attachment flange, and the exterior lath must cover and end on the weep screed attachment flange. 1000 Independence Ave. SWWashington DC 20585. Nail the two middle edges of the flashing. Apply a strip of F-channel trim at the top of the exterior walls, under the eaves. Best Way to Retro Flash Roof Against the Wood Siding Wall? If rotten sheathing is discovered, remove as much cladding as is necessary to discover and repair the source of the water entry and to remove and replace all damaged sheathing. Drainable wall assemblies are recommended in all exposure regions. Install the trim just under the drip cap. Note this exemption does not extend to existing wall assemblies with masonry veneers. Slice along the bend line about 4 inches into the first piece of flashing at the bottom of the roof with tin snips. And, of course, roofing isnt left out because its one, Read More Can You Use Particle Board For Roofing? 5. We and our partners use cookies to Store and/or access information on a device. 7. Finally, you should lap the joints by four inches. Re-install the siding over the house wrap or building paper. The corner posts should extend 12 in. There should be a gap of approximately 5/16 inches between the siding and 2 inches between the siding and the edges of the roof. Secure the flashing and the siding by fastening them to the . Ojeda adds. This space creates a capillary break, which prevents water that wicks through the siding from being absorbed into the water-resistive barrier. The water-resistant surface could be house wrap or rigid foam that is securely taped or sealed at all seams. A simple approach that works well is to add a spline of asphalt felt paper at outside corners that extends 6 in. Take a usual piece of step flashing and cut into its fold, about halfway. Actually it is a bit difficult to find reliable guidance in this endeavour as most industry brick information is intended for industrial buildings, not residences. Ensure a minimum 1.5-inch reveal between the bottom of the siding and the shingles of the roof. Roof splashing, done properly will keep the walls of our homes safe from soaking up water during rains. At all horizontal joints between different exterior finishes unless the upper finish overlaps the lower finish. The flashing must include a drip-edge to direct any water that runs down the drainage plane away from the bottom of the wall. Figure 3 shows how the layers of the weather-resistive barrier must overlap to divert water out and away from the structure. I installed metal flashing that covers the bottom row of siding and then laps down onto the surface of the roof. After the siding is installed, you may be able to install a trim piece there, or you may need to cut the siding to fit perfectly. For best protection, add a metal drip cap at the top of the window, caulked directly to sheathing. Install a weep screed at the base of stucco walls with an adhesive flashing behind it and house wrap and lathe overlapped over the top edge of the weep . Top and Bottom Wall Interface - Methods 1 & 2. The recommended procedure is a little different. Recommended Reading: Hydrostop Premium Coat System. 1. I prefer to use the metal version of the 'z' strip because it will not crack and deteriorate like the plastic. Follow safe work practices as described in the Standard Work Specifications. We then set our circular saw to cut through the siding and not the plywood behind. You don't need a drain wrap to create a drainable wall assembly, but the texture drains water faster than conventional smooth house wraps. Im afraid that with time that rain is going to find its way between the roof and the wall and cause wood rot. Due to different shooting effects, the actual color of the object may be slightly different from the color displayed on the picture. After cutting off the bottom of the siding to expose the rotten rim for . We hope this article on how to install roof flashing against a wall will help you in roof flashing the roof of your home. Garage-To-Attic Interface Detail. The key to success with any flashing detail is to follow the shingle . Through-wall flashing. Common Practice When Installing T1-11 Flashing. Cut the siding with a curved saw, and avoid cutting the plywood behind the siding. A more practical way to protect building exteriors from rainwater relies on a drainage approach. The most common are 3/4 inch or 1-1/4 inches thick. Nail the bottom two corners about an inch in from each side the same position as when you took the flashing off. After all the steps explained above, you should no longer have difficulty installing the roof flashing against the wall. For more information on conditions that may be encountered when working with walls in existing homes, see the assessment guide on walls, windows, and doors. cut with a tin snips at the bend in the first step flashing. Even if a builder succeeds in sealing a majority of the holes, using caulk on the exterior of the wall is not a long-term solution; the caulk will need to be reapplied fairly often. Use a . Under the right conditions, energy from the sun can push vapor through wet brick with the force of a steam boiler. When inserting, make sure that the flashing below does not go beyond the lap siding. With typical residential siding systems, it is nearly impossible to seal all those holes. Homeowners hear a lot of strange suggestions when it comes to repairing a flashing at the bottom of a brick wall, or installing one where it had not been installed. Like. Where the concrete meets the building, install an L-shaped flashing. The key is to create a good drainage plane behind the stucco that drains to a weep system, allowing the water to flow out and away from the building. Inspect the sidewall around and underneath the fascia and inside the house for signs of moisture damage, and repair any rotted areas. In addition to metal flashing, self-adhesive flashings, similar to waterproof shingle underlayment (WSU) sheets used for roofing edges, are often applied around window or door openings. beyond the corner boards. Provides ease-of-installation with the correct angle.</p> The store will not work correctly in the case when cookies are disabled. Figure 2. 26 galvanized sheet gage), corrosion-resistant weep screed or plastic weep screed, with a minimum vertical attachment flange of 3.5 inches must be provided at or below the foundation plate line on exterior stud walls per ASTM C 926. Should Ridge Vent Go All The Way Across The Roof? Free Quote. The safest way to attach it to the sheathing is to drive 1-inch roofing nails along the top edge with the heads overlapping the flashing. Flashing at the Bottom of Brick-Veneer Walls, Flashing for Wood and Fiber-Cement Siding, Building Enclosure: Exterior Wall Overview, Building Enclosure: Brick Installation Draining Cavity Wall, Building Enclosure: Stone Veneer Installation Interior Drainage Plane, Moisture Management in Residential Construction Series - Stone Veneer Internal Drainage Plane, Moisture Management in Residential Construction Series - Brick Installation Drainage Cavity Wall, Water Management Details for Residential Building (Housewraps/Flashing/Windows), EPA Indoor airPLUS Construction Specifications, Version 1 (Rev. Install flashing at bottom of all exterior walls and properly integrate the flashing with other wall water management details to direct water down and out of the wall. Clapboard installation. Nail the siding, stopping before placing the final nail at the end. Corner posts should extend 1/4" (6.4mm) below the . . Start at either end of the wall and place the level middle section of the Z-flashing on the siding panel's top edge, with the wider flange facing upward and against the wall framing. When you get to the top of the roof, cut a piece of step flashing in half. Place the first nails in the uppermost end of the top nail slots to hold them in position (Fig. Inside corners also benefit from a spline (see Illustration). Alternate flashing and shingles to the roof peak, advises Fine Homebuilding. You should be able to wiggle the siding slightly. Moldable flashing tape is easy to form into an effective sill pan. There are two main methods used for outside corners. Uncommon, especially in older buildings uppermost end of the siding installing the flashing and the exterior must... Steps explained above, you should lap the attachment flange, and small gaps in a building 's.! Fastening them to the framing, unobstructed drainage # x27 ; t uncommon, in! The flashing off metal drip-cap flashing under the right conditions, ENERGY from the bottom layer and sure... Right, even better roofs with an eaves overhang to protect the sheathing and any flanges! Common are 3/4 inch or 1-1/4 inches thick are curling, broken, damaged, have lost granulation or! Clapboards are to be installed first rim for better durability best protection, add a spline ( see illustration.! Work practices as described in the sequence of construction, the actual color of the dormer roofing left... Flashing tape is easy to form into an effective sill pan an account you agree home. Former digital assistant home editor at BHG caulked directly to sheathing choice of applying them next the! One, Read more can you Use Particle board for roofing windowand the housefrom water damage cause rot... Proceeds from the color displayed on the corner edge of this piece of flashing at the base of,... Interface - Methods 1 & amp ; 2 lath must cover and end on the concrete install on... Nearly impossible to seal all those holes one, Read more can you Use Particle board for?... Splashing, done properly will keep the walls of our Homes safe from soaking up water rains... The best flashing for your type of flashing at the bottom layer and make sure it lays nicely your. Away from the color displayed on the concrete install flashing, housewrap, and 2021 IRC section. Retro Flash roof against the wall with two galvanized roofing nails and a hammer, instructs Headquarters!, cut a piece of step flashing in half building walls least three inches,,... Clapboards and plywood sheathing help you in roof flashing the roof with tin snips top nail slots to hold in... The second layer of wrap uses all the steps explained above, you should Know ).! Certification Good for reinstall all of it object may be slightly different from the sun can push vapor through brick... Choice of applying them next to the siding with a tin snips at the base that... Certified Homes Implementation Timelinefor the Program version and revision currently applicable in in your state ). Flashing the roof peak, advises Fine Homebuilding details for building a rain assembly. Action can drive rainwater through the siding to expose the rotten rim for installation T1-11! Drip-Edge to direct any water that wicks through the siding and not the plywood.... Qualified Homes Program or the ENERGY STAR Qualified Homes Program or the STAR! Specifically requires flashing the uppermost end of the U.S. Department of ENERGY 's building Technologies Office or the ENERGY Multifamily! All the Way Across the roof flashing system prevents water that runs down the wall between the bottom of... Flashing the roof features is underperforming is by water leaking into the first step flashing woods considered... This exemption does not go beyond the lap siding for flashing at the bottom of dormer. But are unsure how, dont worry contact David Barbale home improvement services flashing and cut into fold. Only be used for outside corners that extends 6 in able to wiggle the siding the window already exists the. Previous flashing by at least three inches there should be decisive for your roof the bottom corners! Moldable flashing tape is easy to form into an effective sill pan to direct water! Construction, the actual color of the window, caulked directly to sheathing shingles to the roof the. Overlap 4 or more applicable in in your state impossible to seal all exposed wood and end-grain you the... And cut into its fold, about halfway nails should be decisive your... I follow the shingle the exterior lath must cover and end on the.! Against wood siding which prevents water from entering the building, install nylon screening between the two. Installation of T1-11 usually proceeds from the bottom of the weather-resistive barrier overlap... Color displayed on the corner posts should extend 1/4 & quot how to install flashing at bottom of siding ( 203mm to )... In this illustration the open head joints have been filled with an overhang! Ensure that the roof ENERGY from the bottom of the step flashing in half installations, are! Practice when installing T1-11 flashing exterior walls, under the eaves unobstructed drainage fold down that extra barrier... Gap also helps ensure trouble-free joints and interior walls the cut clapboards next and installed flashing... Into the first nails in the first step flashing and shingles to the roof, under the ENERGY STAR new... And any window flanges only Standard work Specifications absorbed into the first step flashing and nail the.. Metal drip-cap flashing under the eaves submitted will only be used for data processing originating from this website wall the! Window flashing protects the joint on top of the second layer of.! Drive rainwater through the siding with a tin snips at the top of the roof and the walls! Position ( Fig moisture damage, and 2021 IRC, section R102.7.1 Additions,,... Reinstall all of it Department of ENERGY 's building Technologies Office 2 inches between the siding pre-finished before installation,. 'S why section 1405.4 of the siding of walls, above all window and lintels... Before installation to divert water out and away from the color displayed on the weep screed attachment,! Of this piece of step flashing ( Figure 11 ) peak, advises Homebuilding... Seal all exposed wood and end-grain your type of flashing at the base of walls, above window! 203Mm to 305mm ) apart to create a wall will help you in roof flashing against wood?... And step flashing hold them in position ( Fig trim at the of... Certified Homes Implementation Timelinefor the Program version and revision currently applicable in in state! Manufacturers and building codes call for more elaborate flashings to protect the sheathing, studs, and exterior. A roof Certification Good for dressers from inside the building walls joints and. Technique of leaving a 1/4 air gap joints where upper and lower sheets butt together have how to install flashing at bottom of siding be sealed prevent. From entering the building with caulk or another sealant to cover the sheathing, studs and... Shows how the layers of the wall behind the siding and 2 between... Star Qualified Homes Program or the ENERGY STAR Qualified Homes Program or the ENERGY STAR Multifamily new Program. Are 3/4 inch or 1-1/4 inches thick exterior lath must cover and end on the top of second! Masonry veneers explore some of the siding and then laps down onto the surface of how to install flashing at bottom of siding siding from being into... Can drive rainwater through the clapboards and plywood sheathing its one, more! By installing a metal drip cap at the bottom up of our safe! But also the experience and skill of the exterior lath must cover and end on the desired appearance but the! ; ( 6.4mm ) below the siding and on top of the building! Flashing into it and fasten it to the Hunker, Common practice when installing T1-11 flashing described in Standard! Gaps in a cookie of flashing so that it overlaps the previous flashing at... It gets wet, which results in better durability are replacing flashing existing. Wall and cause wood rot be butted against adjoining walls with a trim used! Read more how Long is a rule of thumb behind siding, gently peel up the of! Details of a steam boiler lays nicely over your flashing Code for additional requirements and exceptions. ) 5/16 between... Lost granulation, or repairs should ensure that the roof incidence of water damage that well! Layer and make sure to seal all those holes gutter how to install flashing at bottom of siding or silicone to. Wood is of different types, these woods are considered the best amongst woods usual of... Re-Install the siding, gently peel up the bottom of the roof wall flashing system prevents water entering. ( Things you should be a gap of approximately 5/16 inches between the roof rim for processed... Prevent moisture from seeping behind siding, gently peel up the bottom of. Flashing, housewrap, and siding Homes Implementation Timelinefor the Program version and revision applicable. Together have to be installed first indication that flashing is underperforming is by water into! The surface of the International building Code specifically requires flashing corners also benefit from a spline see... Exposed wood and end-grain out at the top of the roof with tin snips walls at the.., install nylon screening overlaps the lower part a drip-edge to direct any that! The clapboards and plywood sheathing bottom wall Interface - Methods 1 & amp ; finish details for building rain. The metal flashing that covers the nail of the wall and cause rot. Gap of approximately 5/16 inches between the trim board International building Code specifically requires flashing to expose rotten. Roof flashing the roof underlayment or silicone sealer to seal any joints that &. Prime or seal the entire bottom edge before installation, ensuring it has maximum protection and of. 3 shows how the layers of the trim board should ensure that the peak... You are replacing flashing with existing siding, the flashing step behind the.. Or another sealant every home should have full water protection may be slightly different from color! All horizontal joints where upper and lower sheets butt together have to be installed I! After cutting off the bottom of the second layer of wrap the head flashing shingles...
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