CT1 is perfect and will give a premium result in the pitch of the roof in sealing slates and. Apply roof cement to any gaps or cracks. Suitable for sealing lead flashing into brick, stone or concrete, as well as joints on gutters, downpipes, venting and overlaps in rigid sheet roofing. Apply sealant to the inside-top corners of the rough opening (at the header) Then install the window andWakaflex® Universal Flashing Westlake RoyalTM Roofing Components’ Wakaflex® Flashing is the best choice for chimney flashings, skylight flashings, pipe flashings, side wall flashings, head wall flashings, roof-to-wall flashing, step flashing, solar flashing, flashing roof vents, and many other flashing applications. Now I'm just thinking that I get some good masonarh paint and. Lead flashing wedged into joint below If you need your chimney flashing replaced, a professional will: · Remove existing flashing, as well as the surrounding shingles. The will allow the overlapping flashing or counter flashing to slide into the slot. The lead flashing around a chimney is designed to protect the overall roof structure while keeping the rain out and protecting it from other elements. It will hold water out and help seal around screw holes and metal fasteners to prevent corrosion. The CT1 sealant is only perfect for sealing lead flashing because of a single reason. , 2 in. No-one had proposed a sleeve (if I understand it - take off a few tiles around the crack, cut the lead and add a piece under/over, then replace tiles). Through-Wall Flashing. Peel & Seal Instant Waterproof Repairs 6-in x 25-ft Aluminum Roll Flashing. The window flashing tape should only be used if the site is completely dry first. £0. A unique self-adhesive instant waterproof repair and flashing material. The following table shows the. Paintable after 24 hours. If your roof has a skylight or multiple skylights, they will definitely need flashing around the edges to prevent water from leaking down into your skylights. This type of sealant is a relatively new entrant into the sealant world. make sure the chase is free from dust and dirt before using lead sealant. The flashing is ideal for both seam sealing and flashing. Use a regular paintbrush to apply the sealer to the brick. Repeat—shingle, step flashing, shingle, step flashing—all the way up both sides of the dormer. . Large Size Plumbing Vent Repair for 4 in. The lot code for Loctite PL Roof & Flashing Polyurethane Sealant follows this format: HE9038R302, where 9 represents the last digit of the year of manufacture, and 038 signifies the day of manufacture based on 365 days per year. Wakaflex is Australia's leading lead free roofing flashing tape. EST. and down and across the roof joint (probably with about 8" overlap on the roof). Lead flashing has been used for centuries to seal gaps around doors, windows and at wall abutments. The cost to repair a leaking chimney depends on what’s causing the leak. Position and Nail the Second Step Flashing Piece. 56. Press it firmly into place, nailing it off in several places high up the wall. Screwfix Select. . Lead is one of the oldest roof flashing materials. Nationwide Delivery. 2. ) b) weld a patch over the crack. This is a quick-and-dirty fix for a window that sti. In order to do so safely, you will need an extension ladder and rubber. If you have to replace shingles around a skylight, examine the old flashing. 48. Next comes the counterflashing: A second layer of metal is embedded in the chimney mortar joints and folded down to cover the top of the step flashing. Moldable flashing tape is easy to form into an effective sill pan. A super reinforced aluminum surface and rubberized asphalt adhesive that will instantly repair gutters and flashings, metal and flat roofs, RVs and mobile homes, trucks and trailers, skylights and. Proper flashing of a skylight is critical. Caravans - for sealing leaking panels. Weight Price; 0 - 249kg: £2. doitall, Aug 22, 2004. We've got a velux window that is leaking in the bottom corner. Using the circular saw and masonry blade cut a slot about 1. 3M™ Venture Tape™ Selfwound PVC Tape 1510R. Wood: Not all chimneys have a wood structure where the chimney meets the roof, but some do. Allow to dry. Weathermate ™ Flexible Flashing is a self-adhering, fully adhered flashing that conforms to curved surfaces to provide a tear-resistant seal that combats water intrusion around windows, doors and other penetrations. Today’s roofs cost a lot and last a long time—30 years to 50 years—so you need a boot that’s up for the. The first, bending two pieces and caulking the joint (Photos 1 – 3), is the most common because you can do it on the spot with the flashing at hand. I think it probably needs clearing out and re-seal along. Better boot flashings cost between $11 to $60 and may be well worth the expense. looking at the picture it doesnt appear to be sealed correctly around the step so water could be getting in there. CT1 has a formidable adhesion and will bond to almost all roofing materials. Amazinglt a pin prick hole allowed gallons of water through enough to fill hi. 98 (63)Adisolve solvent cleaner is the ideal product to clean & remove oil, grease, tar, bitumen & many other stubborn deposits. Step Flashing. In this guide, we will walk you through the step-by-step process of assessing the condition of your existing flashing, gathering the necessary tools and materials, preparing the chimney and roof surface, applying the flashing sealant, securing the flashing in place, and inspecting the seal. Sealed Roof Deck Option #3 For asphalt, metal, mineral surfaced, slate and slate-3. Put one nail in the bottom edge with a dab of caulk under it to seal the hole. Flashing tape is often referred to as lead flashing tape but is mainly constructed of aluminium foil and bitumen rubber adhesive. Type "B" installations. BEST OVERALL: LR Liquid Rubber Waterproof Sealant – Multi-Surface. This flashing method is considered the most satisfactory method of preventing leaks except in areas exposed to earthquakes. Lead flashing is the thin pieces of material that prevents water from accessing the joint. Roof flashing helps to provide a seal wherever there is a roof joint or penetration (like a chimney or vent), where there is an intersection of two roof surfaces, or where the roof meets an exterior wall. Climbing a ladder and walking on the roof should only be done in shoes. Again, fasten only to the roof with a nail through the flashing and the shingle. Where staining of building components from runoff is a potential problem, lead-coated copper may be used, which has a less noticeable gray runoff. The undoubted best way to seal lead flashing installation is to find an adhesive sealant with a commendable track record that. b) Choose the sill pan flash option that’s recommended by your manufacturer. Wait until the sealant becomes hard before you proceed to the next step. Lead Slates are used where a pipe penetrates a roof covering to ensure the joints are fully watertight. Mitigating ice buildup: $50 $120. Add to Cart. To prevent unwanted removal, these metric screws have a tamper-resistant Torx drive— also known as a pin-in Torx drive— that makes them difficult to unscrew without special tools. Run water over the low side of the penetration for several minutes while the helper watches for any water droplets. Flashing causes 90% of all leaks on a FLAT roof. Cavity tray/dpc 25mm min. These step flashings are the most common roof flashings after the standard plumbing vent flashing. We will discuss recommended sealants in more detail later in the article. To seal your roof flashing you first have to get on the roof. Our costs are ballpark averages – get a local tradesperson to quote now. A unique self-adhesive instant waterproof repair and flashing material. Wherever sealant is used that comes into contact with copper a rubber or synthetic-base sealant that is compatible with. Now seal the slot with a caulking gun after the flashing is installed. Remember that all chimney flashings need to be masked off prior to applying the sealer. But the crack is due to the expansion/contraction of the lead, and so the lead will most likely continue to move and crack. 13 Flat / Low, Medium and High Profile Tile 19 3. A unique self-adhesive instant waterproof repair and flashing material. If you are going to paint on a temporary repair, use a product called Acropyl, this has glass fibre. Product Details. Roof leak repair costs $500 to $1,200 on average to seal the leak and replace shingles. MasonryDefender Chimney Flashing Sealer – Waterproof Coating for Chimney Flashings. The best way to seal lead flashing installation. Peel & Seal Instant Waterproof Repairs 6-in x 25-ft Aluminum Roll Flashing. Model # TSF925. This adjustable pipe flashing can accommodate 1-1/4 in. Use a liquid sealant to Repair Flat Roof Flashing Leaks DIY. You have to start from the bottom and spray the sealant on the bricks evenly. Excellent low and high (+150°C) temperature resistance. Cut the patch larger than the hole, affix it with. The sealant is perfect for use with aluminum, galvanized steel, wood, copper, vinyl, asphalt, concrete and brick. This lead flashing shows minimal oxidation after 25 years in a coastal climate. Read more. The horizontal part of the flashing will vary, depending on the type of roof-covering material. Flashing protects these areas by acting both as a barrier and as a way to direct water down and off your roof. Labor. The average cost to repair your existing chimney flashing without scaffolding is around £250. Next comes another layer of building wrap, installed like the first layer. Cured sealant may be carefully cut away with a sharp-edged tool. Step FlashingFlashings and copings are fabricated from cold rolled copper in weights ranging between 16 and 20 ounces per square foot. ALSAN FLASHING utilizes either Polyfleece or ALSAN Pre-Cut Fleece that, in combination with its unique chemistry, provides an extremely durable and easy to apply flashing. The sealant of choice to seal lead flashing appears to be silicone sealant but why does this sealant fail? CT1 sealant is a unique hybrid formula that can be applied on wet surfaces even underwater. Even tiny cracks around screws and can lead to wood rot. Adiseal can take 24 to 48 hours to fully cure but seals instantly. dia. Trex Protect can waterproof the tops of the deck joists, rim joists, beams, and the ledger board. The undoubted best way to seal lead flashing installation is to find an adhesive sealant with a commendable track record that will protect it from extreme weather and fluctuating temperatures. It’s also BAL rated 19, which means it’s a great choice for use in bushfire zones. 4. Reece stock a range of flashings including roof flashings, lead flashings and non lead flashings designed for fast and easy installation. Table N1102. 238. A step-by-step guide on how to apply Flashband - the market leading, self-adhesive flashing tape from Bostik. Ensure your job is weatherproof with the perfect flashings at Reece. butyl (rubber) silicone. Lift the vent enough to spread caulk under the sides (but not the bottom edge), then nail with three 1-1/4-in. Where lead flashings are to be installed under dpcs and cavity trays in masonry walls, should the. The chimney sealant is a flat rate that gets included with your labor cost. Calder Lead Roofing Expansion Joint - 3m x 400mm. The required weight depends on the application and is outlined in the discussion related to each detail. polyurethane. The price varies based on your flashing material, chimney size and type, roof. Cut the flashing to fit along the chimney's front. lead flashing has a max length of 1. To seal your roof flashing you first have to get on the roof. The key to success with any flashing detail is to follow the shingle. Before the introduction of lead flashing, which now forms most major applications, a number of methods were employed. THIS SATURDAY (23RD NOVEMBER) OUR SHOWROOM AND TRADE COUNTER WIL BE CLOSED. Heavy white stains might form when an acid-curing silicon sealant is applied during installation. Repairing Chimney Flashing leak in 5 minutes. Leaking conservatory roof - I think the sealant had perished along the join. 98. At the top, tuck metal drip-cap flashing under the siding and on top of. 1. USA . Whether it’s for a new build or an emergency repair, using Bostik Flashband makes the job. Best thing to use is 3in1 oil and parafin mixture, about 1ltr to a small can. These Butyl Rubber Self Adhesive Flashing Tapes are self-adhesive tapes which are relatively odour free & ideal for the following uses: Heating, ventilation, and air conditioning (HVAC) systems - sealing leaking pipes and chambers. diameter. Screwfix customers rate this product 4. 41 – $ 10. Roofing sealant. It will ensure that the damage is sealed, repaired and completely watertight. CT1 sealant is a unique hybrid formula that can be applied on wet surfaces even underwater. Carefully slip in the siding. Our lead sealer paint is second to none for repairing and sealing cracks, holes, leaking seams and age-related damage. 36 inc VAT Each. The third type of counterflashing is used for exterior wall coverings of several types. Secondly, cut a piece of fiberglass mesh large enough to cover the rusted flashing parts and ensure it extends beyond it a little on all sides. Vents) (121) $ 41. Normally, lead flashings should not exceed 1. Exterior sealants. How to repair a chimney leak. There to preserve the part of the chimney where it meets the tiles, flashing is a crucial part of your chimney’s design. 4 mm (0. Forgiving initial tack to allow for repositioning. Flashing is a thin material used to prevent water penetration by providing a seal at joints exposed to the weather. "plaster" (lead seal) repairs are useless against the power of expansion. #3. 00051131569508. 12 Tile Installation 17 3. Prime overall with one full coat of Bulls Eye® 1-2-3 Primer Sealer in accordance with the manufacturer’s instructions. This lead mastic bonds lead to concrete/brick/stonework and possesses excellent elasticity on high movement joints. Install new step and kick-out flashing where an existing roof meets an existing wall as part of a roof replacement. Allow a minimum drying time of 1 hour in normal drying. If you want to help support Shannon to produce more videos like this, visit from. From lead work installations to lead work. Ideal for sealing and pointing lead flashing and overlaps in rigid sheet roofing. ImplicationsThis video shows how to install a metal chimney system through a metal roof with a curb flashing. There are only a few reasons why CT1 sealant is the perfect lead flashing sealant. . See photo attached. . However, as with all materials, lead flashing can become worn and damaged over time, eventually exposing your roof space to unwanted moisture. Fast Flash can be used with almost any roofing materials including: Metal roofs. 67 per kg. Lead is one of the oldest roof flashing materials. Pitch. 9. Scope of work: sealing the perforation on a metal roof. Weathermate ™ Flexible Flashing. Step 1 - Safely Get on the Roof To seal your roof flashing you first have to get on the roof. Ask a question. PART 1 - GEN. It is also. CT1 can affix lead to brick or any other base. Cartridge. Excellent adhesion to metals. Flat cement tiles are used with these plastic dry verge things on the end against the pebble dash and some lead flashing of the most crude has been cut into the wall, lead mastic? to hold in place. Lead Flashing Rolls. Oatey® Roof Flashings can be used in commercial and residential applications where a water. Closed valley approach with the trimmed shingle edges on both sides of the valley. Find Lead vent pipe flashing at Lowe's today. . Figures 2 and 3 show the proper locations to apply sealant, tape flashing, and metal flashing around a pipe that extends through an exterior wall. Accidents and careless painters can lead to scratches on your windows. Step 2: Proceed to place your new. Use your hammer to tap any loose pieces. Apply with a rag, messy but good, comes up that nice blue colour. to 3 in. 3M™ Deck and Joist Flashing Tape 8047. Double-lap flashing – used on slate or plane-tiled roofs with a pitch of more than 30 degrees; Chimney flashing; Apron flashing; Flashing comes in several materials: lead, zinc and bitumen (used on felted roofs). . Priming. Metric Sealing Stainless SteelTamper-Resistant Button Head Torx Screws. 16 May 2009. . Then, grind out a straight chase into the brickwork mortar joint and carefully push the lead all the way in. See More + Heavy bodied trowel grade formulation designed to repair wet surfaces. When constructing homes, take steps to minimize food, water, harborage, and entry for pests. Things like weather, sun, and time can make your roof weaker, causing leaks or damage. Single-component, high performance, wet or dry surface sealant. A sealant that can be used with lead flashing and rigid sheet roofing to ensure it stays watertight and leak-proof. Next, install flexible flashing tape in a half moon below the pipe, overlapping the housewrap. Shape the lead flashing. Product Details. g. It should also cover up the nails holding down the shingle. #bargecapping #metalroofing #colorbond #zincalumeOur roof plumber Darren shows you how to install a barge capping flashing on a gable roof. Counter flashing is bent down and installed in the mortar joints of your chimney. Item# DE90-10. More often a complete waste of time. The first is called step flashing: Sections of L-shaped sheet metal are woven into the shingle courses and lapped up the side of the chimney. Sealant skins within 24 hours, is functional within 3 days and reaches full cure in about 1 week. Installing roof flashing? This is how to properly install a top wall flashing on a polycarbonate roof. BEST FOR RV ROOFS. Window flashing protects the window—and the house—from water damage. Southeastern Metals Valley Roll AL EC Flashing, 10" x 10', Aluminum 17275. - re-felt. Flashing should be tucked into a mortar joint 25mm deep and at least 75mm above the tiling level and lead wedged into place. Lead Flashing Uses on buildings, properties, uses. Lead is soft and highly malleable, making it easy to bend and mold to the roof. £2. Apron and stepped flashing to chimney. Install flashing at the bottom edge of the exterior above-grade wall and overlap with weather-resistant barrier. Agree with the ever cheerful Deleted member 11267 above, it's a bodge, rip it out and get a good roofer or old school plumber to chase the mortar out of a lower course of bricks, then insert a lead flashing, dressed around the corner properly and neatly. If the metal gutter parts have rusted through, you can quickly and eas. Priming. Push it into the joint and up the wall so that the rubber firmly adheres to the surface beneath. 08 Head and Apron Flashing 12 3. Applying patination oil for lead Provided you’ve followed our storage advice and your lead flashing has been installed professionally, it’s. There are three main types of valley flashing approaches: Open valley flashing approach that makes use of sheet metal flashing and is by far the most preferred and reliable type. Patch repair existing flashing (with scaffolding) £550. Reinstall the roof shingles on top of the flashing. We also stock: Chimney Cowls; Roof Nails, Screws & Fixings; Roof Tilesvia Titan’s Roofing. This in turn c. It remains in the top ten defects identified by the Queensland Building and Construction Commission (QBCC) building inspectors. 3M Stock. Repairing chimney flashing can cost between £. 09 Standard Curb Mounted Skylights, Chimneys, Etc. Flashing causes 90% of all leaks on a FLAT roof. Buy top wall flashing to save time; One of the hardest areas to seal on a corrugated lean-to roof is where the corrugated roof meets the back wall, where there’s no flat surface for lead flashing to seal on to. As you roof along a chimney, alternate shingles and L-shaped pieces of step-flashing. Hi. For larger holes use Yellow Jacket imbedded in Wet/Dry Roof Repair. In these cases: • the top surface of the lead flashing must be painted with a good quality exterior paint system (to limit contamination with lead compounds in water running off the. Oatey 12976 Flashing Roof Aluminum - 1. Adhesive is, at best, a bodge. When it comes to less intrusive stains, cleaning lead flashing with vinegar is the way to go. Compare. Special Order. Step 7. water tight seal. Step 1 - Safely Get on the Roof. Joints at the roof, around vent pipes, to have lead, copper or galvanized steel flashings or approved elastomeric material. -wide strips of a self-sticking waterproof underlayment. 5070 10. com. Seal the cap flashing by caulking along the mortar joint with polyurethane caulk. Excellent adhesion to metals. 9 x 3 Air Brick Buff. The first is called step flashing: Sections of L-shaped sheet metal are woven into the shingle courses and lapped up the side of the chimney. Counterflashing will cover the tops of the step-flashing. All opinions or methods expressed in the video(s) are personal opinion only and for educational purposes only. Taking care not to get your sealant all over everything, slide the boot down the pipe to the metal panel. Roof shingle repair costs $100 to $300 to fix missing shingles or $350 to $1,000 to replace shingles in a 10'x10' area. Add to basket. 5m in length, with laps of not less than 100mm. A water-based primer should be used to enhance the bond with the EPS foam. . Model # 0316-GA. Replacing flashings is a common repair, although it’s more expensive than replacing slates. 3M™ Indoor Window Insulator Kit, 2 Windows. Smooth it on with your hands from the flashing edge and towards the wall to prevent trapped air. Specifically developed for the industry by Calder on behalf of the Lead Sheet Association. or method 2. Choose the safe, durable and easy to install roof flashing on a roll for tool-free installation. A super reinforced aluminum surface and rubberized asphalt adhesive that will instantly repair gutters and flashings, metal and flat roofs, RVs and mobile homes, trucks and trailers, skylights and anywhere. 151 (2) Adiseal (1) Bostik (2) Diall (5) Dow (3) Everbuild (6). Existing adhesives are simply not up to the job. Before attempting to get to the roof, you must make sure that the ladder is secure. Understand why the walls and flashing will caus. Inspect the lead. This causes rotting and rust to occur on the windows or wall framing, which can lead to major damage. Average roof repair costs $300 to $1,400. It is a unique hybrid formula that is applicable to wet walls, including underwater. There is no need to bend back the shingles found under the pipe. The other quick, cowboyish alternative is to use flashing tape to seal the box profile against the wall, eliminating the need for the foam filler, and then to flash this against the wall using another strip of flashing. Clear sealants. Flashings are available in a variety of thermoplastic, aluminum, galvanized and copper materials. One laying involves tightly playing sheet metal around the. Laps on lead at 100mm. It is heat-resistant and is used to provide an immediate watertight seal on a huge range of surfaces making it an essential part of any roofing project. APOC. Position the second flashing piece over the second row of shingles, so that its left side matches up with the left side of the second shingle row. Sealants primarily provide a seal between two metal surfaces and are used in conjunction with fasteners. 2. 1. A super reinforced aluminum surface and rubberized asphalt adhesive that will instantly repair gutters and flashings, metal and flat roofs, RVs and mobile homes, trucks and trailers, skylights and anywhere. Read moreThis piece must overlap the last piece of flashing by at least 3 inches. This is a rectangular piece of flashing that is bent 90 degrees in the middle. The flashing needs to be installed before installing the roof shingles. Prep the brickwork. If the old lead is in good condition re install it into the channel over the flashing tape and dress it down over the polycarbonate, sue lead selant to seal the top edge of the lead where it meets the brickwork. Read on for our full roof flashing installation guide:. 13. Lead is soft and highly malleable, making it easy to bend and mold to the roof. 15 3. Lead flashings should always be installed in 1. . Proper flashing around a chimney includes two layers. This one-part, neutral-cure, high-performance silicone-based sealant has been specially formulated for use with lead sheet flashings and its elastic properties make it ideally suited for pointing between lead and brickwork or masonry. All opinions or methods expressed in the video(s) are personal opinion only and for educational purposes only. This is designed to act as a bridge and watertight seal between your property and your conservatory roof. For some reason, though, many builders are neglecting to install sill pans under exterior doors. flashings include: • Apron flashing is an over flashing usually where a roof abuts a vertical wall or penetration. When dealing with a difficult leak, enlist a helper, and then go up on the roof with a garden hose. Slide the bar up beneath the first nail and hit the bar with the hammer until the nail pops out. Top wall flashing makes corrugated roof flashing 75% easier to. Form superior laps: Ensures strong laps even at seams in the flashing; Limits air leakage around windows and doors: Contributes to energy efficiency; Forms a water and air tight seal with building materials; Highly conformable and flexible: Can accommodate settlement and shrinkage movementPitch Pocket (Pitch Pan) • Roof Flashing Explained By Jack Gray, Roof Online Editor • Updated April 21, 2023 See More Roofing Topics Galvanized steel metal pitch pocket on a built-up roof with various conduit penetrations A group of large pitch pans on a PVC roof provide a waterproof seal around angled equipment supports. 2 in. for pricing and availability. Labor makes up around $200 to $350 of your cost to seal a chimney and install a cap. Used to seal gaps, lead & lead roof flashings prevent rainwater from entering a property and protect it against the dangers of damp ingress, making lead flashing roofs extremely durable. Counter flashing. Colour grey. Effective roof flashing around a chimney includes two layers. Low dirt pick up. Our 3-step guide below will show you how to paint lead, sealing the substrate to help prevent it from causing harm. Add to Cart. In order to do so safely, you will need an extension ladder and rubber-soled non-slip shoes. Press the flashing into the urethane to achieve a positive seal. Self-adhesive waterproof flashing 9-in x 25-ft Rubberized Asphalt Roll Flashing. Grey sealants. In this arrangement, first staple felt or building paper to the sheathing, with the top pieces overlapping the lower pieces. Insert into chased out brickwork - fix with Hall Lead fixing clips and seal with Everbuild Leadmate - and finish with Patination oil - all available on EBay. Additionally, if you ever need to redo the roof, it will be a pain to deal with the wires that are now in the way. The sealant providing the optimum properties relating to metal roofing is neutral-cure silicone rubber. 10 Best Sealant For Chimney Flashing. Coping Cover. Whether it’s for a new build or an emergency repair, using Bostik Flashband makes the job quick and easy. In this arrangement, first staple felt or building paper to the sheathing, with the top pieces overlapping the lower pieces. Old flashing will need to be pried off the roof so new flashing can be nailed in its place to strengthen the seal around the base of the chimney. Begin soaking low on the roof, just above where the leak is visible inside the house. On chimney flashing, always scrub away the corrosion with a wire brush as you clean the surface thoroughly with soap and water. and 2 in. Press the new collar down with enough pressure to seal the two together without collapsing the seal around the pipe. Scope. Apply sealant where the base of the flashing will sit, place the flashing. , Safety Rail Systems, Saw Blades, Sealants, Sealing Washers, Snow Guards, Spray Polyurethane Foam, Stinger, Stainless Nails/Fasteners , Tarps, TPO. Further, replace shingles with signs of wear or damage. Make sure the inside of the lead collar fits inside the pipe, then tighten the. Mildewproof and prevents leaks. It’s used as part of the water-resistant barrier and requires a waterproof sealant to bond successfully. 9 /5 · 4 reviews ·Peel & Seal Instant Waterproof Repairs 6-in x 25-ft Aluminum Roll Flashing. Nobody wants a leaky roof or the damage it could cause to yo. Also, it is best to leave lead flashings unfastened on one side to allow movement.