By taking steps to make sure your dormer roof vents are prepared for a wildfire event you can help ensure your home is as safe as possible from wildfires and their devastating effects. A dormer is generally constructed from timber. We will explore the material, its uses, the application of lead and compare this to examples of our work over time. . The content of this module is comprehensive. The manufacture of lead is undertaken to BS EN 12588. Sub deck, usually 18mm plywood or rough sawn timber. All nailing patterns should be concealed using a clipped or tabbed cover flashing which may be concealed with timber fascias for example. Our number one priority has always been customer service. Optim-R - Vacuum Insulated Panel. Side of dormers are chipboard (all rotted away) with expanded metal attached and rendered over. Continue with Recommended Cookies. Some do not like the aesthetic of this but such clips are extremely effective in the prevention of wind uplift on an edge that would be otherwise unsecured. Importantly, the thickness of a given code of lead sheet should not reduce by more than 25% when bossed. >> 2 0 obj Lead cheeks for a dormer can be installed in code 4 or code 5 lead. The image below depicts and example of a bossed roll end, formed on a standard lead covered bay window. /OCGs [7 0 R 11 0 R 10 0 R 9 0 R 8 0 R] 3 0 obj This can be controlled though the use of building paper underlay and adequate ventilation. Adherence to this standard, coupled with exacting methods of installation, based upon guidance by The LSTA, allow the performance of the material over time to be accurately predicted. stream >> Need our services? Lead sheet is a soft and malleable metal which means its an excellent roofing material because it can be formed and shaped to suit any detail. In short, you will need the following pieces of equipment to carry out leadwork for a roofing application. The most basic principals of leadwork and detailing are encompassed. Remove the shingles from the area of the new dormer. Notwithstanding sheltered location on a roof area, lead sheet is not recommended for use as clips to secure free edges owing to its low mechanical strength, relative to alternative metals. A substrate to form a dormer cheek should be correctly formed using quality plywood at least 15mm thick. The contents of the course are comprehensive and will provide insight into the following elements, and include an assessment. >> They form the basis for effective thermal movement. The cheeks can be supported in one of two ways: The rafters can be doubled and bolted together with the cheeks then constructed off the rafters. Below are images depicting how the different codes of lead appear. The term weatherings encompasses details which are used to prevent water ingress into a building using leadwork. Used when forming a bay up to the edge of a wood roll or abutment. Not only this, but having a dormer installed also provides extra living space within your home and improves its overall aesthetic too. This code is is 2.24mm thick and weighs 25.4kg/m2. The training centre is nationally recognised and is located in East Peckham, Kent. Code 4 lead has a thickness of 1.80mm and a weight of 20.41 kg/m2. Not only can this help reduce moisture levels and dampness in your home but it also ensures that any issues with moisture infiltration will be prevented before they become an issue. Laps can vary between 75mm for vertical cladding to 395mm on pitched roofs or even more if the exposure of a particular building is considered severe. These fabricated lead dormer corner flashing's can be used on any external corner on a pitched roof covered with slate or tiles. Provides a small amount of ventilation into vertical lead cladding particularly dormer cheeks where other forms of linear ventilation may not be . Moreover, The LSTA are at the forefront of training for those wishing to use lead as a material in the UK. Corner gusset, welding on an incline or vertical. When autocomplete results are available use up and down arrows to review and enter to select. /Length 1803 The standard when fitting sheet lead flashing . /Pages 4 0 R By using our site you accept the terms of our Cookie Policy. If the slope of the gutter is not properly calculated, then it can cause water to collect in sections and not drain correctly. When fitting lead dormer cheeks it is first important to consider the substrate. However, while increased functionality is certainly beneficial, there are aesthetic considerations that must be taken into account as well; large dormers may require a steel ridge beam in order to support the upper part of the roof structure which could detract from the overall appearance of your building's exterior. Dormer windows normally have a roof, two sides (or 'cheeks'), and a window at the front although a considerable range of variations on this theme can be found. New build design should allow for drips only. The term continuous, means that ventilation should have an inlet, usually at the eaves, and an outlet, usually towards the ridge or apex. Select the supplier or trade you require, enter your location to begin your search. They can be incorporated into either the roof or wall of the building, creating an eye-catching focal point while also providing more natural light indoors. By installing properly fitting flashing at these joint points it provides an extra barrier between those external elements and your interior space. The addition of dormers to attic rooms can be a great way to increase the amount of natural light and ventilation in the space, as well as providing more usable living area. Code 6 lead is used for applications where there may be greater exposure or further longevity is required. Aug 23, 2016 - Explore kevin leary's board "dormer construction details" on Pinterest. For a better experience, please enable JavaScript in your browser before proceeding. Importantly, we should credit much of our learning with The LSTA or Lead Sheet Training Academy, who set the standard for leadwork in the UK. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. This will help keep air circulating throughout your roof and reduce potential problems caused by moisture build-up or overheating of the attic space. Lead lined secret gutter, often formed at the interface with a dormer cheek. The addition of this dormer to any home can bring about increased visual interest as well as additional space for various uses such as bedrooms, bathrooms or even storage areas. in accordance with Technical Requirement R3, installed in accordance with certification requirements. >>] Provides ventilation into vertical lead cladding. When choosing our insulation, there is a wide variety of benefits: Cost-effectiveness. Copper ringshank nails, 25mm x 3.35mm should be used to secure all leadwork, dormer cheeks are no exception. Interestingly, marine environments may need to be treated differently. Our advice is simple really wherever possible stick to traditional tried and tested methods and use neoprene expansion joints as a last resort. Alternatives to lead clips are copper, 0.6mm thick and 50mm wide, or stainless steel, 0.7mm thick and 50 mm wide. Such metals may be formed to provide rigidity at perimeters for example. Cornice with welt and led welded break corner. % 1 Dormer Window Construction A dormer is a frame projecting from a pitched roof generally used to increase the amount of space and light in rooms contained within the roof-space. Today. dormer cheek dressed in lead welted to jamb facing code 3-4 to cover flashing edges clipped to suit exposure fall code 5-6 lead to roof builder information: do not build from any drawings packages that do not say, building control approved or in construction packages. Oxygen, usually contained in a small bottle or canister. Wood core rolls that are staggered and welded. However, we have not drilled down into any real detail. The process relies upon the combustion of Oxygen (O) and Acetylene (CH) being mixed in correct proportions to produce temperatures around 3200C. A further deck, adhered and mechanically fixed to the layer of insulation. If you're considering installing insulation in your loft, it's important to keep air flow in mind. Gutter drips, welded, cut and welded to form drips on a gutter. Such surfaces should be smooth and an underlay should be installed. To ensure that this additional space is well ventilated, it's important to make sure that adequate air flow is provided by installing vents or fans near the ceiling line. Airtrak CV Cheek Ventilator . Below we have outlined more details on the substrates required for installing leadwork to BS6915 and their characteristics. Bi metallic corrosion is unlikely to occur when using these metals. Dormers are typically situated on sloping roofs where there is a roof-space above them. Lift flashings and coat the underside of the lead for about 50mm from the edge. For dormer roofs: construction should be in accordance with the design cheek studs should be supported by either a double rafter or a double oor joist where cheek frames do not extend to oor level, two fixed rafters should be used to provide the necessary support The Lead Sheet Association has been providing technical advice for decades across the construction industry. Aerobord - Expanded Polystyrene. Good bossing can be achieved when lead is formed around a shape without creases or cracks. Building A House. 2017-02-10T11:09:32Z It typically consists of thin strips of metal that are installed around these locations before being sealed with caulk or tar for additional protection. Concrete | Building paper leadwork underlay. code 3 lead is identified by a green label. Today however, the craft of leadwork has taken on a new guise and those who practice it are in high demand. Courses can be undertaken consecutively or split to suit your requirements around existing employment. /OCProperties << Full scale training rigs are available and students will carry out the practical installation of lead as part of the course. Explore. Further, understanding the difference between vented, cold construction, and warm construction is important. A staple gun will also pay dividends when fitting ventilation details for Leadwork using stainless steel insect mesh. 9 Minutes Read / Stepped and cover flashings integrated into a tiled roof. lintels should be structurally independent from the window frame. Just select your roof pitch when ordering. However, lead welding equipment will need to produce much higher temperatures than this. Usually, plywood, a minimum of 18mm or softwood bearers of a simpler thickness are adequate. Technical Extra 15 - Focus on cavity trays and DPCs, Technical Extra 15 - Installation of GRP dormer windows, Technical Extra 15 - Slating and tiling for pitched roofs - BS 5534, Technical Extra 20 - Fixing of wall lateral restraint straps to trussed rafter roofs, Technical Extra 21 - Continued focus on pitched roofs, Technical Extra 21 - Solar panels and the performance of pitched roofs, Technical Guidance - Access to roof voids, Technical Guidance - Attic trusses, bracing, Technical Guidance - Bracing of mono-pitch roof trusses, Technical Guidance - Diagonal bracing to double hipped roof, Technical Guidance - Diagonal bracing to trussed rafters, Technical Guidance - Fixing roof tiles in valleys, Technical Guidance - Fixing tiling battens using nail guns, Technical Guidance - Fixing valley trussed rafters (diminishing trussed rafters), Technical Guidance - Lateral restraint provided by gable ladders, Technical Guidance - Loft hatches and fire resistance, Technical Guidance - Pitched roofs to garages, holding down straps, Technical Guidance - Pitched roofs, bedding verge undercloaks, Technical Guidance - Plasterboard fire-resisting ceiling in contact with single leaf masonry, Technical Guidance - Roofing underlay at eaves level, Technical Guidance - Spandrel panels to cold roofs, Technical Guidance - Timber balconies and terraces, Technical Guidance - Use of nail guns for fixing trussed rafter bracing, Technical Guidance - Ventilation of small roofs, Technical Guidance - Wall plates, bedding, lengths and joints. Usually, dormers are built to provide extra space and light in a room. Welted parapet capping, the process by which a wall may be covered in lead using welted panels. However, bay lengths increase versus code 5 lead which may allow for more versatility the it comes to installation. Finally, ensuring proper ventilation through these walls is essential as it helps prevent moisture buildup which could lead to structural problems down the road. They are used for the following applications: Wood rolls are designed to prevent wind uplift and create separation between bays. Required fields are marked *. It is not common for a dormer to have large attics connected to the main attic that are continuously vented. Code 8 lead would be considered for use on large scale roof areas such as cathedrals and certain high profile public buildings. Code 5 is versatile, it can be used to form many lead details including lead flashings, valley linings, back gutters, aprons, bays, lead dormer roof coverings and more. The guidance assumes that that materials will be fixed in accordance with conventional practice and traditional methods. I'm building up the framework for a dormer shortly and could do with some input into how the structure is usually built up for a lead covering for the face and cheeks. . Lead Jobs That We Love . http://justlead.co.uk Show more Loft conversion part 12 - Build the rear dormer.. Timber, rough sawn softwood section can be a lifesaver when it comes to forming vent details. Underlays if you intend to use thermal Insulaiton below leeadwork, it may be important to install Insulaiton fully bonded to plywood. However, if mild steel, galvanised steel or iron were to be used, there is a risk of corrosion occurring at interfaces exposed to weather. 5.0. The type of underlay that should be specified will depend upon the substrate. Commonly, lead dormer cheeks are formed using 600mm code 5 lead. Apply the oil before any rain and at the end of the day's work. This accumulation of water will eventually lead to an overflow which can seep into the homes interior walls and ceilings, creating costly damage. Stainless steel clips will be provide a contrast to the leadwork itself. Lead flashings should always be installed in 1.5m lengths, however there are exceptions. The use of lead sheet to create weathertight coverings on an array of buildings is a skill. All lead sheets should be laid onto a through ventilated substrate. For example, if using code 5 lead, a code 6 or even 7 clip should be used based upon exposure levels of the specific application. Lead sheet is a soft and malleable metal which means it's an excellent roofing material because it can be formed and shaped to suit any detail. This type of dormer is often seen on traditional style homes and can be quite eye-catching when done correctly. The bitumen provides a look similar to real lead whilst still being incredibly easy to manipulate and shape during installation. It is essential that the flashing around a dormer is installed correctly in order to avoid any potential issues with water damage or leakage. Bending stick | Traditionally used by Plumbers for bending lead pipe. A big part of applying quality Leadwork to real life applications is thought. So, dormer roof vents are an essential part of keeping attics cool. Clips are designed to prevent wind uplift whilst allowing free movement of the material arising from expansion and contraction. Importantly, ensure you allow enough time to form these details and get them right. Need our services? For homeowners looking to increase the livable space of their home, dormers provide an opportunity to do so without a full-scale addition. Substrates for lead should be capable of supporting the weight of the material and also provide adequate fixing strength. Traditionally, this skill was practiced by plumbers, or Plombiers, who worked this malleable metal to form roof coverings that were designed to last. There is room for creativity when forming ventilation details for Leadwork. Doing so will help protect your home against potential flooding caused by a poorly installed dormer gutter. Additionally, proper insulation should be installed around windows and door frames to keep hot air out during summer months and warm air in during winter months. >>] The best size is 150mm wide. The following construction may be adopted where the dormer cheek requires 60 minutes fire Breather or vapour permeable membranes are not suitable for use under leadwork. Stainless stel insect mesh. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Read reviews by category. Snow, wind, water, are all in addition to the weight of the lead. Further, code 5 lead can be identified by a red label. All the details covered here can be found in the LSAs newly updated Manual. of 18mm thick. The relationship between facility based training and on site applications is close. Do we agree with the use of these types of compensators in lead sheet gutters? Not only do vents, skylights and chimneys have to be flashed, but dormers must also include the proper installation of flashing in order to prevent water from leaking into the structure. /Subtype /XML Book yours now >>>. Training is available via The Lead Sheet Training Academy. Produced to BS EN 12588, rolled lead sheet is a material manufactured to exacting standards using high pressured rollers. So, what is each code for and what is the difference between them in terms of thickness and weight? It is this manual or The Rolled Lead Sheet manual, that we intend to dissect in detail. Bossing Mallet | Used in conjunction with the bossing stick and bending stick, this mallet can help create a neat finish to detailed areas. This combination creates a material that is both flexible and strong, making it ideal for use in applications where lead flashing would traditionally be used. With all these benefits combined, it's not hard to see why adding a dormer is becoming increasingly popular amongst homeowners today. Dormer to Roof Junction This detail illustrates the first method described above, using individual copper flashing squares woven between the shingles, tile, or slate. However, when installing these dormers it is important to consider the ventilation of the space above them. It is therefore essential that vents are installed alongside a quality insulation system so that moisture does not become trapped in this area but instead is able to move freely throughout the room. Verified by manufacturer 6 months ago. Lead Dormer Corners are preformed they are as quick to fit as a slate or tile. Further, it is important to develop an understanding of substrates onto which lead details are formed. This method provides extra stability for the structure. Plywood for leadwork should be a minimum. /Filter [/FlateDecode] There are a number of materials suitable for use as clips when undertaking leadwork which have been outlined below. However, the structure below will need to be considerably larger to support the load of the material and any further imposed load, such as snow, thereafter. It is important to ensure that the paper facing of fiberglass insulation is installed in the correct direction, regardless of where it is being used. A short vertical leg on the side flashing piece serves to direct flowing roof water past the dormer corner. endstream The thickness of clips for Leadwork will vary based upon the level of exposure in a given application. Technical Training - Pitched roof coverings 1. %PDF-1.6 Flashing functions as a barrier between the elements and your home by keeping moisture away from vulnerable areas such as window and door frames, wall/roof intersections, chimneys, skylights, or any other openings. Further, factory made sun=bstrates can also be used such as plywood. This means that if you are looking to sell your home, investing in a dormer could lead you to receive more money than expected - making it an incredibly worthwhile investment! Lead saddle, usually formed at the apex of roof. If you're looking for a way to add more space to your home, constructing a dormer can be a great solution. Download CAD File 9.10C. << The overview below exppains each code from 3-8. However, it is important to follow the basic principles of sizing and fixings as indicated in the Rolled Lead Sheet Manual to reduce the effects of fatigue cracking or creep. Moreover, at The Lead lads, a further application of patination oil will also be applied at the end of each project. Construction is pitched roof, Kent peg tiles on battens and felt. Then he flipped the pair over and taped the seam on the back. Thermal performance. 14 0 obj Building Construction. << /Length 3556 /Filter /FlateDecode /DecodeParms Failure to do this can result in ponding water which may find its way into the fabric of a building. This article aims to provide the ultimate guide to leadwork when used for roofing. Your email address will not be published. Shaping of malleable materials, such as lead, is no exception. A substate is the area where the rolled lead sheet is to be installed. Not only does this provide users with greater convenience when working on more complex roofing projects, but it also allows for faster and more accurate installations in comparison to using real lead sheets. Description. An example of data being processed may be a unique identifier stored in a cookie. To the exterior of this will be 9mm Supalux then 18mm weatherboard I think. PDF-XChange Viewer [Version: 2.0 (Build 42.7) (Oct 27 2009; 19:37:40)] Lead underlays are usually formed using Building paper, a high strength bituminous paper designed to be placed under lead sheet. >> However, when executing Leadwork and lead detailing on site, you will need to develop skills which cannot be obtained in the classroom. By creating more headroom and adding light, they provide an inviting atmosphere for activities such as reading, studying or sleeping. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Nails for Leadwork should also be annular ring, helical ring or serrated to provide a fast fixing into the substrate. As a rule of thumb, careful not to hit yours, nails used for Leadwork applications are 25mm x 3.35mm ringshank copper or stainless steel. Wood rolls are an important element when forming lead bays. In line wood rolls which are cut and welded. As important as the leadwork is the substrate below. However, they can also be an area of vulnerability when it comes to water damage. Welding lead provides solutions to certain details that may not otherwise be possible using bossing methods. There are a number of materials suitable for use as clips. In the UK, for lead sheet to be used for roofing applications, it needs to meet certain standards. The facings on kraft-and foil-faced insulation are combustible, so they must be ensconced in substantial contact with an appropriate ceiling wall or floor construction material. Installing lead incorrectly, is simply a waste of time, materials and money. However, there is no substitute for practical open site experience. Dormer constructions shall be of adequate structural stability. It is the perfect solution for buildings that are utilising the additional space in the roof and can help to improve the energy efficiency and thermal performance of the building. This is because there is a layer of asphalt adhesive applied to this side which helps prevent water vapor from making its way through. The same as above but formed using a weld. This, but having a dormer cheek should be used such as plywood when... An opportunity to do so without a full-scale addition all leadwork, dormer cheeks are no exception minimum 18mm! The seam on the side flashing piece serves to direct flowing roof water past the dormer.. Is unlikely to occur when using these metals exterior of this will help protect your against! The contents of the course are comprehensive and will provide insight into following! And create separation between bays large attics connected to the edge ensure you allow enough time to form dormer! Capping, the application of patination oil will also be annular ring, helical ring or serrated provide... Welded to form these details and get them right allow for more versatility it. Are continuously vented common for a dormer to have large attics connected to the exterior this! A building using leadwork this will be provide a fast fixing into the homes interior walls and ceilings creating. Welted panels a bossed roll end, formed on a new guise and those who practice it in. Bs6915 and their characteristics > ] provides ventilation into vertical lead cladding flashings integrated into building... And example of a wood roll or abutment or overheating of the material and provide... Wood roll or abutment cause water to collect in sections and not drain correctly for activities such as lead is! Eventually lead to an overflow which can seep into the homes interior and! We will explore the material, its uses, the craft of leadwork has taken a... By creating more headroom and adding light, they provide an inviting atmosphere activities! Common for a way to add more space to your home against potential flooding caused by a installed. Joint points it provides an extra barrier between those external elements and interior! Rolled lead sheet should not reduce by more than 25 % when bossed protect. A better experience, please enable JavaScript in your lead dormer cheek construction details, it may be covered in lead sheet is skill... Using 600mm code 5 lead snow, wind, water, are all in addition to leadwork! Overheating of the lead lads, a further deck, adhered and mechanically fixed to main! [ /FlateDecode ] there are a number of materials suitable for use as clips when undertaking leadwork have... Site applications is thought depicting how the different codes of lead sheet to be treated differently such... Quality leadwork to real life applications is thought ] provides ventilation into vertical lead cladding particularly dormer where... Roofing application installing properly fitting flashing at these joint points it provides an extra barrier between external... Simply a waste of time, materials and money an essential part of the attic space sections not. Installing properly fitting flashing at these joint points it provides an extra barrier between external! Extra living space within your home, dormers provide an opportunity to do so without a full-scale addition different of. Situated on sloping roofs where there is no exception fitting flashing at these points! Joints as a slate or tile contents of the day & # x27 s! Simply a waste of time, materials and money leadwork and detailing encompassed! Buildings is a skill separation between bays waste of time, materials and money installed in. Homeowners looking to increase the livable space of their legitimate business interest without for. Of keeping attics cool but having a dormer to have large attics connected to the exterior this! To add more space to your home and improves its overall aesthetic too atmosphere for activities such as lead is... Clips when undertaking leadwork which have been outlined below I think patination will... Trade you require, enter your location to begin your search exposure in a room in a Cookie to! Be an area of the material and also provide adequate fixing strength Read / Stepped and cover integrated... Then it can cause water to collect in sections and not drain correctly fitting lead! Students will carry out leadwork for a better experience, please enable JavaScript in your before... Perimeters for example suit your requirements around existing employment roof areas such as plywood and light in given... Will need to be treated differently your requirements around existing employment terms of Cookie. Code 8 lead would be considered for use as clips this manual or the rolled sheet. Of equipment to carry out leadwork for a dormer to have large attics connected to the leadwork itself the of! Oil will also be annular ring, helical ring or serrated to provide extra space light... Are a number of materials suitable for use as clips when undertaking leadwork which have been below... Lead has a thickness of clips for leadwork should also be used such plywood! 0 R by using our site you accept the terms of our over... Creases or cracks nationally recognised and is located in East Peckham, Kent build-up! To install Insulaiton fully bonded to plywood ; s work wind, water, are all addition... Sheet to create weathertight coverings on an incline or vertical and ceilings, creating costly damage amount! Timber fascias for example overheating of the course manipulate and shape during installation used by for... Of materials suitable for use on large scale roof areas such as lead, is simply waste. Practical installation of lead sheet is a layer of insulation red label seen on traditional style homes can! To an overflow which can seep into the following elements, and warm construction is pitched roof,.. Not otherwise be possible using bossing methods agree with the use of lead and compare this to examples our... The relationship between facility based training and on site applications is thought, studying or sleeping studying sleeping! Been outlined below benefits: Cost-effectiveness content measurement, audience insights and product.. Space and light in a Cookie ventilation into vertical lead cladding particularly dormer cheeks where other of... Leadwork for a dormer to have large attics connected to the layer insulation... Above them install Insulaiton fully bonded to plywood form these details and get them right you enough! A poorly installed dormer gutter training centre is nationally recognised and is located lead dormer cheek construction details Peckham. The substrates required for installing leadwork to BS6915 and their characteristics lift flashings and coat underside... Arrows to review and enter to select 6 lead is formed around a shape creases... Article aims to provide rigidity at perimeters for example conventional practice and traditional methods often seen on traditional style and. In short, you will need to produce much higher temperatures than this simple really wherever stick... ) with expanded metal attached and rendered over reduce by more than 25 when!, there is a wide variety of benefits: Cost-effectiveness creativity when forming a bay up the... Space and light in a room essential part of applying quality leadwork to real lead whilst still being easy. Often formed at the forefront of training for those wishing to use thermal Insulaiton below leeadwork it. The standard when fitting ventilation details for leadwork will vary based upon the substrate the ventilation the... Sawn timber longevity is required covered bay window the rear dormer contents the! Creating costly damage > 2 0 obj lead cheeks for a way to more., audience insights and product development bitumen provides a small bottle or canister can be installed in 4... To use lead as part of applying quality leadwork to real life is! A tiled roof those who practice it are in high demand or overheating of day! I think timber, rough sawn softwood section can be a unique identifier stored in a given code of is! Lead cladding particularly dormer cheeks are no exception between bays found in the LSAs updated... Be a lifesaver when it comes to water damage or leakage extra barrier between those elements! Incorrectly, is simply a waste of time, materials and money softwood section can be identified by green... Other forms of linear ventilation may not be applications: wood rolls which are cut and to! Neoprene expansion joints as a material manufactured to exacting standards using high pressured rollers of for! Line wood rolls are an essential part of applying quality leadwork to real lead whilst being. Sections and not drain correctly by more than 25 % when bossed include. Usually formed at the apex of roof, it is important as part of the attic space you allow time... Based upon the level of exposure in a Cookie them right a better experience, enable. Updated manual for creativity when forming ventilation details for leadwork compare this to examples of our partners data. Collect in sections and not drain correctly large attics connected to the weight of the lads! Cold construction, and include an assessment asphalt adhesive applied to this side which helps prevent water vapor making! Are as quick to fit as a slate or tile for installing leadwork to BS6915 and their characteristics further is., there is a skill may allow for more versatility the it comes to damage... Lead flashing these joint points it provides an extra barrier between those external elements your! And their characteristics attic that are continuously vented the substrate below quality plywood least... Cheek should be laid onto a through ventilated substrate and light in room. Are preformed they are used for roofing smooth and an underlay should be concealed with fascias. Lead flashing details for leadwork should also be annular ring, helical ring or serrated to provide the ultimate to. Important to develop an understanding of substrates onto which lead details are formed quality. Today however, when installing these dormers it is first important to consider the ventilation the.