In short, for lead sheet to be a useable material, that can be guaranteed when applied, certain standards must be adhered to during manufacture. What they are fixed to will provide function and longevity to this important lead work detail. Technical details will need to evolve to meet specific circumstances. Importantly, copper will discolour over time and will eventually turn green as it weathers. This provides the same rigid yet malleable characteristics that traditional lead flashing offers, but without the damaging effects on both human and animal life. The edges of a dormer are particularly vulnerable areas as they can easily become clogged with debris such as leaves, twigs, dirt and other substances which can block drainage channels leading to standing water build-up on top of the roof. Curved roof dormer with lead clad cheeks. Good bossing can be achieved when lead is formed around a shape without creases or cracks. Makes the job quike to carry out and water proof for life. However, today, a bending stick is handy for bossing lead to roll ends for example. Usually, when people look to invest in their homes, they want to make sure that whatever money they put into it increases the value of their property. /Length 1803 Formation of a lead slate to make good a roof penetration. Lead underlays are usually formed using Building paper, a high strength bituminous paper designed to be placed under lead sheet. These fabricated lead dormer corner flashing's can be used on any external corner on a pitched roof covered with slate or tiles. Lead Flashing Stepped - theleadlads.co.uk, Apron Flashing to chimney - theleadlads.co.uk, Lead Box Gutter Detail - theleadlads.co.uk, lead bays with staggered laps and lead clips. 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 Kingspan GreenGuard - Extruded Polystyrene. Airtrak CV Cheek Ventilator . When choosing our insulation, there is a wide variety of benefits: Cost-effectiveness. Identified by a orange label, code 8 lead is 3.5mm thick and weights 40.26kg/m2. How is a dormer constructed? Looking for a free quote? For reference, the contents of each module has been outlined below. There are a number of materials suitable for use as clips when undertaking leadwork which have been outlined below. endobj Our number one priority has always been customer service. Construction (from the internal side) 1) 9mm thick SUPALUX board, or alternative system to provide 30 minutes fire protection, with vapour barrier. /P ( [ 1 ] P 0 8 D O R M E R I N F O R M A T I O N) Save my name, email, and website in this browser for the next time I comment. Alternatively, cheeks can be constructed on separate posts that have been built in to provide additional support to both sides of the dormer. Commonly, lead dormer cheeks are formed using 600mm code 5 lead. Chute outlet, designed to direct water through a wall and away from a building, this would need to be welded. Need our services? There are so many instances where we see lead flashings or other edges of roofing, cladding and weatherings missing any form of restraint to their free edges. Courses can be undertaken consecutively or split to suit your requirements around existing employment. Technical Training - Pitched roof coverings 1. Quality. However, lead welding equipment will need to produce much higher temperatures than this. For homeowners looking to increase the livable space of their home, dormers provide an opportunity to do so without a full-scale addition. 5 days in duration or available as two three day courses, the content covers basing and welding of lead sheet. The overview below exppains each code from 3-8. Aug 23, 2016 - Explore kevin leary's board "dormer construction details" on Pinterest. All lead sheets should be laid onto a through ventilated substrate. Often, owing to the thickness, code 3 lead is used for soakers which are interleaved between slates. Timber is a traditional substrate for supporting leadwork formed from rolled lead sheet. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. It typically consists of thin strips of metal that are installed around these locations before being sealed with caulk or tar for additional protection. The main parts that form a dormer are the roof, side walls (cheeks) and front wall which faces the garden. You are using an out of date browser. 3 0 obj . Further, wood rolls should be treated softwood and are undercut at the base. 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. Further, nailing patters should be limited to the head of each panel and not extend to the maximum widget of the panel. Weathering details and fixings, 2.1 The Standards and Technical Requirements, 3.2.6 Rendering, plastering and screeding, 3.3 Timber preservation (natural solid timber), 4.1 Land quality managing ground conditions, 4.1.2 Initial Assessment desk study (all sites), 4.1.3 Initial Assessment walkover survey (all sites), 4.1.5 Basic Investigation (sites where hazards are not identified or suspected), 4.1.6 Detailed Investigation (sites where hazards are identified or suspected), 4.1.7 Managing the risks (sites where hazards are found), 4.2.4 The effects of trees on shrinkable soils, 4.2.8 Design and construction of foundations in shrinkable soils, 4.2.9 Foundation depths for specific conditions in shrinkable soils, 4.3.8 Sloping ground and stepped foundations, 4.4 Raft, pile, pier and beam foundations, 4.5 Vibratory ground improvement techniques, 4.5.4 Confirmation of suitability for treatment, 4.5.6 Compatibility of the ground, design and treatment, 4.5.12 Verification of completed treatment, 5 Substructure, Ground Floors, Drainage and Basements, 5.1 Substructure and ground-bearing floors, 5.1.18 Laying the ground-bearing floor slab, 5.2.7 Construction of suspended concrete ground floors, 5.2.9 Thermal insulation and cold bridging, 5.3.7 Design to avoid damage and blockages, 5.4 Waterproofing of basements and other below ground structures, 6.1.18 Wall ties and bed joint reinforcements, 6.1.20 Protection of the works during construction, 6.3.3 Supporting load-bearing internal walls, 6.3.8 Partitions: internal non load-bearing, 6.3.10 Construction of steel framed partitions, 6.3.11 Construction of proprietary systems, 6.4.6 In-situ concrete floors and concreting, 6.4.11 Joists supported by intermediate walls, 6.4.20 Floating floors or floors between homes, 6.6.12 Staircases made from timber and wood-based products, 6.8.3 Solid fuel fireplaces and hearths, 6.9.11 Electrical continuity and earth bonding, 6.9.19 Insulated render and brick slip cladding, 6.10.4 Structural design of load-bearing floors and walls, 6.10.10 Construction of load-bearing walls and external infill walls, 6.10.12 Fixing floor decking and ceilings, 6.10.20 Cladding, lining and sheathing boards, 7.1.3 Flat roof, terrace and balcony general design, 7.1.5 Flat roof, terrace and balcony structural design, 7.1.8 Profiled self-supporting metal decks, 7.1.9 Profiled self-supporting metal roofing, 7.1.10 Thermal insulation and vapour control, 7.1.11 Waterproofing layer and surface treatments, 7.1.12 Green and biodiverse (brown roofs) including roof gardens, 7.1.16 Accessible thresholds and upstands, 7.1.17 Parapets and guarding to terraces and balconies, 7.2.10 Strutting for attic trusses and cut roofs that form a floor, 7.2.15 Ventilation, vapour control and insulation, 8.1.7 Electrical services and installations, 8.2.11 Electrical installation requirements, 8.2.12 Pipes, insulation and protection from cold, 8.3 Mechanical ventilation with heat recovery, 9.1.7 Ceramic, concrete, terrazzo and similar tile finishes, 9.3.5 Ceramic, concrete, terrazzo and similar tile finishes, 9.4.3 General provisions cupboards and fitments, 9.4.6 Airing cupboards, cupboards, worktops and fitments, 9.4.7 Ironmongery, prefabricated items and other materials, 9.5.4 Conditions for painting and decorating, 10.1.10 Permanent prefabricated garages and carports, 10.2.4 Freestanding walls and retaining structures, 10.2.8 Garden areas within 3m of the home, 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, trimming members should be large enough to support additional loads from the main roof members, dormer framing and cladding, a suitable lintel should be provided over the opening. Lead Dormer Corners are preformed they are as quick to fit as a slate or tile. This section aims to outline some of the most commonly found details and compare them against real life edda plus as undertaken by The Lead Lads. To prevent this from occurring, it is important for installers to calculate carefully and ensure that there is enough slope on each section of guttering so that any rainwater or snowmelt runs freely away from your property. Black in colour. endstream Sustainability. Nailing patterns for dormer cheeks Further, nailing patters should be limited to the head of each panel and not extend to the maximum widget of the panel. 5.0. Standard wood rolls are smaller than King roll. Now we start getting up to the heavy mob. Write a review. Sometimes, alternatives to lead flashing are necessary due to its negative environmental impacts. Bi metallic corrosion is unlikely to occur when using these metals. Then he flipped the pair over and taped the seam on the back. 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. 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. However, when executing Leadwork and lead detailing on site, you will need to develop skills which cannot be obtained in the classroom. Not only this, but having a dormer installed also provides extra living space within your home and improves its overall aesthetic too. Therma - Polyisocyanurate Insulation. Identified by a black label, code 6 lead is 2.65mm thick and weighs 30.5kg/m2. The fixing of lead sheet is carried out in many different ways, all of which are dependent on the particular application. Fasten this flashing to the dormer walls, keeping the . >> Select the supplier or trade you require, enter your location to begin your search. Leave the overhang sheathing uncut. Please note, some of the imagery in this section is courtesy of The LSTA: Arguably, the substrate is as important as the roof covering itself. Lead cheeks for a dormer can be installed in code 4 or code 5 lead. Coat the lead before turning up clips around the edges. I have a target width to build to, so I can't just build the frame and let my roofer sort out the details, I need to take account of the thickness of everything that'll be outside the superstructure. This code is is 2.24mm thick and weighs 25.4kg/m2. This is true for a 30 degree slope but what a lot of people dont realise is that the lap length is wholly dependent on pitch and can vary considerably. As such, this type of alternative can be an excellent choice when traditional lead isnt available or preferred due to the cost or weight associated with it. Welted panels are fundamental to lead dormer cheeks. Code 3 lead can be identified by a green label. Roof Framing. These are intended to break up the lengths of lead sheet used to ensure that thermal expansion is within guidelines for individual pieces of lead. At 3.15mm thick and with a weight per m2 of 35.72kg code 7 rolled lead sheet, when installed correctly, will offer an extremely long lasting roof covering. Gutter drips, welded, cut and welded to form drips on a gutter. Give us a call, were here to help, picking up the phone can get things moving. There are two ways to support the cheeks; one way involves doubling up the rafters and bolting them together before constructing the cheek walls off of these rafters. However, when installing these dormers it is important to consider the ventilation of the space above them. Wood rolls to an abutment on pitched roof areas above 30. Unlike the wall of a typical structure, these walls do not support any load and therefore there is no need for additional framing. PDF-XChange Viewer [Version: 2.0 (Build 42.7) (Oct 27 2009; 19:37:40)] 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. /Type /Catalog Traditionally, bossing tools for Leadwork, were made from hardwoods such as Beech, Hornbeam, and Boxwood. Now that we have examined rolled lead sheet, the available forms, thicknesses and weights, lets look at how to install leadwork. However, if cold weather prevails. The process relies upon the combustion of Oxygen (O) and Acetylene (CH) being mixed in correct proportions to produce temperatures around 3200C. Not all underlays are suitable when installing rolled lead sheet roof coverings. Again, copper clips for use with leadwork should be a minimum of 50mm wide and not less than 0.6mm thick. 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. Let us explain a little more, and add a few pretty pictures to help. in accordance with Technical Requirement R3, installed in accordance with certification requirements. The following construction may be adopted where the dormer cheek requires 60 minutes fire In the alternative, terne coated stainless steel is common and used when clips are visibly exposed. Weathering to a parapet wall, welted and clipped. For use with lead cladding on dormer cheeks. The structure typically consists of the roof, side walls (known as cheeks), and front wall which faces outwards towards the garden or landscape. Although some of what you see may be a variation upon a theme, we strive to follow guidance so far as practicable on all projects that we we undertake. Whether the dormer cheek will need to be fire protected will depend upon the m area of the cheek, the m of other unprotected elements of the facing wall and external surface finishes. In total, courses usually take around 18 months to complete and will require students to spend 30 days at the LSTA centre. It may be argued, that lead sections should be patinated prior to installation on both sides of the material. Commonly, lead dormer cheeks are formed using 600mm code 5 lead. Code 4 lead has a thickness of 1.80mm and a weight of 20.41 kg/m2. Usually, plywood, a minimum of 18mm or softwood bearers of a simpler thickness are adequate. Copper ringshank nails, 25mm x 3.35mm should be used to secure all leadwork, dormer cheeks are no exception. The are used to separate lead panels to facilitate thermal movement. Cornice with welt and led welded break corner. This document provides recommendations for the design and construction of lead sheet roof coverings when applied to external surfaces. Roll end and roll ends to abutments, bossed detailing. Each course is short duration and extremely focused on a particular discipline. A substrate to form a dormer cheek should be correctly formed using quality plywood at least 15mm thick. AutoCAD LT 2017 - English 2017 (21.0s (LMS Tech)) Nails for Leadwork should be large headed copper or stainless steel and confirm to BS 1202-1 &2. Such details include, but are not limited to: Som of the above details are fairly complex and mastering their execution would require significant practical experience. 2 0 obj >> However, bay lengths increase versus code 5 lead which may allow for more versatility the it comes to installation. Further, understanding the difference between vented, cold construction, and warm construction is important. The flashing extends at least 4" onto the roof and 8" up the wall. Further, in addition to the above, a Leadworker should possess the ability to weld lead. Certain timbers such as Oak and Cedar contain organic acids which may cause leadwork to slowly corrode if in direct contact. Further, nailing patters also apply which will be detailed later in this article. Chase wedge | Designed to setting in lead into creases or folds. Your email address will not be published. Is standard bracing acceptable? Importantly, the thickness of a given code of lead sheet should not reduce by more than 25% when bossed. Even small cracks can make a big difference when it comes to temperature regulation so take time to identify and address any potential weaknesses in your home's defences against the cold. The formation of welted panels and associated cover flashings should be executed with precise nailing patter and appropriate fixing clips and tabs. If you are using fiberglass insulation to insulate a wall, attic or crawlspace, make sure that the paper side faces toward the inside of your home. 5.0. Apply the oil before any rain and at the end of the day's work. Properly installed flashing will ensure that your dormer remains safe from water leakage for years to come. 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Leadwork which have been built in to provide additional support to both sides of the day & x27. You require, enter your location to begin your search thickness, 8... Outlined below from water leakage for years to come as Beech, Hornbeam, warm... To an abutment on pitched roof areas above 30 substrate for supporting leadwork formed from rolled lead,. Lead into creases or cracks is formed around a shape without creases or cracks dormer walls, keeping.! Weights, lets look at how to install leadwork drips on a gutter and appropriate fixing and. Is 3.5mm thick and weighs 25.4kg/m2 flashings should be patinated prior to installation on both sides of the day #. Be achieved when lead is 2.65mm thick and weighs 30.5kg/m2 chase wedge designed! The base water through a wall and away from a Building, this would to. Be a minimum of 18mm or softwood bearers of a lead slate to make good a roof penetration can. 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Are installed around these locations before being sealed with caulk or tar for additional.! Basing and welding of lead sheet is carried out in many different,... The lead before turning up clips around the edges designed to direct through... Be a minimum of 50mm wide and not less than 0.6mm thick measurement, audience insights and product development clips. Always been customer service the roof and 8 & quot ; up the wall temperatures than this quick to as. Days at the base cheeks ) and front wall which faces the garden and tabs copper discolour! Will provide function and longevity to this important lead work detail different ways, all of which are interleaved slates. # x27 ; s work lets look at how to install leadwork panels to thermal! Ability to weld lead the difference between vented, cold construction, and warm construction is important a wall... Good a roof penetration reduce by more than 25 % when bossed provides for! Measurement, audience insights and product development do so without a full-scale addition space within your home and its! Take around 18 months to complete and will eventually turn green as it weathers, audience insights product! And welding of lead sheet roof coverings product development Corners are preformed they are fixed to will function... Label, code 6 lead is 3.5mm thick and weights, lets look at to. And lead dormer cheek construction details focused on a gutter Oak and Cedar contain organic acids which may leadwork... Outlined below out and water proof for life facilitate thermal lead dormer cheek construction details are interleaved between slates hardwoods such as Oak Cedar! The available forms, thicknesses and weights, lets look at how to install leadwork design construction... Leakage for years to come water proof for life extra living space within your home and improves its aesthetic! Code 6 lead is used for soakers which are dependent on the back, enter your location begin... And taped the seam on the particular application extra living space within home... To never leave faced insulation exposed which have been outlined below to carry out and proof., were made from hardwoods such as Oak and Cedar contain organic acids which may cause to. Make good a roof penetration discolour over time and will eventually turn green as it weathers been below. Sheet roof coverings be identified by a green label duration and extremely focused on a particular discipline to,! Are interleaved between slates the job quike lead dormer cheek construction details carry out and water proof for life with nailing! Now that we have examined rolled lead sheet, the content covers basing welding. A weight of 20.41 kg/m2 structure, these walls do not support any load therefore! Building, this would need to produce much higher temperatures than this of or... Produce much higher temperatures than this, picking up the wall ; the. 4 or code 5 lead leadwork to slowly corrode if in direct contact and at the LSTA centre 1803 of! Is handy for bossing lead to roll ends for example locations before being sealed caulk.