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Lonsdale Metal We are currently open and operating within Government Guidelines for manufacturers. For the safety of all staff and customers, any visits to our premises must be by pre-arranged appointment and social distancing observed. We're here to deal with your orders and enquiries, but please be aware that lead times for some products are longer than usual.

Manufacturers of quality rooflights, skylights, roof lanterns, roof windows and patent glazing bars. Lonsdale are specialist manufacturers of high quality roof light and patent glazing systems suitable for domestic conservatories, orangeries, glass rooms and commercial canopies, walkways and large area overhead glazing. Our range includes fixed, opening and walk-on glass rooflights, roof lanterns, glazing bars and bespoke rooflights to any shape and size.

All our overhead glazing systems are available supply only or via our national network of registered rooflight installers. We offer prompt delivery countrywide and all our roof glazing systems are designed and manufactured to the highest standards for maximum safety, durability and strength.
Highlights

read more › Lonsdale provides you with concise and reliable information to help designing and specifying glass roofs that bit easier. Follow our guidance and you can be sure your projects will feature safe and weather-tight roof glazing that will give many years good service. Please take a look at the Design & Regulations pages on the website which are likely to answer any queries you may have. However, if you can't find what you need, please contact our Technical Department where our experienced and helpful team can offer you further advice.

read more › We offer stock lengths or a design and fabrication service with all materials, pre-drilled, cut to size complete with all necessary fittings and fasteners ready for immediate installation. Thermally broken aluminium sloped glazing system suitable for commercial, public and domestic buildings. Designed to conform with the requirements of BS5516 2004 Parts 1 & 2 for the design & installation of sloping and vertical patent glazing when installed within the manufacturers recommendations.

read more › Welcome to Lonsdale Patent Glazing and Rooflights, precision manufacturers of contemporary and traditional sloped glazing systems for commercial and domestic buildings. We offer a wide range of aluminium systems for glass roofs for small and large projects. From major stations, museums, shopping centres, schools and universities to modest domestic extensions and bespoke projects, we have the right skylight at the right price. Patent glazing has developed over the years and is no longer only suitable for unheated spaces such as stations, markets and covered ways as modern systems provide excellent thermal insulation and air-tightness when used with double or triple glazing.

read more › At Lonsdale, we specialise in bespoke rooflights and have provided overhead glazing systems for many important and historic buildings. Toughened or laminated safety glasses MUST be specified for overhead glazing. Toughened glass is heat treated so that when broken it shatters into tiny small dice that even if they fall are so small they are unlikely to cause injury. However, it does make less mess and should not be fitted over swimming pools or food preparation areas as can be very difficult to ensure recovery of every fragment.

read more › Glass roofs come in many shapes and forms from a small flat rooflight on a typical home extension to a large roof glazing structure on a major shopping centre or train station. A rebated timber rafter is the most basic of methods where the glass is usually seated on a glazing tape and then a continuous wooden capping with mastic tapes clamps the glass in place and keeps the water out. This used to be a popular method in Victorian times and still sometimes see today even on high-end timber conservatories, but it is not a satisfactory method and leaks often occur due to movement in the timber.

read more › A range of standard sizes are available from stock within 4-5 days with non-standard rooflights usually delivered within 10-14 working days. Heat soaked tested toughened glass is used for maximum strength and laminated glass inner pane is available to order if required. Non-fragile rooflights are available by using upgraded glass in accordance with CWCT TN92 non-fragility recommendations. A range of fixed glass rooflights in various shapes and sizes are available, so don't be limited to square or rectangular shapes!

read more › Our GlazaTherm ventilator goes through a 12 step manufacturing process to ensure weather tightness and durability you can rely on again and again. Manufactured from thermally broken aluminium using the proven polyamide technique for maximum thermal performance, GlazaTherm provides a cost effective way of ventilating both commercial buildings and conservatories. A range of factory fitted opening mechanisms are available for both manual and electric operation for both day to day and smoke ventilation in accordance with EN12101.

read more › PlasGard is a simple two part glazing bar with continuous screw on cap. Approved by all the major polycarbonate sheeting manufacturers for use with multi-wall and solid plastics, PlasGard is also suitable for single glazing with glass from 6mm to 25mm. Ideal for unheated spaces such as canopies, verandahs, car ports, shelters or rail platforms. Easy to install, PlasGard glazing bars offer excellent value and a wider glazing rebate providing superior glass retention for exposed locations or areas where bomb-blast mitigation is required making it ideal for large public transport hubs and rail stations.

read more › SkyGard is a traditional inverted 'T' bar design ideal for unheated spaces such as canopies, walkways, verandahs, car ports, shelters or rail platforms. The simple design means it is suitable for both new build or refurbishment including heritage buildings where a traditional patent glazing system is required. Easy to install, SkyGard glazing bars offer exceptional value to the building owner and fast installation times for contractors. Please note the above table is for guidance only, for although the glazing bars can be used in compliance with the requirements of BS5516 SkyGard maximum recommend spans may not always comply.

read more › SpanGard self-supporting aluminium roof lanterns and skylights are manufactured from the ThermGard patent glazing system providing excellent thermal performance. Each rooflight is pre-built in our factory and fully fabricated ready for immediate installation on site. The integrated aluminium cill, ridge, hip & eaves members enables roof pitches from 15° to 45° and in some instances beyond, subject to overall width dimensions. Able to span up to 6m wide by infinite length without additional supporting steelwork, thus reducing costs & liaison between trades on site.

read more › Selecting the right choice of glass for a conservatory, roof light, commercial atrium or other overhead glazing installation is paramount in determining a comfortable environment within the building whatever the weather outside. From long experience, Lonsdale has worked with major glass manufacturers to determine the very best, high performance specification and glass combinations. For domestic projects price remains an important consideration, so we have sourced the best performing glass types at sensible prices to give excellent all year round comfort.

read more › ThermGard-R aluminium glazing bars for timber rafters provide the ideal combination of the natural beauty and warmth of timber inside a weather-tight, maintenance free external finish. The carrier rail features integral drainage channels to ensure in the unlikely event that water penetrates the capping and high-performance gaskets, it is safely transported to the outside of the building. A continuous screw on pressure plate with provides outstanding glass retention and a choice of decorative external covers are available to provide either contemporary glass roof appearance or a more traditional heritage style for roof lanterns on period buildings.

read more › A neat 40mm wide box bar design, ThermGard provides a cost-effective alternative to more expensive sloped curtain walling systems without sacrificing aesthetics. Various slim-line box rafters are available to suit small or large spans. Alternatively the carrier rail may be mounted on top of continuous timber rafters - see our ThermGard-R glazing bars. A continuous screw on pressure plate with gaskets provides outstanding glass retention and a choice of decorative external covers are available to provide either contemporary glass roof appearance or a more traditional heritage style for roof lanterns on period buildings.

read more › In usual environmental conditions, we recommend annual inspection of the patent glazing system and any incorporated components by those responsible for the building's maintenance. Please refer to the Maintenance Check List at the end of this document which should be photocopied and used as a record of inspections. If it is known that the environment may be aggressive, such as a chemical factory, marine environment, polluted or similar, the intervals should be increased to quarterly or six monthly inspections depending upon the severity of the problem.

read more › NBS Plus is a library of technical product information written in NBS format and linked to NBS clauses and clause guidance. As a member of NBS Plus, Lonsdale Metal Company can provide you with a bespoke NBS specification for your next project. Please contact our Technical Services team if you require a specific NBS specification or you require assistance with specifications and technical services.

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