Meir Roofing

Combining high performance polycarbonate sheet with aluminium glazing bars creates an extremely versatile vault system with opening, closed or ventilated options.

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Milled, cast and sand cast lead is available in a variety of thicknesses and widths along with all accessories including motifs, timber, slates, patination oil.

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The tapered roof system is installed on flat roof decks and is designed to provide a positive slope to facilitate roof drainage avoid ponding.   We offer survey, design, fabrication and supply of tapered roof insulation schemes which provide tailored and bespoke solutions to flat roofs whilst taking into consideration current regulations and cost/ budget criteria.   Available in Rigid Polyurethane and Polyisocyranate, Extruded Polystyrene XPS, Expanded Polystyrene EPS, Cork and Cork Composites, Rock-Mineral Fibre, Foamglass.

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Extruded polystyrene boards have similar thermal movement and heat sensitivity characteristics to expanded polystyrene but have an improved thermal conductivity, low water absorption, high compressive strength, is flame-retardant, reduces thermal stress and saves heating and cooling energy. When selecting a thickness to achieve a specific U-value for an inverted roof, it is necessary to allow for the loss in efficiency due to the cooling effect caused by water draining through the insulation. The normal method to take this into account is to add 20% to the thickness of the board. The cooling effect can be reduced by the use of a suitable waterproofing membrane laid on the top of the insulation.   It is suitable for a number of applications including walls, floors, car park, high compressive strength applications and because of its exceptionally resistant to water absorption is suitable in an inverted roof system. Application in the protected membrane roof system consists of laying the boards loose above the waterproofing with anchorage against wind uplift and protection from ultra-violet degradation provided by a loading coat of gravel with a minimum size in the order of 20mm or paving slabs. A suitable loose laid geo-textile underlay may also be applied to even out surface irregularities or, if the waterproofing has a rough or sharp surface, to prevent abrasion to the underside of the board. Fine granules can work their way through the joints of the insulation and can cause damage and instability if they accumulate on the underside of the insulation. If it is expected that significant quantities of fine gravel will be present, it will be necessary to add a filter layer on top of the in addition to the waterproofing membrane insulation to act as a sieve and prevent the passage of fine material through the joints blowing under them
Interlocking extruded polystyrene panels are available with a decorative cementitious surfacing, to provide an inverted roof which is light weight, but will not need additional loading. The interlock ensures safety against wind forces within limits prescribed by the manufacturers. A special grade of panel is available with a reinforced decorative cementitious surfacing for pedestrian terrace decks. This surface is suitable for foot traffic only or light maintenance traffic. It is desirable to provide an even substrate which is free of undulations and which provides a continuous support for the panels. This will reduce the risk of panel breakage under foot traffic. The roof system must be impermeable and secure against wind. Panels must be protected from wind, edges against parapets and abutments should have panels set back about 50mm and the space filled with clean gravel. Panel joints are set open by 1mm to allow for thermal movement. The roof waterproofing should be installed to falls to prevent significant ponding, which could give rise to the flotation of the panels which may result in the need to install additional loading to prevent floatation. In all cases the detail of design and application must be in accordance with the manufacturer’s instructions

Cellular glass is made from pure glass, expanded during manufacture and formed into slabs which are inorganic, resistant to attack by birds and vermin, almost impermeable to water, will not gain moisture by vapour diffusion, will not rot or decay and is non-combustible. It can be laid without a vapour barrier, provided that the joints are sealed in bitumen according to the manufacturer’s instructions. Cellular glass provides a stable base for mastic asphalt and fully bonded built-up roofing. When mastic asphalt is applied, two layers of loose laid non-bituminised paper are required between the slabs and the sheathing felt isolating membrane to prevent adhesion of the asphalt. Slabs are available in constant thicknesses or tapered to provide falls and suitable for roofs, floors, and walls and is available in cut to falls.

Mineral wool is manufactured from volcanic rock, melted at extremely high temperatures. The molten rock is then directed onto a series of rotating wheels where it is converted into thin fibres and during the process a resin is added to act as a binding agent. The fibres are gathered together to form a mat, which is then cured and compressed to form a rigid insulation slab which provides a good level of thermal insulation is dimensionally stable substrate has excellent compressive with high laminar strengths and a high resistance to combustion. Various types of facings are factory bonded onto the slabs to one side to control the surface absorption of bitumen allowing it to be used for flat roofing. It is available in flat and cut to falls systems.

With the return to the use of traditional materials it has become increasingly popular to enhance lead-work with the use of decorative motifs. Available in various sizes they give an attractive finish to lead hopper heads and down pipes.

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Pre-cast concrete slabs for use as protection to inverted roofing and walkways to provide a decorative finish. The comprehensive range includes traditional York stone, Saxon and Heritage paving.

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Roof gardens, leisure areas, walkway and pedestrian areas can now benefit from the use of paving pad supports which allow for quick and easy installation and free draining of paved areas.

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A naturally occurring volcanic rock formed when cooling molten magna comes into contact with water and which causes powdered Perlite to expand some 20 times when heated. During manufacture, the Perlite is combined with mineral fibres and binders to produce a roof board that is incombustible, thermally insulating, have a good compressive strength but low laminar strength, are rather brittle, whilst being ecologically friendly and resists decay but the absorption of moisture can cause significant loss of strength chemically neutral and rot proof. One surface of Perlite board is usually treated during manufacture with a bitumen emulsion to increase resistance to bitumen absorption and bind the surface. They have a very low coefficient of thermal expansion and will accept fully bonded waterproofing systems. Because of the dimensional stability and heat shielding qualities it often used to improve the performance of other insulants such as polystyrene, rigid urethane or phenolic either as an on site overlay to these materials or fully bonded composite form with a minimum 25mm thickness being recommended. It is used extensively where fire protection or high compressive strength is required.

Suitable for bonding faced roof insulation, especially polystyrene, polyurethane and mineral wool onto concrete surfaces, profiled steel and timber roof decks.

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Is a flexible, easy to handle, puncture resistant board manufactured cellulose fibreboard impregnated with bitumen. It is resistant to ground salts and most corrosive chemicals.

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Environmentally friendly polyurethane boards (PUR) and (PIR) boards are foamed with an inert gas or blowing agent that is locked into the cells and gives the board’s better insulation characteristics than foams which have air filled cells. The blowing agent must conform to internationally agreed levels of ozone depletion potential (ODP) and some blowing agents can only be regarded as transitional until all materials are developed to contain no significant ODP. There is no agreed definition of PUR and PIR formulations, but the term PIR type is used to describe rigid urethane foam with increased resistance to high temperatures, sufficient to withstand the heat of mastic asphalt on application. The cell walls are slightly permeable to air and over a period of several years the air will diffuse into the cells until it reaches atmospheric pressure. The thermal efficiency of the foam decreases over this period and this should be allowed for in the figures published for thermal conductivity. A suitable test for thermal conductivity of aged material is the ACERMI test from France and manufacturers should be asked to confirm that their quoted thermal conductivity properly allows for long term ageing. A selection of facings for differing waterproofing systems, flat, composite or profiled boards and cut to falls to ensure that all requirements are satisfied. Unfaced rigid urethane foam is likely to suffer movement from changing temperature and conditions. A glass tissue facing is therefore used to control the foam and produce a stable board to receive built-up roofing and asphalt. Board for built-up roofing is normally faced with perforated layer of bitumen coated glass tissue for good part-bonding of membranes and the board for asphalt is faced with glass tissue only. Partial bonding is not suitable for sloping roofs and a cork or fibreboard overlay should be added to allow a fully bonded system

In a range of materials, including clear or opaque polycarbonate, pvc or acrylic, flame retardant to FAA regulations in single or double skinned, a variety of shapes including dual pitched, octagon, opening or closed, security, and with a variety of kerbs and upstands to satisfy all situations.

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Eco friendly and representing the ultimate in utilitarian design manufactured from SBR rubber granules the tiles are easy draining with a deep channelled base to reduce carbon leaching from the tile.   Complete with plastic spacer and available in three colours.

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A range of silicone, polyurethane, butyl rubber and polysulphide cartridges combined with specialist products such as lead sealants,

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A range of solutions including primers, solar reflective and aluminium paints, rubberised bitumen emulsion, gritting solutions etc in sizes 5 and 25litre.

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Lead slates provide weather-tight joints where flue pipes and soil stacks penetrate a slate, tile, asphalt, felt or lead covered roof. The flexibility of lead allows the slate base to be dressed to tiles of all profiles, avoiding wind lift or chatter problems.

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