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Knauf Fireshield is a specifically developed plasterboard providing increased fire resistance when used in partition, ceiling and lining systems and also for encasement and shaftwall systems. Thermal Conductivity - 0.24 W/mK.
Price: £ 14.82
(£17.78 inc VAT)
Celotex TD4000 provides a quick and easy method of achieving effective thermal insulation in light traffic, ventilated, lead covered, warm flat roof applications - includes 5.5mm WBP plywood. Thermal conductivity – 0.022W/mK
Price: £ 116.74
(£140.09 inc VAT)
DriTherm 37 Cavity Slabs are for the thermal insulation of masonry cavity external walls, either partially filling or fully filling the cavity. Thermal conductivity - 0.037 W/mK
Price: £ 32.50
(£39.00 inc VAT)
Depending on the raw material used for production Mineral Wool insulation can be categorised into two products - Glass Wool and Stone Wool. Glass Wool insulation is made from fibres of glass and Stone Wool insulation is made from fibres of volcanic rock arranged into a texture similar to wool. Thanks to their porous structure Stone Wool and Glass Wool insulation offer outstanding thermal and acoustic properties.
Mineral Wool insulation products are characterised with the following benefits:
low thermal conductivity (lambda value - λ)
very good acoustic performance – can reduce level of noise up to 25%
great fire resistance – can hold back the fire and prevent it from penetrating from one room to another
products with higher densities (100kg/m3) offer grater compressive strength and can withstand bigger loads
have vapour permeable capabilities - can drain excess of water vapour eliminating the risk of condensation and allowing walls to breathe
are not subject to biological corrosion
wool insulation products are flexible and therefore can easily adjust to different shapes of the construction
can be very easily cut and shaped
Glass wool insulation is manufactured by mixing recycled glass with borax and soda ash. The mixture is than transferred to a furnace where it is heated at 1200°C to become molten glass. The molten glass falls down into a fiberizer where is spun out into fine threads. This method looks similar to making cotton candy. The raw wool is than treated and backed at 260°C to cure and harden it into the final product. During this process Glass Wool obtains highly resilient structure which allows the product to fit snugly between insulated surfaces.
Different forms of Glass Wool insulation and its application:
Slabs / Batts – typically used for insulating cavity walls, external walls and partition walls. Glass wool slabs can be found with a variety of facing/backing auto adhesively applied during manufacture; glass tissue, impregnated paper or aluminium foil
Lamella Mats – made from narrow pieces of glass wool joined together with a layer of reinforced aluminium foil; used for thermal insulation of pipes, boilers and tanks. Several types of facing/backing can be applied during manufacture: paper, glass tissue or aluminium foil
Granules – loose particles of glass wool impregnated with mineral oil (to prevent soaking). This type of material is used for insulating limited access areas; it can also be used for insulating cavity walls provided that the cavity has a minimum width of 50mm
Primary ingredient of stone wool is volcanic rock (basalt) which during manufacturing process is melted at a temperature of about 1600 °C. Molten rock is then run through high speed spinning wheels to produce fibres - somewhat like the process used to prepare cotton candy. Food grade starch is used to bind fibres together and oil is added to reduce dusting. Density of stone wool insulation defines physical, thermal and acoustic properties of the product and therefore its application.
Different forms of Stone Wool insulation and its application:
• Flexible Slabs (with densities of up to 60kg/m3) are used for insulating timber and steel framed constructions e.g. insulation of floors between joists, floors of unutilised roof voids (loft), suspended ceilings, wooden ceilings, partition walls finished with plasterboard and pitched roof rafters. This type of stone wool insulation has a low compressive strength and cannot be used in areas exposed to heavy loads.
• Semi-rigid Slabs (with densities between 80-120kg/m3)
• Rigid Slabs (with densities between 130-180kg/m3)
Rolls/Mats - typically used for insulating floors of unutilised roof voids, timber floors between joists and pitched roofs between rafters. Surface of the product can be finished with thin wire mesh, aluminium foil or glass tissue facing.
Coats – intended for thermal insulation of pipes; can be faced with aluminium foil or glass fibre mesh
Granules – used for thermal insulation in areas where restricted access is present
Stone wool must be kept dry at all times. Wet insulation will irreversibly lose its thermal performance; if exposed to excessive moisture for prolonged periods product will rot producing very unpleasant smell
Stone wool insulation should not be installed if the product shows any signs of damage. Each fracture, tear, excessive squeezing or extracted fibres will increase the risk of thermal bridges
Mineral wool will produce substantial amount of dust when cut and shaped which can irritate the skin and lungs when inhaled. Protective clothing, goggles, dust mask and gloves should always be worn when handling and installing mineral wool insulation products