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Knauf Moistureshield is a plasterboard manufactured specifically for use in areas of high humidity. The core formulation with silicone additive ensure the boards resistance to moisture. Thermal Conductivity - 0.24 W/mK.
Price: £ 13.70
(£16.44 inc VAT)
Rockwool Rockfloor offers dual density thermal insulation for ground floors and acoustic insulation for separating floors. Thermal Conductivity - 0.038 W/mK.
Price: £ 60.97
(£73.16 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: £ 25.00
(£30.00 inc VAT)
Extruded polystyrene insulation is manufactured through a plastic extrusion process. A foaming agent is added to the molten polystyrene mass after which the mass is pressed (extruded). After material has cooled the obtained product forms porous, closed cell foam with improved water resistance, high compressive strength and greater thermal performance than of standard EPS polystyrene board.
Extruded polystyrene is more than a simple lightweight insulant. The inherent mechanical strength of the product means that a building element or item fabricated with XPS can withstand a wide range of loading situations. Whether subjected to standard domestic loads or heavy industrial loads, in floors, roofs or in panels, XPS is the ideal solution.
Extruded polystyrene boards are almost 100% closed cell and as such are unaffected by moisture. Apart from non-absorbent properties XPS offers increased compressive strength which allows the product to be used for thermal insulation and damp proofing in difficult conditions in areas such as:
Depending on type extruded polystyrene boards come with a variety of surface finishes:
Boards can be found with straight or bevelled edges (tongue and groove or overlapped edge)
Similarly to EPS, extruded polystyrene comes in a range of thicknesses and can be classified according to its vertical compressive strength measured at 10 percent deformation or yield.
Insulation Cart offers extruded polystyrene (XPS) from Cellecta manufacturer who classifies their products with the following codes:
XPS boards are unaffected by moisture and can be used in areas where thermal insulation is exposed to direct contact with water; whether laying XPS boards in a floor (where there is often some standing water) or in a protected membrane roof system (where the insulation is exposed to water) the user can be confident extruded polystyrene will perform as stated
extruded polystyrene offers better thermal performance than standard EPS (lower thermal conductivity)