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Polystyrene External Boards

Most buildings are constructed with solid walls. They don’t have cavities that can be filled or injected with insulation. These solid external walls need to be insulated by adding a layer of insulation to either to the interior face or to the exterior face of the wall. This insulation would slow the movement of heat out through the walls thereby dramatically reducing heating demand. The best method is to insulate the walls on its exterior face.

Thermal insulation of an external wall using a contact method is one of the traditional methods of wall insulation. It can be performed perfectly in both new and reconstructed building. Solid expanded polystyrene (EPS) insulating boards are glued onto the external wall and anchored mechanically and then a thin layer of coloured plaster is applied. Contact insulation is used most frequently in buildings built of bricks but may also be used successfully in modern wooden houses.

The solid wall insulation must achieve a U-value of 0.30 W/m2k, hence at least 90mm of expanded polystyrene insulation needs to be used. Obviously the thicker the material, the better its insulating performance. Expanded polystyrene is one of the least expensive, most cost effective rigid foamed plastic insulations and is an excellent material for wall insulation applications that come with a restricted budget.

Grey Polystyrene (Graphite) is a high quality expanded polystyrene (EPS) board enhanced with integrated graphite within its bead structure. The high-purity graphite particles integrated within the insulation beads reflects radiant heat and significantly improves insulation capability, providing up to 20% greater r-value than traditional white EPS of the same thickness. Warm air always moves towards cold air, In Grey Polystyrene (Graphite) the path taken by warm air moving towards the cold air takes many twists and turns along the way, slowing down the heat transfer, keeping the premises warmer.

CHARACTERISTICS

  • Low thermal conductivity - Due to its closed air-filled cell structure that inhibits the passage of heat or cold, a high capacity for thermal insulation is achieved,
  • Lightweight and ease of handling and installation,
  • Low water absorption - does not absorb moisture and its thermal and mechanical properties are unaffected by damp, humidity or moisture,
  • Chemical resistance - polystyrene is completely compatible with other materials used in construction including cements, plasters, salt etc.,
  • Ageing resistance - material's properties are retained will last as long as the building itself, if properly installed,
  • Polystyrene is not altered by external agents such as fungi or parasites as they find no nutritional value in the material.

INSTALLATION

Render systems

  • Adhesive/levelling compound applied to the external wall,
  • Expanded polystyrene board,
  • Insulation fixings for the reinforcing insulation boards,
  • Metal or fibrous mesh reinforcement,
  • Render system and finish

Cladding systems

  • The actual method of installation will depend on the chosen cladding system.
  • External expanded polystyrene should be cut to ensure a tight fit between the battens and should be wedged into position.
  • If there is an an air gap between the insulation and the cladding, the EPS external boards should be pinned in place using corrosion-free fixings. 
  • A breathable sarking felt should be placed over the insulation, and the edges and joints sealed.
  • As the use of a single layer of EPS external insulation fitted between standard 38-50mm battens will not provide a U-value which satisfies the Building Regulations, a second layer of EPS external board should be fixed over the battens.
  • The cladding system should be efficiently fixed back to the main wall to prevent vertical downward drag of cladding in accordance with the cladding manufacturer’s instructions.

CHOOSE MANUFACTURERS

Brand: Ravago Building Solutions Model and Size: 1250x600mm - 6.0m2
Delivery Time: 2 - 3 working days
50mm Ravatherm XPS X 700 SL Extruded Polystyrene Board is an extremely durable thermal insulation board made of extruded polystyrene offering exceptional thermal performance and versatility. It is a lightweight board that is able to withstand extreme loads. It is highly water resistant polystyrene t..
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Brand: Klimas W-M Model and Size: 50mm-
Delivery Time: 1 - 2 days
50mm Screwed-in Helical Fastener WK-DS is for fixing lightweight non-structural components (max. 5 kg/piece) on polystyrene insulation, for example, fixing elements such as signboards, building numbers, mailboxes, lighting fixtures, motion sensors, etc. They are made from high-quality polyamide and ..
£6.50
£7.80 inc VAT
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Brand: Klimas W-M Model and Size: 67mm
Delivery Time: 1 - 2 days
67mm WK-FT disk cutter is used to cut holes in EWI polystyrenes sheets. The end cap can be installed correctly on the hole and cover it to get a homogeneous surface. The The tool diameter is 66.7mm, which would give an exact 67mm hole. CHARACTERISTICSMade from tough plastic,Would cut 67mm holes..
£7.00
£8.40 inc VAT
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Brand: Klimas W-M Model and Size: Grey - 67mm
Delivery Time: 1 - 2 days
67mm Grey Polystyrene Plug KSG for EWI Polystyrene Sheets used to cover the pin shaft, blocking the thermal bridge giving a homogeneous surface.INSTALLATIONThe hole must be then covered with the grey polystyrene plug to stop any thermal bridging (last picture).CERTIFICATIONEuropean Technical Approva..
£8.06
£9.67 inc VAT
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Abrasive Tool (Grinder) for Polystyrene EWI Sheets Blue Dolphin - 270mm x 130mm
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Brand: Blue Dolphin Model and Size: 270mm x 130mm
Delivery Time: 1 - 2 days
Abrasive Tool (Grinder) for Polystyrene EWI Sheets Blue Dolphin - 270mm x 130mm with an ergonomic plastic handle and removable steel piece. It is used for rasping and smoothing polystyrene boards used for insulating external walls. The abrasive surface shaves off the unwanted sections of the po..
Guide Price: £20.25
£24.30 inc VAT
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Brand: Ceresit Model and Size: CT240
Delivery Time: 2 - 4 days
Ceresit CT 240 Winter is a high quality accelerating additive for wet renders and paints drying under low temperatures in late autumn and early spring times, especially when the temperature fall below zero in the nights. This additive can be used for thin-coat acrylic renders - CT 60, CT 63, CT 64, ..
£8.27
£9.92 inc VAT
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Brand: Ceresit Model and Size: CT280
Delivery Time: 2 - 4 days
Ceresit CT 280 Winter is a high quality accelerating additive for ETICS and wet renders drying under low temperatures in late autumn and early spring times, especially when the temperature fall below zero in the nights. This additive can be used for cement based mineral adhesive mortars - CT 83, CT ..
£6.23
£7.48 inc VAT
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Brand: Ceresit Model and Size: CT17 - 5litres
Delivery Time: 5 - 7 days
Ceresit CT17 Profi is a deep penetrating primer for priming walls, floors, ceilings inside and outside buildings prior to fixing ceramic tiles, pouring floors, fixing floor lining, papering, puttying, painting, or fixing thermal insulation boards. It is highly recommended for aerated concrete, anhyd..
£21.02
£25.22 inc VAT
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Brand: Ceresit Model and Size: ZU White - 25kg
Delivery Time: 1 - 2 days
Ceresit ZU White Polystyrene and Reinforced Mesh Adhesive is a cement-based, polymer-modified adhesive specifically designed for fixing white or graphite expanded polystyrene (EPS) insulation boards to exterior walls. The EPS boards should meet the requirements of external thermal insulation composi..
£21.87
£26.24 inc VAT
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Brand: EWI Pro Model and Size: 25kg
Delivery Time: 2 - 3 working days
EWI-220 Basecoat is  specially designed to fix fibreglass mesh reinforced layer for EPS thermal insulation systems. It can also be used for fixing EPS panels to substrates, such as such as concrete, light-aggregate and cellular concrete, ceramic or silicate surfaces. It can be used in fix EPS p..
£16.20
£19.44 inc VAT
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Brand: EWI Pro Model and Size: 25kg
Delivery Time: 2 - 3 working days
EWI-221 is a winter adhesive that would allow you to work in temperatures as low as zero degrees. It is used to mount EPS boards on to external surfaces and also to fix the reinforcement layer on those boards. Once mixed with clean water it becomes a homogeneous grey adhesive putty. It has excellent..
£15.38
£18.46 inc VAT
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Brand: EWI Pro Model and Size: 25kg
Delivery Time: 2 - 3 working days
EWI-225 Premium is a very strong and most flexible adhesive used to fix polystyrene and mineral wool panels and also to embed reinforced mesh. It consists of mineral binders, synthetic fibres, mineral fillers and modifying admixtures. It is used in render-only systems as a basecoat, where it elimina..
£16.29
£19.55 inc VAT
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Brand: EWI Pro Model and Size: 25kg
Delivery Time: 2 - 3 working days
EWI-269 Lightweight Basecoat is a breathable and flexible levelling adhesive that can be used internally or externally on lightweight masonry structures and stonework. It consists of grey Portland cement, hydrated lime and perlite, and has a declared thermal efficiency of 0.47W/mK. This basecoat can..
£12.83
£15.40 inc VAT
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Brand: EWI Pro Model and Size: 5L
Delivery Time: 2 - 3 working days
EWI-301 Water Based Primer is deep penetrating primer used to prepare walls before installing external wall insulation or render-only systems. EWI-301 limits the absorptive capacity of substrates and also strengthen and stabilise dusty substrates. It helps to enhance adhesion external wall insulatio..
£15.34
£18.41 inc VAT
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PRO Hex and Torx Key Allen Wrench Set with Ball End - Set of 18
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Brand: PRO Tools Model and Size: set of 18
Delivery Time: 1 - 2 days
PRO Hex and Torx Key Allen Wrench Set with Ball End - Set of 18, made from high-quality chrome-vanadium steel with optimised hardness.CHARACTERISTICSMade from high-quality chrome-vanadium steel, Optimized hardness, Chromed key coating, Anti-corrosive, Ball joint allowing the wrench to be tilted up t..
Guide Price: £21.67
£26.00 inc VAT
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