Polyfoam Floorboard For thermal insulation of floors

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1 Strong Water resistant Versatile Lightweight Ozone friendly Recyclable Description is a high performance, 100% ozone friendly, extruded polystyrene, rigid board insulation. It is lightweight, yet has excellent structural strength and long term effectiveness. is available in 3 grades to suit the intended end use of the finished floor: Standard General Domestic Load Flooring Extra Commercial, Industrial Flooring and Cold storage Super Very High Load Commercial, Industrial and Cold Storage floors Super is supplied with interlocking rebated edges. Standard and Extra are square edged boards. Product Data Application is used for the thermal insulation of floors. In flooring insulation, the optimum solution has to: be strong have low moisture absorption be a good thermal performer be structurally stable in the long term be lightweight be easy to install The following range of applications are some of the key areas of use of : General domestic load flooring Housing Offices Schools Hospitals Commercial load flooring Heavier load offices, schools and Hospitals Factory and industrial units Cold Store floors Basement Walls is suitable for almost any floor construction including: Below a concrete slab Below screed on a beam block suspended floor Below screed on a ground bearing concrete slab Below screed on an upper/intermediate concrete slab floor Below chipboard on a beam and block floor Below chipboard on a ground bearing concrete slab Below chipboard on an upper/ intermediate concrete slab floor Under a raft foundation Minimum Design Loads 1 Water Continuous Nominal Thermal performance compressive Long term Occasional vapour Moisture service Thickness Length Width density Conductivity Resistance strength static load loading resistance absorption temp limits (mm) (mm) (mm) (kg/m 3 ) (W/mK) (m 2 K/W) (KPa) (KPa) (KPa) (MNs/gm) (by vol.) (ºC) Standard % -50 to % -50 to % -50 to % -50 to % -50 to +75 Extra % -50 to % -50 to % -50 to % -50 to % -50 to % -50 to +75 Super % -50 to % -50 to % -50 to +75 (1) Design loads by calculated methods. Technical Support tel: fax: TECH@knaufinsulation.com

2 Performance Compression resistance All materials are compressed under load. Insulation materials used in floors should be capable of accommodating the applied loads with the minimum of compression. is highly resistant to compression and withstands both occasional and long term static loads. A factor of safety for design loads of 3 (5 for long term static loads) is applied to the compressive strength of the product as outlined in the product data tables. Moisture resistance The attached detail drawings outline the correct position of. As can be seen in some constructions, the moisture resistance of the board allows it to be laid exposed to ground water, with negligible impact on performance. The board will not provide a water vapour controlling layer, however, it can be laid in ground water or up against wet concrete. Once in position it will not allow moisture to cross through the completed construction. Certification Standard, Extra and Super are third party certified by the British Board of Agrément. Handling and Storage is supplied in polythene packs, labelled with identifying product and manufacturing data. The boards are easy to handle and nonirritant, no special protective clothing is required to install them. products should not be left exposed to prolonged sunlight as this will result in surface degradation. Where outside storage for extended periods is required cover with opaque/light coloured sheeting. Ensure the boards are not stored close to open flame or other ignition source, also avoiding volatile organic compounds and chemicals such as solvents. Thermal insulation is a high performance insulant, with aged quoted thermal performance values. Unlike most other insulants, the effect of moisture on performance is negligible. The actual performance in use of each grade of is outlined in the attached application sections. Fire Performance When is installed in a concrete or timber floor construction it will not contribute to the development stages of a fire.

3 Installation Insulation below concrete slab is laid directly over blinded hardcore. The sand blinding should be level, to receive the insulation boards. is laid in a staggered pattern over the whole floor area. The joints should be tightly butted. A strip of insulation, minimum 25mm thick, should be placed vertically at the slab perimeter to minimise thermal bridging. Ensure these perimeter insulation boards are securely held in place to prevent dislodgement by following work. The damp proof membrane is laid over the insulation and laps with the wall dpc. When placing the concrete floor, spreader boards should be used as necessary to prevent point loads puncturing the dpm. The concrete slab may be screeded or alternatively have a power float finish. This construction is also suitable for basements. Wall insulation to extend at least 150mm below floor insulation 25mm Standard Concrete ground floor slab Damp proof membrane Standard on sand blinding U-values of concrete ground floor slab insulated with Standard U-values (W/m 2 K) Product Thickness Ratio of perimeter (m) to area (m 2 ) (mm) Standard Note: The U-values have been calculated using BS EN ISO 13370: 1998 and assume a clay subsoil with a thermal conductivity of 1.5 W/mK.

4 Concrete slab or beam and block floor with a floating screed is covered by a waterproof membrane/separating layer on which is laid a minimum 65mm thick reinforced sand/cement screed. is suitable for use with thinner, non-standard thickness liquid screeds based on specification advice from the screed supplier. s can be used on a beam and block suspended concrete floor that is the subject of current Agrément Certificate and installed in accordance with, and within the limitations imposed by the certificate. The surface of any floor should be smooth and flat to within 5mm when measured with a 3m straight edge. Provided the surface is smooth and level the insulation may be laid directly onto the flooring system. Otherwise lay a thin levelling screed (this may be the grout with beam and block systems) prior to laying the insulation. Irregularities greater than those detailed above must be removed. A minimum 25mm thick vertical piece of, the full depth of the screed, should be placed around the perimeter of each room to minimise thermal bridging. Ensure these perimeter insulation boards are securely held in place to prevent dislodgement by following work. The slip layer is laid over the insulation and turned up at the junction with the walls. If the project is a refurbishment and secondary damp proofing is required this slip layer becomes the damp proofing as in a concrete slab construction. In a traditional screed, the screed is laid with the wire mesh placed at half the screed depth. It is important to compact the screed well to produce a durable floor surface. Wall insulation to extend at least 150mm below floor insulation 25mm Standard Concrete ground floor slab Damp proof membrane Standard on sand blinding U-values of beam and block ground floor insulated with Standard U-values (W/m 2 K) Product Thickness Ratio of perimeter (m) to area (m 2 ) Standard (mm) Note: The U-values have been calculated using BS EN ISO 13370: 1998 and assume a dense infill block between concrete beams.

5 25mm Standard Concrete upper floors with a floating screed The insulation should be laid over the whole of the concrete floor. s can be used on a beam and block suspended concrete floor that is the subject of a current Agrément Certificate using the procedure outlined above. The perimeter insulation boards are cut to size and placed against the wall perimeter. The vapour control layer is laid over the insulation and turned up at the junction with the walls. The screed is laid, with the wire mesh placed at half the screed depth. It is important to compact the screed well to produce a durable floor surface. Wall insulation to extend at least 150mm below floor insulation Ventilated sub floor Screed or chipboard Suspended concrete floor Isolating membrane Typical U-values of 150mm concrete upper floor with 65mm screed finish insulated with Product Thickness (mm) U-Value (W/m 2 K) Standard Extra/Super Notes: The U-values have been calculated to BS EN ISO 6946:

6 Insulation below chipboard in floating floor on a concrete slab or beam and block floor Standard is laid directly on the concrete floor and overlaid with t&g flooring grade chipboard. The insulation should be laid over the whole of the concrete floor. The surface of the floor should be smooth and flat to within 5mm when measured with a 3m straight edge. Irregularities greater than this must be levelled out. Where a beam and block floor has a camber or uneven upper surface a levelling screed is recommended. Where there is a risk of moisture from drying out of the floor slab, a vapour control layer should be used. The vapour control layer is laid over the insulation and turned up at the junction with the walls. The chipboard is laid in a staggered pattern with all joints glued using a waterproof PVA adhesive. Leave an expansion gap of at least 10mm or 2mm per metre run of floor at the room perimeter. At doorways or access traps to pipework runs the cut edges of chipboard should be supported on preservative treated battens. Flooring grade chipboard Vapour control layer Wall insulation to extend at least 150mm below floor insulation Concrete floor slab Damp proof membrane U-values of concrete ground floor slab insulated with Standard U-values (W/m 2 K) Sand blinding on hardcore Product Thickness Ratio of perimeter (m) to area (m 2 ) (mm) Standard Note: The U-values have been calculated using BS EN ISO 13370: 1998 and assume a clay subsoil with a thermal conductivity of 1.5 W/mK. Technical Support tel: fax: TECH@knaufinsulation.com

7 18mm flooring grade chipboard Vapour control layer Concrete floor slab Concrete upper floors with a floating chipboard deck The insulation should be laid over the whole of the concrete floor. s can be used on a beam and block suspended concrete floor that is the subject of a current Agrément Certificate using the procedure outlined above. The vapour control layer is laid over the insulation and turned up at the junction with the walls. The chipboard is laid in a staggered pattern with all joints glued using a waterproof PVA adhesive. Leave an expansion gap of at least 10mm or 2mm per metre run of floor at the floor perimeter. At doorways or access traps to pipework runs, the cut edges of chipboard should be supported on preservativetreated battens. Typical U-values of 150mm concrete upper floor with 18mm chipboard finish insulated with Product Thickness (mm) U-Value (W/m 2 K) Standard Extra/Super Notes: The U-values have been calculated to BS EN ISO 6946: Technical Support tel: fax: TECH@knaufinsulation.com

8 Insulation of cold store floor insulation is laid directly over a damp proof membrane. The membrane is laid over a sub base comprising concrete screed, heater mat and concrete slab. The heater mat placed below the insulation prevents the subsoil from freezing. A reinforced concrete slab, either power floated or with other specified suitable finish would then overlay the whole construction. Installing the insulation in multiple layers reduces the stiffness of the insulation layer. This helps to reduce any voids forming between the insulation and the frost heave protection layer. Standard is recommended for use in ice rinks. Reinforced concrete floor slab Damp proof membrane Screed Heater mat laid on concrete bedding and protected by screed Concrete sub floor U-values of cold store floor slab insulated with Extra/Super U-values (W/m 2 K) Thickness Ratio of perimeter (m) to area (m 2 ) (mm) ( ) (100+75) (75+75) (75+50) Note: The U-values have been calculated using BS EN ISO 13370: 1998 and assume a clay subsoil with a thermal conductivity of 1.5 W/mK.

9 Waterproof membrane Drainage channel membrane Basement wall Insulation of basement walls Standard is placed against the tanking membrane. For basements between 2.5m and 5m deep Extra is recommended for its greater compressive strength. The s protect the tanking membrane as the excavation is backfilled. A granular backfill or proprietary drainage membrane is recommended to reduce water pressure on the waterproofing system. Carefully backfill with free-draining granular material to hold the drainage cavity membrane and insulation in place. The table shows the U-values for a typical basement wall insulated with Standard. The pattern of heat loss from a basement wall is complex, with the rate of heat loss diminishing as the depth of the basement increases. This is due to the insulation value of the ground behind the basement wall. A method for calculating U-values for basements is given in BS EN ISO and also in BCA/NHBC Approved Document Basement for Dwellings. Typical U-values for basement walls insulated with Extra Basement depth (m) Thickness (mm) Notes: The U-values have been derived from BS EN ISO and BCA/NHBC Approved Document Basement for Dwellings. The calculations assume that the basement floor has a U-value of 0.25 W/m 2 K.

10 What insulation thickness do you need to achieve a U-value of 0.25 W/m 2 K? Step 1 Measure the internal length and width of your floor. Read off the value for P/A from the table below. (If your floor is not a simple shape, refer to the notes below right.) Width in metres Length in metres Note: The above look up table assumes a simple rectangular floor plan and a fully detached building. To calculate the actual P/A, take the internal measurements of the exposed floor perimeter only and calculate the total floor area. Insert them into the formula below to find your P/A Exposed perimeter of floor P/A = Area of floor

11 Step 2 Using the appropriate chart below, find your P/A in the left hand column. Step 3 Read across the chart to the board with the appropriate floor loading to see what thickness is required to achieve a U-value of Beam and block look up chart to achieve U-value of 0.25 W/m 2 K Based on a dense infill blocks between concrete beams Concrete slab look up chart to achieve U-value of 0.25 W/m 2 K Based on a ground thermal conductivity of 1.5 W/m 2 K

12 Knauf Insulation Ltd PO BOX 10 Stafford Road St Helens Merseyside WA10 3NS Ref: PD03003

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