Full Fill Superwall Cavity Slab
Cavity Slab Product
Superwall Cavity Slab is a semi-rigid slab of glass wool with a water-repellent additive. It is dimensioned to fit between wall ties at standard spacing.
Typical Construction
Brick or block outer leaf (which may be rendered), a brick or block inner leaf, a cavity fully filled with Superwall Cavity Slab and an internal finish of either plaster, plasterboard on dabs or fair faced.
For buildings from 12m to 25m high, Agrément Certificate No 89/2231 imposes additional requirements.
Thermal Performance
Superwall Cavity Slab has a thermal conductivity of 0.036 W/mK.
The table gives U-values for typical constructions insulated with Superwall Cavity Slab.
Fire performance
Superwall Cavity Slab is classified as Euroclass A1 to BS EN ISO 13501-1. Superwall Cavity Slab does not prejudice the fire resistance properties of the wall.
Moisture resistance
Tests by the British Board of Agrément (BBA) confirm that Superwall Cavity Slab will not transmit water to the inner leaf. Nor will they transmit moisture by capillary action across the cavity or from below DPC level.
Vapour resistance
Superwall Cavity Slab offers virtually no vapour resistance, allowing water vapour to pass freely through the slab.
System Advantages
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Lowest system width for given U-value
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Can be used in any exposure zone providing it is suitable for the exposure zone in which it is built.
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Lowest overall cost
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Fitted during construction
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Compression fit between slabs eliminates moisture penetration at joints
Certification
Superwall Cavity Slab is manufactured to BS EN 13162 and is third party certified by the British Board of Agrément (certificate no. 89/2231).
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Brick outer leaf/cavity/100mm block inner leaf type/plasterboard on dabs
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Masonry cavity walls U-values (W/m2K) insulated with Superwall Cavity Slab
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Superwall Cavity Slab
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Insulation thickness (mm)
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Dense Block (l=1.13)
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Medium Block (l=0.51)
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Lightweight aggregate(l=0.34)
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Standard aircrete(l=0.16)
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Lightweight aircrete(l=0.11)
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100
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0.32
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0.31
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0.30
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0.28
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0.26
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85
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0.35
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0.34
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0.33
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0.30
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0.29
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75
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0.39
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0.37
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0.36
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0.33
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0.31
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65
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0.42
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0.40
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0.39
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0.36
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0.33
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50
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0.50
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0.48
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0.46
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0.41
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03
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NOTES - The U-values have been calculated assuming that all walls are lined with plasterboard on dabs. Block sizes assumed to be 440 x 215mm, mortar joints assumed to be 10mm wide, wall ties assumed to be stainless steel with a cross-sectional area of 12.5mm2 for 100mm side structural cavities and Ancon ST1 ties for larger cavities. The U-values have been calculated to BS EN ISO 6946: 1997.
Superwall Cavity Slab - Full Fill Built In Installation
| 1 Walls are constructed in the usual manner with the first row of wall ties where the insulation is to begin, but not on the DPC. The first run of slabs may commence below the DPC level to provide some edge insulation to the floor. As Superglass cavity slab is guaranteed not to wick, there will be no risk of capillary action. A section of the wall is built up to course above the next row of wall ties which are placed at the usual spacing of 450mm vertically. |
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| 2 Position the Superwall Cavity Slab against the masonry, taking care that the wall tie drips are positioned halfway across the top edge of the slabs. Where required, the Superwall Cavity Slab should be scribed and cut round the course. Always bring Superwall Cavity Slab to course with wall ties. |
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| 3 The following leaf is then built to the top level of the Superwall Cavity Slab. Do not let the second leaf overtake the Superwall Cavity Slab so as to create a trough. |
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| 4 Proceed in the same manner with the remaining stages of the wall, taking care to remove any residual mortar in the cavity, whilst keeping slab joints closely butted and mortar free. The use of a cavity board will help keep the top edges of the slabs stay clean. |
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| 5 Building can start on either the inner or outer leaf, with Superwall Cavity Slab fixed to the cavity face of the leading leaf. Ensure that the mortar joints are flush within the cavity, taking care to remove any excess mortar before fitting the next cavity slab. |
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Installation Notes
Any thickness of Superwall Cavity Slab over and including 50 mm may be used in full fill applications. Please use the table opposite as a guide to the accepted tolerances relating to the thickness of the Superwall Cavity Slab and the cavity width. The appropriate thickness of Superwall Cavity Slab should be chosen from the table, bearing in mind that it is not generally possible to compress Superwall Cavity Slab during installation as it is likely to dislodge bricks before the mortar has set. Superwall Cavity Slab must be free from mortar droppings so that all joints can be closely butted. Any cutting and fitting should be neatly done to avoid distorting the layers of glass wool within the material. As construction practices will vary from site to site, the illustrations are for a guide only and do not imply that the outer leaf must be built first.
Wall ties and fixing devices
Superwall Cavity Slab is designed to be installed using proprietary insulation retaining wall ties. Generally rows of wall ties should be at 450mm vertical spacing and at horizontal spacing of not more than 900mm or as otherwise required by the structure. Where whole rows of ties are at different vertical spacing, Superwall Cavity Slab should be cut to course with an allowance of an extra 5mm for compression to form close butt joints. Where extra ties are required, e.g. at the side of openings, Superwall Cavity Slab should be cut and fitted carefully around them. When off-cuts of Superwall Cavity Slab are needed, the slabs can be cut with a long bladed knife.
Further Recommendations
When cut strips of Superwall Cavity Slab may be needed around cut openings, particular care should be taken to ensure close fitting and that work is clean and free from debris. Superwall Cavity Slab should not be left uncovered for long periods or in wet weather. If Superwall Cavity Slab is terminated below the highest level of the wall, the top edge of the slab must be protected by a cavity tray and alternate perpend joints raked out to provide adequate drainage of water from the tray.
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Cavity Slab thickness
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Normal cavity width
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Permitted deviation
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150
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150
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-0 +20
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125
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125
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-0 +15
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100
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100
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-0 +15
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85
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85
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-0 +15
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75
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75
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-0 +15
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65
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65
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-0 +10
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50
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50
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-0 +10
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Superwall Cavity Slab - Full Fill Built In Installation
Good Practice
| 1 Do not push slabs into the cavity as there is a danger that mortar snots may be dislodged and cause bridging. |
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| 2 Do not lay a Superwall Cavity Slab on other slabs, which have not been cleaned of mortar droppings. |
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| 3 Do not tear or impale Superwall Cavity Slab. If there are protrusions into the cavity, Superwall Cavity Slab should be carefully cut to fit, particularly where there are extra wall ties around openings. |
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| 4 When using small off-cuts, they must be fitted with the fibre orientation parallel to the plane of the wall. |
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Partial Fill Superwall Cavity Slab
Cavity Slab Product
Superwall Cavity Slab is a semi-rigid slab of glass wool with a water-repellent additive. Each slab’s dimension’s allow it to fit between wall ties at standard spacing.
Typical Construction
Brick or block outer leaf (which may be rendered), brick or block inner leaf, the cavity partially filled with Superwall Cavity Slab with an internal finish of plasterboard on dabs, or fair faced.
BBA approval means that in many instances a minimum 25mm residual cavity needs to be maintained. In more exposed areas, buildings over 12m in height and for dwellings subject to NHBC inspection, a 50mm residual cavity should be maintained.
Thermal Performance
Superwall Cavity Slab has a thermal conductivity of 0.036 W/mK.
The table gives U-values for typical constructions insulated with Superwall Cavity Slab.
Fire performance
Superwall Cavity Slab is classified as Euroclass A1 BS EN ISO 13501-1. Superwall Cavity Slab does not prejudice the fire resistance properties of the wall.
Moisture resistance
Tests by the British Board of Agrément (BBA) confirm that Superwall Cavity Slab will not transmit water to the inner leaf. Nor will they transmit moisture by capillary action across the cavity or from below DPC level.
Vapour resistance
Superwall Cavity Slab offers virtually no vapour resistance, allowing water vapour to pass freely through the slab.
System Advantages
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Retains minimum 25mm clear cavity
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Can be used in any exposure zone
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Lowest cost solution
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No water penetration at joints, due to compression fit between the slabs.
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Built-in during construction
Certification
Superwall Cavity Slab is manufactured to BS EN 13162 and is third party certified by the British Board of Agrément (certificate no. 89/2231).
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Masonry cavity walls U-values (W/m2K) partially insulated with Superwall Cavity Slab
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Superwall Cavity Slab
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Insulation thickness (mm)
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Dense Block (l=1.13)
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Medium Block (l=0.51)
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Lightweight aggregate(l=0.34)
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Standard aircrete(l=0.16)
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Lightweight aircrete(l=0.11)
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100
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0.30
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0.29
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0.29
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0.27
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0.25
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85
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0.34
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0.33
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0.32
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0.30
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0.28
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75
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0.36
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0.35
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034
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0.31
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0.29
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65
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0.39
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0.38
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0.36
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0.33
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0.31
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50
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0.46
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0.44
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0.42
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0.38
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0.35
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Superwall Cavity Slab 34 & 32
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75
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0.35
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0.34
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0.33
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0.31
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0.29
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NOTES - The U-values have been calculated assuming that all walls are lined with plasterboard on dabs. Block sizes assumed to be 440 x 215mm, mortar joints assumed to be 10mm wide, wall ties assumed to be stainless steel with a cross-sectional area of 12.5mm2 for 100mm side structural cavities and Ancon ST1 ties for larger cavities. The U-values have been calculated to BS EN ISO 6946: 1997.
Superwall Cavity Slab - Partial Fill Insulation
| 1 A section of the leading leaf is built with the first row of wall ties positioned where the cavity slab is to begin but not at the DPC level. The first run of slabs may commence below the DPC level to provide some edge insulation to the floor. Superwall Cavity Slab will not to wick and there is no risk of capillary action. |
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| 2 The leading leaf is then built up to the required height, with a second row of wall ties at 450 mm spacing. The slabs are fitted between the upper and lower wall ties, behind the retaining clips to form a closely but-jointed run. The remaining leaf is then built up to the top level of the insulation ensuring that the designed residual cavity of at least 25mm is maintained. In buildings over 12m in height and for dwellings covered by the NHBC, 50mm wide residual cavity is required in more exposed areas, which must always be kept clear of mortar droppings. The use of cavity battens and boards is recommended. |
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| 3 Successive sections of wall, incorporating wall ties, are constructed and Superwall Cavity Slab installed as work proceeds to the required height. |
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| 4 Insulation retaining clips can be used in conjunction with wall ties to hold the cavity slabs in place. These clips penetrate the Superwall Cavity Slab and are pushed into the joints of green mortar. This type of clip may also be used where it is not possible to secure the insulation in place with wall ties, for example below sills or eaves. The clips should be fixed at horizontal spacing of 400mm. |
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Installation Notes
Any thickness of Superwall Cavity Slab up to 100 mm may be used in partial fill applications. Care should be to be taken to ensure that there is no excess mortar is left at joints, which are required to be closely butted and free of debris. When Superwall Cavity Slab is being installed, be sure to cut it neatly and precisely in order that it fits snugly into place without bowing and distorting. Superwall Cavity Slab is supplied in 1200mm x 455mm slabs for use between wall ties at 450mm vertical centres. When off-cuts are needed, the slabs can be cut with a long bladed knife.
Wall ties and fixing devices
Superwall Cavity Slab is designed to be installed using proprietary insulation retaining wall ties and clips. Ensure that you follow manufacturer’s instruction so that you match the correct tie with the approved cavity width. The first course of Superwall Cavity Slab should be fully supported either on wall ties at approximately 600mm horizontal spacing or on the weak concrete at the foot of the cavity, or on a cavity tray.
Start the wall insulation at least 150mm below the top of perimeter floor insulation and support on row of wall ties. Superwall Cavity Slab does not wick.
Generally rows of wall ties should be at 450mm vertical spacing and at horizontal spacing of not more than 600mm as required by the structure. Where whole rows of ties are at different vertical spacing, Superwall Cavity Slab should be cut to course, to form close butt joints. Where extra ties are required, for example beside openings, Superwall Cavity Slab should be cut and fitted carefully around them.
It is essential that all wall ties slope downwards toward the outer leaf with the drip located at the centre of the cavity.
Good Practice
- Do not push slabs into the cavity as there is a danger that mortar snots may be dislodged and cause bridging.
- Do not lay a Superwall Cavity Slab on other slabs, which have not been cleaned of mortar droppings.
- Do not tear or impale Superwall Cavity Slab. If there are protrusions into the cavity, Superwall Cavity Slab should be carefully cut to fit, particularly where there are extra wall ties around openings.
- When using small off-cuts, they must be fitted with the fibre orientation parallel to the plane of the wall.
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Injected Full Fill Instafibre
Instafibre Wool Product
Instafibre blowing wool cavity wall insulation is a loose glass mineral wool insulation material, designed to be injected into existing or newly, built cavity walls. Instafibre Cavity Wall Insulation is available only through approved installers fully trained by Instafibre and approved by the British Board of Agrément. A list of Approved Installers is available on request.
Typical Construction
Brick or block outer leaf (which may be rendered), a brick or block inner leaf, the cavity fully filled with Instafibre blowing wool cavity wall insulation, with an internal plaster finish or plasterboard on dabs. Tests by the British Board of Agrément confirm that Instafibre blowing wool will not transmit water to the inner leaf, nor will it transmit moisture by capillary action across the cavity or from below the DPC level. Independent research conducted for the DETR confirms that cavity wall insulation does not add to the risk of water penetration.
Instafibre blowing wool insulation offers virtually no resistance to water vapour allowing it to pass freely through, permitting the wall to breathe.
Performance
Instafibre blowing wool insulation will neither settle nor deteriorate with age. As a result it will remain a highly effective insulating material for the life of the building.
The operations of all approved contractors are rigidly monitored by Instafibre and the BBA in accordance with the terms of the BBA Certificate.
Thermal performance
Instafibre Yellow & White blowing wool cavity wall insulation has a thermal conductivity of 0.039 & 0.040 W/mK respectively. The table gives U-values for typical constructions insulated with Instafibre blowing wool cavity wall insulation.
Fire performance
Instafibre blowing wool cavity wall insulation is noncombustible when tested to BS 476: Part 4: 1970 (1984), therefore its installation will not adversely affect the fire rating of the wall, nor will it become a toxic hazard in fire conditions.
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Masonry cavity walls U-values (W/m2K) insulated with Superwall Instafibre Wool
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Superwall Instafibre Wool
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Insulation thickness (mm)
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Dense Block (l=1.13)
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Medium Block (l=0.51)
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Lightweight aggregate(l=0.34)
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Standard aircrete(l=0.16)
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Lightweight aircrete(l=0.11)
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100
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0.33
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0.32
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0.31
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0.28
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0.27
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85
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0.37
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0.36
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0.35
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0.32
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0.30
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75
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0.41
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0.39
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0.38
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0.35
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0.32
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65
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0.46
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0.44
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0.42
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0.38
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0.35
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50
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0.55
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0.52
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0.50
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0.44
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0.41
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NOTES - The U-values have been calculated assuming that all walls are lined with plasterboard on dabs. Block sizes assumed to be 440 x 215mm, mortar joints assumed to be 10mm wide, wall ties assumed to be stainless steel with a cross-sectional area of 12.5mm2 for 100mm side structural cavities and Ancon ST1 ties for larger cavities. The U-values have been calculated to BS EN ISO 6946: 1997.
System Advantages
- Upgrades clear cavities in existing dwellings
- Installed by approved contractor
- Low cost
- No fire stopping required in cavity
- Low system width
- Wall construction quicker than with built-in cavity wall insulation
- Injected after wall constructed, allowing empty cavity to be remedied
Installation
- Prior to commencing work, the suitability of the building as well as the location of flues and ventilation devices is determined. In addition, all under floor ventilation ducts and flues in cavity walls are checked and, if necessary, modified before the insulation can be injected.
- An approved cavity barrier is inserted as appropriate to isolate terraced or semi-detached properties and to close any open cavities.
- Following the instructions on the BBA certificate, a series of 25mm holes are drilled in a set pattern. In new build homes, these are drilled through the inner leaf, whereupon the insulation is installed before plastering. In existing buildings the holes are drilled from the outside through mortar joints, which are made good with pointing after the insulation has been injected.
- Instafibre blowing wool cavity wall insulation is injected into the cavity under air pressure from an approved blowing machine, through a flexible hose fitted with a tapered nozzle.
- The machine is fitted with a pressure sensor, which automatically cuts off to stop the flow of material when the area of wall being insulated is completely filled to the correct density. Vents, flues, etc are checked to ensure they are free from blockage.
Certification
Instafibre Yellow & White Blowing Wool is third party certified by the British Board of Agrément (cert no’s. 88/1976 & 89/2294 respectively)
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