Mc03 - Masonry cavity walls - Full fill with injected
glasswool
Advantages
- Low cost
- Installed by approved contractor
- BBA certification for all exposure zones
- Product guaranteed to resist moisture penetration
- Wall construction quicker than with built-in cavity wall
insulation
- Injected after wall constructed, allowing empty cavity to be
checked
- Supafil and Supafil 37 are Zero ODP Zero GWP insulation
products
- The manufacture of Supafil has a very low impact on the
environment
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Products
Supafil and Supafil Green 37
cavity wall insulation are loose glass mineral wool insulation
materials which are injected into existing or newly-built cavity
walls. They require no mixing on site and are dry when installed,
adding no water to the building. Their manufacture has a very low
impact on the environment and is classified as Zero ODP and Zero
GWP* Supafil and and Supafil Green cavity wall insulation are
available only through approved installers fully trained by Knauf
Insulation and approved by the British Board of Agrément. A list of
Approved Installers is available on request.
* Ecohomes and Code for Sustainable Homes
classification
Typical construction
Brick or block outer leaf (which may be rendered), cavity fully
filled with Supafil and Supafil Green cavity wall insulation, brick
or block inner leaf. Internal finish of plasterboard on dabs.
Tests by the British Board of Agrément confirm that Supafil and
and Supafil Green cavity wall insulation will not transmit water to
the inner leaf. Nor will it transmit moisture by capillary action
across the cavity or from below DPC level. Supafil and and Supafil
Green cavity wall insulation has negligible resistance to water
vapour, permitting the wall to breathe.
Guarantee
Knauf Insulation offers a 25 year comprehensive guarantee for
new build installations which also covers materials and
workmanship. For installation in existing domestic properties, the
Cavity Insulation Guarantee Agency (CIGA) offers a 25 year
guarantee covering both materials and workmanship.
Installation
A survey is carried out prior to installation to ascertain the
suitability of the building for insulation and to determine the
position of flues, air vents, etc. Essential ventilation openings
such as those providing combustion air or under floor ventilation,
and all flues in the cavity wall, are checked and sleeved, or
otherwise modified to prevent blockage by the insulation. An
approved cavity barrier is inserted as appropriate to isolate
terraced or semi-detached properties and to close any open
cavities. A series of 22 or 25mm diameter holes are drilled in
accordance with the patterns detailed by the British Board of
Agrément Certificate. For new build schemes, the holes are usually
drilled through the inner leaf and the insulant installed prior to
plastering. For existing buildings, holes are usually drilled
through the mortar joints in the outer leaf and are made good by
repointing with mortar to match the wall finish as closely as
possible.
Supafil and and Supafil Green cavity wall insulation is fed into
an approved blowing machine and injected into the cavity under air
pressure 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.
Specialised buildings
Knauf Insulation together with their Approved Installers have
considerable knowledge and practical experience of installing
Supafil and and Supafil Green cavity wall insulation in various
constructions such as: Cornish, BISF and other system-built houses.
Knauf Insulation will be pleased to advise on the suitability of
any building for insulation.
Performance
Supafil and and Supafil Green cavity wall insulation will not
deteriorate with age or settle, and will therefore remain effective
as an insulant for the life of the building.
The operations of all approved contractors are rigidly monitored
by Knauf Insulation and the British Board of Agrément in accordance
with the terms of the British Board of Agrément Certificate.
Thermal performance
Supafil cavity wall insulation has a thermal conductivity of
0.040 W/mK.
Supafil Green 37 cavity wall insulation has a thermal
conductivity of 0.037 W/mK.
Table 38 gives U-values for typical constructions insulated with
Supafil and Supafil Green cavity wall insulation.
Table 38: Typical U-values for
masonry cavity walls insulated with Supafil and Supafil Green
cavity wall insulation
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U-values (W/m2K) for brick outer
leaf/cavity/100mm block inner leaf, plasterboard on dabs |
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Insulation
Thickness
(mm)
|
Dense
block
( λ=1.13)
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Medium
block
( λ= 0.51)
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Lightweight
aggregate
( λ=0.34)
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Standard
aircrete
( λ=0.16)
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Lightweight
aircrete
( λ=0.11)
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| Supafil |
| 300 |
0.14 |
0.14 |
0.14 |
0.13 |
0.13 |
| 200 |
0.19 |
0.19 |
0.19 |
0.18 |
0.18 |
| 160 |
0.22 |
0.21 |
0.21 |
0.20 |
0.19 |
| 120 |
0.28 |
0.27 |
0.27 |
0.25 |
0.24 |
| 100 |
0.33 |
0.32 |
0.31 |
0.28 |
0.27 |
| 85 |
0.37 |
0.36 |
0.35 |
0.32 |
0.30 |
| 75 |
0.41 |
0.39 |
0.38 |
0.35 |
0.32 |
| 50 |
0.55 |
0.52 |
0.50 |
0.44 |
0.41 |
| Supafil Green 37 |
| 300 |
0.13 |
0.13 |
0.13 |
0.12 |
0.12 |
| 200 |
0.18 |
0.18 |
0.18 |
0.17 |
0.17 |
| 160 |
0.20 |
0.20 |
0.20 |
0.19 |
0.18 |
| 120 |
0.26 |
0.25 |
0.25 |
0.23 |
0.22 |
| 100 |
0.30 |
0.29 |
0.39 |
0.27 |
0.25 |
| 85 |
0.35 |
0.34 |
0.33 |
0.30 |
0.28 |
| 75 |
0.38 |
0.37 |
0.36 |
0.33 |
0.31 |
| 50 |
0.52 |
0.49 |
0.47 |
0.42 |
0.39 |
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 no
more than 12.5mm2 for structural cavities up to 175mm
wide and two part wall ties with a cross-sectional area of
60mm2 for larger cavities. The U-values have been
calculated to BS EN ISO 6946: 1997 and BR 443.
Fire performance
Supafil and Supafil Green cavity wall insulation is classified
as Euroclass A1 to BS EN ISO 13501-1. The installation of Supafil
cavity wall insulation will not adversely affect the fire rating of
the wall and will not constitute a toxic hazard in fire
conditions.
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Typical specification
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Supafil*/ Supafil Green cavity* wall isulation glass mineral
wool to be injected into the cavity by an Knauf Insulation/BBA
Approved Installer.
(*Delete as appropriate)
New cavity walls to receive Supafil cavity wall insulation by
injecting insulation into the cavity should be constructed so that
insulation cannot penetrate ventilation ducts or pass through to
cavities in adjoining buildings or compartments which are not to be
insulated. Close fitting ducts or sleeves should be installed
across the cavity to serve air bricks and other ventilation
openings. Cavity barriers should be installed at junctions with
other properties and compartments, and as required by the Building
Regulations.
Existing cavity walls to be inspected by the Approved Installer
and all necessary builder’s work carried out prior to Supafil
Cavity Wall Insulation being injected. All work to be in strict
accordance with the procedures laid out in the relevant BBA
Certificate and the Knauf Insulation “Operators” and “Survey &
Assessment” manuals.
Alternatively, refer to NBS clause: P11/40,220
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