Description
Crown DriTherm Cavity Slabs are semi-rigid or rigid slabs of
non-combustible, glass mineral wool with a water-repellent
additive. They are 455mm wide to suit standard vertical wall tie
spacings, ensuring a closed joint with adjacent slabs.
Crown DriTherm Cavity Slabs have a special additive to make the
product water repellent and are produced in three grades:
- Crown DriTherm Cavity Slab has a thermal conductivity ranging
from 0.035 to 0.037 W/mK
- Crown DriTherm Cavity Slab 34 has a thermal conductivity of
0.034 W/mK
- Crown DriTherm Cavity Slab 32 has a thermal conductivity of
0.032 W/mK
Application
Crown DriTherm Cavity Slabs are for the thermal insulation of
masonry cavity external walls, either partially filling or fully
filling the cavity. They are approved for use in buildings up to
12m high in any exposure zone and for use in multi-storey
applications up to 25m in height.
Standards
Crown DriTherm Cavity Slabs are non-combustible inorganic glass
wool, defined as mineral wool in BS 3533: 1981 and are manufactured
in accordance with BSI Quality Assurance Standard BS EN ISO 9001:
2000.
Durability
Crown DriTherm Cavity Slabs are odourless, rot proof,
non-hygroscopic, do not sustain vermin and will not encourage the
growth of fungi, mould or bacteria.
Vapour Resistance
Crown DriTherm Cavity Slabs offer virtually no vapour
resistance, allowing water vapour to pass freely through the
slab.
Certification
Crown DriTherm Cavity Slab is certified by British Board of
Agrément Certificate 95/3212 which approves its use in buildings up
to 12m in height in any exposure zone, and in multi-storey
applications up to 25m in height.
Crown DriTherm Cavity Slabs have been used in many
buildings over 25m in height, including exposed coastal sites.
Approval can be sought from Knauf Insulation Ltd and the British
Board of Agrément for Crown DriTherm Cavity Slab’s use in buildings
over 25m high.
Guarantee
Crown DriTherm Cavity Slabs are guaranteed for 50 years to
resist the transmission of liquid water from the outer masonry leaf
to the inner masonry leaf in new external cavity walls and to have
a thermal conductivity of 0.032 to 0.037 W/mK at normal building
temperatures. Masonry includes bricks, blocks and dressed and
reconstituted stone. The guarantee is available by application from
Knauf Insulation Ltd.
Environmental
Crown DriTherm Cavity Slabs are free from CFCs, HCFCs and
any other material with ozone depletion potential in its
manufacture and content and represents no known threat to the
environment.
Crown DriTherm Cavity
Slab’s manufacture has a low impact on the environment and is
classified as Zero ODP and Zero GWP.
Moisture Resistance
Crown DriTherm Cavity Slabs contain a water repellent silicone
binder to ensure that no liquid water is able to pass through the
slab and reach the inner leaf of masonry.
Tests by the British Board of Agrément confirm that Crown
DriTherm Cavity Slabs will not transmit water to the inner leaf.
Nor will it transmit moisture by capillary action across the cavity
or from below DPC level.
Handling and Storage
Crown DriTherm Cavity Slabs are easy to handle and install,
being lightweight and easily cut to size.
They are supplied in polythene packs which are designed for
short term protection only. For longer term protection on site, the
product should either be stored indoors, or under cover and off the
ground. Installation instructions are on every pack.
Crown DriTherm Cavity Slabs should not be left permanently
exposed to the elements.
Product Data
Crown DriTherm Cavity Slab
| Thickness (mm) |
Thermal conductivity
(W/mK) |
Thermal resistance
(m2K/W) |
Slab Size (mm) |
Slabs per Pack |
Area per Pack
(m2) |
| 100 |
0.037 |
2.70 |
1200 x 455 |
12 |
6.55 |
| 85 |
0.037 |
2.25 |
1200 x 455 |
14 |
7.64 |
| 75 |
0.037 |
2.00 |
1200 x 455 |
16 |
8.74 |
| 65 |
0.037 |
1.75 |
1200 x 455 |
18 |
9.83 |
| 50 |
0.035 |
1.40 |
1200 x 455 |
18 |
9.83 |
All dimensions are nominal
Crown DriTherm Cavity Slab 34
| Thickness (mm) |
Thermal conductivity
(W/mK) |
Thermal resistance
(m2K/W) |
Slab Size (mm) |
Slabs per Pack |
Area per Pack
(m2) |
| 100 |
0.034 |
2.90 |
1200 x 455 |
8 |
4.37 |
| 85 |
0.034 |
2.50 |
1200 x 455 |
8 |
4.37 |
| 75 |
0.034 |
2.20 |
1200 x 455 |
10 |
5.46 |
| 65 |
0.034 |
1.90 |
1200 x 455 |
12 |
6.55 |
All dimensions are nominal
DriTherm Cavity Slab 32
| Thickness (mm) |
Thermal conductivity
(W/mK) |
Thermal resistance
(m2K/W) |
Slab Size (mm) |
Slabs per Pack |
Area per Pack
(m2) |
| 100 |
0.032 |
3.10 |
1200 x 455 |
6 |
3.28 |
| 85 |
0.032 |
2.65 |
1200 x 455 |
8 |
4.37 |
| 75 |
0.032 |
2.30 |
1200 x 455 |
8 |
4.37 |
| 65 |
0.032 |
2.00 |
1200 x 455 |
10 |
5.46 |
All dimensions are nominal