Page 6 - Architects Design and Installation Manual

Page | 6 Quick Facts
BBA Specification (cont.) ● Storage and handling requirements

● Design considerations

● Installation by a competent builder

3 Delivery and site handling
3.1 The panels are delivered to site in packs of 10, wrapped in polythene. A label bears the product and manufacturer’s
name, and the BBA identification mark incorporating the number of this Certificate.
3.2 Joining strips are packed in bundles of 12 and wrapped in polythene.
3.3 The backing boards should be stored flat.
3.4 The system components must be stored under cover and protected from direct sunlight, high temperatures and
mechanical damage.
3.5 The system components must not be allowed to come into direct contact with petrol, mineral oil, turpentine,
bituminous or similar products.
3.6 The system components must not be exposed to open flame or other ignition sources.
Assessment and Technical Investigations

The following is a summary of the assessment and technical investigations carried out on the SureCav Cavity Wall
Spacer System.
Design Considerations
4 Use
4.1 The SureCav Cavity Wall Spacer System is satisfactory for use in new external cavity wall constructions in domestic
and non-domestic buildings. The system ensures a minimum cavity width of 25 mm when using natural or reconstituted
stone outer leafs in conjunction with:
• conventional masonry inner leafs, with or without partial fill cavity wall insulation (masonry includes clay, calcium
silicate, concrete and stone units)
• timber-frame inner leaf.
4.2 The system may also be used with conventional clay and calcium silicate brick and concrete block outer leafs.
4.3 It is effective in maintaining a residual cavity width in new external cavity walls. However, it is essential that such
walls are designed and constructed to incorporate the normal precautions to prevent moisture penetration.
4.4 Buildings subject to national Building Regulations should be constructed in accordance with the relevant
recommendations of:
• BS 8000-3 : 2001 • BS EN 1996-1-1 : 2005, BS EN 1996-1-2 : 2005, BS EN 1996-2 : 2006 and BS EN 1996-3 : 2006 and
their respective UK National Annexes.
4.5 Where applicable, construction should be in accordance with the relevant clauses of NHBC Standards.
4.6 As with all cavity walls, the construction and detailing should comply with good practice as described in the
Standards given in section 4.4.
4.7 The system is restricted to a maximum height of 12 metres, where the 25 mm SureCav panels are used. However,
where the 50 mm SureCav panels are used, there is no height restriction.
4.8 The system can be used in any exposure zone, however, the use of the system does not preclude the need to apply
any external render coat or other suitable finish in severe exposure zones where such application would be normal
practice.
4.9 Other new buildings not subject to any of the above should also be built in accordance with the Standards identified
in 4.4.
5 Practicability of installation
The system is designed to be installed by a competent general builder, or a contractor, experienced with this type of
system.
6 Behaviour in relation to fire
6.1 The use of the system does not prejudice the fire resistance properties of the wall.
6.2 The requirements of the Building Regulations relating to fire spread in cavity walls can be met in buildings of all pur-
pose groups without the need for cavity barriers, provided the construction complies with the provisions detailed in:
England and Wales — Approved Document B, Volume 1, Diagram 13 and Volume 2, Diagram 34
Northern Ireland — Technical Booklet E, Diagram 4.5.