Insulation for Ventilated Rainscreen Cladding Systems

Insulation
Third Issue
September 2010
Insulation for Ventilated Rainscreen
Cladding Systems
COMPLIANCE WITH APPROVED DOCUMENT B2
Low Energy Low Carbon Buildings
Insulation for Ventilated Rainscreen Systems
Four Steps to Compliance
This Technical Bulletin details the route
to compliance with Approved
Document B2 to the Building
Regulations for insulated rainscreen
cladding systems fixed to new and
existing steel framed or masonry walls.
The requirements differ for
constructions used in buildings:
●
less than 18 metres in height; and
●
18 metres or more in height.
Referring to Approved Document B2 Buildings other than dwellinghouses
(2006 edition), amended 2007, the
reader is directed as follows for
guidance given in relation to the
application of insulation materials:
Figure 1
Buildings less than 18 metres
in height with a non-combustible
substrate
Step 1
Please refer to Section 9 Table 13 Maximum Dimensions of cavities
in non-domestic buildings (Purpose
Group 2-7) (Figure 1).
Step 2
Please refer to Section 9 paragraph
9.3 Junctions and cavity closures
(Figure 2).
Figure 2
In addition, cavity barriers should be provided to close the
edge of cavities, including those around all openings. Cavity
barriers also need to be provided at the junction with an
internal wall or floor which is forming a fire resisting barrier.
N.B. Kingspan Kooltherm® K15 Rainscreen Board should not
be installed directly to steel framing.
For buldings less than 18 metres in height, as Kingspan
Kooltherm® K15 Rainscreen Board is classified by the Building
Regulations as being Class 0, it complies with the requirements
of Approved Document B2 if the maximum dimensions in any
direction between cavity barriers is 20 metres.
2
Buildings 18 metres or more
in height
The following relates only to storeys at
a height of 18 metres or greater.
Step 3
In addition to Steps 1 and 2, due to
the nature of the construction, please
refer to Section 12 paragraph 12.5
External wall construction (Figure 3).
Step 4
Refer to the guidance given in BR 135
for a building with a storey 18 metres
or more above ground level (Figure 4).
Figure 3
Figure 4
In addition, cavity barriers should be provided to close the edge
of cavities, including those around all openings. Cavity barriers
also need to be provided at the junction with an internal wall or
floor which is forming a fire resisting barrier. N.B. Kingspan
Kooltherm® K15 Rainscreen Board should not be installed
directly to steel framing.
For buldings of 18 metres or more in height, as Kingspan
Kooltherm® K15 Rainscreen Board meets the BR 135
performance criteria when tested to BS 8414-1: 2002 with
horizontal cavity barriers at a 3.5 metre vertical separation,
Kingspan Kooltherm® K15 Rainscreen Board complies with
the requirements of Approved Document B2 if installed on the
outside of a non-combustible substrate i.e. calcium silicate
board or masonry and the maximum vertical distance between
cavity barriers is 3.5 metres. In the event the floor spacing is
less than 3.5 metres cavity barriers should be provided at
every floor level.
3
Kingspan Kooltherm® K15 Rainscreen
Board is the first insulation board to
achieve LABC Type Approval as a
thermal insulation layer in rainscreen
cladding systems. It remains the only
insulation board that holds both BBA
Certification and LABC Type Approval.
Certificate No. 452-7-7194
LABC Type Approval is issued by one
local authority and is accepted by all
other local authorities throughout
England and Wales. LABC Type
Approvals cover compliance with
the Building Regulations and a register
of Approvals is kept by LABC to which
local authority building control officers
can refer.
This LABC Type Approval thus eases
the planning process for projects
incorporating Kingspan Kooltherm®
K15 Rainscreen Board, and applies in
all situations shown on Diagram 40 of
Approved Document B Volume 2,
including those parts of a building
more than 18m above
ground (Figure 5).
Kingspan Kooltherm® K15 Rainscreen
Board is a premium performance rigid
thermoset insulation board for use in
ventilated rainscreen cladding
systems.
Figure 5
For technical guidance please contact
the Kingspan Insulation Technical
Services Department (see rear cover).
4
Contact Details
Customer Service
Technical Advice / Design
For quotations, order placement and details of despatches please
contact the Kingspan Insulation Customer Service Department on
the numbers below:
Kingspan Insulation supports all of its products with a comprehensive
Technical Advisory Service for specifiers, stockists and contractors.
Tel:
+44 (0) 1544 388 601
Fax:
+44 (0) 1544 388 888
email: [email protected]
Literature & Samples
Kingspan Insulation produces a comprehensive range of technical
literature for specifiers, contractors, stockists and end users.
The literature contains clear ‘user friendly’ advice on typical
design; design considerations; thermal properties; sitework
and product data.
Available as a complete Design Manual or as individual product
brochures, Kingspan Insulation technical literature is an essential
specification tool. For copies please contact the Kingspan
Insulation Marketing Department on the numbers below:
Tel:
+44 (0) 1544 387 384
Fax:
+44 (0) 1544 387 484
email: [email protected]
This includes a computer–aided service designed to give fast,
accurate technical advice. Simply phone the Kingspan Insulation
Technical Service Department with your project specification.
Calculations can be carried out to provide U–values, condensation
/ dew point risk, required insulation thicknesses etc… Thereafter
any number of permutations can be provided to help you achieve
your desired targets.
The Kingspan Insulation Technical Service Department can also
give general application advice and advice on design detailing and
fixing etc... Site surveys are also undertaken as appropriate.
Please contact the Kingspan Insulation Technical Service
Department on the numbers below:
Tel:
+44 (0) 1544 387 382
Fax:
+44 (0) 1544 387 482
email: [email protected]
General Enquiries
For all other enquiries contact Kingspan Insulation on the
numbers below:
Tel:
+44 (0) 1544 388 601
Fax:
+44 (0) 1544 388 888
email: [email protected]
Tapered Roofing
For technical guidance, quotations, order placement and
details of despatches please contact the Kingspan Insulation
Tapered Roofing Department on the numbers below:
Tel:
+44 (0) 1544 387 383
Fax:
+44 (0) 1544 387 483
email: [email protected]
Kingspan Insulation Ltd. reserves the right to amend product specifications without prior notice.
Product thicknesses shown in this document should not be taken as being available ex–stock
and reference should be made to the current Kingspan Insulation price–list or advice sought
from Kingspan Insulation’s Customer Service Department (see above left). The information,
technical details and fixing instructions etc. included in this literature are given in good faith and
apply to uses described. Recommendations for use should be verified as to the suitability and
compliance with actual requirements, specifications and any applicable laws and regulations.
For other applications or conditions of use, Kingspan Insulation offers a Technical Advisory
Service (see above) the advice of which should be sought for uses of Kingspan Insulation
products that are not specifically described herein. Please check that your copy of the literature
is current by contacting the Kingspan Insulation Marketing Department (see left).
Kingspan Insulation Ltd is a member of:
The National Insulation Association (NIA)
Kingspan Insulation Ltd
Pembridge, Leominster, Herefordshire HR6 9LA, UK
www.insulation.kingspan.co.uk
®
Kingspan, Kooltherm and the Lion Device are Registered Trademarks of the Kingspan Group plc in the UK and other countries. All rights reserved.
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