Jabroof Classic Panel in a Warm Pitched Roof - Jablite

APPLICATION:
Roof insulation – warm pitched roof
Product: Jabroof Panel
Jabroof panel is specially designed to be incorporated into warm pitched-roof
constructions to provide a high level of insulation to meet the current Building
Regulations’ requirements. The panels are placed immediately below the roof covering
where they also insulate the rafters, thus avoiding cold-bridging; a layer of plasterboard
is fixed below the insulation to provide the necessary fire performance.
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Roof Insulation
Jabroof Panel
Jabroof panels provide insulation above
and between the rafters to give a warmroof
construction. Cold bridging at the
structural members is eliminated,
substantially reducing the risk of
condensation.
Easy to handle
Jabroof panels are manufactured from
expanded polystyrene (EPS) which is
lightweight and easy to handle.
Permanent
Jabroof Panels are rot-proof and durable
and will remain effective for the life of the
building.
Environment
Expanded polystyrene has been awarded
an A+ rating by the BRE’s Green Guide to
Specification.
Ventilation
Creating a warm-roof construction which
incorporates a breathable sarking
membrane removes the need for
ventilation of the roof void.
Rafter variations
Jabroof panels are available in a range of
sizes and edge-profile dimensions to suit
different rafter centres and thicknesses;
panels are also available with an offset
edge profile to suit double-lapped rafters.
Protection to services
Because Jabroof panels are positioned at
rafter level, the roof space remains warm,
providing thermal protection to water
services in the loft area.
Type
Jabroof panels are supplied as EPS 100 as
defined in BS EN 13163 – Reaction to Fire
Class E, containing a flame retardant
additive.
Dimensions
Standard size: length – 1200mm
width – to suit 600, 450 and 400mm
rafter centres.
Thickness: 65, 95, 145 and 190mm; other
thicknesses are available to order.
Edge profile rebated to suit nominal 38 or
50mm single- or double-lapped rafters.
Shape
The edge profile provides support for the
panel on the rafter and includes a recess
for the counter battens used to retain the
panel in position. Figure 26.1 shows the
profile dimensions.
Water-vapour transmission
Jabroof panel has a significant resistance
to the passage of water vapour, but
should not be regarded as a vapour-control
layer. However, in this application,
a vapour-control layer need only be
considered where the system is used
over areas of high humidity or high
water-vapour emissions.
Fire
A protective layer of plasterboard must be
provided to the underside of the rafters in
order to provide the necessary standard of
fire protection.
U-values
Table 26.1 shows the U-values achieved
based on various thicknesses of Jabroof
panel. The values given are based on a
k-value of 0.036W/mK for the insulation.
Their calculation complies with the
procedures contained in the ‘Conventions
for U-value calculations’ document.
For technical information 0870 444 8769 technical@jablite.co.uk