Insulated Reveal
Windows reveals where the cavity is exposed can be a
huge source of energy loss in buildings. Polyfoam Closers help
prevent this problem.
Products
- Polyfoam System Closer comprises Polyfoam high performance,
100% ozone friendly, extruded polystyrene, rigid board insulation
semi-enclosed in a rigid PVC casing.
- Polyfoam Combi Closer is a variant of System Closer,
dimensioned to fit a range of cavity widths.
Typical Construction
Polyfoam System Closer and Polyfoam Combi Closer are located
between inner and outer leafs of masonry cavity walls at window and
door openings in place of the traditional blockwork return. The
Polyfoam closers fully fill the cavity and provides a damp proof
barrier between the inner and outer leaves.
The casing and the Polyfoam core are both highly moisture
resistant. The casing has a flexible strip attached to fit into the
rear of door and window frames to act as an extra damp proof seal.
Polyfoam System Closer is available in standard sizes to suit 50,
65, 75, 85 and 100mm cavity widths. Polyfoam Combi-Closer is
available in 75 and 100mm and can be adjusted on site to fit a
range of cavity widths.
Performance
Thermal performance
Polyfoam System Closer and Polyfoam Combi Closer have a thermal
conductivity of 0.030 W/mK and can easily achieve the requirements
of the Building Regulations for preventing thermal bridging at
openings.
Fire Performance
Polyfoam System Closer and Polyfoam Combi Closer contain a
flame retardant to inhibit localised ignition. When contained
within a cavity wall behind a plaster or similar finish they will
not prejudice the fire resistance of the wall.
Installation
The closers are simply cut to length with a normal hand saw.
Care should be taken to ensure a tight fit. The jamb closer should
overlap the sill closer and butt up to the underside of the
insulated lintel. Any off-cuts can be utilised by simply pushing
the insulating foam core upwards so that it protrudes from the end
of the plastic casing. The casing of another piece is then slid
over the insulating core, joining the two pieces together. The
ties, if used, are installed at 500mm centres and built in as work
proceeds. Alternatively, the flanges of the closer can be nailed in
position at about 450mm centres.
Advantages
- Easily meets Building Regulation requirements
- Robust product
- All offcuts can be utilised