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IsoBoard Installation:
Cavity Wall Insulation
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Cavity Wall Insulation.
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IsoBoard Cavity Wall Insulation
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Cavity wall insulation will prevent heat transfer and build-up to the inner leaf of sun exposed walls. Moisture within the cavity is prevented from condensing onto and penetrating through the inner leaf when IsoBoard is installed.
The insulation restricts heat ingress to temperature controlled and passive cooled environments.
Generally in South Africa 30mm IsoBoard will be effective in dwellings and 40 / 50 mm in temperature controlled buildings.
Residential homes designed for comfort and energy efficiency.
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Cold storage applications.
Designs which function with minimum of mechanical cooling i.e.passive cooled building systems.
Agricultural, pharmaceutical, medical and commercial applications with temperature controlled environments requiring stable internal temperatures.
"ISOBoard® high density 32-36kg/m3 rigid extruded polystyrene 100% closed cell insulation board of …. mm thickness and 600mm width with shiplap (tongue and groove / butt-ended) joints fixed to inner skin of block cavity wall such as to shed moisture.
Galvanised mild steel once bent support and holdback ties size ........ mm girth with fishtailed ends built into horizontal joints in wall at maximum 600mm centres along top and bottom edges, including neatly notching board edges around wall ties, window and door frames."
Handle and install with care to prevent damage to board edges. Store boards flat within original packaging until required.
Boards are to be protected from adverse weather conditions and direct sunlight for the storage period.
IsoBoard is readily cut to length on site using a sharp blade or hack-saw to fit closely to door and window frames.
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Application Guide
Walls are constructed, leading with the initial 1.4m of inner leaf containing the first two rows of wall ties, spaced 600mm apart.
Space the cavity ties (to building code standards), with holding back ties in between, to be embedded as per building standards (see detail 1 & figure 2 at the bottom of this page).
Board support ties to be 2mm galvanised wire with fish-tail ends.
Excess mortar to be cleaned from the cavity face of the leading leaf.
The initial two rows of IsoBoard sheets are placed on edge against the leading leaf with shiplap joint installed such as to shed moisture away from the inner leaf, or with tongue facing upwards and secured with the holding back ties(see figure 2).
A run of boards may commence below a damp-proof course level to provide some edge insulation for the floor.
IsoBoard can be placed in a potentially damp position without losing thermal performance in the long term.
Construct the outer leaf taking care to keep the residual cavity clean and secure the cavity ties. Please note that the construction of a cavity wall with insulation requires competent supervision, to ensure that the cavity is cleaned and the cavity ties properly secured (see figure 3).
IsoBoard is readily trimmed on site using a sharp blade or hack-saw to neatly notch board edges around wall ties and fit snugly around window and door frames.
For this application boards in lengths of 2400mm are practical.
Order boards with shiplap or tongue and groove edge profiles with straight cut ends.
Consult your nearest IsoBoard sales office for advice concerning the appropriate thickness of IsoBoard required for your application.
Please click on the thumbnails below to see the detail on the schematics.
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