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The Need For Ventilation

SIPS can be considerably more air-tight than conventional constructions, achieving air leakage rates as low as 0.08 air changes per hour at normal pressures.

It is widely accepted that healthy buildings require a minimum air leakage rate of 0.5 air changes per hour at normal pressures. This is typically achieved with conventional construction techniques, but may not be achieved with buildings constructed using SIPS when both wall and roof panels are combined.

Therefore additional ventilation may be a sensible and beneficial addition to a building constructed in SIPS.

The Building Regulations / Standards encourage architects and builders to ‘Build Tight, Ventilate Right’. This means controlled ventilation. Introducing controlled ventilation is considered good practice in energy efficiency terms.

Ventilation Options

Mechanical Ventilation (with Heat Recovery) Systems (MVHR).

These systems bring controlled volumes of fresh air into the building and exhaust controlled volumes of moisture laden or stale air to the outside. With the addition of heat recovery, these systems can recover heat from outgoing air to preheat the incoming air. This heat recovery can provide a large proportion of the heat required to keep a building at comfortable living temperatures.

NB It is the responsibility of the domestic scale mechanical ventilation with heat recovery systems supplier, for the specific sizing of the equipment and the environmental and improved indoor air quality advantages associated with their systems.

The addition of humidity control to the mechanical ventilation system can provide an environment in which dust mites cannot thrive. This may be of benefit to some asthma sufferers.

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RKS Design and Build Ltd.
PO Box 6043
CV21 9LE

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