Fig 1


Fig 2


Fig 3


Fig 4


Fig 5

Flooring - criteria for improvement

There are a number of ways to improve the insulation of timber floors that help maintain heat above the floor and buffer heat loss to below the floor. These include:

• Eliminate excess moist air in the sub-floor space;
• Limit excessive air movement below the floor. Some ventilation below suspended timber floors is however essential;
• Install insulation in some form between the floor joists;
• Lay carpet. This is further improved by the use of a good carpet underlay; and
• Install a ceiling below suspended timber floors.

Floor insulation can take a number of forms.

1. Insulation supported on wire mesh run over (see Fig.1) or fixed to the underside of floor joists. (see Fig.2)
2. Insulation supported on a ceiling addition to the underside of the joists. (see Fig.3)
3. Perforated foil insulation run over the floor joists prior to laying the flooring. (see Fig.4) and
4. Folded foil insulation fixed between the joists.(see Fig.5)

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Timber Research Unit
Department of Architecture
University of Tasmania