Fig 1 Isolation from masonry

Design for Durability - Isolation

Timber must be physically isolated from concrete or masonry as they can act as sources of moisture. Timber can be isolated by:

• Fastening the timber to the masonry or concrete by means of a metal bracket
• Providing a ventilated air space between timber and the moisture sources
• Installing a damp proof course (DPC) between the timber and masonry or concrete
• A combination of these systems.

Figure 1 illustrates several means by which timber may be isolated from potential moisture sources including concrete or masonry.

Reference: Timber Datafile P4 – Timber – Design for Durability of the NAFI Timber Manual.

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Timber Research Unit
Department of Architecture
University of Tasmania