Fire / NCC Compliance

The Table below from NCC 2019 Building Code of Australia will explain the requirements for the Fire Resistance Level (FRL) of various building elements in Type C construction. If the external wall is 3 m or more from a fire source feature no special fire resistance is required. If between 1.5 to less than 3 m, the external wall must have an FRL of 60/60/60 (see table below). The FRL is measured from the outside, so timber is acceptable as long as the outer skin has an FRL of 60/60/60.

Internal Blackbutt Handrail

We would be cautious about wax or oil finishes for a handrail. Such finishes are inclined to become grubby with regular handling, particularly if you are considering a handrail for a commercial building. We suggest a satin grade floor varnish. That will bring out the natural colour of the wood and provide a hard-wearing finish that can be wiped clean when necessary.

Fixing timber floorboards

We weren't sure how the plywood is supported. If it's laid on a concrete slab and then battened to attach the floorboards, there should be a vapour barrier under the plywood. In that case the limited airspace shouldn't be a problem since the floor system will be protected against moisture from the slab. So nailing the boards would be adequate without gluing, as long as the battens are deep enough to accommodate the nails. If the battens are not deep enough to accommodate adequate nails, then gluing in addition to nailing may be necessary.

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