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Nail Fatigue or Sickness

The rusting of nails set in timber battens causing the failure of the fixings.

Natural Ventilation

The free movement of air through a building, without mechanical assistance.

Newel Post

The main post that supports a staircase string or forms the central pillar of a spiral staircase.


Concrete made with only course aggregates and cement, there is no sand in the mix hence the name No-fines.


A short horizontal timber fixed between vertical studwork in a wall or between floor joists to strengthen and promote rigidity.


A rounded edge to a stair 'Tread' that overhangs the 'Riser'.