Part
A “Structure”
The recently published Approved Document A (ADA) extended the consideration of disproportionate collapse to all buildings based on height and usage. Buildings are now rated as category 1, 2A, 2B or 3. Timber frame usage for categories 1 and 2 is now common place. Category 3 buildings are very unusual for timber frame.
Extensive testing at BRE Cardington as part of the TF2000 project demonstrated that timber framed construction
is very resistant to progressive collapse. Prestoplan has developed
a design and detailing philosophy which satisfies category 1, 2A & 2B requirements.
Indeed, Prestoplan has a unique history of successfully completing large
and medium rise projects. We were the first Company in the UK
to construct a frame at five storeys in height (Mannheim Quay) and have subsequently successfully delivered some of the largest timber frame schemes in Europe.
Prestoplan will consider all suitable projects up to seven storeys in height. As a guide we use 38 x 140 studs for external walls on all buildings (Refer Part L). On buildings up to and including four storeys 38 x 89 studs form the internal load bearing walls. On buildings above four storeys 38 x 140 studs are used on the internal load bearing walls and party walls remain as twin 89 walls. This represents a worthwhile space saving over masonry construction and avoids intrusive columns associated with RC and steel framed structures.
Download Typical Timber Frame Dimensions
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