Performance in, system out
The most productive contractor's design portions state what the construction must achieve — fire, acoustic, structural, thermal — and leave the specialist to select and justify the tested system that achieves it.
The least productive specify a system and a performance that the system does not deliver, and then ask the specialist to warrant both.
Interfaces are the real scope
Where a lining meets a facade, or a partition meets a riser, two packages hold half a detail each. Naming an owner for each interface at tender stage is a small act of drafting that removes a disproportionate amount of later cost.
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Content required from Stanmore — Design House
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