Metlifecare Gulf Rise, Silverdale

When Metlifecare specifies a product, that is the product that goes in.

Getting a substitution approved on a job like this is a slow process, and fairly so. Someone has to confirm the swap actually performs, the certifier has to accept it, and the developer has to agree. By the time that is done you have usually spent more than the substitution was ever going to save.

So the discipline starts at the quote, not on site. Price the specification correctly, order what is specified, and install what was ordered. Never substitute without approval. That sounds obvious written down. It is also one of the most common ways an insulation subcontractor creates a problem for a main contractor, because a cheaper equivalent looks harmless on a delivery docket and only becomes visible when somebody checks it against the spec, usually late.

Gulf Rise at Silverdale on the Hibiscus Coast was a two building delivery for Watts & Hughes at $350,000, on Metlifecare's programme. A mixed system: Pink Batts thermal, Autex Sound Solution acoustic, Kingspan K12 rigid board, and Autex soffit liner to the carpark, run to the same finished-product discipline we used at Elementum.

On the ground it ran like any other commercial site. The difficulty was not access or restrictions. It was coordination: keeping four systems moving through a live programme in the right order, with the right material on site for each of them, without any one falling behind the others.

The foreman ran a tight site and trust there was earned rather than given. That is a fair way to run a build of this size, and what earns it is straightforward enough. Turn up with the right product, in the right quantity, on the day you said you would, and do not ask for the specification to be relaxed because something is easier to get hold of.

Delivered on time, on programme, and signed off without rework.

We have written separately about why you cannot simply swap one insulation product for another inside a specified wall system, and what it costs when someone does.