So, what actually are the BIM Level 2 deliverables?
Previously we have discussed the raft of standards and supporting documentation we have in the UK and I’ve told you that I think they’re pretty good. It is these standards and documents together that define what these deliverables are. We have been told that there will be an all-encompassing document summarising these, but in the meantime we can look at those standards and define pretty accurately what the deliverables are.
If you look at the graphic below you can see what the deliverable are:
You can see 3 different BIM originators each using their own software. There could be more (or less) but we have shown 3. They then check the work they have done – and they federate these models, coordinating and clash detecting. From these models, they produce what they’ve always produced – a set of 2D model contract documentation delivered in the form of PDFs. Documents retain a crucial importance in Level 2 deliverables and must be dealt with as part of your Level 2 deliverable story.
Of course, these 2D documents must be derived from a coordinated, federated, clash detected set of models. The CIC BIM protocol states that if there is a discrepancy between what is delivered in the form of the models and the 2D PDFs that it is the federated model data which is the primary data source. You cannot just do your 2D work and then deliver a model as well – the model has to be what is delivering the 2D output.
Alongside this, the Government is asking for COBie – this is the key differentiator between what is happening in the UK and the rest of the world. In the UK, we are the first country to define how we get to asset data that can be used throughout an asset’s lifecycle. We’ll delve further into COBie in coming weeks.
At the completion of each work stage, native software files are handed over to the client as a record of what has been done – and this must all sit within a common data environment – a system such as ‘Viewpoint For Projects’.
These deliverables for BIM Level 2 are really ‘starter BIM’ or ‘BIM 101’ – except for COBie – we’re not being asked to do too much, just author our models in 3D, federate them for better clash detected output so we get better 2D output and alongside that data for OM and FM throughout the assets lifecycle.
In the above graphic, on the left, you can see the standard deliverables that a contractor would be expected to do, and on the right, some of those which aren’t necessarily part of Level 2 BIM – somewhat surprisingly you’ll notice that 4D (timing against the elements of your model) and 5D (costing elements) do not form part of standard BIM Level 2 – but these are things that generally get done as standard by design and construction teams, so additional requirements maybe being placed upon the supply chains by contractors so they can produce good 4D and 5D information.