Building Information Modelling (BIM)
BIM modelling is a process of creating an intelligent 3D CAD Model. Intelligent means that the model contains additional data such as size, material, service type, performance, cost etc. A pipe, for example, will not only be visually represented correctly in regards to size, the pipe will also know that it is for the LTHW system and contain invert level height and flow direction as well as many planning and buying attributes. BIM covers all aspects of a building. The architectural fabric, structural elements such as steel as well as the building services.
We use BIM Modelling as a tool for coordinating all the building services with each other and the building fabric.
BIM Models are used more and more frequently. A few years ago this process was limited to large construction projects where as now it is also being used in residential projects. Even though BIM is currently more common in larger residential housing projects it will soon become the standard for all construction projects.
Coordinated Drawings
Coordinated Drawings are a type of building services drawings that cover multiple services. All services require being coordinated with each other to assure a clash-free installation. Consultants drawings are usually up to RIBA Stage 3 or 4. This means (Stage 4) that the technical design is complete (i.e. pipe sizes and approx location specified) but the information is not fit for construction. Our job is to bring the drawings up to Stage 5, fit for construction. This requires all services to be installed in a manner that works with the building fabric as well as with other services. Coordination is not a simple CAD exercise, as good knowledge of the individual services is required to assure the performance specification is not compromised.
The Purpose of using BIM
BIM largely increases the productivity of a project by reducing rework and errors. The BIM Model is shared across all parties involved. This allows every discipline to design and plan their works virtually prior to construction commencing. Changes within the BIM model are excessively more cost-effective than changes on site.
Besides producing a design that works and a set of construction drawings, BIM Models are also used for visualisation.