2D Coordination
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2D Coordination And 3D BIM Coordination PowerPoint PPT Presentation

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2D Coordination And 3D BIM Coordination

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2D Coordination

2D Coordination And

This article is concerned with understanding 2D coordination as well as 3D coordination, before

comparing the two methods, to see the pros and the cons of each and to then help to determine

the preferred or the best method for modern construction and engineering.

2D coordination and 3D BIM coordination are concerned with ensuring the spatial coordination of

building services including HVAC, mechanical pipework, containment and plumbing. This means

that all of the building services are planned accordingly and spatially laid out both vertically and

horizontally within a ceiling void, or a riser, an underfloor void or a plant room.

The importance of spatial coordination cannot be underestimated as it provides the various trades

with accurate layout and installation information for building services in ceiling voids, risers, plant

areas, underfloor and also mid-level services. Correctly executed coordination will mean that there

are fewer clashes on site. This will then result in fewer delays, which can be costly and also delay

the project timescales.

There is also a need to include the architectural and structural elements within the coordination

activity. This means that when inserting building services in a drawing or in a model, the model

must also contain the building fabric and structural components, so that the building services do

not clash with the structure or the architecture as well as with the other services. It is important

for the structural and architectural information ideally in 3D models or in the worst case in 2D

format, to be available to the coordinator before he can start his work.

The architecture and structure being a part of the coordination consideration, the coordinator also

has a responsibility for ensuring that the building services installation takes into account all aspects

concerned with coordination, such as ease of installation, post installation access, manufacturing,

lagging, expansion and of course efficiency. Without taking into account such aspects, the building

services coordinated solution might or might not work or be efficient or easy. By taking in on

account this factor the coordination will be deemed as installation ready coordination, which can

be quite different to a standard coordinated solution.

In terms of approaching coordination, there are two methods, the first is 2D coordination, which

has been the traditional method used. The second method is 3D coordination, which has become

an evolving standard in the last few years and indeed the last decade.

2D coordination involves creating plan drawings as well as sections detailing the services layout for

HVAC, pipework, sprinkler, containment, plumbing and drainage. Typically, these are all added to

one drawing which is known as the coordinated building services drawing. Once the coordinated

drawing is approved then single service drawings which are also coordinated are provided. These

are more detailed single service drawings show the invert levels, dimensions and sizes. 2D

coordination relies on a good level of skill, both in terms of service knowledge and also software

knowledge from the user to avoid clashes on site. As 2D coordination is very difficult to check

quickly, the ability to check and approve the 2D coordinated drawings relies on the skills and

scrutiny of someone capable of interpreting and understanding the drawings. As a result of this,

coordinated drawings are often difficult to review and approve with any real assurance. This has

unfortunately resulted in problems which are not being identified until the installation on site had

been started.

With 3D coordination, the ability of a coordinator to produce an accurate and error-free model,

which will result in less clashes on site and therefore less delays and additional cost, is substantially

improved. In 3D coordination the user or users can work on an area providing or adding models for

ductwork, pipework, electrical containment and drainage to a virtual space which they can be

viewed in the virtual space to identify instant issues. As the coordinators are modelling into a

virtual space, which also includes the architecture and the structure the user is therefore also

taking into account the architectural and structural constraints as well as the constraints or the

routes of other services. The ability to then review the model and check for any clashes is improved

And 3D BIM Coordination

3D BIM Coordination

by using tools such as, Navisworks, which is a roaming, clash detection and interference analysis

tool. As well as the ability to review the model easily, the 3D output can also be used for design

review meetings and design approval and also to highlight potential issues to other parties. These

meetings would typically involve walkthroughs of the model and highlighting clashes and other

problem areas of the building services disciplines and for the other domains for the architect or

structural engineer. Added to this are all the ongoing benefits that the 3D model provides which

includes, the ability to use information from the model for installation maintenance in a facilities

management environment.

It is fair to assume that the 3D coordination method as an approach is considered to be an

improvement on the 2D coordinated approach. This is mainly because of the certainty that the 3D

coordinated approach provides to the installer or the contractor or the trade installing the services.

It is also true to say that 3D software and the 3D coordination process takes more time and costs

more money due to the software costs and also the skills involved in producing 3D models. However

when considering the benefits and reduced on-site construction timescales and costs, the overall

benefit of 3D coordination does outweigh the risks associated with 2D coordination.

3D BIM Coordination help to save time & money

3D BIM Coordination help to save time & money

The creation of MEP (M&E) coordination drawings is essential for design and development of MEP

(M&E) element, this include design of heating, ventilation, and air conditioning (HVAC), duct, pipe,

and electrical components. An MEP design must intertwine within an architect’s vision of a

building, so it is crucial to coordinate these systems accurately within the constraints of an

architect’s design.

The challenge for building design engineers is spatial coordination of the building services (MEP

elements). A trend, which is dwindling with time, is coordination completed using 2D plan sets

composed for each discipline. Unfortunately, this approach is often time consuming, expensive,

and can lead to a variety of mistakes including, clashes discovered during construction, repetitious

work, and project delays. Nowadays, MEP (M&E) design consultants are using BIM modeling services

and Revit 3D BIM modeling to design and coordinate multi-disciplinary work in a virtual, 3D

environment. BIM services identify and reduce the amount of early stage planning problems in the

design. Creating a collaborative BIM model allows all engineers involved to coordinate their design

with other disciplines; thus, reducing the number of design clashes and resulting in costs being

saved during installation.

3D BIM modeling services using Revit MEP are often used to coordinate MEP and architecture

related designs and plan sets. These services often include the use of Revit MEP programs because

the software allows for the accurate scale modeling of a project and its many intricate

components. The implementation of BIM modeling services for coordination improves clash

detection as compared to traditional 2D methods used. By creating a 3D model which can be used

for walkthroughs, owners and designers can avoid costly, last minute construction changes due to

building services, structural and architectural building clashes. BIM modeling manages the risk

during the design process by minimizing and significantly reducing constructability issues for the

MEP industry. Revit 3D BIM models also allow engineers to produce accurate MEP coordination

drawings as well as simplifying the process for quantity takeoffs, locations, scheduling, and


Using 3D BIM modeling services to create project models also reduces the need for requests for

information (RFI’s) and change orders during the construction process, because a working, easily

maneuverable 3D model is readily accessible to investigate and analyse before construction is

started. 3D BIM modeling has become a useful trend in the MEP and architecture industry, but these

models ultimately require a number of core team competencies to successfully and accurately

create a useful model.

To create an accurate BIM coordination model in 3D, appropriate software (such as, Revit MEP)

must be used to design, author and review the model. Expert knowledge and use of Revit MEP is

therefore required as well as domain related experience and knowledge by design team members.

A team that is unable to manipulate, navigate, and review a 3D model will not reduce project

costs, nor create an efficient construction model, or successfully maneuver through the many

project challenges that can (and will) arise. The use of tools such as Navisworks, a roaming tool

from Autodesk which also provides interference analysis reports, helps to achieve this aim at least.

The outcome of having a BIM modeling service team that is knowledgeable in their domain and

experienced in the use of the software will result in the creation of a model that is produced on a

3D environment that can easily be walked through, before the project is built physically. Use of a

3D BIM model will also reduce costs, improve construction efficiency, and increase estimate

accuracy when the model is used in the creation of quantity takeoffs, construction schedules, and

accurate estimates. The 3D BIM coordination model will also provide the owner and designers a

view of the project’s virtual construction; thus, highlighting project problems and avenues for cost


Ultimately, the use of BIM modeling services for project coordination reduces risk throughout the

construction process. For example, 3D BIM models allow MEP and architectural designers to zoom

in on problem areas and see a 3D representation of the free overhead allotted to certain pipes. 3D

BIM models also virtually allow designers to examine locations and means to re-route building

services through alternative locations within the project in order to improve efficiency during the

construction and building use phases. In some cases, a simple HVAC duct re-routing or re-location

chosen during model examination can save time and funds during construction. Sub-contractors

from all aspects of the design process can offer input regarding construction improvements. The

use of BIM services alongside MEP coordination drawings can also minimize waste onsite and reduce

the number of construction materials waiting for use on-site. Through use of 4D planning and

scheduling from the BIM model, materials can be brought to the site at an appropriate time due to

improved scheduling accuracy.

Instead of relying solely on traditional 2D MEP coordination drawings, many teams are relying on the

outputs from 3D BIM models which are based on accurate 3D models that are contributed and

approved by an entire design team. Ultimately, the use of BIM modeling services for coordination

has allowed for an accurate creation and examination of the project to be built thereby reducing the

number of mistakes and cost related issues that may have been experienced in a project designed in


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