Archives May 2017

As built drawings certification text

What is an as built drawing?

by Dave |May 23, 2017 |1 Comments | Blogs | , ,

As Built drawings document the completion of works and are an essential part of the contractor’s hand over manuals. As the need for documentation throughout the construction process increases so does the need for as built drawings and other drawings.

As Built drawings can also be called As Installed drawings, As Constructed drawings and As Executed drawings.

An As Built drawing documents the changes that have been made throughout the job and the changes that have been made since the last revision of drawings.

For example, in electrical drawings the design phase for a construction project the electrical circuits are named P1, P2 etc. (for power) and L1, L2 etc. (for lighting). On the as built drawings these circuit tags are changed to show the distribution board number and circuit breaker number that the lights (or power etc) are connected to.

For example: DB1 CB37

Another good example is that data outlets are numbered to the client’s requirements.

Sydney University uses a unique numbering system for the data network which shows the room that the cable is fed from, including rack number and port number of the patch panel. Then the room number that the outlet is located in and the number of the outlet in the room.

A typical data outlet tag in Sydney University looks like this. 524.1.23.147.21

These can be quite challenging to add to an as built.

There are several stages that drawings take through a project, here’s a few examples.

A project will start with several stages of design drawings however the first set that a contractor will usual see for the For Tender drawings which are used for quoting.

Once the builder has been awarded the contract they take the role of Prime Contractor and pick electrical, mechanical, hydraulic, fire and security contractors to complete the project.

The next set of drawings are the For-Construction drawings where most the design changes have been made and these drawings allowing the contractor to start work.

The next set of trade drawings that aren’t normally required are Shop Drawings, these are required when a builder wants to see any potential changes the contractor can see before work starts.

Then we come to the Revision changes (usually shown as R1, R2 etc.) which document any changes the client has requested or any issues that have been resolved during the construction phase.

The next step towards As Built or As Constructed drawings is the most neglected, the contractor’s mark ups.

Pens, pencil, highlighters, chewing gums, blood, a bit of electrical tape and Bob’s your Uncle. A true mark up is not complete unless it’s been kicked around the work van for a few weeks, and has a generous splash of coffee and smudge of meat pie with sauce.

 

The last and probably most important stage is the As Built, As Executed, As Installed or As Constructed drawings, these critters help the contractor get paid!!

The As Built drawings are included in the hand over manual which also covers the products used during the jobs, their specification sheet and maintenance details.

As Built drawings can take anything from 5 minutes to hundreds of hours depending on the size of the project.

As the need for more details are required many Australian projects are now being completed using Revit models. Revit allows the engineers, contractors and clients to view every facet on the job in 3D. With addition of programs like Navisworks clash detections allows any potential issues to be resolved before construction begins.

If you need any help with As Built drawings or any other revisions, please feel free to contact us at Drawable on (02) 9519 0000.

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Tradesman viewing trade drawings and electrical drawings

Types of trade drawings

by Dave |May 10, 2017 |4 Comments | Uncategorised | , ,

What are the different types of trade drawings completed throughout the stages of construction?

At Drawable we complete a number of different types of trade drawings depending on the stages of construction.

Trade drawings, sometimes referred to as technical drawings, are drawings or plans used by contractors, engineers and tradesmen that documents specific trade elements for construction. An example of a trade drawing is a drawing made for a plumber with unique symbols to show where all the water lines, sinks, faucets, tubs and toilets are to be located.

The type of trade drawing required depends on the stage of construction and the specific development requirements. Not all developments will require all types of trade drawings.

There are 5 main types of trade drawings completed by Drawable throughout the construction process:

  • Tender Drawings:

Tender Drawings are the first type of trade drawing completed during the construction process. They are the engineers vision for the project used for estimating/pricing the cost of the building to be.

These drawings convey a lot of information about the construction to enable the contractors who are quoting for the job to understand the project completely.

The detailed drawings include exact dimensions, specifications and positions of elements.

The contractors will use the Tender Drawings to create the Tender Package. A Tender Package normally consists of the detailed set of drawings as well as a specification document detailing materials, workmanship and required standards for the entire project.

  • For Approval Drawings:

After the tender stage the drawings become For Approval Drawings. The For Approval Drawings are checked by the client and any required amendments are completed.

These drawings are used to affirm that the contractor has correctly interpreted the overall requirements for the development.

The client will then approve and sign off on the drawings, preferably before the construction commences.

  • For Construction Drawings:

Once the For Approval Drawings are signed off they become the Construction Drawings. Construction Drawings are used by the contractors to complete the actual construction.

These drawings, just like the Tender Drawings, will still include all of the detailed and exact specifications which are required by the contractors to get the job done.

  • Revision Drawings:

During the construction process it may be necessary for changes to be completed on site. Revision drawings are completed to document the various changes completed throughout the construction.

A number of revisions may be required depending on how many changes are completed by the contractors.

If there are no changes during the construction process, Revision Drawings will not be required.

  • As Built Drawings:

As Built Drawings are the final set of trade drawing completed for the development project. These drawings are completed after the construction has been completed. They will document the final details of the construction including the exact dimensions, geometry and location of all elements of the work completed.

Depending on the project specifications set out during the tender process, As Built Drawings are not always required.

The As Built Drawings can be used as a record from which future changes and/or additions can be designed. They can also be used as a starting point for any future developments to the same building.