A redline drawing is any drawing in engineering construction that shows the viewer changes that have been made on a previously approved drawing. Red lines can be done with a red ink pen or any other tool. For 3D designs, AutoCAD’s RevCloud is a perfect tool for making a redline. For the most part, redlines are made after the completion of a project phase.
Construction Sequence of RedLine Drawings
- The contractor prepares the design
- Client approved the design
- Contractor produces a drawing based on the design approved
- The contractor submits the drawing with revision numbers
- Client approves, disapproves or comments on the drawings
- Contractor modifies drawings based on client’s reaction and resubmits
- If the client approves the drawings, it will be marked as (AFC), Approved for Construction
- Once the AFC is received, construction work will start
- If there are changes with respect to the final design structure, the contractor shows the changes by drawing redlines
- The Contractor’ Quality Assurance team analyzes and approves the Redlines.
- Redline alteration is submitted to the Client for comments/approval
- A clean design copy with new alterations is produced by the contractor showing Client’s comments
- The final drawing will show revisions
- All designs rights are owned by the client at the end of the process
The sequence we provided is a common sequence used by many construction contractors, albeit with few alterations. However, the sequence doesn’t matter as much as the purpose.
Getting a structural design right the first time is not always possible, but making alterations with Redline drawings makes for a feasible design. With Redlines, an average viewer can spot the point of changes and also understand why the changes were made in the first place.
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