Thanks to one and all for the responses. Dwight was spot on though in pointing me in the right direction so thanks for this.
For others looking for the exact same solution as I was, here is an idiot proof breakdown of how I achieved it as it took quite some time to get it right. You could obviously change the spacing and line lengths to tweak the line to how you want it, but for me, I wanted to create a 5mm thick dashed line that was clearly visible at any scale without having to use the on-screen option ‘view true line weight’ which I feel makes it harder to see & draw accurately, particularly when there are multiple lines in close proximity (in response to your question Jared). When used on a 1:5 detail this line type looks like the attached image which is exactly the line type I wanted for my damp proof and breather membranes.
Set model space (floor plan) to a scale of 1:5
Then draw 39 horizontal solid lines, 8mm long at 0.05 vertical centres.
Select and copy these lines.
Open the ‘Line Types’ window.
Click on ‘New’.
Select ‘Symbol’, rename your line type and click ‘OK’.
Click the ‘Paste Line Components’ button to place the copied parallel lines into the box above.
Set the dash to 4 and the gap to 2.
Select ‘Scale with plan (model size)’ and then click ‘OK’.
Job done! This way, the line will appear to be exactly 5mm wide which is perfect for achieving nice clear looking detailing. Hope this helps people.
Cheers,
Paul
Paul Griggs BSc (Hons) MCIAT MCIOB
Chartered Architectural Technologist
AC23, i5 3570K Processor, 16gb RAM, NVidia 570GTX Graphics Card, 250gb SSD Drive