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Thursday, 22 December 2011

Detailed Revit Modelling Guide & Work Flow for Beginners

One of my viewers asked recently to post the workflow that i follow, so here it is. Excuse the formatting, copying across from indesign to blogger didn't really work(but its all in there).

Comment please, i'd like to see what others think?

Last post for this year, Hope everyone has a nice break over the holidays.

Cheers

Peter


This is an example of a modelling guide that will start you off from the beginning tru design/planning to construction :
Preparation (2-3 Hours (Max))

  1. Prep Autocad files for importing, clean, explode, purge etc.
  2. Save Autocad files into the same import folder (near where the revit central file folder will be located  server)

Setup (1 Day (Max))
  1. Start new revit file base on the ‘Template’;
  2. Create Worksets, (apply list in Revit standards document);
  3. Save Central file (Naming convention per Revit standards document)
  4. Save Local file (Naming convention per Revit standards document);
  5. Create Levels (main plans), Enter elevation to create. Organise browser by applying ‘user’ parameter;
  6. Next step is to Import base Autocad Plan/Site plan (done in ground floor plan);
  7. Set Project North -vs- True North. Once finished delete Autocad file;
  8. Re-import Autocad file in project north view, Pin drawing;
  9. Set Extents, move elevations so that they are clearly around intended building/zone. Draw reference planes of out edges of building/zone, enter East elevation and drag the levels so that they start/stop on these reference planes, Repeat for the South elevation;
  10. Set Grids, Either trace from the Autocad file or draw new ones over the acad file;
  11. Now Import remaining Autocad files and move into correct location, using grid lines as the guides to help locate the plans properly (if you have no grids, reference planes must be drawn to help you align the different Autocad plans);
  12. Setup Working views (duplicate original levels) rename the ‘copy‘ view with your initials at the front of the level name, organise browser by applying ‘user’ parameter;
  13. The file is now ready to start modelling;


Modelling - Stage 1 (5 Days)
Building
  • External Walls, Using ‘place holder’ generic walls types, model in the basic external walls. (windows and curtain walls will come later, just enclose building to begin with);
  • Floors, Using ‘place holder’ generic floor types, model in the basic floor outline using the external walls as the boundary. (Floor finishes will come later, just the basic shape to begin with);
  • Roofs, Using ‘place holder’ generic roof types, model in the basic Roof outline using the external walls as the boundary. If it is a pitch roof type generally set the boundary 300mm from the outside edge of the external walls. Place a section in the model and move roof height into the correct location;
  • Columns, Using ‘place holder’ generic column types, place the main columns / structure, check the top of columns meet the correct floor slab or roof level above;
  • Internal Walls, Using ‘place holder’ generic wall types (usually 100, 140 or 200mm) model in the internal layout, trace autocad plan if available, check the top of walls meet the correct floor slab or roof level above;
  • Doors, Using ‘place holder’ generic door types, place the doors to each room in the model. Duplicate the basic door and create alternative sizes if the size you require is not in the template;
  • Rooms, Place rooms into the project and rename as you move around the plan. If it is a ‘repeating’ type project, when your placing the rooms you should select the room types from the drop down liston the ribbon, this activates all the predefined schedules and filters for the room data sheets in the template;
  • Windows / Curtain Walls, Generally all windows will be drawn as curtain walls to start off with as they are very flexible in their shape and divisions and do not require advanced window families to be available in the server library. We will generally use 100mm deep mullions for small windows and 150mm or 250mm deep mullions for shopfronts to begin with until we know actual size. The curtain wall type should be set to ‘automatically embed’ so it cuts its own shape out of the external walls;
  • Sweeps, profiles custom canopies, Add any extra features, gutter, reveals or profiles to the external walls and roofs. Canopies are usually a roof or floor with a special edge profile;
  • Ceilings, Place default ceiling height across the project using external walls and internal walls as the outline. If there are bulkheads, use a generic 50mm or 100mm wall type as vertical part of the bulkhead (if the bulkhead is curved us a custom sweep;
  • Furniture (this may be done after site plan works depending on the type of project, the deliverables requested and deadlines);
Site Plan
  • Toposurface, Model Toposurface by importing the survey Acad file, then place individual points over each level until the surface is built;
  • Roads, Define roads outside of the site by adding a ‘sub-region’ to the toposurface;
  • Building Pads, Cut the building shape and car park shape out of the toposurface by using Building Pads;
  • Car park surface, Place the car park surface by using generic floor types. Slope the car park by adding a ‘sloped arrow’ to the floor;
  • Car park components, Using the component tool place items such as car spaces, road marking signs, note the components should be hosted by the main slab (floor);
  • Walkways and custom road markings, These are created by modelling a 5mm floor type (usually white for marking, green for walkways). If the main car park surface is sloped you should copy the ‘sloped arrow’ from the main slab and paste it into the sketch of the walkway. Set the floor 5mm offset from level so it is above the main slab;
  • Kerbs, Model Kerbs or planter walls by using generic wall types usually 150mm or 215mm thick. Edit profile if required;
  • Grass/Planter, Model Grass/Planter areas with a generic floor type with grass finish;
  • Site furniture, place bollards, bins, benches etc. by placing components loaded from the library;
  • Site entourage, Add for rendering and visuals, place trees and cars to the site, note the entourage should be hosted by the main slab (floor);
The initial modelling stage is complete, now it is time to setup views for printing and perspectives for rendering;

Views and Annotation - Stage 1 (3 Days)
Plans
  • Setup Printing Views (duplicate original levels or working views) rename the copy with to the appropriate printing title, organise the browser by applying ‘01 Printing Views’ to ‘user’ parameter; 
  • Create and apply Scope box to view, Alternatively drag the crop region to desired extents;
  • Apply View Templates to plan views to get suitable graphics. If required change Visible Graphics (VG), Overwrite Elements in view or use the Linework Tool for visual clarity;
  • Annotate plan views with planning key notes, levels and dimensions as required;
  • For presentations Colour and Shadows are added to plan views. These are generally to be in addition to black and white plans;
Elevations
  • Place new Elevations/Elevation marker into the model if new elevation views are required. Rename with to the appropriate printing title, organise browser by applying ‘01 Printing Views’ to ‘user’ parameter;
  • Move elevation Extents and Depth to suit each elevation;
  • Apply View Templates to Elevation. Set shadows and sunlight to get suitable graphics. If required change Visible Graphics (VG), Overwrite Elements in view or use the Linework Tool for visual clarity;
  • Annotate Elevations views with planning key notes, spot elevations and dimensions as required. Use 2D entourage Detail Components such as planting and people to show more context;
  • For presentations Colour and Shadows are added to elevation views. These are generally to be in addition to black and white elevations;
Sections
  • Place new Sections into the model if new section views are required. Rename with to the appropriate printing title, organise browser by applying ‘01 Printing Views’ to ‘user’ parameter;
  • Move elevation Extents and Depth to suit each section;
  • Apply View Templates to section. If required change Visible Graphics (VG), Overwrite Elements in view or use the Linework Tool for visual clarity;
  • Annotate Sections views with planning key notes, spot elevations and dimensions as required. Use 2D entourage Detail Components such as planting and people to show more context;
  • For presentations Colour and Shadows are added to elevation views These are generally to be in addition to black and white elevations;
     
Site Plans
  • Duplicate (-without detailing) the floor plan. Change the cut level to show the roof plan if required;
  • Create and apply Scope box to view, Alternatively drag the crop region to desired extents;
  • Annotate plan views with planning key notes, levels and dimensions as required;
  • For presentations Colour and Shadows are added to plan views. These are generally to be in addition to black and white plans;
Create Sheets
  • Create New Sheets for each plan, section & elevation views. Title and number each sheet according to the  office standards;
  • Place Views onto sheets. For plan views turn on sheet grids in the properties and align each view to the same space;
  • Add keynotes, project notes and legends to sheets as required. Print and review drawings;
  • Print and Review
  • Print Sheets and review. Make changes and additions as required;
  • Issue drawings for design review or planning as needed;
  • At this stage the model should be backed up and recorded as a file separate from the ‘central file’ model;
Modelling - Stage 2 (20 Days)

- Develop Design

- Develop grid and pin it;

- Identify key sections, elevations and part plans. Create location plans and locate them as per TM-12;

- Detail and develop the fabric of the building, develop the structural scheme along side;

-Identify wall types, floor types and roof types needed in the project. Create these new type and number sensibly in line with standards document;

-Walls, Roofs and Floors that will become structural elements and eventually part of the structural model should be modelled separately. Eg. Lift cores, structural floor slabs. These element will be turned off later;

-Replace generic walls with developed wall types. Similarly this should be done for roofs;

-Floors should be separated into structural floors and architectural build ups. Floor finishes (except large finishes such as terrazzo or concrete screed) should not be included;

-Structural model should be developed by engineers and linked to model;

-Mechanical model should be developed by engineers and linked to model;

-Initial ceiling design should be settled, and Mechanical and Electrical object should be developed inconjunction with M+E engineers;

-Update curtain wall window glazing types to correct sizes of frames etc as the design develops;

-Model detail elements such as copings, flashings and cills as identified in sections where practical with wall sweeps and reveals.(Some finer detail will be done in 2D detail components later);

-The site layout should be checked: Updated wall locations and changing thicknesses can effect car parking spaces and clear widths;

-Where no consultant model is to be provided, link consultants Autocad information and update the model as required to show information eg. Condensate upstands etc.;

Views and Annotation - Stage 2 (15 Days)

-This is a general overview of the workflow for developing annotated drawings.

-Setup Printing Views (duplicate original levels or working views) rename the ‘copy’view with to the appropriate printing title, organise browser by applying ‘01 Printing Views’ to ‘user’ parameter;

-Create and apply Scope boxto view, Alternatively drag the crop region to desired extents;

-Apply View Templates to all views to get suitable graphics. If required change Visible Graphics (VG), Overwrite Elements in view or use the Linework Tool for visual clarity;

-Copy blank keynotes onto views. Print view and write down notes. Fill in the notes in the schedule view and place in correct location in the views as required;

-Use tags, dimensions, spot levels, keynotes, filled regions and detail components to annotate views;

-Use ‘Filled regions’ and detail lines to create site conditions over topography that does not show any buildup;

-Fill out and check schedules: door schedules, window schedules and room finish schedules in particular. Furniture schedules should be checked that the items on the schedule are activated properly;

-To accompany the door schedule elevations in drafting views should be created. These are done in drafting lines and 2D annotation. For jobs these can be copied from similar previous jobs\library;

-To accompany the curtain wall schedule, elevations of the glazing should be created. These elevations should be hidden at large scales;

-To accompany the Window and Louvre schedule, a legend view of the window blocks should be created;

-Generic details should be created in drafting views. These should be annotated and referenced in sections and plans. They should be placed on sheets;

-Sheets should be created and the views should be added to them. plans should be placed on sheets using sheet grid guides where possible. For sections and elevations the reference number should match that section number/letter;

-Schedules, legends, key notes, project risk notes should be added to each page;

-A construction legend should be created that references every element that are only described with automated tags. Also on this page there should be symbol legends, key notes legends and anything else that is referenced in the drawing set;

-Sheets should be printed, checked, reviewed and issued;


Backup Models and Revisions

Periodically the Revit model should be backed up at key stages as the model is always evolving and a past record models are difficult to keep with just 1 model. The stages the model should be backed up are
-Major concept design changes
-Planning
-Tender 1 (Information Issue before coordination with M&E)
-Tender 2 (Full Tender)
-Construction
-Any major changes at any workstage is probably worth a backup as well.

Process to backup the model.
-Detach Model from the Central Model
-Save new Model in the ‘Superseded models’ folder.
- The File name should have;
- Project Number, (09-077)
- Project Name (PMC House)
- Issue date (dd.mm.yy)
- Version (Work in Progress, Tender, Construction)
(00.000 Project Name - (Issue date) (Version))
Example (20.001 PMC House - (07.11.11)(Tender Issue))

5 comments:

S.C. said...

Very cool, similar to what I'm used to do. Except for the part of construction views and annotations Stage 2 that has not yet had the opportunity to do.

Greetings S.C. Portugal

J said...

Nice post.
You asked for it so here it goes... My comments are in no particular order,:

1) Never, ever, ever Import CAD, too dangerous. "Link" in every case. Better yet print

the CAD files and input into Revit only clean data based on dimensions since CAD

drawings are usually chock full of mistakes and not really straight lines, etc. STOP

RELYING ON CAD DRAFTED FILES FOR BEST RESULTS (OK a CAD file for

setting project base and for seeing survey files 'may' break that rule :-))!!!

2) Set initial Level size after extents are figured and adjusted, then make other levels

using the "pick lines' tool: that'll make levels fit better & easier, with less (or no)

adjusting later.

Place grids after this adjusting of extents and levels for best results as well.

3) Lose the dark background on your blog; it burns the light text into ones

eyes/brain and is unreadable... I only copy/paste into a word file to read your stuff

and I would read it more if it wasn't so annoying to look at. (FYI: I tried the dark

background for my blog and that lasted about 2 minutes)

4) Input Rooms into a Room Schedule prior to placing them into the model space for

best efficiency!!! Use Schedule keys to help pull info in as well. Standard rooms are

good to have built into templates for naming, color fill consistency, etc...

5) Hmmm I don't agree with the "Windows/Curtain Walls" concept but it is very

interesting, I like to start with proper object types, if they are known so less

manipulation/swapping later is needed but that's just me. I have seen too many

times when the CW instead of Wdow causes problems with 'some' users.

6) Standard Views, Sheets, Levels, Grids can be most effective if embedded into the

templates, that way it's a reductive process which can make for less re-creation of

the wheel on every project.

7) I also have several scope boxes in the templates that are adjusted when the

levels, extents & grids are finalized, then I apply that to all views as necessary.

8) F the linework tool if at all possible. Consistency goes right out the window with

object level overrides too and are avoided at all costs. See: http://cad-vs-

bim.blogspot.com/2010/10/are-revit-elevation-views-leaving-you.html for using filters

instead, it may supercede the linework and override needs.

9) Site and every other known type of plan/RCP/elevation/section, etc. should have

A] view ranges setup, B] VG & VT setups in the templates; so users just follow the

existing standards.

10) If there are oft used standard objects (walls, doors, floors, etc.) create these with

corresponding details and legends and schedules and sheets, then again we are not

re-creating things that should (or could) only be built once.

11) I recommend tagging assemblies & keynoting objects and materials: text is

good for non-object things only (like "open Beyond") ...User keynotes should be

used in extremely limited situations and should be swapped out after placement to

have a distinct keynote tag that has a different arrow so everyone knows it's a 'user

KN'

12) To hide elevations and sections for things like the accompanying images for

schedule sheets perhaps create different elev & sect tags and/or change their "hide

at scales courser than" parameter to full size or 6"=1'-0" so they are always off in

plans, elev's, sect's, etc. I also use this method for "USER" elev's and sections.

13) No warnings ever!!!!!!!!!!!!

-J

Free Webshop said...

Nice Guide and Description.

zaf said...

Very instructive workflow, but I cannot follow your blog since last year,don't know what happen. Did you stop posting ? I miss your class Sir.Hope everything is Ok.
Thanks

Anonymous said...

Nice summary
I would have added some topgraphic notes...where we are there is seldom a flat site..so dealing with contours and footing/pad levels is very important