Each method has its pros and cons. Here I will deal with method 1, which uses the old “Multistory Top Level” setting to create virtual upper levels.
Refer to a following post for method 2 (additional stair runs). In Method 3, Revit now allows spiral stairs to run around more than 360 degrees to create multistorey spirals.
|Taihang Mountains, China|
Creating Multistorey Stairs – Method 1This method is similar to the old (pre-2013) Revit method, but there are some subtle differences described in the process below:
- Create a typical one-storey stair; go to the stair properties
- Change the “Multistory Top Level” property from None to an upper level on the list. Assuming floor to floor heights are all equal, it will replicate the lower stair on the upper storey(s). With this method, the upper storeys must be the same heights as the lower ones; alternatively, if you have changed the stair Base or Top Offsets to something other than zero, then the Multistory Top Level needs to be a multiple of the "Desired Stair Height" shown in the properties.
- Note that it will not add the intermediate landings at each storey level – you need to do that yourself (see below)
- If the upper storey heights are different, you will probably get an error message. If you proceed it will store the warning with the stair and create intermediate storeys, but will not create the flights for the top level
- If the odd storey height is somewhere in the middle of the building, Revit does not build a reduced height stair like “Floor 7 ½ ” in the film Being John Malkovich
- Instead Revit gives a warning about that floor and keeps building the stair with flights at standard heights to match the original but stops short of the top.
- If the levels are changed so that all are matching, the stair will not adjust itself automatically, nor will the warning disappear – you need to manually reset the top storey level to get it to add the missing storey.
- Also, if the levels all start off equal and one is subsequently changed, Revit will not adjust the stair nor will it give an error message – it just won’t align the landings with levels. You can use this to your advantage if you want a multistorey stair to go up through a non-standard storey height but with standard run heights.
- (Hot Tip) In fact you can take this a step further (pun intended) by creating a special level just to control the top of your multistorey stair, and give that level an explicit name. The height of that level must be a multiple of the “Desired Stair Height” (typically the height between the lower two stair levels). It does not matter what other levels exist between the Top Offset and Multistorey Top Level
- Then change your stair properties to reach that Multistorey Top Level
- Once that is done you can move the special level out of harms way – it can even go below the lowest stair level underground. You must not delete the level otherwise the multistorey part will disappear – so it is a good idea to rename it to warn people not to remove it
- This method will eliminate the warning message for the stair, for those who have a zero tolerance policy for warnings.
Intermediate LandingsRevit will not add the intermediate storey landings for you
- You can go back into Edit mode to add a landing at the top of the defined stair by creating a sketch landing or by adding an extra run at the top, then deleting the run - the remaining landing will be converted to a sketch based component
- (refer to Landings for more detail)
- Once you complete the stair, you will notice a few very odd things happen
- The upper stairs will not join properly with the new intermediate landing
- This can be partially rectified by changing the run property “Extend Below Base” to a negative figure matching the landing thickness (it will also extend into the floor at the base); it won’t actually join the landing but at least it will be modelled correctly at the junction.
- Revit will also create railings all around the intermediate landings effectively blocking off the upper flights; it will also join the inner and outer railings into one element