Floor elevations and grids are called "datum elements" in Revit, which are reference objects for other components. They are different from the concepts in CAD. In Revit, both are 3D elements and both are unique. That is to say, the ④ axis seen in each floor plane and each vertical section is the same element. If the ④ axis is moved in a certain view, it will affect each view of the entire Revit document. It can be imagined that in a three-dimensional space, the elevation of each floor is a datum horizontal plane, and each axis represents a vertical datum plane. Starting from the Revit 2019 version, the 3D display of floor elevations is supported; the grid does not support 3D display. In the figure, the ④ axis must be set as the working plane before it can be displayed in the 3D view. Since the floor elevations and axes of other majors need to be consistent with those of the architectural major, the copy/monitor function of Revit is generally used to link the model of the architectural major, and then select its floor elevations and axes for copying/monitoring. Tip: For large-scale projects and multi-unit projects, it is recommended that elevations and axes be produced independently before collaborative design, so that each discipline can be individually linked and copied/monitored. At the beginning of modeling, generally set the floor elevation first and then draw the grid so that the grid range covers all floors by default. Of course, it can also be adjusted later. In order to avoid misoperation, the axis network must be locked after it is established.

Technical points of floor elevation:

Key points of axis network technology

Similar to walls, floors are also divided into architectural floors and structural floors. The former includes building surfaces, outdoor cladding, etc., while the latter, in addition to conventional structural floors, flat roofs and garage ramps are also generally made of floor slabs. (1) Distinguish between building floors and structural floors The distinction method is the same as that of walls. Whether the structural parameters are checked or not is used to determine whether the floor is a structural floor. The setting of the view filter is simpler. The floor type can directly set the filter conditions through the structural parameters. Of course, the classification in the example is not enough. For example, the bathroom sink tank filled floor, the basement roof backfilled earth floor, etc. all need to be set up separately. View filter To make a distinction. (2) Floor boundary Whether it is a building floor or a structural floor, most of them are connected to other components (structural beams, columns, walls, etc.), so the boundary setting of the floor has a great impact on the running speed. Many users like to make the floor slabs of the same height and thickness on a floor into one piece, which often slows down the editing speed in the later stage. It is recommended that the size of the floor boundary be controlled as much as possible, and multi-area boundaries be disabled. (3) The relationship between the floor, wall and room In the key points of wall modeling, we mentioned that the bottom of the infill wall should be flat on the top of the structural floor; the building floor slab should be sheared by the infill wall, so that the cross-sectional relationship is correct and consistent with the actual construction situation. The boundary of the floor slab can cover multiple rooms, or each room can have a separate floor slab. However, if there is a door on the wall, there will be a gap at the door, and the boundary still needs to be edited. ♀Tip: The only problem caused by this height relationship is that there will be two wires at the door opening. Because the door level is the floor level, which is higher than the bottom of the wall, there are two visible lines. We solved this problem by modifying the family. (4) Find the slope of the floor For drainage slopes with very small slopes, the floor slab can form a slope by editing sub-elements. Note that if you need to keep the bottom of the floor level and only find slopes on the top surface, you need to set one of the items to variable in the structural layer settings of the floor. After adding sub-elements, a sloped ridge appears on the surface of the floor. You can control the switch or line width through the inner edge of the sub-category of the floor in the w setting. Garage ramps are often made of floor slabs, and their editing freedom is higher than the ramp categories that come with Revit, and they are more flexible for turning, slope changes, etc. A turning lane, with a high degree of control over each key point through sub-primitives. (5)Floor opening There are generally two ways to create floor openings. One is to edit the floor boundary and leave the opening; the other is to use the "Building/Structure→Shaft" command to open the hole. The latter can set up multi-story shaft openings that pass through the floor slabs, ceilings, and roof components of multiple floors at the same time, and can set symbolic lines. This is a recommended approach for shafts with simultaneous openings on multiple floors to ensure that the upper and lower Openings are consistent between floors. Note that the tube well label still needs to be marked with additional text, or the rooms must be labeled by room. Shaft openings have no effect on linked files, i.e. slabs in linked files cannot be cut. However, you can see the shaft opening of the linked file itself, and you can also select and view its properties through the Tab key. If the architectural and structural majors are modeled separately, the openings must also be set separately, and check whether the two are consistent. doors and windows Doors and windows are all loadable families, and their modeling points are more dependent on the production of the family. When making enterprise prototypes, commonly used door and window styles need to be pre-made, which can be placed directly in the project. When other styles are needed, they can be made separately. Several points of attention related to the drawing expression of door and window families: (1) Make visibility settings for various entities. Components such as door handles and veneer panels should be set to only fine visibility, and the check boxes for planes and side elevations (i.e. "left/right view") should be unchecked. (2) Pay attention to plane expression. The two-dimensional expression of doors and windows does not come directly from the sectioning or projection of the model, but is expressed by drawing separate lines in the family, which must conform to the customary expression method. Especially for windows, for example, some design companies have If there are persistent requirements for "wire window" or "four-wire window", then corresponding settings must be made in the family. (3) Pay attention to facade expression. Opening methods such as casement doors and windows, sliding doors and windows must be expressed through detailed drawing lines. Tip: Revit's casement doors and windows cannot be distinguished from inwards and outwards openings by the dotted solid line of the facade opening line. If inward doors and windows are seen in the elevation section, they can only be processed manually through the "Line Processing" function.

A room is a primitive that divides the space in the architectural model based on the enclosed primitives (walls, structural columns, floors, roofs, and ceilings). These primitives are defined as room boundary primitives. Revit will refer to these room boundary primitives when calculating room perimeter, area, and volume and associate them with them in real time. The key points of room modeling are summarized as follows: (1) Room boundary The room boundary parameter of the bounding primitive can be enabled/disabled, if turned off the primitive will be ignored by room calculations. When the room boundary elements cannot be enclosed, or the same space needs to be divided into multiple rooms, you can use the "Building → Room Separation" command to manually divide the rooms and corridors around the atrium. When setting up the rooms, you need to manually draw along the atrium. A circle of room dividers, otherwise, there would be no way to leave the atrium opening. The room dividing line can be displayed through the view visibility setting switch, but the location is hidden deeper, under the "Model Category→Line" subcategory, not under the room category. Note that when Revit calculates a room, the ends of the wall or room divider do not necessarily need to be connected exactly, and a certain tolerance is allowed. There is a gap at the end of the wall in the target area. Within a certain range, Revit will ignore the gap and identify the boundary; when it exceeds 404.8mm, Revit will not ignore it. Revit allows finding components of linked files as boundaries, but the room boundary parameter should be checked in the type properties of the linked file. (2)Room height range The default height of a Revit room is 24384mm (8 feet), which needs to be modified manually (it can be set in batches for rooms on the same floor). In principle, it should be set by floor. Special rooms (such as tube wells) should be set up according to the actual height of the floor. (3) Room area calculation rules The room area calculation in Revit can be calculated based on the surface layer of the wall or the center of the wall. Generally, it is calculated to the surface layer of the wall, so that the net area of ​​the room is obtained. This setting is in the "Building→Rooms and Areas→Area and Volume Calculation" command.