Roof Design Drafting – Revit/AutoCAD?

They have the strangest names – gable, hip, jerkinheads, clerestory, noticed-tooth, witch’s hats, karahafu, mansard, rainbow, butterfly, satari and several far more. No, they’re not a listing of insect species. They are the names of distinctive styles of roofs. Even though the diverse types will need to be dealt with carefully for their complexity, even drafting the regular roof is generally acknowledged as 1 of the much more hard expertise to grasp in architectural structure drafting. Both Revit and AutoCAD are properly geared up to empower the delivery of these patterns roofs in household layout drawings, but for numerous, AutoCAD is edging just a small bit forward.

Appropriate from Stone Age periods, possessing a roof about our heads, or shelter, has been a single of life’s best priorities and a recognised human suitable. The models have arrive a long way from the rudimentary models of yore. So, how does it operate and what are the standard styles?

Roofs can be drafted on their personal or they can be developed as a consequence of placing them on a area that has been enclosed by a polyline or a set of walls. Once described, the proportions, slope, faces or edges can be modified. For additional intricate models, an ‘object’ is selected and modified until it is pretty much complete. For greater versatility on customising edges and other attributes, the roof can be transformed to slabs, to which quite a few details can be extra or improved, this kind of as orientation, angle, fascia and soffit profiles. These design facts can be included globally.

Other than the additional sophisticated types with the fancy names, standard varieties incorporate gable, hip, get rid of or flat. Low-cost and simple to construct, the sloped gable is the most popular type around the globe. Due to the fact of their slope, rain and snow are not retained and leakage is prevented, adding to its longevity. The ‘hip’ has slopes on 4 sides, encouraging it anchor the property beneath it. They are a lot less afflicted by potent winds and can be extra to a new household or to an existing house. A ‘shed’ features only just one sloping aircraft, which can have skylights or photo voltaic panels, increasing the possible for electricity effectiveness. ‘Flats’ are nearly totally horizontal with a slight slope for drainage, favourable for solar panels and price tag effective. There are also combos of gable, hip and other combinations.

So, how do AutoCAD and Revit fare in the procedure of roof style and design drafting?


AutoCAD program gives a wide variety of choices for developing and modifying a extensive variety of styles. In AutoCAD, options need to be cross-checked with elevations and ridges.

Commands in AutoCAD to produce distinctive styles are functional. They can be improved separately with improvements in height, slope, edges and the addition of dormer windows. A basic outline can be drawn as a polyline of a team of partitions, which can be transformed into a roof, so that the draftsman can focus on the outline 1st and modifications afterwards.

Flat and sloped kinds can be established with the very same approach, with a small rise selection and an overhang of ” established for the flat. Points on the inside of exterior walls are picked out so that the tops of the walls form parapets.

The ‘Properties’ palette can improve thickness, pitch and overhang.

AutoCAD’s ‘grips’ help editing in such a way that 2D objects, this sort of as lines, polylines and arcs, can be stretched, moved, rotated, scaled, copied or mirrored. Grips can also modify the edges and vertices, ridge factors, repair skipped intersections, transform the angle, rise or operate of slabs and can help make gables.

Resources can be defined. They can be shown in wireframes and functioning shade views.

Options of roof style and design drafting in AutoCAD incorporate:

  • Software Houses for an existing one
  • Altering proportions
  • Changing edges and faces
  • Converting slabs
  • Deciding on product
  • Deciding on screen properties
  • Deciding on hatching
  • Changing spot
  • Attaching hyperlinks, notes or documents


Designing a roof in Revit is noticeably distinctive from doing so in AutoCAD. Revit is deemed improved for significant-scale initiatives and has quite a few choices. Even though the device for elevation views and strategies are helpful, drafting sections and other information can be hard, specifically for common homes with sloped, canted, curved, cranked and customized-manufactured units. When making intricate roofs in Revit, it may well be preferable to build them as different models and then sign up for it to the other portion with the ‘join roof’ tool.

Usually, it may possibly not attraction aesthetically, and the edges may well not meet wherever they are expected to. This tends to come about since Revit attempts to develop slopes from the edges. The edges might not meet beautifully, and there are a number of approaches to counter this concern. One particular way is to create a mass, pick out mass faces and develop a roof. This could be challenging and lengthy, as a slope arrow ought to be applied to alter slope angle and slope path.

An additional alternative will involve shape editing resources. As soon as the traces are drawn, the default 3D perspective can enable the adjustment of the shape, the top and motion, but this way, it are not able to be joined to one more roof.

In Revit, a roof can be produced from: a developing footprint, as an extrusion, with sloped glazing or from a mass occasion, but it are not able to slice by means of doors or home windows, though trusses can be attached in the style and design.

Generating by footprint will involve:

  • 2D shut-loop sketches of the perimeter
  • Range of walls or draw lines from the approach check out
  • Closed loops for openings
  • Slope parameters for sketch strains

Creating by extrusion will involve:

  • An open up-loop sketch of the profile
  • Working with strains and arcs to sketch the profile in an elevation view
  • Editing the get the job done plane

Troubles with roof design and style drafting in Revit

  • When developing a hip with rafter design (for a vaulted ceiling), Revit does not automatically let for a ridge submit or other supporting factor to assistance the hip intersection.
  • Unique aspects of a style are put on the exact approach.
  • It is a lot more tough to edit.
  • With improvements in reference levels (eg. elevations), other proportions have to be modified also.

Comparing the roof structure drafting talents of each AutoCAD and Revit, customers come to feel that AutoCAD is easier to use because it:

  • Makes and modifies outlines with far more manage
  • Helps make it a lot easier to add aspects and solutions
  • Will make editing less difficult
  • Helps make drafting and documenting easier

Nonetheless, Revit modelling allows significantly less architecturally or technically skilled draftsmen to deliver additional sophisticated styles, whilst in AutoCAD, the precision and accuracy wholly depends on the capacity of the draftsman to appropriately interpret the style.

In the long run, though Revit and AutoCAD software have comprehensive resources for roof structure, it is the overall person-helpful technique of AutoCAD that household drafting products and services industry experts have located to be somewhat additional preferable.

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