Saturday, 31 July, 2021

Roof Design Drafting – Revit/AutoCAD?

They’ve the strangest names – gable, hip, jerkinheads, clerestory, saw-tooth, witch’s hats, karahafu, mansard, rainbow, butterfly, satari and lots of extra. No, they are not an inventory of insect species. They’re the names of various types of roofs. Although the various designs have to be dealt with fastidiously for his or her complexity, even drafting the normal roof is often acknowledged as one of many more difficult expertise to grasp in architectural design drafting. Each Revit and AutoCAD are properly geared up to allow the supply of those designs roofs in residential design drawings, however for a lot of, AutoCAD is edging just a bit bit forward.

Proper from Stone Age occasions, having a roof over our heads, or shelter, has been certainly one of life’s biggest priorities and a recognised human proper. The designs have come a great distance from the rudimentary designs of yore. So, how does it work and what are the essential designs?

Roofs might be drafted on their very own or they are often created on account of inserting them on an area that has been enclosed by a polyline or a set of partitions. As soon as outlined, the size, slope, faces or edges might be modified. For extra complicated designs, an ‘object’ is chosen and modified until it’s virtually full. For higher flexibility on customising edges and different options, the roof might be transformed to slabs, to which many particulars might be added or modified, resembling orientation, angle, fascia and soffit profiles. These design particulars might be added globally.

Apart from the extra complicated ones with the flowery names, primary sorts embody gable, hip, shed or flat. Cheap and straightforward to assemble, the sloped gable is the most typical kind worldwide. Due to their slope, rain and snow aren’t retained and leakage is prevented, including to its sturdiness. The ‘hip’ has slopes on 4 sides, serving to it anchor the house beneath it. They’re much less affected by sturdy winds and might be added to a brand new home or to an current house. A ‘shed’ options just one sloping aircraft, which may have skylights or solar panels, growing the potential for power effectivity. ‘Flats’ are virtually fully horizontal with a slight slope for drainage, beneficial for solar panels and price efficient. There are additionally combos of gable, hip and different combos.

So, how do AutoCAD and Revit fare within the strategy of roof design drafting?


AutoCAD software program presents quite a lot of choices for creating and modifying a variety of types. In AutoCAD, plans have to be cross-checked with elevations and ridges.

Instructions in AutoCAD to create completely different designs are versatile. They are often modified individually with modifications in top, slope, edges and the addition of dormer home windows. A easy define might be drawn as a polyline of a bunch of partitions, which might be transformed right into a roof, in order that the draftsman can think about the define first and modifications later.

Flat and sloped ones might be created with the identical course of, with a low rise quantity and an overhang of 0″ set for the flat. Factors on the within of exterior partitions are chosen in order that the tops of the partitions type parapets.

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

AutoCAD’s ‘grips’ allow enhancing in such a manner that 2D objects, resembling strains, polylines and arcs, might be stretched, moved, rotated, scaled, copied or mirrored. Grips may also change the sides and vertices, ridge factors, repair missed intersections, change the angle, rise or run of slabs and will help create gables.

Supplies might be outlined. They are often displayed in wireframes and dealing shade views.

Options of roof design drafting in AutoCAD embody:


  • Tool Properties for an current one
  • Altering dimensions
  • Altering edges and faces
  • Changing slabs
  • Choosing materials
  • Choosing show properties
  • Choosing hatching
  • Altering location
  • Attaching hyperlinks, notes or information



Designing a roof in Revit is significantly completely different from doing so in AutoCAD. Revit is deemed higher for large-scale tasks and has many choices. Although the tool for elevation views and plans are efficient, drafting sections and different particulars might be difficult, particularly for conventional homes with sloped, canted, curved, cranked and custom-made items. When creating complicated roofs in Revit, it might be preferable to create them as separate items after which be a part of it to the opposite part with the ‘be a part of roof’ tool.

Usually, it might not attraction aesthetically, and the sides could not meet the place they’re anticipated to. This tends to occur as a result of Revit tries to develop slopes from the sides. The sides could not meet completely, and there are a couple of methods to counter this difficulty. A technique is to create a mass, choose mass faces and create a roof. This might be difficult and prolonged, as a slope arrow have to be used to vary slope angle and slope course.

Another choice entails form enhancing instruments. As soon as the strains are drawn, the default 3D view can allow the adjustment of the form, the peak and motion, however this manner, it can’t be joined to a different roof.

In Revit, a roof might be created from: a constructing footprint, as an extrusion, with sloped glazing or from a mass occasion, but it surely can’t reduce by way of doorways or home windows, although trusses might be hooked up within the design.

Creating by footprint entails:


  • 2D closed-loop sketches of the perimeter
  • Number of partitions or draw strains from the plan view
  • Closed loops for openings
  • Slope parameters for sketch strains


Creating by extrusion entails:


  • An open-loop sketch of the profile
  • Utilizing strains and arcs to sketch the profile in an elevation view
  • Enhancing the work aircraft try this


Challenges with roof design drafting in Revit


  • When making a hip with rafter development (for a vaulted ceiling), Revit doesn’t mechanically permit for a ridge publish or different supporting aspect to assist the hip intersection.
  • Particular person parts of a design are positioned on the identical plan.
  • It’s tougher to edit.
  • With modifications in reference ranges (eg. elevations), different dimensions have to be modified additionally.


Evaluating the roof design drafting skills of each AutoCAD and Revit, customers really feel that AutoCAD is simpler to make use of as a result of it:


  • Creates and modifies outlines with extra control
  • Makes it simpler so as to add particulars and choices
  • Makes enhancing simpler
  • Makes drafting and documenting simpler


Nonetheless, Revit modelling permits much less architecturally or technically expert draftsmen to supply extra complicated designs, whereas in AutoCAD, the precision and accuracy wholly is dependent upon the power of the draftsman to accurately interpret the design.

In the end, although Revit and AutoCAD software program have in depth instruments for roof design, it’s the general user-friendly strategy of AutoCAD that residential drafting services professionals have discovered to be barely extra preferable.