Roof Design Drafting

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They have the strangest names – gable, hip, jerkinheads, clerestory, saw-tooth, witch’s hats, karahafu, mansard, rainbow, butterfly, satari and much more. No, they may not be a list of insect species. They are the names of styles of roofs. Though the diverse designs must be handled carefully for his or her complexity, even drafting the standard roof is normally acknowledged as significant challenging skills to get down in architectural design drafting. Both Revit and AutoCAD are equipped to allow the delivery of the designs roofs in residential design drawings, nevertheless for many, AutoCAD is edging a little bit ahead.

Right from Stone Age times, developing a roof over our heads, or shelter, is one of life’s greatest priorities and also a recognised human right. The designs have fallen a long way in the rudimentary designs of yore. So, how can it work and do you know the basic designs?

Roofs could be drafted automatically or they may be created caused by placing them on the space that is enclosed with a polyline or maybe a set of walls. Once defined, the size and style, slope, faces or edges may be modified. For more complicated designs, an ‘object’ is selected and modified till it really is almost complete. For greater flexibility on customising edges and also other features, the roof may be converted to slabs, in which many details might be added or changed, including orientation, angle, fascia and soffit profiles. These design details is usually added globally.

Other compared to the more complex ones with all the fancy names, basic types include gable, hip, shed or flat. Inexpensive as well as simple to construct, the sloped gable is regarded as the common type worldwide. Because of their slope, rain and snow usually are not retained and leakage is prevented, contributing to its durability. The ‘hip’ has slopes on four sides, helping it anchor the home beneath it. They are less impacted by strong winds and is usually added to a whole new home as well as to an existing house. A ‘shed’ features one sloping plane, which could have skylights or solar energy panels, helping the potential for energy efficiency. ‘Flats’ are almost completely horizontal that has a slight slope for drainage, favourable for solar energy panels and cost effective. There are also combinations of gable, hip along with other combinations.

So, how can AutoCAD and Revit fare in the act of roof design drafting?


AutoCAD software gives a variety of choices for creating and modifying an array of styles. In AutoCAD, plans should be cross-checked with elevations and ridges.

Commands in AutoCAD to produce different designs are versatile. They may be changed individually with alterations in height, slope, edges plus the addition of dormer windows. A simple outline is usually drawn to be a polyline of an group of walls, which could be converted into a roof, in order that the draftsman can discuss the outline first and modifications later.

Flat and sloped ones is usually created together with the same process, using a low rise number with an overhang of 0″ set for the flat. Points within exterior walls are chosen in order that the tops in the walls form parapets.

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

AutoCAD’s ‘grips’ enable editing in a way that 2D objects, like lines, polylines and arcs, could be stretched, moved, rotated, scaled, copied or mirrored. Grips may change the edges and vertices, ridge points, fix missed intersections, alter the angle, rise or run of slabs and may help create gables.

Materials may be defined. They is usually displayed in wireframes and dealing shade views.

Features of roof design drafting in AutoCAD include:

Tool Properties for a pre-existing one
Changing dimensions
Changing edges and faces
Converting slabs
Selecting material
Selecting display properties
Selecting hatching
Changing location
Attaching hyperlinks, notes or files


Designing a roof in Revit is considerably completely different from doing so in AutoCAD. Revit is deemed better for large-scale projects and has now many options. Though the tool for elevation views and plans are competent, drafting sections as well as other details may be challenging, specifically traditional houses with sloped, canted, curved, cranked and custom-made units. When creating complex roofs in Revit, it could be preferable to build them as separate units and join it for the other section with all the ‘join roof’ tool.

Typically, may well appeal aesthetically, plus the edges may well not meet where they may be expected to. This tends to happen because Revit attempts to develop slopes in the edges. The edges might not meet perfectly, where there are a few methods to counter this concern. One way is to build a mass, select mass faces and make a roof. This could be complicated and lengthy, to be a slope arrow need to be used to switch slope angle and slope direction.

Another option involves shape editing tools. Once the lines are drawn, the default 3D view can give the adjustment with the shape, the height and movement, but in this way, it can’t be joined to a new roof.

In Revit, a roof is usually created from: a building footprint, just as one extrusion, with sloped glazing or at a mass instance, but it wouldn’t cut through doors or windows, though trusses might be attached within the design.

Creating by footprint involves:

2D closed-loop sketches in the perimeter
Selection of walls or draw lines through the plan view
Closed loops for openings
Slope parameters for sketch lines

Creating by extrusion involves:

An open-loop sketch on the profile
Using lines and arcs to sketch the profile in a elevation view
Editing the job plane

Challenges with roof design drafting in Revit

When setting up a hip with rafter construction (to get a vaulted ceiling), Revit won’t automatically allow for any ridge post and other supporting element to compliment the hip intersection.
Individual elements of your design are positioned on the same plan.
It is much more difficult to edit.
With alterations in reference levels (eg. elevations), other dimensions has to be modified also.

Comparing the rooftop design drafting abilities of both AutoCAD and Revit, users think AutoCAD now is easier to use since it:

Creates and modifies outlines with increased control
Makes less complicated to add details and options
Makes editing easier
Makes drafting and documenting easier

However, Revit modelling enables less architecturally or technically skilled draftsmen to produce more technical designs, whereas in AutoCAD, the precision and accuracy wholly is determined by the ability on the draftsman to properly interpret the structure.

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