Creating collars

Style

Select the collar style; flush collars or collar ties will only connect to the common rafters, joist collars connect to both common and jack rafters.

Joist: tie beam that rests on the bearing wall and overlaps the rafters

Flush Collar: tie collar that is flush to the rafters, usually attached to the rafters with metal plates

Collar Tie: tie collar that scabs onto the rafters and is attached with nails, bolts, and so on

Size

Specifies the collar size in width x height, in current file units. Sizes can be edited by selecting Edit List (see Custom frame element sizes).

Spacing

Select the collar spacing (Every Rafter, Every Other Rafter, and Every Third Rafter)

Location

For joist or collar tie styles, specifies the location of the collars in reference to the rafters. For flush collar style, the location is automatically set to Middle.

Middle places one collar at the center of the rafter for flush collar and joist styles, and one collar on each side of the rafter for the collar tie style.

Left/Right places a single collar on the designated side of the rafter for joist or collar tie styles. Joists and collar ties extend to the intersection of the rafter tops.

Elevation AFF

Specifies the elevation above finished floor of the bottom of the collars. If Flush Collar or Collar Tie is selected for Style, the default elevation is two-thirds of the roof height. Joist style is automatically set to 0.

Class

To control appearance and visibility, select a class from the list of classes present in the drawing or create a new class (see Creating classes)

Classes

Edits class attributes

Object Attributes

Specifies the collar attributes