Roof Components - Hip Rafters

With the selection list at the top of the dialog box you can choose existing settings. Using the disk icon you can save the current setting under the same name or a new name. Via the management icon you can create new settings, also by adopting existing settings, or modify or delete existing settings. See 'Save settings' in the 'General Help' manual.

Identification number: The material of the hip rafter is determined by the identification number. Using the switch at the end of the field, you can branch into the database and select a material.

Width: Width of the hip rafter.

Height: Height of the hip rafter. For the height a fixed value can be entered or it can be calculated based on the rafters. If you choose the option 'by rafters', the following fields will be enabled. There you can enter a rounding value and the cheek (schifter) height for both sides.

If double hip rafters are used, the height of the 1st (upper) hip rafter can also be calculated depending on the 2nd (lower) hip rafter. How the 2nd hip rafter is positioned can be seen in the helper images on the field 'Chamfer edges'. Depending on this position, the height of the 1st hip rafter is determined.

Rounding for height: If the hip rafter height is calculated based on the rafters, you can enter a rounding value here. The calculated height will then be rounded up to the next full value set here. Thus, a value of '0.02m' will always yield heights (cm) of: 10, 12, 14, 16, etc.

Birdsmouth height left: For the calculation 'by rafters' the program requires the cheek heights from the left and right sides of the hip rafter.

Birdsmouth height right: For the calculation 'by rafters' the program requires the cheek heights from the left and right sides of the hip rafter.

Base offset: There are different options for the base offset:

None: Even with unequal roof pitches the hip rafter is not shifted; it is installed centered on the hip line. The side faces then have different heights.

Chamfer heights equal: The hip rafter is shifted so that the chamfer heights of the hip rafter and thus the heights of the side faces are equal. If the hip rafter height is calculated based on the rafters, this basic shift will result in one of the two cheeks ending exactly at the underside of the hip rafter and the other cheek slightly higher (the hip rafter projects beyond the underside of the cheek).

Birdsmouth flush: The hip rafter is shifted so that both cheeks are flush with the underside of the hip rafter. The chamfer heights will then be different.

Value: The base offset can be freely controlled by entering a value.

Position: Position at which the hip rafter should be installed. Typically this is position 0, in which the rafters are also located.

Lower by: With this value the hip rafter can be lowered by the entered measure.

Width of the unchamfered surface: Here a width can be entered on which the hip rafter will not be chamfered. The hip rafter is not lowered for this; it retains its position. It will be lower by the corresponding measure.

Configuration of the hip rafter underside: The hip rafter underside can be straight or coved. The cove depth and the angles are generated automatically. If you calculate the hip rafter height from the rafters, set the rounding to 0.0 and the basic shift to 'cheeks flush', you will obtain a smooth transition between cheek and cove.

Ignore openings, hip rafter passes through opening: If this option is set to 'Yes', the hip rafter will ignore an opening that lies exactly on the hip line. The hip rafter will then not be separated. This is useful when the hip rafter should first be fully installed and only separated on site.

Rafter nail hole: A rafter nail hole can be created in two ways. It can simply be an annotation at the notch or it can create a dedicated drill hole. Normally the rafter nail hole is set on the purlin and all rafters, hip rafters, and valley rafters that receive a notch from that purlin also receive this rafter nail hole. In some cases a single component should receive a different rafter nail hole. Then you can give that component its own setting. Both options have different properties:

From purlin: The rafter nail drilling is taken from the purlin that creates the groove in the hip rafter. This can be a rafter nail drill as information at the groove or a separate rafter nail drill, depending on the setting at the purlin.

Rafter nail hole: Below this group you can choose a custom, detailed setting that then applies only to this hip rafter and "overrides" the setting at the purlin. If one of these options is selected, the rafter nail drilling will no longer be generated as information at the groove, but a separate drilling will be created that is also represented as such. Additionally, the rafter nail can be generated as well.

Hip rafter at left eave: For the connection of the hip rafters to an eave you can optionally set 'section' or '2 sections'. Which parameters are used for the selected processing can be viewed and changed via the switch at the right end of the field.

Hip rafter at right eave: Different settings can be made for the right and left sides of the hip rafter (as seen from the eave). Depending on the chosen settings, conflict situations can arise that result in different sections than expected. In such a case you should review the setting for the left and right sides.

Hip rafter at ridge: As soon as a hip rafter ends on a ridge line, it receives the connection set here. With the option '1 plumb cut' it is cut parallel to the ridge; with the option '2 plumb cuts' it is cut parallel to the ridge on one side and perpendicular to the ridge on the other side. Whenever multiple hip rafters meet at a point, they automatically intersect with each other in the contact area. The hip rafters automatically receive an air gap at the ridge if this is set under 'File - Settings - Limits, Processes'.

Hip rafter at roof kink: When a hip rafter ends at a roof kink, it receives one of the possible connections here. With the option '2 plumb cuts' the hip rafter is cut plumb at both kink lines. With the option 'Adjust' the hip rafter is adapted to the already existing other hip rafter. Therefore, the result depends on how that connecting hip rafter is configured.

Double hip rafter: A second hip rafter can be created beneath the normal hip rafter. Both hip rafters are positioned relative to each other. With the option 'centered' a second hip rafter is generated. This is automatically placed centered beneath the upper hip rafter.

Width: Width of the 2nd hip rafter.

Height: Height of the 2nd hip rafter.

Setback from building outline: Usually the 2nd hip rafter does not end at the eave like the upper one, but ends at the building contour or at a certain distance from it. This distance, relative to the building contour, can be entered here.

Chamfer edges: This option is only available if you have selected the option 'by 2nd hip r.' in the 'Height' field for the first hip rafter. The following options are available:

None: No edge of the hip rafter is chamfered. The hip rafter is pushed upward until the first edge rests on the underside of the rafter (depending on the rafter height entered above).

One-sided: At most one edge is chamfered. That means: with two equally pitched roof surfaces no edge is chamfered. The 2nd hip rafter is pushed upward until both edges of the hip rafter rest on the roof surfaces. With unequal roof pitches the hip rafter is pushed upward until the hip rafter edge on the shallower side rests on the underside of the rafters. The hip rafter edge on the steeper roof side is then chamfered accordingly.

Two-sided: At most two edges of the hip rafter are chamfered. With two equally pitched roof surfaces both edges are chamfered. With unequal roof pitches the hip rafter is pushed upward until the hip rafter edge on the shallower side rests on the underside of the rafters. The hip rafter edge on the steeper roof side is then chamfered accordingly.

After setting all values and options you can enter the hip rafters using the following switches:

All hip lines: The configured hip rafter will be generated on all hip lines.

Hip lines: The hip rafter will be generated on the hip line(s) that have been selected graphically.

Length-limited: Using two points the length and position of the hip rafter can be specified.