How to Draw a Truss Plan

Reference Number: KB-00933

Last Modified: March eleven, 2022

The information in this commodity applies to:

Chief Architect Premier Vertical Separator Home Designer Professional

QUESTION

How do I create an attic truss?

Attic truss detail

ANSWER

An attic truss is a type of roof truss with an open space at its bottom center to accommodate a living space, with webbing above and on either side of this living space.

In order to create an cranium truss, certain weather must be met in the plan:

The structure must be broad plenty and the roof steep enough to allow space for a loft area with attic rooms on either side of it. The loft area must accept Attic rooms on both sides and must be separated from these Attic rooms by Knee Walls.
The loft expanse cannot exist on Floor 0 or Floor 1 - information technology must have a living space beneath it that has a flat ceiling.
The roof must bear on the walls defining the floor below the loft surface area. It cannot touch knee walls.
Each side of the roof must exist equanimous of a unmarried roof aeroplane forming a continuous slope with a unmarried pitch from baseline to ridge.
The loft surface area must have a flat ceiling.

To create the structure

Considering attic trusses require specific conditions to be met earlier they can be created, we'll brainstorm past drawing a simple structure that meets those requirements.

Select File> New Program from the carte du jour to open a new, blank program.
Select Build> Wall> Straight Exterior Wall from the menu, then click and drag to describe a rectangular structure.
In this case, a construction measuring 40' x thirty' is used.
Using the Select Objects tool, click on the vertical wall on the left to select it and so click the Open Object edit push.
- On the Roof panel of the Wall Specification dialog, select Full Gable Wall and click OK.
- Repeat this footstep with the vertical wall on the correct, as well.
Notation: You tin can also apply the Modify to Gable Wall(due south) edit tool to convert hip walls to gable walls without having to open the Wall Specification dialog.
Select Build> Floor> Build New Flooring from the menu, and build a 2d floor based on the 1st flooring plan.
Select Build> Roof> Build Roof from the card, and on the Roof panel of the Build Roof dialog:
- Check the box abreast Build Roof Planes.
- Specify the Pitch of the roof to exist built. In this instance, a 12" in 12" pitch is used.
- Cheque the Trusses (no Birdsmouth) box.
- Check the Ignore Top (2nd) Floor box.
- Click OK to close the dialog and build the roof every bit specified. It volition bear on the height plates of the first flooring walls.
Discover the dashed lines that now display in the 2nd-flooring room area in a floor plan view. These are ceiling break lines, which represent the division between the flat, full height ceiling in the middle of the room and the low, sloped ceilings on either side. The area with the apartment, full top ceiling is loft area that will be accommodated by the open infinite at the center of your attic trusses.
Select Build> Wall> Straight Interior Wall from the carte du jour, then click and drag ii interior walls along the ceiling break lines.
- Information technology'southward easiest to draw them nearly the ceiling lines, then motion them into position afterwards they are drawn.
- If you desire, yous can create a custom wall type with sheetrock on just one side if the rooms with the low ceilings are to exist unfinished.
Select each of these two interior walls and click the Open Object edit button. On the Roof panel of the Wall Specification dialog, select Articulatio genus Wall to specify these walls as knee walls.
Side by side, using the Select Objects tool, click on ane of the rooms with a low, sloped ceiling and click the Open up Object edit button.
- On the Full general panel of the Room Specification dialog, select Attic from the Room Type drop-down list.
- Echo this step with the room on the other side of the loft area.

The conditions necessary to produce attic trusses are now in place.

To create an attic truss

Select Build> Framing> Roof Truss from the menu, so click and drag a line that is perpendicular to the ceiling break lines and runs from exterior wall to exterior wall.
The resulting truss volition automatically extend out to the eaves.

Note: A Message may appear asking "The layer "Framing, Roof Trusses" is not displayed. Do you want to plow on the display of this layer in the current view?" Click Yep to brandish the Roof Trusses layer in this view.
Select the roof truss and click the Open Object edit button. On the General console of the Roof Truss Specification dialog:
- Modify the Bottom Chord depth to match your floor construction depth for flooring 2. In this case, 11 7/8" will exist used.
- Check the Attic Truss box.
- Check the Force Truss Rebuild box.
- Click OK to close the dialog and employ your change.
  
  At this phase, y'all could also bank check the "Lock Truss Envelope And Webbing" box as well to foreclose the truss detail from changing if your roof is complete.
Make sure Temporary Dimensions are toggled on, enable the Select Objects tool, then click on the cranium truss to select it.
Click on a temporary dimension that shows how far the truss is from either finish wall, and type the distance that the commencement cranium truss should be from the wall.
In this case, the truss is placed 2' from the outside of the wall's framing.
With the truss still selected, click the Multiple Copy edit button.

Notation: Multiple Re-create is not available in Dwelling house Designer Pro. Instead, utilize the Transform/Replicate edit tool. As an example, if yous wanted to create 6 copies all separated a certain distance from each other, you would check the Copy box, set the Number of Copies to 6, and then check the choice for Motility and set the X Delta to be 24". Negative values tin also be set for each of the deltas if needed.
Click the Multiple Copy Interval secondary edit button to open the Multiple Copy dialog, specify the desired Principal Beginning for All Trusses, then click OK.
The Primary Offset is the interval at which trusses will exist replicated when Multiple Copy is used. In this example, the default value of 24" is used.
Hover over the chief Motility edit handle on the truss until you see the Multiple Copy cursor display, then click and drag across the construction, in the direction of the opposite stop wall.
- As y'all drag, the preview outlines of new trusses display at 24" intervals.
- When you lot release the mouse button, the new trusses are created.
Create a Framing Overview to meet the results.