You should have finished Study Session 3 and Quick Quiz 3 before starting this Study Session.
The estimated completion time is 45 minutes.
Objectives
At the end of this study session, you should be able to:
At the end of this study session, you should be able to:
- Identify collar ties, knee walls and purlins.
- Describe the typical conditions encountered with collar ties, knee walls and purlins.
- Identify typical problems with collar ties, knee walls and purlins.
What can cause sagging of the top plate on a knee wall?
The top plate of a knee wall may sag if it is a single plate and if the studs are not lined up with the rafters above.
What is the difference between a knee wall and a purlin?
Knee walls and purlins both provide mid-point support for rafters. Knee walls provide their support by transferring the loads down to ceilings joists and walls or beams below. Purlins act as beams running along the underside of rafters.
What is the ideal location for a collar tie?
Collar ties should be located halfway up the rafters.
What is the main function of a collar tie?
Collar ties help prevent rafter sag.
What is the minimum roof slope required for collar ties to be effective?
4 in 12
Why is lateral support required on long collar ties and how might this support be provided?
Because collar ties are in compression, they might buckle. Lateral support helps to prevent buckling.
No comments:
Post a Comment