Roof Framing: definition of types of rafters, definition of Collar Ties, Rafter Ties, Structural Ridge Beams, causes of roof collapse & wall spread.
How it Works: Collar and Rafter Ties - Fine Homebuilding
www.flickr.com/photos/internetarchivebookimages/tags/book... . are emplo3ed, and the situa-tions in Avhich they are placed. The principal timbers of a roof arethe following, but they are not all used in every roof: the tie-beams, wall-plates,
The Mathematics of Rafter and Collar Ties | Math Encounters Blog