Shown in red in our sketch, a common rafter runs at right angles to (90°) to the building front and back walls, as seen when looking down from above. What are the Names of the Different Types of Rafters?Īnd where are they found in which roof shapes or sections?ĭrawing adapted from Swanson's Book of Rafter Lengths and Roof Construction that was in turn copied in Empire Level Co.'s Rafter Square Instruction Manual both of which are cited below. Roof Framing Definitionsīelow we give the locations and functions of various roof framing members, rafter types, collar ties, rafter ties, ceiling joists, and structural ridge beams. We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest. Here we include sketches of collar ties, rafter ties, and structural ridge beams as well as illustrations of collapsing and collapsed structures where these roof rafter ties were lost or omitted. Without the proper support of rafter ties or a structural ridge, a typical gable or sloped roof will sag downwards while pushing the building walls outwards towards a catastrophe such as that shown in our page top photo of a barn in Amenia, NY: the failure of rafter ties in this building combined with snow loading in Amenia, New York, pushed the ridge down and the walls outwards as the building slowly settles down to the earth. This article series describes and illustrates the different types of support that prevents roof sagging and wall bulging at buildings, including definitions of collar ties, rafter ties, and structural ridge beams. Measure the width of the ridge beam: if you’re using a 2x4, it’ll measure 1.5 inches (3.8 cm). Roof structure definitions & support choices for sloped roofs, cantilevered roofs & cathedral ceiling roofs. The ridge beam is the vertical piece of plywood which will form the peak of the gable, and to which you’ll fasten the rafters on either sides. Roof Framing: collar ties, rafter ties, tension beams & structural ridge beams: some of these can support the roof and prevent ridge sagging and wall spreading. POST a QUESTION or COMMENT about roof framing, support, construction specifications & practices.Common rafter, Valley rafter, Valley jack rafter,Ĭollar Ties, Rafter Ties, Structural Ridge Beams
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |