principal rafter

a diagonal member of a roof principal, usually forming part of a truss and supporting the purlins on which the common rafters rest. See diag. under king post.
[1655-65]

* * *


Universalium. 2010.

Look at other dictionaries:

  • principal rafter — noun : one of the upper diagonal members of a roof truss supporting the purlins and common rafters or those joints to which the roof boarding is secured see roof illustration * * * a diagonal member of a roof principal, usually forming part of a… …   Useful english dictionary

  • Rafter — This unusual surname recorded in the spellings of Rafter, Raftiss and Wrafter, is Irish. It seems to originate from the popular clan name of O Raferty, as it seems that in the registers of County Mayo, the spellings are quite interchangeable upto …   Surnames reference

  • principal — adj. & n. adj. 1 (usu. attrib.) first in rank or importance; chief (the principal town of the district). 2 main, leading (a principal cause of my success). 3 (of money) constituting the original sum invested or lent. n. 1 a head, ruler, or… …   Useful english dictionary

  • rafter dam — noun Etymology: rafter (I) : a dam formed by long horizontal timbers set at an angle to the banks and meeting in the center of the stream like the rafters of a roof principal …   Useful english dictionary

  • principal — adjective 1》 first in order of importance; main. 2》 denoting an original sum of money invested or lent. noun 1》 the most important or senior person in an organization or group.     ↘the head of a school or college.     ↘(in certain professions) a …   English new terms dictionary

  • principal —   a. chief; main; Finance, relating to a capital sum lent or invested; n. head, especially of a school, college, etc.; leading actor, singer or orchestral player;   Law, person for whom another acts as agent; person responsible for a crime;… …   Dictionary of difficult words

  • auxiliary rafter — noun : a rafter used to strengthen the principal rafter in a truss * * * 1. a rafter reinforcing a principal rafter. 2. a rafter reinforcing a diagonal member of a queen post truss. Also called cushion rafter …   Useful english dictionary

  • knee rafter — noun : a diagonal brace between a principal rafter and a tie beam * * * 1. a rafter for maintaining the angle between a principal rafter and a tie or collar beam. 2. a rafter bent downward at the lower end. Also called crook rafter. [1670 80] …   Useful english dictionary

  • auxiliary rafter — 1. a rafter reinforcing a principal rafter. 2. a rafter reinforcing a diagonal member of a queen post truss. Also called cushion rafter. * * * …   Universalium

  • knee rafter — 1. a rafter for maintaining the angle between a principal rafter and a tie or collar beam. 2. a rafter bent downward at the lower end. Also called crook rafter. [1670 80] * * * …   Universalium

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