Reading Roof Truss Drawings

Just remember the acronym.

Reading roof truss drawings.

Roof truss connection details a roof truss connection details b roof truss prop details str 08 december 2017 kachen details str 09 december 2017 december 2017 str 49 december 2017. Srr how to read a truss design drawing this four page document presents a generic truss design drawing with color coded explanations for every item of information contained therein. The roof truss structure and design is integral to roof structural integrity and shape. This stands for feet inches sixteenths.

428 roof plans existing ridge block 2 x 8 valley sleeper 2 x 8 ridge 2 x 8 valley sleeper existing trusses 24 o c. Read this drawings in conjunction with architects and other engineers drawings and specifications and such other written instructions as may be issued. Reading a mitek shop drawing 1 job name 2 truss label 3 truss type 4 truss quantity 5 number of plies 6 job description 7 software version. Truss design drawings from different suppliers are often laid out in different formats but they all contain the same basic information as outlined in the international building code section 2303 4 and the international residential code sections r502 11 for floors and r802 10 for roofs.

Example of truss shop drawing cut sheet. Reading a mitek engineering drawing 1 job name 2 truss label 3 truss type 4 truss quantity 5 number of plies 6 job description 7 software version 8a cumulated dimensions of top chord panel lengths are added together along the top chord of truss feet inches sixteenths. There are many types of roof trusses as wall as many types of roofs more types than there are parts. A truss design drawing usually contains the following geometrical information about the truss that it represents.

Roof truss span tables alpine engineered products 15 top chord 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 bottom chord 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2 12 24 24 33 27 27 37 31 31 43 33 33 46 2 5 12 29 29 39 33 33 45 37 38 52 39 40 55 3 12 34 34 46 37 39 53 40 44 60 43 46 64 3 5 12 39 39 53 41 44 61 44 50 65 47 52 70. Details of the truss bearings are specified on the truss design drawing. One of the first things that i questioned when asked to review truss shop drawings was how do i decipher these odd looking dimension strings. Figure 20 7 common roof pitches and angles angles shown are approximate and are to be used for drawing purposes only.

Truss design drawings have long been a source of confusion for contractors design professionals and building inspectors alike. This article and series of illustrated diagrams shows you all the parts of a basic roof truss king truss and queen truss. 12 truss height the height of the truss from the top of the bearing to the top of the top chord trusses with multiple. The answer is a convention of the truss producing industry.