Truss design drawings have long been a source of confusion for contractors design professionals and building inspectors alike.
Reading roof truss drawings.
There are many types of roof trusses as wall as many types of roofs more types than there are parts.
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.
2 x 6 raft.
12 truss height the height of the truss from the top of the bearing to the top of the top chord trusses with multiple.
Details of the truss bearings are specified on the truss design drawing.
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.
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.
Read this drawings in conjunction with architects and other engineers drawings and specifications and such other written instructions as may be issued.
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.
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.
2 x 12 raft.
This stands for feet inches sixteenths.
Truss design drawings are a valuable.
This article and series of illustrated diagrams shows you all the parts of a basic roof truss king truss and queen truss.
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.
The answer is a convention of the truss producing industry.
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.
Figure 20 7 common roof pitches and angles angles shown are approximate and are to be used for drawing purposes only.
The roof truss structure and design is integral to roof structural integrity and shape.
