How To Read Roof Truss Plans

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How to read roof truss plans.

Trusses may have symmetrical profiles but the loads they carry may not be symmetrical. 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. Trusses that are mistakenly installed backwards or upside down cannot support the same amount of load as a correctly installed truss. 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.

How to measure residential roof plans. The two lines denotes the direction of the plate. The roof below is drawn in 1 8 scale this means that if using a regular tape measure that 1 inch would equal 8 feet. Your top chords can protrude beyond the bottom chord anywhere from 1 3 feet 0 30 0 91 m.

Installation details hanger schedule job information on center spacing and special truss locations are op tional information that may be included on the truss placement plan by the truss manufacturer. Truss design drawings have long been a source of confusion for contractors design professionals and building inspectors alike. In this drawing a 1 8 scale ruler is being used. How to read roof truss planshow to how to read roof truss plans for i love animals.

So for example a dimension string that reads. The answer is a convention of the truss producing industry. Live loadany temporary applied load to a floor truss chord. Avoid errors by taking the time to review your truss design drawings.

This stands for f eet i nches s ixteenths. The next thing to determine is the roof pitch see how to determine roof pitch the easiest and most accurate method to measuring a roof plan is to square everything off. If you think you d prefer an overhang style truss adjust the measurements for your top chords accordingly. Typically roof live load is snow while floor live loads are furniture human occupancy storage.

4 7 12 would be the dimension 4 7 12 16 or 4 7 3 4. On some roof trusses the 2 top chords extend down over the edges of the bottom chord creating a built in overhang. Just remember the acronym. The first thing to check is what scale the roof is drawn in.