How To Read Roof Truss Plans

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.

How to read roof truss plans.

Just remember the acronym. In this drawing a 1 8 scale ruler is being used. The first thing to check is what scale the roof is drawn in. 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.

Avoid errors by taking the time to review your truss design drawings. Trusses that are mistakenly installed backwards or upside down cannot support the same amount of load as a correctly installed truss. Trusses may have symmetrical profiles but the loads they carry may not be symmetrical. The answer is a convention of the truss producing industry.

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. Your top chords can protrude beyond the bottom chord anywhere from 1 3 feet 0 30 0 91 m. 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. 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. Truss technology in building how to read a truss placement plan a truss placement plan is a layout drawing identifying the assumed location for each truss based on the truss manufacturer s interpretation of the construction design documents. I don t know if it s the result of growing up as an only child but i am a complete sap for any creature with big eyes feathers scales or fins that needs a loving home.

L d ratiothe ratio of the truss span l to its depth d both dimensions in inches. How to measure residential roof plans. How to read roof truss planshow to how to read roof truss plans for i love animals. 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 below is drawn in 1 8 scale this means that if using a regular tape measure that 1 inch would equal 8 feet. So for example a dimension string that reads. The two lines denotes the direction of the plate. This stands for f eet i nches s ixteenths.