How To Read Roof Truss Plans

If you think you d prefer an overhang style truss adjust the measurements for your top chords accordingly.

How to read roof truss plans. The answer is a convention of the truss producing industry. How to measure residential roof plans. Just remember the acronym. 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.

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. How to read roof truss planshow to how to read roof truss plans for i love animals. L d ratiothe ratio of the truss span l to its depth d both dimensions in inches. This stands for f eet i nches s ixteenths.

12 truss height the height of the truss from the top of the bearing to the top of the top chord trusses with multiple levels of top chord will have multiple truss height dimensions feet inches sixteenths 13 plate size orientation and type plate size in inches. So for example a dimension string that reads. In this drawing a 1 8 scale ruler is being used. Live loadany temporary applied load to a floor truss chord.

Avoid errors by taking the time to review your truss design drawings. The two lines denotes the direction of the plate. 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. On some roof trusses the 2 top chords extend down over the edges of the bottom chord creating a built in overhang.

4 7 12 would be the dimension 4 7 12 16 or 4 7 3 4. 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. Typically roof live load is snow while floor live loads are furniture human occupancy storage. 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.

Your top chords can protrude beyond the bottom chord anywhere from 1 3 feet 0 30 0 91 m. 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. Trusses may have symmetrical profiles but the loads they carry may not be symmetrical.