Technical

Compression Members

There are many types of compression members in a typical building including: columns; top edges of beams; top edges of joists; wall studs; top chords and cantilevered bottom chords of wood trusses, and compression webs of trusses. the image below could easily be a line of wall studs; a row of truss top chords;[…]

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The Wind Exposure Factor

The Slope Factor (i.e. Slippery Roof Factor)   1995 NBCC 4.1.7.1(5) Conditions under which you can assume the roof is “Slippery” a.      the roof surface is “slippery” (i.e. steel, glass) and, b.      snow and ice can slide completely off the roof  Conditions under which you cannot assume the roof is “Slippery” a.      the roof surface[…]

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Verify Design Loads

When designing roof trusses or other structural elements, it is very important to determine the proper loads carried by the component.

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Partition Separation, Prevention and Solutions

Partition separation is cracking that develops between interior partition walls and ceiling or floor finishes, usually characterized by gaps opening in the winter and closing in the summer. To obtain and download further information in regards to this subject, Click here for more details.

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Standard Responsibilities in the Design Process Involving Metal Plate Connected Wood Trusses

The TPIC standard defines the design responsibilities of the individuals and organizations involved in the preparation, submittal, review and approval of each Truss Design Drawing and Truss Placement Plan associated with the use of metal plate connected wood trusses. These guidelines are presented as industry standard practice. The guidelines are not intended to preclude[…]

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Truss to Truss Connection

The plies of girder trusses must be connected together adequately to provide proper distribution of loads between plies. Nailing size and pattern used in two or more plies girder are shown on engineering drawings and in TPIC Design Manual Tables( B.1, B.1.2, B.1.3, B.1.4 and  B.1.5).   Attaching together 4 or more plies girder[…]

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Roof Trusses qualified under part 9 of NBC

Roof trusses for building of 3 stories or less in building height , having an area not exceeding 600 m2 (6000 ft2),  having a clear span between two bearing wall not exceeding 40 ft and used for major occupancies classified as a) Group C, residential occupancies such as: (Apartments),  (Boarding houses), (Club,[…]

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Corrosion Protection for metal connector plates

Metal connector plates used with chemically treated lumber, or used in unusual environmental condition, or exposed to weather, additional corrosion resistant protection for the metal connector plates shall be installed. Please refer to TPIC Appendix E1 located at www.tpic.ca

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Lumber Conditions at Manufacture

The service condition factor for the plates used in the design of roof trusses shall be according to the table shown below. Seasoned moisture content = or < 15% unseasoned moisture content > 15% 1.0 0.80

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