Solid Laminated Roof Diaphragm

The longest of the solid timbers were reinforced with laminated veneer lumber to ensure the roof s performance as an effective diaphragm.

Solid laminated roof diaphragm. Used in floor and roof applications panels are installed so the. Decking is also available in laminated wood. While he was at the potlach co. I am looking to space rafters at 72 however i cannot find any information on diaphragm strength of the t g decking.

A custom steel sculpted universal connector at the top of the glulam support columns was developed to accommodate the constantly varying roof geometry. Clt floor and roof systems are currently designed and built using clt as a diaphragm material in accordance with principles of engineering mechanics and provisions of the nds for connections and member design. I have a barely ledgible fax from 1997 still on the old thermal fax paper regarding the design of diaphragms using laminated timber decking. The roof diaphragm functions as a horizontal medium through which lateral forces are collected and redistributed to each participating vertical element wood frame shear walls.

Inherent is the assumption that the sheathing nail will have a penetration of not less than 10 diameters. Have to use a grade of lumber that is pressure treatable too and that means a lower allowable stress grade. They weigh less than concrete or steel so can also reduce foundation costs. Does anyone have experience using tongue and groove decking for roof sheathing.

While eight story cross laminated timber buildings exist in. The ibc icc 2003a and the af pa 2005 permit wood structural panel diaphragm sheathing to be fastened over solid lumber planking or laminated decking using full tabulated values for new construction. The above comments pertain to the forces parallel to the roof trusses. Just wondering if anyone has used this decking to act as the roof diaphragm.

Buildings that have primary wood frames with no lateral rigidity columns simply supported at top and bottom depend entirely on the diaphragm shear wall system for. Clt diaphragm connection and system performance with various connection details and loading conditions is an area of ongoing research. This project features a free form solid laminated wood roof site fabricated with 2 x 6 lumber in six foot wide panels and supported by 93 milled glulam columns and a two way cable truss system. Irc table r803 1 lists 1 1 2 t g for rafter spans up to 72.

It is designed of two to five strips of kiln dried wood glued with an exterior waterproof adhesive to form a glulam roof decking. A second layer of plywood sheathing was added to meet load transfer and drift requirements according to code.