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lumber and hanger products usually hold true. For example, 4xl4 dimensional lumber is actually about l3-l14" tall, whereas a 14" piece of laminated veneer lumber will be a full 14" tall.

More often than not, LVL comes in l-3l4" widths and is used in multiple laminations up to 4-plies. Therefore, it is common to see hangers for EWP widths of l-314", 3-112", 5-l/4", and 7". Common heights include 1-Il4', 9-1/4', 9-U2', tt-U4', rt-7t8', t4', 16', 18', and so on. Note that it's important to fasten multiple plies of LVL together properly, so consult the manufacturer' s instructions.

Shape

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l-lhave entered the mainstream of materials used for construction. As a natural extension of the advent and acceptance of EWP, hardware and connectors for such products have been successfully developed.

Many familiar connectors that have been used for decades on traditional dimension lumber have been adapted for use with EWP, but there are significant differences to keep in mind.

Sizes

The sizes of many EWP products differ from those traditionally available for dimensional lumber-and there are hangers available for almost any size. Height call-outs of these

The I-joist is a very efficient structural shape. The dry wood and side cavities make them light to handle, but also deserving of a few extra hanger considerations. Most notably, web stiffeners are required on the joists when used with hangers which don't directly support the top flange laterally. That's why hangers such as Simpson Strong-Tie's ITT, IUT, and IUS are extremely popular for use with I-joists. They are designed to laterally support the top flange, and therefore do not require web stiffener installation. This desisn saves the framer valuable time.

There are significant differences to keep in mind.

Fastener manufacturers work closely with EWP producers to ensure compatibility. "Double-shear" nail hangers, commonly used for solid, rectangular beams and joists, are not suitable to support I-joists.

Fasteners

Another feature that often differentiates EWP hangers from solid sawn hangers is the nail size. Most engineered lumber (rectangular) types have two different surface conditions. Often, the wide face has full veneers or larger strand pieces, and the narrow face has many glue lines. In other words, the strands and veneers are aligned so that their thin edges are visible on the narrow face. As it turns out, the nail spacing requirements are more restrictive on the narrow, glueline face since splitting can occur more frequently than on the wide face. Most of the major hanger manufacturers are aware of the differences on these two faces and allow for it in their hanger design.

While some of the heavy-duty solid sawn and glulam hangers use large, oversized nails, most heavy-duty hangers designed for EWP use l6d common nails as the largest fastener. (There are a few exceptions which have been deemed acceptable.) This design helps reduce splitting when nailing into the glue-line edge of engineered lumber or when nailing near the joint of multiple-ply LVL headers.

Some fastener manufacturers offer wall charts, such as Simpson StrongTie's free "Installation Guide for Composite Wood Products" (WCCWP0I), to make installation tips for many EWP hangers handy.

So, when you order hangers for use with composite lumber members, check for hangers that have the right size, shape, fasteners, and load capacity for the connection. They make yours and your builder customer's job easier and faster-and their structure stronger and safer.

- Information provided by Simpson Strong-Tie

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