Strapping, bridging and blocking

Structure · Joists · printed page 54 (PDF page 55)

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Book index entries

Furnace – Joists Joists

Text in the illustration

strapping
cross-bridging
solid blocking
joists
all of these methods are commonly used to reduce joist twisting and rotating when the ceilings below are not finished
another benefit of bridging and blocking is that load sharing between joists and vibration damping are also improved
perspective

Generated explanation

A perspective drawing shows three parallel wood floor joists with strapping, cross-bridging, and solid blocking illustrated as methods of lateral restraint. Strapping runs across the undersides of the joists, while diagonal cross-bridging forms X-shaped braces between adjacent joists. Full-depth solid blocks fit between the joists, with fasteners shown through the joist faces at the block ends. The annotations explain that these methods reduce joist twisting and rotation when ceilings below are unfinished, and that bridging and blocking also improve load sharing and vibration damping.

Components

floor joists strapping cross-bridging solid blocking fasteners

Materials

wood metal fasteners

Related illustrations

0318

Strapping, bridging and blocking

· p. 53

A perspective drawing shows three parallel wood floor joists with examples of strapping, cross-bridging, and solid blocking. Strapping runs across the undersides of the joists, while diagonal cross-bridging forms X-shape