Laminated bamboo (vertical and horizontal)

Overview

Laminated bamboo is made by splitting culms into strips, boiling and drying them, and gluing the strips into boards. It is a grass, not a tree, so it has no rings or heartwood, only a uniform, fine-textured look broken by nodes in some layups. Makers favour moso (Phyllostachys pubescens). People pick it for a clean modern look, hardness above most domestic hardwoods and a low price per square foot. For the denser pressed form see Strand-woven bamboo.

Pros

• Hard for the price. The Wood Database gives 1,410 to 1,610 lbf; Wikipedia's flooring page gives about 1,180 (carbonized, horizontal) to about 1,380 (natural). Compare red oak 1,290 and hard maple 1,450 on the same page.
• Cheap in flooring form: Angi puts horizontal at $3-6 and vertical at $4-10 per sq ft of material.
• Glues, stains and finishes well, per the Wood Database.
• Consistent stripe look with no knots or sapwood surprises.

Cons

• Silica (0.5 to 4.0% in the outer layers, per the Wood Database) dulls steel quickly. Use carbide.
• Perishable outdoors; the Wood Database notes rot and insect attack.
• Quality varies between makers. The Wood Database calls inconsistency across products its weakness.
• Carbonizing darkens the colour but significantly reduces hardness (Wikipedia). Most flooring uses urea-formaldehyde glue, though UF-free products exist.
• Engineered bamboo is not widely used for structural work because building standards are not agreed (Wikipedia).

Variants and subspecies

• Vertical grain: strips stood on edge, giving a fine linear stripe. Angi prices it above horizontal.
• Horizontal grain: strips laid flat, showing the nodes in a wide, pronounced pattern. Cheaper and slightly softer.
• Natural vs carbonized: natural is pale; carbonized (boiled or steamed under pressure) is amber to brown.
• Strand-woven: a separate, much harder product; see Strand-woven bamboo.
• Bamboo plywood: see Bamboo plywood.

Working and finishing

Treat it as a hard, abrasive hardwood. Use carbide blades and cutters, sharp bits and sandpaper rather than a plane, which the Wood Database says bamboo dulls. Taping across the line of a crosscut reduces tear-out. It glues well with ordinary wood glues; clamp pressure matters on the thin vertical strips. Expect to sand through any factory finish before restaining.

Staining and finishing colour

The Wood Database says bamboo stains and finishes well. The hard outer skin and uneven strip density mean pigment stains can look streaky, so always test on a scrap. Carbonized stock is already toned by heat, so you can darken it further but not lighten it.

Sustainability and handling

Bamboo is not CITES or IUCN listed (Wood Database). Maturity is quoted as two to three years (Wood Database) to three to five years (Wikipedia); Teragren says it harvests moso at 5.5 to 6 years, so sources disagree and harvest age matters for strength. The Wood Database notes that processed, glued imports are energy-intensive and can cost more than domestic hardwoods, and Wikipedia notes shipping from China adds embodied energy. We have not verified an embodied-carbon figure. The Wood Database reports skin irritation only rarely. Ask for FSC certification and a formaldehyde statement on the glue.

Popular projects

Floors are the main use. Woodworkers also make countertops, cutting boards, desktops, shelves, plant stands and cabinet doors, where the uniform stripe and hardness suit a modern look.

Buying notes

Sold as flooring (by the square foot) or as panels and boards from specialist dealers. A US dealer lists 3-ply cross-banded vertical-grain boards at $22 (1/2 in) and $25 (3/4 in) each in 9-1/4 or 11-1/2 in widths, which works out to roughly $16-18 per sq ft: well above flooring prices. Check the layup, glue and thickness, and avoid unbranded stock with no formaldehyde statement.