250x50 Merbau Step Tread 1.2m

Merbau stair treads, especially 1200mm long, are very strong due to Merbau's inherent hardwood density (F27 rated), natural rot/insect resistance, and high durability (Class 1), making them ideal for heavy use indoors or outdoors, but proper installation with strong fixings (like cup-head bolts) and sealing from all sides is crucial for longevity and to prevent cracking.
?br>Key Strength Factors
Hardwood Density: Merbau is a dense, hard timber, often graded F27, indicating excellent structural strength for bearing weight.

Durability: It has a Class 1 durability rating (above ground), meaning it resists decay and pests, ensuring a long lifespan for stairs.

Versatility: Strong enough for demanding applications like external stairs, decks, and even bushfire-prone areas (BAL29 rated).?br>Installation Considerations

Secure Fixings: Use cup-head bolts with nuts for primary fixing, not just coach screws from underneath, to avoid cracking the wood.

A 250x50 timber board is often gauged (planed) down to a 47mm thickness because it starts as a rough-sawn piece that is planed smooth to ensure consistent dimensions, squaring, and surface quality, losing approximately in the process.

Support:?/strong>For longer spans like 1200mm, ensure adequate support from stringers and consider potential flexing, especially with steel stringers.

Sealing: Seal all sides of the timber before installation to protect it from moisture, which prevents movement and stress.?br>
In summary, 1200mm Merbau treads are robust and suitable for most stair applications, but their performance relies heavily on correct, secure installation to handle foot traffic and environmental stresses.?/p>