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Contractor Guide

Working with Massaranduba: Tips for Builders

Taming the Brazilian Redwood

Massaranduba rivals Ipe in density but possesses a much higher volumetric shrinkage rate. It is a powerhouse of a material that demands uncompromising adherence to installation protocols, particularly regarding moisture and fastening.

Recommended Tooling

Expect extreme wear on tools. Massaranduba (3,190 Janka) requires premium, heavy-duty carbide tooling. Fine-toothed blades may burn the wood; use a dedicated ripping blade for long cuts and a high-quality crosscut blade for ends.

Cutting & Routing

Feed rates must be slow and steady. The wood is so dense that it can cause kickback if forced. The fine, uniform grain usually cuts cleanly without tear-out, provided the blade is sharp. Always seal cuts immediately, as Massaranduba is highly prone to end-checking.

Pre-Drilling

Pre-drilling is absolutely required. Use cobalt bits and clear the hole frequently. The density of Massaranduba means that a bound bit will snap almost instantly. Do not attempt to force screws without a pilot hole.

Fastening

Because of its high shrinkage/expansion rate, face-screwing with two 316 stainless steel screws per joist intersection is the only recommended method, especially for 1x6 profiles. Hidden clip systems often fail to hold Massaranduba flat during significant humidity swings.

Health & Safety

The dust is extremely fine and can cause respiratory irritation. The wood is exceptionally heavy (65+ lbs/ft³), increasing the risk of muscle strain and fatigue. Practice safe lifting techniques and always use respiratory protection.

Pro Tips from the Field

  • Never skip or shorten the 14-21 day on-site acclimation period. Massaranduba must balance with the local environment before installation.
  • Do not install Massaranduba close to the ground. It requires minimum 18-24 inches of clearance and cross-ventilation underneath to prevent cupping.
  • In arid environments (like Colorado or Utah), surface checking is almost guaranteed. Inform the client that this is cosmetic.
  • Apply a penetrating oil immediately after installation to slow down moisture exchange and minimize checking.

Need Project-Specific Guidance?

Our hardwood experts are available to consult on tricky installations, material takeoffs, and custom milling requirements.