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On treated wood used for structural applications (joists, beams, posts), you’ll see fine incisions on the surface of the wood that allow for better preservative penetration. Incising is the process of piercing the surface of wood with small slits, before treatment, to allow more preservative to consistently penetrate beyond the surface of the wood. Incising improves protection and lengthens the service life of treated wood. It also helps to reduce surface splitting by decreasing the surface tension. Incising is required to meet treating penetration requirements to provide sufficient preservative performance of structural materials.

For more information on which products should be incised see the MicroPro Sienna Residential Treated Wood Use Category Guide.

Actual product colour may vary from colour shown in photos.
MicroPro Sienna Treated Wood products are produced by independently owned and operated wood preserving facilities.
MicroPro, MicroPro Sienna, and Cut-N-Seal are registered trademarks of Koppers Performance Chemicals Inc.

We’d like to thank you for your support of MicroPro Sienna, especially during these extraordinary times. Both COVID and recent consumer demand have put a strain on the supply chain. The wood industry has never seen anything like this. Due to the pandemic, many lumber mills and treating facilities across North America had to shut down or slow down production, but they are now cleared to get back up and running, while still prioritizing the health and safety of their teams. We are working diligently to produce more MicroPro Sienna and get it to your suppliers, but there will be delays and shortages for the foreseeable future as wood fibre remains in high demand throughout North America. We ask for your patience as MicroPro Sienna is replenished at building material stores across the country. Thank you.