Specifications & Approvals

HiLine Treated wood uses MicroPro® preservative technology, a waterborne, micronized copper azole (MCA) system developed to provide long-term protection for wood exposed in exterior applications from fungal decay and termite attack. HiLine Treated wood can be used in residential applications (decks, fences, freshwater docks and landscaping) above ground, in ground contact and in freshwater contact.

Accepted and Standardized Preservative of The Canadian Standards Association (CSA) as specified in the National Building Code of Canada

CSA Use Categories Ground Contact Use: UC4.1 Above Ground Use: UC1, UC2, UC3.1, UC3.2

MicroPro Sienna treated wood products are produced by members of Wood Preservation Canada (WPC) in Canadian Wood Preservation Certification Authority (CWPCA) certified wood treating facilities.

The CWPCA ensures that certified plants respect and fulfill the demands and requirements outlined by Environment Canada’s Technical Recommendations Document for the Design and Operation of Wood Preservation Facilities (TRD).

Follow the safe practices listed here when working with pressure-treated wood. Specific work practices may vary depending on the environment and safety requirements of individual jobs.

Category	Size (final)	Deterioration	Structural	Treatment	Incised	Examples
UC 3.2 A	Thickness 25mm or less	Low	Non-structural	Above-ground		Fence boards, lattice
UC 3.2 B Turned & profiled products	Thickness ≥ 25mm but ≤ 40mm	Moderate	Non-structural	Above-ground		Turned products spindles, handrails, 5/4 decking
UC 3.2 B Nominal 2″	Width < 150mm	Moderate	Non-structural	Above-ground		Deck boards, fence rails
UC 3.2 C	Thickness < 40mm	Moderate	Structural	Above-ground		Joists, beams
UC 4.1 D Nominal 2″	Thickness < 40mm	High	Structural	Ground, freshwater contact		Joists, beams
UC 4.1 D Squares	Thickness > 40mm and < 155mm	High	Structural	Ground, freshwater contact		Posts, freshwater docks, landscaping

Above Ground

	Application	Use Category*	Incised**
1	Fence Boards	UC 3.2 A
2	Lattice	UC 3.2 A
3	Railings Components	UC 3.2 B
4	Decking	UC 3.2 B
5	Ledger Boards	UC 3.2 C
6	Joists	UC 3.2 C
7	Beams	UC 3.2 C
8	Stair Stringers	UC 3.2 C

Ground Contact

	Application	Use Category*	Incised**
9	Post Supports	UC 4.1 D
10	Fence Posts	UC 4.1 D
11	Gazebo (joists, beams)	UC 4.1 D
12	Planter Boxes	UC 4.1 D
13	Raised Garden Beds	UC 4.1 D
14	Walkway (substructure)	UC 4.1 D
15	Retaining Walls	UC 4.1 D
16	Freshwater Dock Post	UC 4.1 D
17	Freshwater Docks (joists, beams)	UC 4.1 D