James Hardie HZ10 5/4 Smooth Primed Fiber Cement Trim Board, 12 ft Lengths
James Hardie HZ10 5/4 trim is a smooth, primed fiber cement trim board for exterior siding details in the HZ10 climate zone. The line includes 3.5 in., 5.5 in., 7.25 in., 9.25 in. and 11.25 in. widths in 12 ft pieces. Each piece is sold individually and pairs with James Hardie HZ10 lap and panel siding.
Key Features:
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Fiber cement construction: Made of fiber cement engineered for exterior trim applications.
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Smooth primed face: Each board comes smooth-textured with a primed finish ready for paint.
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Multiple widths: Available in 5/4 stock in 3.5, 5.5, 7.25, 9.25 and 11.25 in. widths.
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12 ft lengths: Boards come in 12 ft lengths to reduce joints on long runs.
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HZ10 rated line: Part of the James Hardie HZ10 product line for its designated climate zone.
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MF option: A multi-family (MF) version of the 3.5 in. 5/4 smooth primed trim is offered.
Specifications Table:
| Specification |
Details |
| Brand |
James Hardie |
| Sell unit |
1 piece |
| Product line |
James Hardie HZ10 |
| Material |
Fiber cement |
| Color / finish |
Primed |
| Available colors |
Primed |
| Available sizes |
5/4 in. thickness in 3.5 in., 5.5 in., 7.25 in., 9.25 in., 11.25 in. widths, 12 ft lengths; MF 3.5 in. variant also offered |
| Dimensions |
5/4 in. x 3.5 in. to 11.25 in. x 12 ft |
| Finish / texture |
Smooth |
Coverage & How Much You Need:
One 12 ft piece covers 12 linear feet of trim run; plan one piece per 12 ft of edge, corner, band or fascia detail, allowing cuts for openings and waste.
Fit and Compatibility:
Designed for use with James Hardie HZ10 siding systems, including lap siding and panels. Fasteners and flashing accessories are sold separately.
Frequently Asked Questions (FAQ):
Q: What is included with one order?
A: One piece of James Hardie HZ10 5/4 smooth primed fiber cement trim in the selected width and 12 ft length.
Q: Which widths are available?
A: The line includes 3.5 in., 5.5 in., 7.25 in., 9.25 in. and 11.25 in. widths in 5/4 thickness, plus a multi-family 3.5 in. variant.
Q: Is the trim ready to paint?
A: Yes, each board arrives primed with a smooth surface and is designed to be finished with exterior paint.
Q: Can it be cut on site?
A: Fiber cement trim can be cut with appropriate fiber cement cutting tools and dust-control practices.
Q: What siding does it pair with?
A: It is intended for use with James Hardie HZ10 siding installations as corner, band, fascia and edge trim.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
Choose the width closest to the casing or corner detail you are trimming; 3.5 in. suits window and door casing while 7.25 to 11.25 in. works for corners, bands and fascia. Prime all cut edges before installation and follow the manufacturer's fastening schedule. On exposed south and west elevations, a topcoat of quality exterior paint protects the primed surface.
Cut fiber cement outdoors with dust-reducing tools and wear a respirator, eye protection and gloves, as silica dust and cut edges pose hazards.
Order James Hardie HZ10 5/4 smooth primed trim today and finish your siding project with a durable fiber cement trim line.
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