This galvanized steel Z-bar delivers exactly what Montana contractors need: 5/8-inch seat width for exact siding fit. The 31-32 gauge (0.010 inches thick) profile handles Montana’s freeze-thaw cycles without the premium material cost of aluminum alternatives.
Critical Dimensions and Installation
The numbers matter on this one. 10-foot lengths with 5/8-inch seat dimension and 1-7/8 to 2-inch total flange height mean fewer joints and better water management across typical 8-foot wall sections. At 1.04 pounds per piece, crews can handle these all day without fatigue.
| Specification | Value |
|---|---|
| Length | 10 ft. (120 inches) |
| Seat Width | 5/8 in. (for 5/8 in. siding systems) |
| Total Flange Height | 1-7/8 in. or 2 in. |
| Front Leg | 0.75 in. (typical) |
| Material Thickness | 31-32 Gauge (approx. 0.010 inches thick) |
| Weight | 1.04 lb per piece |
Installation follows standard Z-bar practice: Install the lower course of siding first, then position the Z-bar over the top edge of the lower siding piece. Ensure the 5/8-inch seat fits snugly against the siding thickness before nailing the vertical flange to the wall sheathing. Install the upper course of siding over the Z-bar’s upper flange to create positive drainage. Overlap adjacent lengths by at least 2 inches — this isn’t the place to save material.
Material Performance and Application
ASTM A653 compliance means this steel meets the standard specification for zinc coating that protects against Montana’s moisture. The galvanized zinc finish handles snow melt, spring rain, and temperature swings that would rust bare steel in a season.
Steel offers more rigidity and is generally more economical than aluminum Z-bar, though aluminum won’t rust if scratched. For most Montana applications where cost matters and proper installation prevents coating damage, this galvanized steel delivers the performance needed.
Compatible with T1-11, fiber-cement, and wood board siding, this Z-bar works across the spectrum of Montana siding choices. The profile protects horizontal joints where water wants to infiltrate, creating that critical barrier between upper and lower courses.
Frequently Asked Questions
Q: Will this Z-bar work with 5/8-inch T1-11 siding? A: Yes. The 5/8-inch seat dimension is specifically designed for 5/8-inch siding systems, including T1-11, fiber-cement, and wood boards. Ensure the seat fits snugly against the siding thickness during installation.
Q: How much overlap is required between adjacent pieces? A: Overlap adjacent lengths by at least 2 inches to ensure continuous water protection. This prevents gaps that could allow water infiltration at the joints.
Q: What’s the actual thickness of this galvanized steel? A: 31-32 gauge, approximately 0.010 inches thick. This thickness provides adequate rigidity while remaining workable for field cutting and installation.
Q: Does this meet building code requirements for flashing? A: ASTM A653 compliance certifies the zinc coating quality. ICC-ES evaluation reports provide general flashing guidance. Check local code specifics for your area.
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