Trex Lineage Salt Flat Grooved delivers premium composite decking in 16-foot boards measuring 0.94” x 5.5” actual dimensions. At 40.63 pounds per board, it’s engineered for Montana’s punishing temperature swings and intense high-altitude sun exposure.
The standout feature? SunComfortable™ technology reduces deck surface temperature up to 35°F compared to traditional composite boards. That’s the difference between barefoot-comfortable and shoe-mandatory on a July afternoon in the Flathead Valley.
Heat Mitigation and Fire Resistance
The engineered reflective shell technology makes this decking practical where others fail. Traditional dark composites turn into griddles under Montana’s elevation-intensified UV. Salt Flat’s gray-white colorway combined with SunComfortable™ heat reduction keeps surfaces tolerable even during peak summer sun.
Fire resistance matters more every year. Trex Lineage includes both WUI (Wildland-Urban Interface) Compliant and IWUIC ignition-resistant certifications. These certifications are critical for rooftop and waterfront applications where building codes demand fire-rated materials. For properties in Montana’s expanding wildfire zones, this certification can mean the difference between approved permits and rejected plans.
The 3-sided high-performance shell protects against more than just heat. It delivers superior scratch, fade, stain, and mold resistance — essential qualities when you’re dealing with 100-degree temperature swings between January lows and July highs.
Installation Specifications
| Specification | Value |
|---|---|
| Joist Spacing | 16 inches on center (residential) |
| Joist Spacing (Commercial) | 12 inches on center (commercial/diagonal) |
| Board Weight | 40.63 lbs per 16 ft. board |
| Actual Dimensions | 0.94 in. x 5.5 in. x 16 ft. |
| Compatible Fasteners | Trex Hideaway Universal, Tiger Claw TC-G |
| Gapping | Automatic 1/4-inch with hidden fasteners |
Hidden fasteners provide automatic 1/4-inch gapping — no measuring, no guessing. The grooved edge profile is designed specifically for hidden fastener systems, delivering the clean look clients expect from premium decking.
Weight matters on elevated decks. At 40.63 pounds per 16-foot board, structural calculations need to account for the additional dead load compared to standard 5/4” treated decking. Factor this into joist sizing and post spacing, especially on multi-story installations.
50-Year Warranty Coverage
The 50-year residential limited warranty backs up the premium positioning. This includes a 50-year fade and stain warranty — the longest in Trex’s lineup. Coverage protects against material defects, checking, splitting, rotting, and structural damage from fungal decay.
That warranty length matters in Montana’s freeze-thaw environment. Lesser composites show their age after 15-20 winters. Lineage’s warranty suggests confidence in long-term performance where temperature cycling breaks down inferior products.
Made from 95% recycled wood and plastic composite, the material composition delivers durability without the maintenance headaches of natural wood. No sanding, staining, or painting required — just soap and water cleaning with power washing allowed under 3100 psi.
Frequently Asked Questions
What makes Salt Flat different from other Trex lines?
Lineage is the premium tier offering higher scratch resistance, a longer warranty (50 years vs 25-33 years), and heat reduction features not found in lower tiers. The SunComfortable™ technology and 50-year warranty set it apart from Trex Select or Enhance options.
Can this handle Montana’s temperature extremes?
SunComfortable™ technology reduces surface temperature up to 35°F, making it practical for high-altitude sun exposure. The 50-year warranty coverage includes protection against checking, splitting, rotting, and structural damage from fungal decay — designed for extreme weather cycling.
What fasteners work with the grooved boards?
Compatible hidden fasteners include Trex Hideaway Universal Fasteners and Tiger Claw TC-G. These fasteners provide automatic 1/4-inch gapping without manual spacing.
Is the fire rating legitimate for WUI zones?
Trex Lineage includes both WUI (Wildland-Urban Interface) Compliant and IWUIC (International Wildland-Urban Interface Code) Ignition-Resistant certifications. These aren’t marketing claims — they’re code-compliance certifications required in many Montana jurisdictions.
What’s the actual weight I’m dealing with?
Each 16-foot board weighs 40.63 pounds. Plan your crew size and lifting equipment accordingly, especially for elevated deck installations.
Ready to Get Started?
Our decking & railing specialists can help you find the right Trex products for your project.
More from Trex
Explore All Trex Products
We carry Trex across all 11 Montana and Idaho stores.
