Chelsea Building Products Everlast Lap Siding in Storm Grey

Chelsea Building Products’ Everlast Lap Siding solves the moisture trap problem that traditional siding can’t touch. The cellular PVC core is virtually impervious to moisture, preventing rot, swelling, and delamination. At 1.3-1.5 lbs per square foot versus heavier fiber cement options, crews haul less weight up scaffolding. For jobs where freeze-thaw resistance matters — and that’s every Montana project — the siding maintains high strength retention after weathering and freeze-thaw cycles.

Superior Material Specifications

The numbers tell the real story. 0.225 inch thickness (±0.015 inch) with 11/16 inch panel projection gives this siding more substance than standard vinyl without the weight penalty of fiber cement. Standard reveal options include 6-7/8 inches and 4-1/2 inches, with 12-foot board lengths packaged 8 boards per bundle.

The advanced composite construction features a cellular PVC core with wood-grain-enhanced surface. This isn’t just marketing — the substrate is C CORE® mineral-enriched composite with advanced UV-resistant acrylic capstock, molecularly fused to the core. The CedarTouch® finish uses actual grain pattern impressions from rough-sawn top-grade cedar.

Specification	Value
Thickness	0.225” (±0.015”)
Panel Projection	11/16”
Reveal Options	6-7/8” or 4-1/2”
Board Length	12 feet
Weight	1.3-1.5 lbs/sq ft
Packaging	8 boards per bundle

Weather Performance Data

Water absorption rate below 2% beats traditional wood siding by miles. That specification alone changes the maintenance equation for Montana’s freeze-thaw cycles. Testing shows excellent weathering performance and low water absorption (<2%), with freeze-thaw testing passed.

The hail resistance coverage matters in Montana. Warranty includes hail damage coverage beyond homeowner’s insurance — rare for any siding product. The siding features high-impact resistance compared to vinyl and fiber cement.

The UV-resistant acrylic capstock provides fade protection, backed by color fade resistance coverage in the warranty. Storm Grey maintains its color through Montana’s intense high-altitude UV exposure.

Wind performance tested to serious standards: allowable pressure up to 68 psf with screws. That handles Montana’s chinook winds and mountain gusts without the nail-popping issues that plague lesser sidings.

Installation Efficiency

The EZ-Stack™ interlocking design speeds installation compared to lap-and-nail systems. Stainless steel brackets reinforce each plank-to-plank seam — no relying on nails alone for structural integrity.

Installation requires structural wood sheathing (OSB or Plywood) as substrate. Fastening uses corrosion-resistant screws or nails at 16 inches on-center. Specific gaps (typically 1/4 inch) at trims and corners accommodate thermal movement.

No caulking or seam sealing required. That’s not just installation savings — it’s eliminating a maintenance failure point. Traditional siding needs caulk touched up every few years. Skip that entirely.

Installation requires a dedicated Everlast starter strip for the first course. Works with Everlast color-matched composite trim or standard cellular PVC trim, including Storm Grey color-matched composite trim, J-channels, and outside corner posts.

Code Compliance & Certifications

Building departments recognize the certifications that matter. CCRR-0201 Code Compliance Research Report from Intertek covers the bases. Florida Building Code #FL22980-R1 approval means it handles high-velocity hurricane zones — overkill for Montana, but proof of engineering.

Fire ratings check out: ASTM E84 with flame spread index <75 (Class B). Additional fire testing includes ASTM D635 (Class CC1) and ASTM D1929 for ignition temperature.

Certification	Standard/Number
Code Compliance	CCRR-0201
Florida Building Code	FL22980-R1
Texas Approval	TDI #EC-107
Fire Rating	ASTM E84 Class B (flame spread <75)
Burn Rate	ASTM D635 (Class CC1)
Ignition Temperature	ASTM D1929

Fully recyclable construction and manufactured in the U.S.A. round out the compliance story.

Installation Notes & Warranty

Limited Lifetime Warranty, fully transferable to one subsequent homeowner. Coverage includes manufacturing defects, hail damage beyond homeowner’s insurance, and color fade resistance. 100% replacement guarantee for the original owner backs the durability claims.

Storm Grey is one of 15 available colors in the Everlast palette. The complete color range spans from Natural White to Cabernet Red, with Storm Grey sitting in the contemporary neutral zone that works with Montana’s natural landscapes.

FAQ

What makes Everlast different from standard vinyl siding?

Everlast is significantly thicker and more rigid than standard vinyl siding. The 0.225-inch thickness provides structural integrity vinyl can’t match. It offers more realistic wood grain through CedarTouch technology and higher wind-load resistance. The cellular PVC core is virtually impervious to moisture, unlike hollow-back vinyl that can trap water.

How does the weight compare to fiber cement for installation?

At 1.3-1.5 pounds per square foot, Everlast weighs substantially less than fiber cement siding. It’s lighter and easier to handle, reducing installer fatigue and allowing faster installation. The lighter weight also means less stress on the structure.

Does the thermal expansion require special installation techniques?

Yes. Installation requires specific gaps (typically 1/4 inch) at trims and corners to accommodate thermal movement. The EZ-Stack interlocking system is designed to handle expansion and contraction without buckling. Following manufacturer specifications for gap spacing prevents thermal stress issues.

What’s included in the hail damage warranty coverage?

The warranty provides hail damage coverage beyond what homeowner’s insurance covers. This addresses the deductible gap — if hail damages the siding but doesn’t meet your insurance deductible threshold, Chelsea covers the replacement. Specific coverage limits and terms require warranty document review.

Can this siding handle Montana’s freeze-thaw cycles?

Testing confirms it can. The siding maintains high strength retention after weathering and freeze-thaw cycles. The cellular PVC core is virtually impervious to moisture, preventing the rot, swelling, and delamination that destroys wood siding in freeze-thaw conditions. Water absorption below 2% means minimal moisture to freeze and expand.