Crowne Slate

Crowne Slate is a heavyweight designer asphalt shingle made by IKO for steep-slope roofing in the United States. It is a laminated shingle with two full layers of shingle material, and its square-cut contours follow the look of natural slate tiles.

It carries a Class 4 impact resistance rating and belongs to IKO's Designer Collection with Armourshake and Royal Estate. The data sheet is dated 05/2026.

Standard laminated shingles have two layers in only half the exposed shingle area. Crowne Slate has two full layers of shingle material laminated together. It is built on a fiberglass reinforcement and has algae-resistant granules.

• IKO's largest shingle coverage
• Blue-green algae resistance
• Shiplap feature
• Full two-layer design
• Class 4 impact resistance

• Length: 39 1/2 in. (1,003 mm)
• Width: 13 1/4 in. (336 mm)
• Exposure: 10 in. (254 mm)
• Shiplap: 3 1/2 in. (89 mm)
• Shingles per square: 40

• Shingles per bundle: 10
• Coverage per bundle: 25 ft.2 (2.3 m2)
• Coverage per four bundles: 100 ft.2 (9.29 m2)
• Bundles per pallet: 60
• Pallet size: 40 x 53 1/2 in. (102 x 136 cm)
• Stock number: 4450XXX, where XXX is the numerical color code

Crowne Slate is offered in four color blends. Royal Granite is a blend of dark gray and brown shades, and Regal Stone is another named color. The ZIP or postal code lookup on the IKO page filters Crowne Slate colors by region.

• ASTM D3462 and ASTM D3018 product standards
• ASTM D3161 Class F wind resistance
• ASTM D7158 Class H wind resistance
• ASTM E108 / UL 790 Class A fire resistance, when installed over an approved underlayment
• CAN/ULC S107 Class A fire resistance (Canada), when installed over an approved underlayment
• CSA A123.5 product standard (Canada)
• FM 4473 Class 4 impact resistance
• Miami-Dade County and Florida Building Code High-Velocity Hurricane Zone approvals, which apply only to shingles available in the southeast U.S. market
• Texas Department of Insurance details are referenced

The Class 4 impact resistance rating exists solely so that residential property owners can obtain a residential insurance reduction, if one is available. It is tested to FM 4473 and is not a guarantee against hail.

The Crowne Slate limited warranty term is Limited Lifetime, counted from completion of installation for as long as the owner owns the building. Hail damage to Crowne Slate shingles is outside the limited warranty.

• Iron Clad Protection: 15 years
• Limited wind warranty: 110 mph (177 km/h)
• Limited High Wind Warranty upgrade: 130 mph (210 km/h), which requires the High Wind Application
• Limited algae resistance warranty: 10 years (blue-green algae)

• Exposure to the weather: 10 inches
• Because of the shiplap feature, installation begins at the lower left corner of the roof
• Nails go in the nail line
• Open metal valleys are used
• Not applied to roof slopes below 2:12
• Slopes from 2:12 to less than 4:12 count as low slope and use the special underlayment requirements in the IKO application instructions
• Standard application: 5 nails per shingle
• Steep slope and high wind applications: 8 nails per shingle, with roofing cement applied
• For wind resistance, a spot of cement can be added at the shiplap at the time of installation
• Excessive roofing cement can cause blistering

IKO lists these accessories with Crowne Slate:

• EdgeSeal, for a stronger bond along drip edges
• IKO GoldSeam roof sealing tape, for vulnerable areas
• Stormtite synthetic underlayment
• IKO StormShield ice and water protector