Searching for Gray Slate Hardie Board houses in Minnesota? Earthy and warm, James Hardie’s Gray Slate is a natural choice for your Minneapolis home. Looking for a neutral alternative to taupe or brown? The Gray Slate James Hardie siding color works well as a seamless extension of nature’s palette. Gray Slate is a grounding neutral for the main body of a home. As an accent color, Gray Slate plays well with other shades of gray and taupe for a soft and muted exterior. As rugged and enduring as a stone path, Gray Slate will stand the test of time.