HOUSTON--(BUSINESS WIRE)--Westlake Royal Building Products ("Westlake Royal"), a Westlake company (NYSE:WLK), today announced an expanded partnership with Alexandria Moulding, a leading moulding manufacturer and distributor of specialty building products in North America. To strengthen Westlake Royal's distribution in Canada, Alexandria Moulding will now stock and distribute Versetta Stone®, a mortarless, cement-based stone veneer siding panel, at its locations in Alexandria, Ontario, Calgary,