Rip Rap Construction Entrance Rock 3″ x 5″ crushed limestone construction entrance bull rock used to clean truck tires when leaving construction sites. Get Pricing Rip Rap Rock Some standard sizes for rip rap are 8″-12″, 12″-18″, and 18″-24″. Harder, non-flaky rock is necessary to prevent disintegration. We use a hoe ram to break large boulders into the size of rip rap requested by our customer. Get Pricing Contact us for a free consultation today... Contact