Rock Solid Materials was founded to furnish the greater Chicago & Milwaukee markets with high quality soil modification and stabilization products.  RSM is located off Waukegan Harbor, within minutes of major interstates, and has 27,000 tons of storage capacity of dry bulk powders such as cement, fly ash, lime kiln dust, quicklime, slag, and more.  We operate from 4:30 am until 3:30 pm Monday through Friday, and from 4:30 am until 12:00pm on Saturday.