"Bestunderpinning" underpins a stone hut in the Blue Mountains situated East of Katoomba. It has unique challenges of access, no water and no power. The hut is stabilizes by inserting 4 concrete pins bearing on rock and placing a trenched french drain to the rear of the property to direct water away from the hut. bestunderpinning.com.au #underpinningkatoomba #sandstonesubsidence #frenchdrain #repair #structuralrepair #underpinning, #concreteunderpinning