The Red Hill Activity Center at Tatum Park in Middletown, New Jersey is a great example of an alternative use of DeepRoot tree root barriers. The 18" depth product (Model UB 18-2) serves double duty as both an edging material and as protection from future root intrusion into the play area.
US: Nav Kaur (Nav@deeproot.com or 415-746-1557).
Canada: Mike James (firstname.lastname@example.org or 604-687-0899).
UK: Steve Chatwin-Grindey (Steve@deeproot.com or 02038484230).