Finlandia Outdoor Sauna
"Our outdoor Sauna [....] includes an unassembled cedar shingle roof package. You supply the waterproof pad and we provide the insulated modular room. Outdoor Saunas may be assembled on a concrete pad or on a deck. If installing on a deck first put down a sheet of ¾" plywood covered by vinyl or use concrete board with tile. The roof package includes wood plates, prefab rafters, nailers, facing, metal flashing, cedar shingles, ridge cap, and nails. You put it together. It includes the same components as the standard FPF package. The Finlandia Outdoor Sauna is available in sizes ranging from 4'x 4' to 8'x 8'."