In-Ground Home Roof: “Hobbit House” Written by dewardknapp on March 21, 2019. Posted in Replacement Roof. New Sika Sarnafil PVC Roof Initial excavation for the construction of the Hobbit House.Early view of the construction of the Hobbit House.Construction work site in Maple City, MI of the Hobbit House.Roof technicians applying the PVC membrane to the Hobbit House roof. The roof will ultimately be underground.Technicians continue to apply the Sika Sarnafil PVC membrane to the roof of the Hobbit House.Roof drainage for this underground roof requires special consideration.Exhaust ventilation and back door hatchway also must be waterproofed with the PVC membrane.The completed PVC roof being covered with earth.The earth covers the PVC membrane. A view of the completed Hobbit House.Another view of the completed Hobbit House with edging terra cotta roof tiles.Side view of the completed Hobbit House in Maple City, MI.Rear view of the completed Hobbit House. Previous Next