Choose Your Sub-Base
Each guide details the specifications, tolerances, and cure times required to support the GTC FIT™ Locking System.
Concrete Base
Concrete Sub-Base Build Guide
Specifications for a reinforced concrete pad: thickness, rebar, expansion joints, slope/pitch for drainage, cure time, and surface tolerance before tile installation.
- 4" minimum thickness with #4 rebar grid
- 1% pitch (1/8" per foot) for drainage
- Broom finish, no curing compounds
- 28-day cure before tile install
Asphalt Base
Asphalt Sub-Base Build Guide
Specifications for a paved asphalt base: aggregate sub-base depth, binder and surface course, compaction standards, slope, and recommended cure period before tiling.
- 6" compacted stone sub-base
- 2.5" binder + 1.5" surface course
- 1% slope, single-direction pitch
- 30-day cure before tile install
Gravel / Permeable Base
Permeable Crushed-Stone Build Guide
Engineered open-grade stone base for properties near impervious-coverage limits. Covers excavation depth, geotextile fabric, stone gradation, and laser-leveled finish.
- 8–12" excavation with geotextile separator
- Open-graded #57 stone, choker course on top
- Plate-compacted in 2" lifts
- Laser-leveled to ±1/4" tolerance