1 A retired Regular officer who also is employed by the federal government and is subject to the dual compensation statutes may have that reduction reduced because of the waiver of retired pay to receive VA benefits.
If they don't, then 4 thick is usually standard for a patio slab, how large or small it is doesn't really matter. The most important part is the sub-base. Make sure you have a good gravel base. I would recommend at least 12 inches of compacted gravel. I like gravel where the aggregate (rocks) are no larger than 1.
For a patio or similar area subjected to just foot traffic, chairs and tables: 1  Thickness of concrete - 100mm (4 inches). 2  Thickness of sub-base - 100mm (4 inches). 3  Slope of the concrete - 1 in 60 (16mm in 1 metre, 5/8in in 3 ft). 4  Expansion joints-every 3 metres (10ft) in both directions. pad for light structures. 1  Thickness of the concrete - 75mm (3 inches). 2  Thickness of the sub-base - 75mm (3 inches). 3  Slope of the concrete - 1 in 80 (12.5mm in 1 metre, Â½in in 3 ft).