Sometimes when your calcium/magnesium ratio is off, you can get twitching. I get one in my diaphram that feels like a fish flopping in my chest. If you are low in calcium intake, or very low in magnesium, the muscles do a dance of sorts. So you could try to balance that out.
(February 2017) A concrete slab is a common structural element of modern buildings. Horizontal slabs of steel reinforced concrete, typically between 4 and 20 inches (100 and 500 millimeters) thick, are most often used to construct floors and ceilings, while thinner slabs are also used for exterior paving.
Building a floating slab is one of the most economical methods of constructing a foundation. Traditional foundations include a strip footing with a frost wall above. The strip footing is installed below the frost level, usually 4'-0 below grade. The cost of a strip footing and frost wall is alot higher because there is more excavation, concrete and labour required.