In cold climates or in very low-energy buildings, installing insulation below the ground cover is recommended. When a slab is poured over the ground in this application the temperature and humidity conditions in the crawlspace become very stable and essentially identical to the interior.
Per USDA standards, a dozen small eggs weigh at least 18 ounces, which is around 1.5 ounces per egg. A dozen medium eggs should weigh a minimum of 21 ounces, which is around 1.75 ounces per egg. A dozen large eggs weighs at least 24 ounces, which is 2 ounces per egg on average. Extra-large eggs should weigh a minimum of 27 ounces for a dozen, which is an average of 2.25 ounces per egg. Jumbo eggs weigh at least 30 ounces per dozen, which is around 2.5 ounces per egg. Learn more about Chickens.
A dry chicken eggshell is about 78-94% calcium carbonate (CaCO3). Calcium carbonate gives shells hardness and strength. Laying chickens need about 4 grams of calcium a day to produce quality eggs (source: Butcher, Concepts of Eggshell Quality).