However, as projects become larger than 50,000 square feet, the lower price of concrete starts to offset tilt-up construction's fixed costs and this method becomes cost-competitive with a metal building.ccording to the Tilt-up Concrete Association, at least 10,000 buildings are constructed annually that enclose more than 650 million square feet. Tilt-up concrete construction is not new; it has been in use for well over a century.
A castle (from Latin: castellum) is a type of fortified structure built in Europe and the Middle East during the Middle Ages by nobility.Scholars debate the scope of the word castle, but usually consider it to be the private fortified residence of a lord or noble.he word castle is derived from the Latin word castellum which is a diminutive of the word castrum, meaning fortified place. The Old English castel, Old French castel or chastel, French chateau, ChÃ¢teau spanish, Castillo italian, castello and a number of words in other languages also derive from. castellum
Fortress. a strategically important point (or city) with a permanent garrison, armament, supplies, and independent headquarters, which is prepared for perimeter defense by means of permanent fortification and the provision of everything necessary for prolonged battle under siege conditions.he fortress castle was the residence of the feudal lord and the place where he stationed his armed detachment, whose function was to hold the population of the subordinate areas and cities in submission and wage combat against neighbors.