A tile installer or tile setter.
Assembly would be a name for putting things together.
The person is a steel-worker.
In architectural plans, the upstairs is typically referred to as the "upper floor" or "second floor," while the downstairs is called the "lower floor" or "first floor," depending on the building's layout. In some regions, the ground level may be referred to as the "ground floor." These terms help clarify the vertical organization of spaces in the design.
it will heat as long as the gas is on and your pilot is still lit, you would have to call your gas company to turn it off.
hydrologist
A tile installer or tile setter.
Tiles are the "square things". Altogether, the tiles make up the floor.
That person is a litter-lout, who is littering by dropping rubbish on the floor.
A picture made with with tiles and stone is a mosaic.
In the UK we call it the ground floor.
In America, a flat is an apartment. You might call that person an apartment dweller, a tenant, a renter, or in the case of a coop, they would be called the owner.
Google "replacement floor tiles". Example of what may be found: www.stonelocator.com. or google "floor tile replacements" Examples found: http://www.thisoldhouse.com/toh/skill-builder/0,,20057064,00.html
They call the tiles "bones." The pile of shuffled tiles is the "boneyard."
Catching tiles
A person who lays tile can be called a tile fitter or tile layer. Some people call it a tile mason, too.
Call a terrazzo floor installer.
Call the local home Depot & ask to talk with someone in Dept #23 Floor & wall.. They can recommend a pre mixed Mastic & give you the bucket sizes available & cost