Lesson 2

Question 1

the most common high-mass floor system

Answer 1

concrete slab-on-ground

Question 2

in cold climates, insulating under the slab will reduce heat loss to the ground; permanently hot climates, insulating under the slab will prevent heat entering the home

Answer 2

concrete slab-on-ground

Question 3

can be used with lightweight infill and concrete topping. to contribute positively to thermal performance, the underside of suspended floors

Answer 3

suspended slabs or precast concrete beams

Question 4

these may be competitive in cost with conventional timber and steel framed floors, and can reduce site impacts where a slab floor is preferable to a lighweight floor

Answer 4

lightweight suspended concrete floor systems

Question 5

the underside of thin concrete slabs must be insulated; AAC provides sufficient insulation on its own many climate zones

Answer 5

lightweight suspended concrete floor systems

Question 6

less common. but is effective when properly designed and built for climate and site. such systems have either low or no embodied energy and minimal transport impact

Answer 6

compacted earth, flagstone or rock

Question 7

made with fine aggregates, cement, and an expansion agent that causes the fresh mixture to rise like bread dough

Answer 7

autoclaved aerated concrete ( AAC)

Question 8

this type of concrete contains 80 percent air. in the factory it is made, the material is molded and cut into precisely dimensioned unit

Answer 8

autoclaved aerated concrete (AAC)