Question

Sorry if this too much. You. Don't have to do all of it if you don't want to​

Answer 1

a) attached image

b)Cavity wall insulation is used to reduce heat loss through a cavity wall by filling the air space with material that inhibits heat transfer. This immobilizes the air within the cavity (air is still the actual insulator), preventing convection, and can substantially reduce space heating costs.

c)1st one- R

2nd one- R

last one R

d)20

Step-by-step explanation: