It prevents heat from the house escaping
There is loft insulation to keep in all the warm air from the heater
It's used to insulate your loft.
dependes what type of loft insulation you have
Well, I only know the advantages of loft insulation which are:reduce gas & electricity billsreduce your home's carbon footprintkeep your house warmer in winterkeep your house cooler in summerprevent internal condensationimprove your home's energy efficiency ratingreduce noise from outside (e.g. traffic)And it is affordable and sometimes free!
the loft insulation is bad in that house
Generally, the heat in your house rises. This can mean that a lot of heat is lost through the roof. If you put insulation in your loft, the insulation is a poor conductor of heat so the heat stays below the loft and your loft is cold. Then less heat gets to the roof and so less heat is lost.
With no loft insulation you would lose a lot of heat through your loft and be colder, and spend a lot more money on fuel to keep warm in winter.
plastic
The thicker the loft insulation the less heat escapes The thicker the loft insulation, the more trapped air there is which helps to keep heat in as air is a good insulator.
conduction
my name is what
40%