Originally Posted by DIY4EVER
Wouldn;t the insulation in th eceiling keep the warmth in the basement?
Why then do you insulate an attic if it makes the living space below cooler?
Insulation slows the exchange of heat from a warmer space to a cooler space. When you insulate the unheated attic floor above a heated second floor room, you're preventing heat loss from the heated space below. When you insulate the unheated basement ceiling below a heated first floor, you're preventing heat losss from the heated space above to the basement below. Don't think in terms of direction here, just temperature gradients. You want to put insulation around the heated parts of the house, above, below and around the sides.