Why wouldn't I use R-30 all around my house walls and ceiling included to keep heat in my house? Can anyone explain why the different value are neededMy friend just put R-30 in his bathroom walls.
Terrible for thatYes, aluminum is very easy to shape things with, but it has very poor conductionPut some tin foil in a real hot oven, remove it with oven mits, and then touch it with your bare skin as fast as you canIt will barely be warmThat's how bad it is at conducting heat
As the others explained forcing higher insulation values into walls is badOn the bag of insulation it will state for what depth of wall to use the insulation in With pink panther insulation you can get R-12 and R-14 insulation for 2X4 wallsThe only difference between them is costSo in this case R-14 would be the better insulation but might cost $10 more a bagHowever they also sell R-20 insulation, but on the bag it states it's for 2X6 wallsThis wouldn't be suitable for the application if you had 2X4 walls, but would be the proper choice if you had 2X6 wallsThe reason you wouldn't use insulation for a 2X6 wall in a 2X4 wall is because in order to fit it in you need to compress the insulation into the wallInsulation is designed with air pockets inside of it to interupt the transfer of heat between the individual strands of fiber so that it slows down heat escaping the houseWhen you compress the insulation all the strands start touching each other and you start to loose the insulating qualitiesSo if you used R-30 insulation designed for a 10 wall and compressed it into a 4 wall you will have reduced the R value of the insulation and effectively wasted your money.
