Quote:
Originally Posted by DangeloInspections
Dependent on how old your house is, your R Value is most likely either 30 or 38. It should not need "refreshing" unless workers have been up there and trampled it. While there IS a law of diminishing return, R-38 should be the new minimum, you can go more. As to the garage, there are different views. You will notice more of a difference insulating your garage doors to fight the radiant heat than you will get from insulating the garage ceiling.
While many say they noticed a benefit, the ceiling insulation will also hold the heat IN the garage, especially from hot car engines, etc. Heat rises. Insulating the garage doors is a no brainer. There are different options for you to do that.
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Thanks for the reply. So you bring up an interesting point that I've been wondering about and no one seems to have the answer. I have insulated my garage doors and have noticed a difference. But you are right, the garage is going to be at the outside air temperature plus the heat from the car and any solar gain from the doors. I can see that in the late afternoon my garage is hottest because the west sun is beating on the doors. Without garage attic insulation as I have it now, the heat will rise and go into the attic where I have 2 solar vent fans. Since i've installed the solar vent fans my attic never goes above 10 degress higher than the outside air temperature where before it used to super heat on the hottest days so it makes sense to me NOT to insulate the garage ceiling in order to allow the excess heat in the garage to escape through the ceiling to the attic, correct? In the winter you would want the heat to stay in the garage but since it's not living area it doesn't make much sense. BTW, my 2016 Ivy came with the radient heat shield installed in the entire attic including over the garage which i'm sure is making a huge difference.
As far as adding insulation to the main attic, I think I have R38, I have to check but I have no confidence that all the insulation is perfect up there so for the extra cost I can add 4 inches to increase what's there now and to make sure every spot is covered properly. You are right, everytime someone goes up there to inspect they are tamping down the insulation. When i had my Lanai done, I had them cover their steps on the way out which they happy did.
As far as the cost, I rather pay a little more and have someone licensed and bonded and does this stuff every day to lessen the possibiliy of having a problem with my ceiling when doing the job.