Isn't that test a little biased as heat traveling via light rays can penetrate further into the more transparent material. Wouldn't the test be more accurate if the heat lamps were shining onto an opaque surface and then transferring the heat from there? Would resemble a closed cavity just like you'd find in a wall or ceiling.
Absolutely. You are spot on. Thanks for commenting. The truth is, there are pros and cons to both types. This test is an oversimplification that is just there to get us (as I did) to click on it and sell one product or the other.
I agree. Last I checked, the sun wasn't directly in my attic. It was outside and above the attic, and the light wasn't directly hitting the insulation, but was hitting the shingles instead and the radient heat had to penetrate the roof, before entering the attic, without any success of the suns rays entering inside the attic, as of yesterday. I'm pretty sure today will be the same.😂
@@MrItalianfighter1 the same amount of heat will pass through the roof, so it makes no difference because that will be a constant. What differs is the insulation and that is what is being tested here. What is being measured is how much or fast heat passes through the insulation.
Why are the thermometers in the middle of the insulation? Shouldn't they be at the bottom of the insulation? If not under a layer of sheathing and a layer of painted sheet rock?
Good explanation of Cellulose vs Fiberglass! Any input on the mineral wool style insulation?
Isn't that test a little biased as heat traveling via light rays can penetrate further into the more transparent material. Wouldn't the test be more accurate if the heat lamps were shining onto an opaque surface and then transferring the heat from there? Would resemble a closed cavity just like you'd find in a wall or ceiling.
No.
Absolutely. You are spot on. Thanks for commenting. The truth is, there are pros and cons to both types. This test is an oversimplification that is just there to get us (as I did) to click on it and sell one product or the other.
I agree. Last I checked, the sun wasn't directly in my attic. It was outside and above the attic, and the light wasn't directly hitting the insulation, but was hitting the shingles instead and the radient heat had to penetrate the roof, before entering the attic, without any success of the suns rays entering inside the attic, as of yesterday. I'm pretty sure today will be the same.😂
@@MrItalianfighter1 the same amount of heat will pass through the roof, so it makes no difference because that will be a constant.
What differs is the insulation and that is what is being tested here.
What is being measured is how much or fast heat passes through the insulation.
Why are the thermometers in the middle of the insulation? Shouldn't they be at the bottom of the insulation? If not under a layer of sheathing and a layer of painted sheet rock?
If the thermometers were on the sheetrock, the numbers would be lower, but they would still be different based on the thermal performance.
@@WiseHomeEnergyLLCRochester That's just not very scientific, however: you're making assumptions.