Quote:
Originally Posted by redpoint5
LOL, might want to include a smiley to make it unambiguous the comment was made in jest.
I wonder what "CO2" equivalent there is installing white asphalt shingles instead of black? Seems like low hanging fruit considering there is no extra cost for white. White actually costs less when you consider it lasts longer.
I had considered this when putting a new roof on the house several years ago, but black simply looks better and goes with more color schemes. Had to give more weight to resale value than to longevity or reflectivity.
Still, reflecting 4x more energy with white asphalt shingles vs black is no small thing. Very valuable in hot and sunny regions and pays dividends in reduced cooling load.
I expect the greening of the earth to continue as it has been, especially as poorer countries become educated and rise from poverty. Their cities will grow and green spaces can be reclaimed. |
1) The thermal insulation above the ceiling cannot perceive the infrared radiation you experience when you go up into your attic.
2) R-Factor is based solely upon the dry-bulb delta-T between the 'outside' of the home's envelope, and the 'inside.'
3) If the temperature, just above the attic insulation is no more than 10-degrees-F higher than the ambient outdoor dry-bulb temperature, you're 'golden.'
4) If it's more than 10-degrees, you need more ventilation.
5) Add soffit vents under the eaves, and ridge ventilation equal to the net area of the soffits, based upon recommendations for your area.
6) Ideally, your AC unit and all your ductwork should be within the conditioned space.
7) If you're on pier and beam, with underfloor ducting, the floor needs to be at least R-19, and all the ductwork needs proper insulation wrap and vapor barrier. All seams sealed with mastic.