If you have Ridge Vents on your roof, please go check all your soffit vents (located under the eaves).
These should not be blocked, painted over, clogged with dust/dirt or covered with insulation.
And make sure your builder put enough in for attic square footage, and that they actually cut the holes big enough for each vent.
Even if you add a fan to your roof (solar or electric) or extra whirlybirds, if you don't have enough "NFA" for intake, you aren't helping much, especially if you have fans... if those fans can't pull air from those vents, they will pull them from air conditioned house (assuming you don't have a 100% sealed ceiling... which you likely don't)
My damned builder didn't put enough in and they cut the rectangles about 1-2 inches too small on every soffit vent. That reduce each vents value by 20 to 40 square inches... almost everyone was installed under a rafter further reducing that NFA.
Oh, and it took me 20 years to finally research this... so I feel dumb for not really researching it before.
Here's a calculator for you:
https://www.owenscorning.com/roofing/components/vent-calculator
And if you all knew this and are shaking your head after reading it, that's fine. Just trying to help at least one person.
(FYI, I checked my neighbors on both sides... one of them has fully closed vents that have been painted over. Don't know if they did it or original builder did, but they are not getting any airflow). Other ones had the vents open at least (not smushed down, but they are completely clogged by dust/dirt and are cut too small like mine were.)
These should not be blocked, painted over, clogged with dust/dirt or covered with insulation.
And make sure your builder put enough in for attic square footage, and that they actually cut the holes big enough for each vent.
Even if you add a fan to your roof (solar or electric) or extra whirlybirds, if you don't have enough "NFA" for intake, you aren't helping much, especially if you have fans... if those fans can't pull air from those vents, they will pull them from air conditioned house (assuming you don't have a 100% sealed ceiling... which you likely don't)
My damned builder didn't put enough in and they cut the rectangles about 1-2 inches too small on every soffit vent. That reduce each vents value by 20 to 40 square inches... almost everyone was installed under a rafter further reducing that NFA.
Oh, and it took me 20 years to finally research this... so I feel dumb for not really researching it before.
Here's a calculator for you:
https://www.owenscorning.com/roofing/components/vent-calculator
And if you all knew this and are shaking your head after reading it, that's fine. Just trying to help at least one person.
(FYI, I checked my neighbors on both sides... one of them has fully closed vents that have been painted over. Don't know if they did it or original builder did, but they are not getting any airflow). Other ones had the vents open at least (not smushed down, but they are completely clogged by dust/dirt and are cut too small like mine were.)