(214) 807-0414Request an assessmentVentilation guide
Attics in this region fail on intake far more often than on exhaust. Vents get added at the ridge because that is the visible half of the system, while the soffit openings meant to feed them stay painted shut, blocked by insulation, or were never cut to the size the products assume. Air that cannot get in cannot get out, and the roof ages from underneath.
In short
Exhaust at the ridge only works if there is at least as much intake at the eave feeding it. Adding more vents up top does not fix an attic that is starved at the bottom; it just moves less air more expensively.
01
The commonly cited guideline is roughly one square foot of net free ventilating area for every 150 square feet of attic floor, relaxed toward 1:300 where intake and exhaust are properly balanced or a vapour retarder is present. Treat it as a starting point for a calculation on the actual products, not as a specification on its own.
02
A powered fan or a row of box vents on the same attic as a continuous ridge vent tends to draw air from the nearest opening rather than from the eaves. That means pulling down through the ridge instead of up through the attic, and the far end of the space stops moving air at all. One exhaust type per attic area is the safer rule.
03
Ventilation is not only a heat question. Air leaking up from the house carries moisture, and when it condenses on a cold deck it shows as staining, rusted nail points and damp insulation that gets reported as a roof leak. Sealing the ceiling plane matters as much as adding vents.
Questions
Not automatically. On an attic that already has continuous ridge and soffit venting it can work against the passive system, and where intake is short it can pull conditioned air out of the house through gaps in the ceiling. Whether it helps depends entirely on what is already there.
Exhaust often can. Intake is the harder half because it usually means work at the soffit rather than on the roof surface, and that is the half most attics actually need.
Usually not, or not by much. Attic ventilation exists to protect the roof assembly and manage moisture, not to cool the rooms below it. What makes an upstairs hot is generally insulation depth, air leaking between the house and the attic, and ductwork running through hot space, and those are what to have looked at first. Correcting a genuinely blocked or unbalanced system is worth doing on its own merits. Expecting it to solve a comfort problem tends to end in more vents and the same complaint.
A correctly made ridge vent with an external baffle sheds driven rain, and the failures are nearly always in the fitting rather than in the idea: a slot cut too wide or too narrow, ends left open, or a vent fastened down without its baffle seated. Snow is not the issue here that it is further north; wind-driven rain is. If a ridge vent is wetting the insulation directly beneath it, that is an installation question with an answer, not a reason to close the ridge.
It is roofing work in the sense that the roof depends on it, and it happens at the soffit rather than on the roof surface, which is exactly where it goes missing between trades. Ask for intake to be named in the scope: how many openings, where they go, what net free area they add, and whether the soffit board is being cut or only fitted with vents over solid board. A quotation listing new ridge venting and nothing at the eave has priced half a system.
Assessment request
Short, routing-only questions. Nothing here asks you to diagnose the roof yourself.