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QUESTION:2 years ago we had the front of the house stuccoed and the vinyl sided the rest
of the house. So now it's very tight. Didn't notice any problems. Now we
noticed basement felt too warm is summer. There's negative pressure by furnace
and water heater. This happpens when little attic fan goes on. Contractor came
back and put 14 vents in soffits. This didn't solve problem. Pilot stays on but
when I hold match near vent in blows down or out. Is there anyway to vent attic
better so fan doesn't do this?
ANSWER: Your furnace room needs "make up air" (sometimes called "combustion supply
air"). This is fresh air from an outside source (an outside wall, probably
in your case the attic area), usually delivered via a metal pipe, although
if your furnace room has an outside wall it could be through grills/vents.
If by "attic fan" you mean a powered attic ventilator, then your contractor
needs to add more soffit vents and MAKE SURE they are actually cut through
to the attic. Can't tell you how many people get their soffits/facias
vinyled with soffit vents only to find the contractors didn't cut the old
plywood to allow for air flow ...
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