How to best ventilate a reworked 1928 attic
I have a 1928 bungalow in Houston, Texas (read: hot and humid). I'm in the process of replacing my ductwork, and wanted to improve the ventilation in the attic while up there. It's getting extremely hot in the attic, and I'd like to prolong the roof's life, while getting rid of some of the hot air that is zapping my nice cold air inside.
This is a rectagular, Southward-facing, A-frame attic. Originally, there were gable vents at the front and back (South and North) of the house. 12 years ago, a previous owner renovated the home. They took out the front vent, and replaced it with a piece of glass. When they replaced the roof, they also put in a ridge vent. There are no other roof vents. There are also no soffit vents, or air intakes entering at the bottom of the roof. In fact there are no soffits, as the rafters are exposed. As for insulation, the remodeler blew in insulation, and it has settled in to a height just above the joists.
My initial thought was to add several soffit intakes along what I guess you might call the fascia (the 1x6's in between the rafters). Although I'm not sure "fascia" is the right term, since it's moved up and in, towards the attic. Then stick some of the styrofoam baffles on the inside to hold the insulation back.
1 Would I be better off just replacing the front glass with a vent, to get some cross-flow in the attic?
2 After adding soffit vents, is the rear gable vent going to hinder the airflow of whatever soffit & ridge system I am able to create?
3 Is there some sort of regional climate issue that I'm not aware... do soffit & ridge sytems not do well with hot and humid climates? I've seen some ridge vents in my neighborhood, but not mant soffits... are they hidden?
Thanks in advance... all advice is welcome!
This is what the overhang looks like... exposed rafters, no vent
This is the front gable... glass, no vent
This is the back gable... just a screened vent
Last edited by stephensandlin; 07-07-2009 at 02:16 PM.
Re: How to best ventilate a reworked 1928 attic
Howdy you can add soffit venting by drilling holes threw the 2by4 cripples between the rafters and adding screen over the holes from the inside. Need to have a source to allow cooler air to enter the bottom of the attic to then exit threw the gable vent. Replacing the front glass with a vent to allow cross ventilation is a good idea too. Here in OR they are then adding some fancy decorating trim in front of gable vents so they look pretty too. I would add baffling where i install the soffit vents so insulation cannot block them,. But i,d get more insulation blow in to that attic as sounds like you have far too little..... Oh did you check and see if when the ridge vent was installed did they leave a gap in the roof decking to allow air to flow out?