To Vent or not to Vent, that is the question
Hi There. I was wondering if anyone could help me? I need some advice.
We have a big detached two-story garage that needs new shingles for the roof. There is not an attic, per se. The second floor is only a half-open loft-type studio, very rough, that we use mostly for storage. So far the ceiling is just open framing on the inside. There is insulation installed under the roof which is attached directly to the ceiling. There is no gap between ceiling and insulation to allow for any airflow. Then there is plastic sheeting over the insulation to provide, I assume, a vapor barrier (stapled to the ceiling beams) just as it was done on the walls. The ceiling was insulated exactly the same way as the walls and i have never seen ceilings done this way before now.
My questions are concerning the insulation and the need to vent when we reroof. We only use the garage to store vehicles, tools and lawn furniture. There is plenty of air circulation below but it does get awfully hot upstairs. (However, we aren't storing Monets, if you know what I mean so that is not a huge concern.)
These are my questions and concerns:
1. Is there any danger leaving the insulation the way it is? Assuming there is no danger, then, when I leave the insulation where it is do I not vent it?
Or when i leave the insulation where it is should I do some creative venting? (i.e. bring down/extend vent tubing below the insulation)? Without a gap, would that not defeat the purpose of an airvent? Might let out hot air but not help with moisture. I am not sure.
2. Or, if i should i move the insulation (yellow fiberglass kind), can I create a 4-6" airflow gap between it and the ceiling or does it need to be an attic-like set-up of three feet or whatever?
I am so confused. I know there is also some debate on whether to vent or not to vent but i was assuming that was for houses and structures with attics and attached garages. I know venting is said to extend the life of the roof/shingles and regulate heat and moisture inside the structure. i don't want to go through the time and expense reroofing only to have to do it over again in a short time. I also do not want to create extra expense if work not necessary.I have two conflicting points of views with two different handy men I'm considering contracting.
Last edited by debster; 08-09-2009 at 09:00 PM.