Basements, Attics and Crawl Spaces - Vaulted Ceiling Insulation
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09-22-00, 07:08 AM
When finishing an unused space in my house, I neglectedt to provide for airflow between the roof sheeting and insulation. Now, seeing the error of my ways, I know I need to get some airflow back from the soffit to the ridge vent. Only one catch, the room is now finished.
I can access most of the area from both the soffit and ridge vent sides. The non-vented insulated area is about 6-8 feet in most spots. Any suggestions as to materials or techniques I can use to get some ventilation back?
jcg
I can access most of the area from both the soffit and ridge vent sides. The non-vented insulated area is about 6-8 feet in most spots. Any suggestions as to materials or techniques I can use to get some ventilation back?
jcg
09-22-00, 01:13 PM
I encountered the same exact situation in my last home. It as doiscovered when the built-up condensation warped and delaminated a piece of roof sheathing.
The only suggestion I got was to install the styrofoam channels when the roofing got replaced about 5 years down the road.
I assume you cannot just insert the styrofoam channels.
So, what I did was to open up the eaves from the soffit, and simply shove a long PVC pipe (1.5" diameter) between each pair of rafters and between the fiberglass and roof. The pipes were cut as long as the rafters, basically, and the purpose of the pipe was to slightly compress the fiberglass to permit air to flow from the soffit vents to the ridge above. You could even perforate the pipe to add circulation. I know its not optimal becauuse the insulation will compress over time, but decided to sacrifice some R-value to obtain the needed ventilation. Crude but effective. Then once the roof gets redone, I'd replace with the channels.
Good luck.
The only suggestion I got was to install the styrofoam channels when the roofing got replaced about 5 years down the road.
I assume you cannot just insert the styrofoam channels.
So, what I did was to open up the eaves from the soffit, and simply shove a long PVC pipe (1.5" diameter) between each pair of rafters and between the fiberglass and roof. The pipes were cut as long as the rafters, basically, and the purpose of the pipe was to slightly compress the fiberglass to permit air to flow from the soffit vents to the ridge above. You could even perforate the pipe to add circulation. I know its not optimal becauuse the insulation will compress over time, but decided to sacrifice some R-value to obtain the needed ventilation. Crude but effective. Then once the roof gets redone, I'd replace with the channels.
Good luck.