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ceiling insulation and drywall


jimmyruss's Avatar
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03-24-05, 09:44 AM   #1  
ceiling insulation and drywall

I am closing in my gargage ceiling with insulation and drywall up to the ceiling joists but I want to do this up to the roof rafters on 1/3 of the length of the gargage for a catheral effect. There are 8 cells that will completely be closed in and I was wondering if it will be necessary to ventilate them and/or install a radiant barrier in each one? thanks

 
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coops28's Avatar
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03-24-05, 12:41 PM   #2  
Definitely need ventilation. Make sure you have soffit vents on the outside. Use those styrofome panels that keep the insulation from the roof and make room for air.

 
jimmyruss's Avatar
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03-24-05, 01:02 PM   #3  
Wall And Ceiling Insulation

Is it necessary to have ridge vents or will the soffits be enough?

 
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03-25-05, 06:18 AM   #4  
you need an exhaust

Posted By: jimmyruss Is it necessary to have ridge vents or will the soffits be enough?
Soffit vents are intake vents. Now you need an out vent up high for a good airflow. Choices in exhaust ventilation are much wider than intake, ridge vent will work if you have a decent length ridge line.

 
Ed Imeduc's Avatar
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03-25-05, 07:00 AM   #5  
The books call for 1sqft of vent for 150sq ft of attic. 1/2 in and a 1/2 out. Use button vents up near the ridge. Code here dont want ridge vents any more. Rain water blowes in. Attic ventfan worth it works on a tstat Attic sq ft X 0.7=CFM. Also make sure you have the foam rafter vents so air can get up into the attic from the over hang vents. Over the insulation. You could make a small drop ceiling near the ridge with just some collar beams. this you can vent with gable vents?????

ED

 
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