Decking over attic insulation?


  #1  
Old 10-23-15, 09:58 AM
T
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Decking over attic insulation?

Presently my attic has vermiculite filled only to the top of the rafters. I would like to add fiberglass roll or batt but am considering installing board decking to the rafters first. Reason mainly for walking access during and after adding the glass. The home furnace and all ducts are in the attic so good access is needed. I am thinking of having gaps between the boards for ventilation. Any experience or problems with this? Thanks, Trends
 
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Old 10-23-15, 11:03 AM
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Welcome to the forums.

I would only put down as much decking as you need to get to the furnace.
 
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Old 10-23-15, 02:17 PM
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Use blown in instead of batts.
Make sure the attic was air sealed, add baffles so you do not block the soffit vents.
Your area calls for R 50 to R 60, which is about 12".
 
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Old 10-23-15, 03:07 PM
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Have you determined whether that vermiculite is free of asbestos? If it does have asbestos and you wanted to have it professionally removed, now would be better than after the new insulation is installed.

Bud
 
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Old 10-23-15, 03:22 PM
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If it did test positive, removing it would cause far more harm then leaving it and covering it up.
Undisturbed and covered up it's not going to hurt anyone.
 
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Old 10-29-15, 06:44 PM
T
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Thanks all for your responses. I understand that in the past some vermiculute was contaminated with asbestos, but I'm reasonably sure that the currently available stuff is OK. Mine is from Menard's. I guess I just prefer working with batts: it suits my extra slow, but sure approach. And I'll minimize the access decking. Thanks again, Trends
 
 

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