Laying batt FG insulation over attic floor

rlandry · 12-09-2011, 09:23 PM

Small (900sf) house in Tennessee has no insulation under plywood flooring over joists. Started laying batt FB (w/ vapor barrier) insulation between joists behind knee walls. Don't want to pull up plywood flooring.

Thinking of just laying batt FB insulation directly over plywood flooring.

Question: Should I use a vapor barrier directly over plywood floor or just use insulation w/o vapor barrier?

Windows on Wash · 12-10-2011, 10:44 AM

Is the floor you are describing over a crawlspace? I think you have some of your terminology mixed up.

Can you post up a picture?

joecaption · 12-10-2011, 10:53 AM

Joist are under the house and rafters are what holds up the ceiling, is that what you ment to say?

rlandry · 12-10-2011, 11:12 AM

Sorry for sloppy terminology. I'm inquiring about an attic space. House is wood frame with gable roof. Wood rafters over attic. Plywood flooring in attic over 2x6 wood ceiling joists.

Attic is not being used for storage, so covering floor with batt or loose insulation is an option we're looking at.

Question is if we should lay down a vapor barrier over existing plywood flooring if no insulation/vapor barrier is between ceiling joists.

12-09-2011, 09:23 PM	#1
rlandry Newbie Join Date: Dec 2011 Location: Austin, Texas Posts: 2	Laying batt FG insulation over attic floor Small (900sf) house in Tennessee has no insulation under plywood flooring over joists. Started laying batt FB (w/ vapor barrier) insulation between joists behind knee walls. Don't want to pull up plywood flooring. Thinking of just laying batt FB insulation directly over plywood flooring. Question: Should I use a vapor barrier directly over plywood floor or just use insulation w/o vapor barrier?

12-10-2011, 10:44 AM	#2
Windows on Wash Exterior Construction Join Date: Aug 2011 Location: VA, MD, DC Posts: 3,848	Laying batt FG insulation over attic floor Is the floor you are describing over a crawlspace? I think you have some of your terminology mixed up. Can you post up a picture? __________________ To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

12-10-2011, 10:53 AM	#3
joecaption Member Join Date: Nov 2011 Location: Hartfield VA Posts: 18,822	Laying batt FG insulation over attic floor Joist are under the house and rafters are what holds up the ceiling, is that what you ment to say?

12-10-2011, 11:12 AM	#4
rlandry Newbie Join Date: Dec 2011 Location: Austin, Texas Posts: 2	Laying batt FG insulation over attic floor Sorry for sloppy terminology. I'm inquiring about an attic space. House is wood frame with gable roof. Wood rafters over attic. Plywood flooring in attic over 2x6 wood ceiling joists. Attic is not being used for storage, so covering floor with batt or loose insulation is an option we're looking at. Question is if we should lay down a vapor barrier over existing plywood flooring if no insulation/vapor barrier is between ceiling joists.

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Laying batt FG insulation over attic floor