Forums | Home Repair | Home Improvement | Painting | Interior Decorating | Remodeling | Landscaping

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction


Thread Tools Search this Thread Display Modes
Old 06-29-2012, 07:56 PM   #1
Join Date: Jun 2012
Posts: 2
Share |

Furring out rafters

We are finishing our attic, making it a living space. The rafters are 2x4's, 24 on center. In order to get a high enough R value and have ventilation space behind the insulation we need to furr out the rafters. We are planning on using 2x4's to get to an R20. We were advised to attatch them with construction adhesive and screws. Can anyone point me to or give me a better description of exactly how to do this?
Kjl3694 is offline   Reply With Quote
Old 06-29-2012, 08:15 PM   #2
Renovations contractor
Bonzai's Avatar
Join Date: Oct 2010
Location: Squamish, BC - Canada
Posts: 324

Furring out rafters
Home Renovations & Repairs

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Vancouver to Whistler & beyond
Bonzai is offline   Reply With Quote
Old 06-29-2012, 09:34 PM   #3
Join Date: Nov 2011
Location: Hartfield VA
Posts: 24,516

Furring out rafters

I'm confused how would there be room for foam baffles for ventalation, (about 1-1/2") and R19 insulation which is about 6" thick fit in a 5" space?
joecaption is online now   Reply With Quote
The Following User Says Thank You to joecaption For This Useful Post:
GBrackins (06-29-2012)
Old 06-30-2012, 06:46 AM   #4
Join Date: Jun 2012
Posts: 2

Furring out rafters

Originally Posted by joecaption View Post
I'm confused how would there be room for foam baffles for ventalation, (about 1-1/2") and R19 insulation which is about 6" thick fit in a 5" space?
The house is over 100 years old, the rafters are true 2x4's. Adding 31/2" to the existing 4" rafter will give me enough room for 51/2" high density roll R20 and give me 2" for ventilation.

The linked article talked about using furring strips. I'm looking to use 2x4's i'm having a hard time imagining I'm supposed to drive a nail through that and into the rafter? We may also go to 2x6's so that we can get to R30. How much differance would we notice by upping to that R value?
Kjl3694 is offline   Reply With Quote
Old 07-01-2012, 09:57 AM   #5
Join Date: Apr 2012
Location: Durham NC
Posts: 1,561

Furring out rafters

a 2x6 would be better regarding insulation value for sure. You will have fire block issues at the bottom of the fur strip because it will extend/plane the ceiling level down into the open wall cavity area. The regular wall top plate design in a wall system is what I'm referring to. You will need to add the correct wall blocking in the wall at the new ceiling height, just emulate the top plate design. I would add/nail 9" 2x4 blocks onto the side of existing rafters and then use the 2x4 blocks to nail the fur strips to along with a good nail connection up at the roof ridge and down at the wall. consider adding a flat section at the top of the ceiling to serve as collar ties to help hold everything together as well.
hand drive is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
The Hows and Whys of Furring Strips. Part-1 Willie T How To Guides 12 03-01-2013 02:58 PM
Furring out existing 2x6 rafters kirylm Building & Construction 27 02-13-2012 10:10 PM
checking the rafters joefromcal Carpentry 3 10-01-2010 08:12 AM
What size screws for furring strips on rafters TomFl Building & Construction 1 03-15-2010 07:59 PM

Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.