attaching new floor joists

Cliffrock · 10-13-2011, 11:24 AM

I need to attach 2x12's to the ceiling joists (floor joists in the attic) to allow for 18" of insulation to be blown in. I'm going to be putting floor boards over it all when it's done so it can still be useable space. What would be the best way to attach them? and would 24" on center be sufficient?

moneymgmt · 10-13-2011, 12:23 PM

I assume it is unfinished space now. What is there now.... 2x8's? Are you trying to go parallel or perpendicular to the current joists? what is the spacing of the current joists? I wouldn't assume that simply stacking boards will thereby increase the load capacity to make it a finished area if it wasn't designed to be.

Cliffrock · 10-13-2011, 09:40 PM

It's a previously poorly finished space. I'm tearing out all the drywall and insulation and they used decking boards for a floor. So I'm tearing those up and want to run the 2x12's perpendicular to the 2x6's that are there. they hold weight fine. There was outlets and lights up there so I'm sure the previous owner used it as a living space. They are 16'' OC.

Ron6519 · 10-13-2011, 11:28 PM

Did you entertain any other way to get the insulation value without all the added weight?
Wouldn't a closed cell foam get you where you want to go without all the framing?

Oh-Fudge · 10-14-2011, 02:59 PM

Man, that must be one tall attic if you can lose 12" of ceiling height and still make it livable space! (or, perhaps, you are one of the 'little people' from the Emerald Isle)

Gary in WA · 10-14-2011, 10:11 PM

I would run the proper sized joists parallel with the existing joists, on top of (since they are resting on bearing walls below), after adding a bearing plate and rim which also keeps the existing joists from rotating in place. Run perpendicular, the existing ceiling joists would take the full dead load for which they were not intended/possibly rated.

What will be the end use of the floor? Living space, storage, etc.?

Gary

Cliffrock · 10-14-2011, 11:59 PM

the current ceiling in the attic is 7'. The area I want to insulate will be used only for storage (decorations, camping gear, ect...) I'll look into closed cell foam. Thanks.

Gary in WA · 10-15-2011, 02:51 PM

For others interested in attic storage and Code: http://docs.google.com/viewer?a=v&q=...1txlzU01V4JQIg

Gary

ChantellWilson · 10-17-2011, 10:50 PM

how tricky is it to put floating wood floors on to top of existing floorboards? The ones in our main room, kitchen and dining room are in a shocking state and different colours, and the same as yours have been described - a bit sloping, dippy and bouncy. I was even tossing up putting carpet down, but i love the wooden floor board look. I am just not sure whether to address the boards as they are or cover them... I can't do anything until after our house gets lifted and restumped (which hopefully will be soon!).

Thanks
Regards
Chantell Wilson

10-13-2011, 11:24 AM	#1
Cliffrock Newbie Join Date: Aug 2011 Posts: 14 Rewards Points: 10 View Cliffrock's Album	attaching new floor joists I need to attach 2x12's to the ceiling joists (floor joists in the attic) to allow for 18" of insulation to be blown in. I'm going to be putting floor boards over it all when it's done so it can still be useable space. What would be the best way to attach them? and would 24" on center be sufficient?

10-13-2011, 11:28 PM	#4
Ron6519 Member Join Date: Mar 2007 Location: Long Island, NY Posts: 11,194 Rewards Points: 5,348 View Ron6519's Album	Did you entertain any other way to get the insulation value without all the added weight? Wouldn't a closed cell foam get you where you want to go without all the framing? __________________ Ron "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." B. Franklin 1759

10-14-2011, 10:11 PM	#6
Gary in WA Registered User Join Date: Mar 2009 Posts: 11,730 Rewards Points: 526 View Gary in WA's Album	I would run the proper sized joists parallel with the existing joists, on top of (since they are resting on bearing walls below), after adding a bearing plate and rim which also keeps the existing joists from rotating in place. Run perpendicular, the existing ceiling joists would take the full dead load for which they were not intended/possibly rated. What will be the end use of the floor? Living space, storage, etc.? Gary __________________ If any ads are present below my answer or words underlined/colored, I do not condone/support/use the product or services listed/linked to, they are there without my consent. 17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?

10-15-2011, 02:51 PM	#8
Gary in WA Registered User Join Date: Mar 2009 Posts: 11,730 Rewards Points: 526 View Gary in WA's Album	For others interested in attic storage and Code: http://docs.google.com/viewer?a=v&q=...1txlzU01V4JQIg Gary __________________ If any ads are present below my answer or words underlined/colored, I do not condone/support/use the product or services listed/linked to, they are there without my consent. 17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?

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10-13-2011, 12:23 PM	#2
moneymgmt Member Join Date: Apr 2007 Location: Fenton, MI Posts: 489 Rewards Points: 292 View moneymgmt's Album	I assume it is unfinished space now. What is there now.... 2x8's? Are you trying to go parallel or perpendicular to the current joists? what is the spacing of the current joists? I wouldn't assume that simply stacking boards will thereby increase the load capacity to make it a finished area if it wasn't designed to be.

10-13-2011, 09:40 PM	#3
Cliffrock Newbie Join Date: Aug 2011 Posts: 14 Rewards Points: 10 View Cliffrock's Album	It's a previously poorly finished space. I'm tearing out all the drywall and insulation and they used decking boards for a floor. So I'm tearing those up and want to run the 2x12's perpendicular to the 2x6's that are there. they hold weight fine. There was outlets and lights up there so I'm sure the previous owner used it as a living space. They are 16'' OC.

10-14-2011, 02:59 PM	#5
Oh-Fudge Is this wire Hot? Join Date: Sep 2011 Location: Chesapeake Bay Posts: 187 Rewards Points: 170 View Oh-Fudge's Album	Man, that must be one tall attic if you can lose 12" of ceiling height and still make it livable space! (or, perhaps, you are one of the 'little people' from the Emerald Isle)

10-14-2011, 11:59 PM	#7
Cliffrock Newbie Join Date: Aug 2011 Posts: 14 Rewards Points: 10 View Cliffrock's Album	the current ceiling in the attic is 7'. The area I want to insulate will be used only for storage (decorations, camping gear, ect...) I'll look into closed cell foam. Thanks.

10-17-2011, 10:50 PM	#9
ChantellWilson Newbie Join Date: Oct 2011 Posts: 10 Rewards Points: 10 View ChantellWilson's Album	how tricky is it to put floating wood floors on to top of existing floorboards? The ones in our main room, kitchen and dining room are in a shocking state and different colours, and the same as yours have been described - a bit sloping, dippy and bouncy. I was even tossing up putting carpet down, but i love the wooden floor board look. I am just not sure whether to address the boards as they are or cover them... I can't do anything until after our house gets lifted and restumped (which hopefully will be soon!). Thanks Regards Chantell Wilson

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