12" width batt insulation - Pirate4x4.Com : 4x4 and Off-Road Forum
 
Pirate4x4.Com : 4x4 and Off-Road Forum  

Go Back   Pirate4x4.Com : 4x4 and Off-Road Forum > General Tech > Shop and Tools
Notices

Reply
 
Share LinkBack Thread Tools Display Modes
Old 02-15-2020, 01:31 PM   #1 (permalink)
Registered User
 
Join Date: Dec 2015
Member # 635241
Posts: 53
12" width batt insulation

My shop was built with a 4/12 pitch and the architect specified the 2x6 rafters be 12" on center due to the high collar tie. Blown in insulation is impractical and spray foam is cost prohibitive.

I have been looking, but can't find anyone that sells a batt or roll insulation that will fit the 11" spacing. Sure, I can get 23" wide and cut it in half, but I'd rather not if 11" wide is readily available and affordable.

Anyone know who makes or sells such and animal in the contiguous USA?
ShutterBug is offline   Reply With Quote Quick reply to this message
Old 02-15-2020, 04:59 PM   #2 (permalink)
Broke Bastard
 
Benny's Avatar
 
Join Date: Jun 2000
Member # 1129
Location: North Idaho
Posts: 4,104
Blog Entries: 1
I have never seen 12" insulation.

What is your plan for venting?
__________________
Every day is better than the next.
Benny is offline   Reply With Quote Quick reply to this message
Sponsored Links
Old 02-15-2020, 05:38 PM   #3 (permalink)
Zeus of the Sluice
 
Join Date: Feb 2003
Member # 17313
Location: Embarrass, mn
Posts: 4,099
blow in cellulose and be done with it
__________________
A recent survay of over 1000 trailer parks in the southeast found the 350 chevy out numbered the mullet by nearly 4:1, draw your own conclusion.
Jrod-13 is offline   Reply With Quote Quick reply to this message
 
Old 02-15-2020, 06:10 PM   #4 (permalink)
Registered User
 
Join Date: Apr 2001
Member # 4243
Location: Westcoast Canuck... eh?
Posts: 5,470
I got 24" OC roxul to fill my 12" OC spaced stud wall. (Yes, cutting every batt.) I may even cut the other way for smaller chunks because I have considerable obstacles and mess to work around.

Got this idea the other day for an attached lean-to-shed area I have to enclose.... how about foam board screwed over the rafters? It would preserve the roof venting, and you can seal the seams with tape or spray foam.
__________________
Dodge cobbler... (1stgen cummins theme)
u2slow is offline   Reply With Quote Quick reply to this message
Old 02-15-2020, 07:22 PM   #5 (permalink)
Registered User
 
clb 017's Avatar
 
Join Date: Aug 2010
Member # 166307
Location: Nannyfornia
Posts: 2,251
Ridgid
__________________
If its made in china IT WILL FAIL!
Phawk photofukkit.
clb 017 is offline   Reply With Quote Quick reply to this message
Old 02-16-2020, 10:40 AM   #6 (permalink)
Registered User
 
Join Date: Dec 2015
Member # 635241
Posts: 53
Quote:
Originally Posted by Benny View Post
I have never seen 12" insulation.

What is your plan for venting?
Um, not pertinent, but I have baffles plus soffit/ridge vents.

Quote:
Originally Posted by Jrod-13 View Post
blow in cellulose and be done with it
smh.

Quote:
Originally Posted by u2slow View Post
I got 24" OC roxul to fill my 12" OC spaced stud wall. (Yes, cutting every batt.) I may even cut the other way for smaller chunks because I have considerable obstacles and mess to work around.
I've thought of this as well. I can easily weld up a rig to squash the insulation enough to make it easy to cut.

Quote:
Originally Posted by u2slow View Post
Got this idea the other day for an attached lean-to-shed area I have to enclose.... how about foam board screwed over the rafters? It would preserve the roof venting, and you can seal the seams with tape or spray foam.
It would have to be too thick to provide the R value I need/want. I'd lose 4" of headroom.

Quote:
Originally Posted by clb 017 View Post
Ridgid
I considered foam board, for about a minute. It's at least 3 times more expensive for the same R value. Which is the same reason I discounted spray foam.

Oh well, I guess I'm going to just have to cut some 24" or 23" batts/rools in half. No big deal. Was hoping to avoid that.
ShutterBug is offline   Reply With Quote Quick reply to this message
Old 02-16-2020, 11:03 AM   #7 (permalink)
Registered User
 
gregj50's Avatar
 
Join Date: Jan 2010
Member # 151818
Location: Roy
Posts: 243
Job site were working now... the guy has a wet crawl space and cant get the floors to dry out for hardwood install... hes basically forced to use the spray foam!!!! Its 3 x the cost of normal fiberglass insulation!!!! But anyone whos been in a crawl space with years old fiberglass insulation knows how fkd that shut can be!!!! Falling down from rodents using it as housing.... then it gets wet... not fun to clean out!!!! I wonder if rodents like the spray foam for residency?????


Sent from my iPhone using Tapatalk
gregj50 is offline   Reply With Quote Quick reply to this message
Old 02-16-2020, 01:48 PM   #8 (permalink)
Registered User
 
Join Date: Jun 2001
Member # 5371
Location: TN
Posts: 34,267
Send a message via MSN to rockota
Quote:
Originally Posted by ShutterBug View Post
My shop was built with a 4/12 pitch and the architect specified the 2x6 rafters be 12" on center due to the high collar tie. Blown in insulation is impractical and spray foam is cost prohibitive.

I have been looking, but can't find anyone that sells a batt or roll insulation that will fit the 11" spacing. Sure, I can get 23" wide and cut it in half, but I'd rather not if 11" wide is readily available and affordable.

Anyone know who makes or sells such and animal in the contiguous USA?
why is blown in "impractical"?
rockota is offline   Reply With Quote Quick reply to this message
Old 02-16-2020, 02:04 PM   #9 (permalink)
Registered User
 
Join Date: Dec 2006
Member # 84339
Location: Flyover land
Posts: 16,134
blown in is good, but if there's anyway to do go spray foam.
__________________
Lugnut4x4.com
And i don't want to give Canadiens any more money, so my sig is broke.
Pt_Ranger_V8 is offline   Reply With Quote Quick reply to this message
Old 02-16-2020, 02:08 PM   #10 (permalink)
Registered User
 
Join Date: Apr 2001
Member # 4243
Location: Westcoast Canuck... eh?
Posts: 5,470
Quote:
Originally Posted by rockota View Post
why is blown in "impractical"?

My guess is OP is insulating between the rafters and collar ties.. not ceiling joists.
__________________
Dodge cobbler... (1stgen cummins theme)
u2slow is offline   Reply With Quote Quick reply to this message
Old 02-16-2020, 03:49 PM   #11 (permalink)
Registered User
 
clb 017's Avatar
 
Join Date: Aug 2010
Member # 166307
Location: Nannyfornia
Posts: 2,251
I considered foam board, for about a minute. It's at least 3 times more expensive for the same R value. Which is the same reason I discounted spray foam.

Oh well, I guess I'm going to just have to cut some 24" or 23" batts/rools in half. No big deal. Was hoping to avoid that.[/QUOTE]

Time vs return...
Cost vs labor...
Or
Time is money.
Your call.
Get it done.
A well known tip for cutting glass batts..
Get a 12+ " serated kitchen knife, place 2x4 across batt where you want to cut and press down on 2x saw along the edge paper up!
__________________
If its made in china IT WILL FAIL!
Phawk photofukkit.

Last edited by clb 017; 02-16-2020 at 03:56 PM.
clb 017 is offline   Reply With Quote Quick reply to this message
Old 02-16-2020, 07:10 PM   #12 (permalink)
Registered User
 
Join Date: Dec 2015
Member # 635241
Posts: 53
Quote:
Originally Posted by Pt_Ranger_V8 View Post
blown in is good, but if there's anyway to do go spray foam.
I don't disagree. I already had someone look at this. Blown in CAN be done, it's just not worth the hassle of trying to get it into all the tight spots.



There's only about 6 inches between the collar tie and the ridge beam. The rafters are about 4 feet to the top of the wall. Beyond the wall is a 2' overhang/soffit.

I'd have to modify that gap to accept the vent baffle, and to ensure that it's not going to let the blown in stuff past. That insulation that's stuffed in there is just there to keep the heat from a propane heater while the concrete floor was curing.

Just too much going on there to make it worthwhile, since I wouldn't get any additional R value.

Spray foam could give me a LOT more R value, but at a huge increase in cost. It's a hobby shop, I don't need it to be a sauna. LOL.

I have had contractors come over and look it over. As I already said, blown in is not practical. Spray foam would be great, just too expensive.

Quote:
Originally Posted by clb 017 View Post
Time vs return...
Cost vs labor...
Or
Time is money.
Your call.
Get it done.
A well known tip for cutting glass batts..
Get a 12+ " serated kitchen knife, place 2x4 across batt where you want to cut and press down on 2x saw along the edge paper up!
My labor is free. Unless I hire someone else. Time is something of which I have plenty.

I'll be cutting batts unless someone wants to make a sizable donation to the spray foam effort.

Last edited by ShutterBug; 02-16-2020 at 07:11 PM.
ShutterBug is offline   Reply With Quote Quick reply to this message
Old 02-16-2020, 07:12 PM   #13 (permalink)
Registered User
 
Join Date: Dec 2015
Member # 635241
Posts: 53
Quote:
Originally Posted by u2slow View Post
My guess is OP is insulating between the rafters and collar ties.. not ceiling joists.
Correct. I have no ceiling joists. Just rafters and collar ties.
ShutterBug is offline   Reply With Quote Quick reply to this message
Old 02-17-2020, 03:41 AM   #14 (permalink)
Pirate4x4 Addict!
 
45acp's Avatar
 
Join Date: Sep 2002
Member # 13671
Location: Texarkana
Posts: 13,309
One thing is for sure... if you ever run out of parking space, you could just build some moveable ramps and park on the roof.
45acp is offline   Reply With Quote Quick reply to this message
Old 02-17-2020, 04:59 AM   #15 (permalink)
Pirate4x4 Addict!
 
PONY_DRIVER's Avatar
 
Join Date: Mar 2005
Member # 44662
Location: In a house!
Posts: 30,234
Why such a low pitch roof? Code? Height restrictions?
__________________
"I'm strangely comfortable with it."
PONY_DRIVER is offline   Reply With Quote Quick reply to this message
Old 02-17-2020, 07:38 AM   #16 (permalink)
Registered User
 
clb 017's Avatar
 
Join Date: Aug 2010
Member # 166307
Location: Nannyfornia
Posts: 2,251
If you use net, you can staple the 1 flange and run across each pitch (side of ridbeboard) MIGHT make life easier...
Then vapor barrier the whole lid.
I see your issue's, you gunna rock this?
__________________
If its made in china IT WILL FAIL!
Phawk photofukkit.
clb 017 is offline   Reply With Quote Quick reply to this message
Old 02-17-2020, 08:29 AM   #17 (permalink)
Registered User
 
Join Date: Dec 2006
Member # 84339
Location: Flyover land
Posts: 16,134
What are you being quoted for spray foam?

Worst case, you just do the bats cut in half.


You do need some sort of venting though.
__________________
Lugnut4x4.com
And i don't want to give Canadiens any more money, so my sig is broke.
Pt_Ranger_V8 is offline   Reply With Quote Quick reply to this message
Old 02-17-2020, 12:31 PM   #18 (permalink)
Registered User
 
Join Date: Apr 2001
Member # 4243
Location: Westcoast Canuck... eh?
Posts: 5,470
Spray foam is going to be a PITA to deal with when its time to redo the roof and the OSB is shot.

4" thick batts between the 2x6's would leave a vent space. Add say 1.5"-2" foam board on the face of the angled area before interior sheathing
__________________
Dodge cobbler... (1stgen cummins theme)
u2slow is offline   Reply With Quote Quick reply to this message
Old 02-17-2020, 06:40 PM   #19 (permalink)
Broke Bastard
 
Benny's Avatar
 
Join Date: Jun 2000
Member # 1129
Location: North Idaho
Posts: 4,104
Blog Entries: 1
How old is this roof system?

You should have just bought scissor trusses. 2' on center, and enough room for venting
__________________
Every day is better than the next.
Benny is offline   Reply With Quote Quick reply to this message
Old 02-17-2020, 09:18 PM   #20 (permalink)
Registered User
 
nate379's Avatar
 
Join Date: Jun 2003
Member # 20099
Location: AK
Posts: 5,507
We had a whole building worth of 12" wide insulation a while back. Came out of a commercial building that was re-reroofed. They had money to waste so tore out all the insulation. Was all 4ft long for some reason.

I'd assume it was purchased like that, but maybe they had a couple laborers making it that size.
nate379 is offline   Reply With Quote Quick reply to this message
Old 02-18-2020, 02:00 AM   #21 (permalink)
gumboot cloggeroo
 
Muckin_Slusher's Avatar
 
Join Date: May 2014
Member # 467233
Location: Ontario, Canada
Posts: 1,846
Are you due for new shingles?

If so, then strip old shingles, lay rigid on top of old sheathing, add another layer of sheathing screwed through to the rafters and re-shingle.

It's called a hot roof and doesn't requite venting.
__________________
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.

-------------------------
Last edited by Muckin_Slusher; Today at 04:47 PM.
Muckin_Slusher is offline   Reply With Quote Quick reply to this message
Old 02-18-2020, 01:52 PM   #22 (permalink)
Registered User
 
Join Date: Dec 2015
Member # 635241
Posts: 53
Quote:
Originally Posted by PONY_DRIVER View Post
Why such a low pitch roof? Code? Height restrictions?
Matches the house and garage. Since the shop roof ties into the garage, the pitch needed to match (ish).

Quote:
Originally Posted by Pt_Ranger_V8 View Post
What are you being quoted for spray foam?

Worst case, you just do the bats cut in half.


You do need some sort of venting though.
$1880 was the quote I got last year. But I don't recall the R value for that. If it was full thickness, I may have to go back and ask the contractor. But I doubt it. Not for 600 square feet of roof.

I plan on cutting batts in half. It's not that big of a deal, figured I would ask.

Soffit vents and ridge vent are already in place. Baffles will go under the sheathing before the insulation is placed.

Quote:
Originally Posted by Benny View Post
How old is this roof system?

You should have just bought scissor trusses. 2' on center, and enough room for venting
A year. Scissor trusses were not practical. This is attached to the back of an existing garage with the same pitch roof. Plus the 2 foot overhang. I would have had to order trusses that exactly matched all of that, and quite frankly, I wasn't going to bother. It was cheaper to buy 2x6's and build it.

Quote:
Originally Posted by Muckin_Slusher View Post
Are you due for new shingles?

If so, then strip old shingles, lay rigid on top of old sheathing, add another layer of sheathing screwed through to the rafters and re-shingle.

It's called a hot roof and doesn't requite venting.
Nope. Brand new addition.


----


Although I appreciate all the commentary on how I should have built my shop - it has absolutely nothing to do with finding 12" wide batts.

The shop was built to look like it had always been there. I still have a few details to finish the inside namely a few more circuits in the panel, lighting, insulation, plywood for the walls, and the ceiling - I'm leaning towards interior barn siding, 3' wide with 9" spaced ribs. I think it would look cool and would reflect a lot of light.

Some of you seem to be interested, so here it is from the outside:





ShutterBug is offline   Reply With Quote Quick reply to this message
Old 02-18-2020, 06:34 PM   #23 (permalink)
Pirate4x4 Addict!
 
45acp's Avatar
 
Join Date: Sep 2002
Member # 13671
Location: Texarkana
Posts: 13,309
Looks good. I'd saw batts in half and be done with it. Maybe I missed it, but what are the ceiling plans?
45acp is offline   Reply With Quote Quick reply to this message
Old 02-18-2020, 08:07 PM   #24 (permalink)
Registered User
 
Join Date: Dec 2015
Member # 635241
Posts: 53
Quote:
Originally Posted by 45acp View Post
Looks good. I'd saw batts in half and be done with it. Maybe I missed it, but what are the ceiling plans?
I'm looking at using interior barn siding. Because of the break in the ceiling, I am thinking a couple of faux beams down the length. Drywall being my fall back.

Not my picture:

ShutterBug is offline   Reply With Quote Quick reply to this message
Old 02-18-2020, 10:05 PM   #25 (permalink)
Registered User
 
nate379's Avatar
 
Join Date: Jun 2003
Member # 20099
Location: AK
Posts: 5,507
That's a shop?

Looks like a house garage or shed.
nate379 is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Pirate4x4.Com : 4x4 and Off-Road Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.

** A VERIFICATION EMAIL IS SENT TO THIS ADDRESS TO COMPLETE REGISTRATION!! **

Email Address:
Insurance
Please select your insurance company (Optional)

Log-in


Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 04:43 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0 ©2011, Crawlability, Inc.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.