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Discussion Starter #1
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?
 

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blow in cellulose and be done with it
 

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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. :homer:

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.
 

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Discussion Starter #6
I have never seen 12" insulation.

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

blow in cellulose and be done with it
smh.

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. :homer:
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.

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.

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.
 

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Job site we’re working now... the guy has a wet crawl space and can’t get the floors to dry out for hardwood install... he’s basically forced to use the spray foam!!!! It’s 3 x the cost of normal fiberglass insulation!!!! But anyone who’s 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?????


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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"?
 

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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!
 

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Discussion Starter #12 (Edited)
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.

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. ;)
 

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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. :eek:
 

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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?
 

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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.
 

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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
 

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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.
 
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