garage insulation

[moparguy01]

I'm sure this has been covered but I didn't find what I'm looking for with the search, so I apologize in advance.

I have a 26x40 3 stall garage that is currently not insulated. The walls are very straight forward, I'll be using R15 rolls and sheetrocking them. I may use plywood instead for strength, but I'm not sure on that yet.

The ceiling however is a different animal. 2 of the stalls were an addition later in the houses's life. The first stall has 4' OC spacing for the trusses. Then it has 2 end trusses back to back, and 2' OC spacing for the remainder of the garage. This leaves me with just a couple options.

Spray foaming the sheathing up top. Leaves the ceiling open, but with the quotes I got of 3800 and 4500, I can't justify that. Or I sheetorck the ceiling and use cellulose blow in or fiberglass. If I sheetrock the ceiling, I can either run straps across the rafters to give me a screwing surface, or cut 2x4's to fit the width of the spacing and nail it flush with the bottom of the trusses.

My concern is with the 4' OC portion of the roof. I don't want to overload the trusses and I'm not sure if the weight of the sheetrock and insulation will put a strain on the roof. I live in Minnesota so we get a good amount of snow.

Does anybody have any input on something like this?

Thanks!

 

[Falcon67]

Drywall and/or OSB puts less than 2 lbs sq/ft load on the lower part of the trusses. Most of the plans I have seen for truss construction allow around 5. At any rate, furring strips and drywall + blown in should not put that much load on the cords. You can also add in joists in between the 4' OC units to support the ceiling panels.

 

[mcfly107]

I went with the add a joist solution to bring mine to 24 OC. Then went with drywall for the ceiling. I'm kicking myself for not doing plywood on the walls.


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[TractorJeff]

Why not the sheetrock? Why do you wish for plywood?
Mine is in the in-between stage and I was planning on using sheetrock.

 

[dfiler2]

Just another thought, use white metal, called panel liner. You can have it ordered to the exact dimensions it goes up really quick, you can span 4' (although I would probably add a bottom cord at 24") you don't have to tape it or paint it and you can blow the insulation on top of it. Here is a pic of mine and a link to the metal at Menards.

 

[kj_mustang]

Metal ceilings are the cheapest and easiest ways to do a 4' truss spaced ceiling. I used it on mine and did not add any extra strapping.

 

[Dragfluid]

Yup,,,,,,,,, steel panels and fill er up with cellulose!

 

[Mike99]

I insulated my 2 car garage 14 years ago and really wish I had used plywood. My buddy did his in plywood around the same time and it looks great. Live and learn. Makes it alot easier to hang stuff up on the wall without searching for studs. I cant count how many times the wife has opened the car door into the wall. Slowly disintigrating.

 

[Mike99]

In my neck of the woods 1/2 inch plywood is about double the price of drywall. So I saved a couple hundred bucks by using drywall. Big woop.

 

[Dragfluid]

I insulated my 2 car garage 14 years ago and really wish I had used plywood. My buddy did his in plywood around the same time and it looks great. Live and learn. Makes it alot easier to hang stuff up on the wall without searching for studs. I cant count how many times the wife has opened the car door into the wall. Slowly disintigrating.

I put plywood on the first 24" from the floor. Then the rest drywall.

 

[moparguy01]

I had not thought about metal panels. I'm liking that idea. Bright white and no taping!

If I use the metal panels for the ceiling though, wouldn't I still need to add strapping to support it if I'm blowing cellulose on top of it?

I was thinking plywood for the walls to have it a bit tougher since I'm always working in it. Also it makes it easier to put hooks and things up since it doesn't need to be in a stud necessarily (for light things)

Thanks for all the help guys!

 

[Dragfluid]

My trusses are 8' on center, so I added 2x4 trusses ever 48" for the steel panels. On top of that is 19" of cellulose. It will settle down a couple inches eventually for a nice R60+. I had checked with the panel manufacturer, and that's what they told me would work.