Spray foam for garage?

[torredcuda]

I have a 2 car detached steel garage building I need to insulate and sheetrock so I can heat this winter and since th ewalls are thin, only 2 1/2" steel rectangle tubing I`m thinking foam will give me a better R value than fiberglass. Is foam a good idea and has anyone used a DIY kit, how easy was it?

https://www.lowes.com/pd/Dow-FROTH-PAK-620-Sealant-Foam-Insulation-Kit/999972978

[realn96]

I used it in a few  walls in my home when I was remodeling.  I feel its better insulation when you are dealing with just  2 1/2 " . I have 2x4 walls and wanted more then just r12. I used a kit very similar to the kit you show. As far as easy goes? yes very easy . Just cover the floors !

[RJChallenger]

It's not the R-value that is important here. Spray foam is a air flow sealer , that stops heat escaping from inside the building. If you use regular insulation you will need a vapor barrier. Spray foam may be more $$$, but for better results

[captcolour]

That seems pretty expensive to do an entire building.  Garage doors are a big part of your building with low R value to start with.  Same if you have any windows.  I would look at payback.  You may save some money in heating, but I'd guess payback is 10+ years for this spray foam.  May be better to use the foam in cans to seal any gaps and then just use regular fiberglass or the white backed rolls. The white backed on the ceiling will make it brighter inside.

[cuda hunter]

I just completed a 6000 sq.ft.  home.  I spray foamed the entire roof.  Against the plywood and against the gables. 
I pulled an R 60 out of the roof.  My walls are R55 made of I.C.F. 42' tall. 

The Foam is by far the best option you have on the market for both sealing the property and holding your heat and cold.
In the Summer the cool gain is amazing.  It will typically keep a 60* interior.   Actually it tends to keep that temp in the cold winter as well. 

I use spray foam on any 2x4 walled remodel I ever touch.  We aren't allowed 2x4 walls any more so when I do a 2x6 wall what i use is a Hybrid system.

The walls get sprayed with foam 4" thick.  Then we bib the interior side of the stud bay and install spun glass on top of the foam.
This gives an incredible R value for a 2x6 wall.

On metal buildings, Spray foam is the way to go.  But let me say that in my opinion of using foams for 20 plus years, hire a professional. You will get better coverage It will be done quicker.  it will cost you a little extra. 

Another thing to consider is that you would want to use closed cell foam and not open cell foam.  Open cell foam can hold moisture as well as let moisture pass through the cells.  Not suggested for a garage or anything that is going to have any moisture.  The closed cell will also seal up the roof so if a water leak starts, it can only get to the foam.  will not pass through.

The 6K sq.ft. home I just built cost 36 thousand for the insulation package.   Well worth it. 

[Brads70]

Just wondering out loud.... what about fire rating? In a garage I'd expect welding, grinding sparks etc...  The other thought that crosses my mind is in 20 years or whatever are they going to find out it's a health hazard like asbestos was/is? Then costing big bucks to get rid of it?  Again I have zero experience, just asking/thinking out loud?   

[JS29]

Rodents don't like foam, but they love fiberglass mat insulation. 

[RUNCHARGER]

I think this stuff is the way to go too.

[cuda hunter]

Doesn't burn.  Will melt but doesn't ignite. 

  There is a lot of debate about off gassing.  Talk to all the reps and they say, NO.  there is no off gassing.  It's not that big a deal.
Same thing comes from the reps of I.C.F.  blocks.  Foxblock and nudura are what I use.

Rodents do not like it at all. 

Moisture resistant, fire resistant, rodent resistant. 

It will make your garage too tight.  I have this problem on homes I build.  Have to put in an HRV system typically.  But a window that will open is all you need in a garage. 

[cuda hunter]

couple pics of the foam in the attic.

[cuda hunter]

Behind the hand scalloped post you can see the hybrid system on the ceiling.  9" of foam and 3" of woven glass.
Also see the standard insulation in the walls and fireproof insulation on the fireplace. 

Sorry if these pics are boring and kind of not what your talking about but they all go together in the insulation talk.

[torredcuda]

Walls and ceiling will be sheetrocked after insulation so no worry about sparks

[torredcuda]

So far I have one estimate around $2500 which is why I figured I could do it myself.

[cuda hunter]

Well worth having them do it.  Big differences between diy and pros. 

[cuda hunter]

The pros will show up with a trailer and 50 gallon barrels of the mixes.  They will use a hose that costs in the 10K range.
The diy stuff is in a container.  Doesn't cover as much as they say, Will have improper mixes.  And is a pain to work with.  I've done it both ways and I try to do as much stuff as I can as I am the general and it saves me and my clients money.
But with this one, let the pros do it.