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Discussion Starter #1
I have a metal garage like this.




I want to insulate it. I am going to use osb on the walls and put blown in insulation behind it. I had planned on making a drop ceiling from dry wall and putting insulation above that. Untill yesterday. I went into the garage and the roof was sweating. Now I don't know what I am going to do. I don't want to put something up there and have it get wet and ruined. Also I have to get rid of the moisture before all my stuff in there starts rusting. Anyone have any ideas?
 

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wonder if foam board insulation would be better that situation...and I would put a vent in the gable end
 

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I would go with the foam board idea as well, blown in insulation directly against the metal would be a bad idea... the vent will be a necessity if your insulating otherwise condensation will be a major issue for sure. This is the time of year when you would see it the worst as it is so cold in the am and with potential for nice sunny days to rapidly heat the building....I had issues in my house until I put some better ventilation in and that seemed to do the trick.
 

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you might want to look into spray foam insulation. just watched a show yesterday that did this inside a house. there would be no chance of moisture build up so no rust
 

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Discussion Starter #5
I got an estimate for the spray on insulation. It is expensive. $1250 for just the roof and $2500 for the roof and walls. I'm going to have them do the roof and walls.
 

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Discussion Starter #8
Ron that is all it is getting. After the insulation is put on I am going to put osb on the walls.
 

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There are kits to do spray insulation yourself. Will save a lot on the cost / labor mark up.
 

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All the kits I've priced out have been more than the local sprayers cost...plus then you would need to learn to use the equipment and make a mess of yourself. Spray foam is the best option a little on the pricey side but very very efficient.
 

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Spray foam is the best option. The cost usually cost 2.5 times the cost of traditional fiberglass.I dont know the thickness of your metal studs but anything over 3 inches of foam is a waste of meterial. Kits are a way of saving a couple dollars if you can use it correctly. Spray foam expands a VERY large amount and spraying too much anywhere will result in alot of cutoff and waste. After it is installed, the garage could be heated with a candlestick. Run conduit lines throughout various areas in the garage for future elctric work. For walls thin OSB or drywall would be the best bet. Along with the R value of the foam, It keeps and airtight seal that keeps out insects and unwanted pests.
 

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Discussion Starter #12
The studs are 2 1/2 inches. The bad part is they are not 48 inches a part. They are 49 inches center to center. So we going to have to put some 2x4's in to get it to work. The foam will be 2 inches thick.
 

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2 inches will net something like 14 R but its close to 95% efficiency as far as air penetration (or lack there of)... like dstewart said you could heat your building with a candlestick...I have it in the upstairs of my home and when I was putting drywall up in winter the room was being heated by the halogen lamps we were using. awesome product
 

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I wouldn't use foam board. Bugs love foam boards. Spray is a good way to go. For the ceiling, drop would work, but i might try to cut vents in so it can breath. I might even hook up a fan to keep the moisture out if you want to get fancy.
 

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The only problem with the spray insulation is when the roofs leaks, which it will, it is almost impossible to find the leak. Our dirt bike shop has spray foam on the ceiling. It leaks in 5 spots, going to have to silicone every screw head to have a chance at sealing it.
 
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