Insulation above garage - slowing down heat transfer

[strandedpirate]

I just insulated my garage door and it definitely prevents heat from radiating into the garage when the sun is shining on the garage door in the mornings. This makes the space stay cooler for much longer than before. (I don't have a/c in the garage and not sure if I ever will, see HOA.)

I'm wondering if adding attic insulation will have the same affect and slow down the heat radiating in from the attic?

I know I can't prevent the heat eventually coming in without an A/C, I'm just looking to slow the heat transfer down so that the garage stays as cool as possible during the mornings.

It will only cost $155 for all the insulation I need so its very affordable.

 

[pattenp]

You'll be pleasantly surprised how much the attic insulation helps.

 

[Ronzzr11]

I just read this on another post that might help you decide: "Around here, an uninsulated garage will be air temperature in winter (-30 degrees), and around 130 degrees in summer. An insulated garage will be around +10 in winter and 80 in summer.
Which one would you rather attempt to heat or cool?".

Ron

 

[CNGsaves]

Welcome to GJ. Gameplan to insulating garage depends largely on location. This in Brazil or Antarctica?? What temperature to you want it to be??

 

[vern1]

Sounds like we both have the same issue (I have the other thread going) but maybe opposite problems....in Canada we welcome the sun so I am just worried about freezing to death in the winter

 

[The Frisco Kid]

I'm planning to insulate this winter! Just too easy to put it in there and it's not very pricey.


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[netbrad]

What kit/material did you use and how big is your door?

 

[Falcon67]

I have R13 in my shop attic because I was lazy and cheap. It's October here, so we're cooling down which here means it's been in the mid 90s all week. Temp inside 80F. It can get in the high 80s with no AC running during the summer when underside of the roof deck is running 120F. Worth every penny and the more the merrier. In the winter with no heat running it can get high 40s/low 50s during a week in the 20/30s. If I set the 17K BTU heater on LO so it cycles maybe 4 times/hr it'll be 60+ in there.

 

[Alexbn921]

I just put r13 over my garage and did the walls too. It made a huge 20 degree difference. Helped keep the house cooler too.

 

[shannonw]

Insulate. Neighbor (in florida ) had it blown in. With an insulated door he keeps the garage cool with no problems in the middle of summer.

i'm planning to have it blown up there too.

 

[strandedpirate]

Thanks all, I bit the bullet and bought R-30 insulation. We'll see if it works out in my favor. Lowes is having a sale on R-30 insulation through 10/7 and I couldn't pass it up. Bought 20 rolls of that too to improve the R-value in other parts of the house that get too hot as well.

 

[strandedpirate]

What kit/material did you use and how big is your door?

My door is 7x16 metal sectional and I used R-Matte Plus 3 R-5.0 from Home Depot. I used small dabs of Liquid Nails for Projects to glue it in per their documentation. I wound up using my pressure washer to clean the entire inside and outside of the door and gets years of gunk and saw dust off the hinges before installing the foam.

If I did it all over again I'd probably find a shop that sells a full one inch or inch and a half of this stuff to get a higher R-value. It would be even more difficult to install but worth it.

If you add foam to your door it's going to add 5-15 pounds to the door weight and if your interested in adjusting the springs on the door yourself to re-balance it, like I was, then you must watch this video several times, then watch it again, and one more time after that to be on the safe side. Of all the power tools and crazy stuff I've messed with over the years, nothing made me clench harder than messing with garage door springs but I did it and came out with both hands intact not to mention I saved $100.