Cheetah Posted March 27, 2015 Share Posted March 27, 2015 Hello Everyone,I have a large 3-car attached garage with concrete floor that I am going to insulate and rock this summer. I am also considering adding nat gas heat as well after I get some estimates back on that. It is 2x4 construction walls and I am wondering if I should stick with that, or fir them to be 2x6 thickness so I can have better insulation?Thanks. Quote Link to comment Share on other sites More sharing options...
Scott K Posted March 27, 2015 Share Posted March 27, 2015 If you plan on heating it to 72 degrees year around, then it may pay off to have 6 inch. But if you are just planning on keeping it to 50 most of the time, and crank it to 70 when you are in there a few nights a week, it wouldnt be worth the time or money. Mine has 2x4 walls, I leave mine at 50, except when I am in there maybe 10 hours a week, and my gas bill is maybe $10 higher a month, compared to having the heater off. You may have plans on an air condition in there as well, so it may help with your cooling bill, but I dont condition mine, I just open the doors. Quote Link to comment Share on other sites More sharing options...
Todd S. Posted March 27, 2015 Share Posted March 27, 2015 I just insulated the 2 x 4 wall, I think it was r19, can't remember for sure, it was the most R value I could find for 2 x 4 walls. It warms up quickly and stays warm with garage furnace, I keep it at 50 in the winter, I blew in the attic insulation. I also added two ceiling fans in my garage that help with pushing the heat back down. Quote Link to comment Share on other sites More sharing options...
PurpleFloyd Posted March 27, 2015 Share Posted March 27, 2015 For the time and money you would spend firring it out you could just have it spray foamed and have more r value without losing any interior space Quote Link to comment Share on other sites More sharing options...
BoxMN Posted March 30, 2015 Share Posted March 30, 2015 My garage has 2x4 walls and I think the highest r glass insulation I could find was r15. I keep it at about 34-36ish, just high enough to keep from freezing in winter, but can be cranked to 70 in short order. Biggest loss will be around your doors. I used 2" quality insulated steel doors and try to keep no gaps. Also built a little rigid foam "house" over my attic door. I will say this, making jerky out there with 4 dehydrators and the furnace going rather high for days in January/February cold will make the gas and electric meter spin, haha! But it was tasty and fun Quote Link to comment Share on other sites More sharing options...
Cheetah Posted March 30, 2015 Author Share Posted March 30, 2015 Thanks for the tips everyone! Quote Link to comment Share on other sites More sharing options...
11-87 Posted March 31, 2015 Share Posted March 31, 2015 Use a high performance batt. Don't be stupid and try and stuff 6" in an 2x4 wall. Compaction will reduce the insulation values of the product Quote Link to comment Share on other sites More sharing options...
crothmeier Posted April 3, 2015 Share Posted April 3, 2015 ^^ What he said. Jamming a thicker batt in the cavity will give you less r-value. You can get an R-13 batt for a reasonable price. Heat rises. Go heavier on the attic and leave the walls at 2x4. Quote Link to comment Share on other sites More sharing options...
BoxMN Posted April 6, 2015 Share Posted April 6, 2015 FWIW the R15 that i used was made for 2x4 walls. Menards doesn't have it stock but HD did. I did not stuff it, nor was it much more $$. Can also find it for 2' widths. Quote Link to comment Share on other sites More sharing options...
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