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Old 08-08-2012, 10:52 AM   #16
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Ceiling insulation for cooling


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Originally Posted by puttster View Post
Steel double garage door is my next target. I was going to try an Insulfoam garage door kit but when I went to Lowes I saw some 1/2" foam board with an aluminum-looking material (radiant barrier?) on one side. Would this be a good plan for the door: glue some 1/2" strips to each panel, then cut and fit the foam board in place so the reflector is 1/2" off the door?

Or just go with Insulfoam, it has good reviews.

putts
Any thoughts on the foam board plan?

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Old 08-08-2012, 08:43 PM   #17
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Ceiling insulation for cooling


Won't hurt, can't say how much it will help.
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Old 08-09-2012, 12:34 PM   #18
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Ceiling insulation for cooling


Before insulating, seal up all electrical and plumbing penetrations into the attic. Otherwise, air will just leak through your insulation.

When you insulate, you may as well overinsulate. The material is cheap, your labor is valuable. Do the job once and it works forever.
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Old 08-22-2012, 12:15 AM   #19
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Ceiling insulation for cooling


I went with the Insulfoam. You get it dropped-shipped from Lowes and after paying they tell you it will arrive in two weeks! I complained and it showed up in six days. Insulfoam is just styrofoam with grooves on the door side, so it can bend, and a tough backing on the garage side. You get eight sheets 21" x 54" for $55 per package. I used a ~10" bread knife (large serrations) to cut it and that went quite well.

The pros are: 1.) the boards are 1 1/4" thick, which is a great, maybe perfect, thickness for a metal garage door. No adhesive is necessary to hold the panels in place. 2.) the backing on the exposed side is good and tough, and when installed looks really quite professional.

The cons are: 1.) You have to do a lot of cutting, usually three main cuts per board. Then you have to trim the trim boards to allow for the screws protruding through the vertical supports. A 20 panel garage door is a full day's work. Overall, probably more cutting than if you just went with 4x8 sheets of foam board. 2.) The grooves were not effective in getting the boards to bend into place on the panels that had horizontal support beams in front them.

As for effectiveness... at 4 pm when the outside temp is 95, my garage is 85 using a puny portable AC unit. I give 2-3 degrees benefit to the uninsulated garage, 5 deg to the R-13 in the attic and 2-3 deg to the West-facing Insulfoam door. I'll be installing a through-the-wall A/C and expect another 10 degrees benefit, hopefully, more.




Overall I am glad I went this way. The extra cost and work will fade from memory. The tough and classy door will be with me and everyone else who comes into the garage for many years.

.puttster

Last edited by puttster; 08-24-2012 at 12:01 PM.
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Old 08-22-2012, 11:52 AM   #20
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Ceiling insulation for cooling


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When you insulate, you may as well overinsulate. The material is cheap, your labor is valuable. Do the job once and it works forever.
I went with R-13 in the garage attic, which will prevent 92% (12/13ths) of the heat loss through there. R-30 would have cost twice as much and taken me twice as long and only gained me another 5%, so in this case overinsulating was not as economical. I still might put in some radiant barrier though, we will see.

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