[gorillarick]

Originally Posted by It's Hot There

Before and after results are pretty much impossible because duplicating conditions is impossible. Duplicating inside/outside temp, rising temp rate, clouds, etc.

Yeah, you'd have to study it for a year or two; before and after.

No one mentioned putting a ceiling fan (maybe solar) thru the ceiling of the garage and roof to suck warmer air outa the garage.

[retiredguy123]

Originally Posted by gorillarick

Yeah, you'd have to study it for a year or two; before and after.

No one mentioned putting a ceiling fan (maybe solar) thru the ceiling of the garage and roof to suck warmer air outa the garage.

That would work only if the temperature in the garage is higher than the outside air temperature. But, the temperature in my garage is usually about the same as the outside air temperature, so a fan wouldn't do anything. Currently, the outside air temperature is 82 degrees, and the temperature in my garage is 82 degrees. I would suggest that you place a thermometer in your garage and monitor the garage and the outside temperatures. Also, if you do install a fan in the ceiling, it will need to have a fire damper to maintain a fire and smoke separation between the garage and the attic to comply with the building code and prevent a fire from spreading.

[asianthree]

Originally Posted by gorillarick

Yeah, you'd have to study it for a year or two; before and after.

No one mentioned putting a ceiling fan (maybe solar) thru the ceiling of the garage and roof to suck warmer air outa the garage.

We actually keep temp monitoring in this garage , have kept since 2/2022. It’s an older graft system mainly used in medical facilities, for temp monitoring. A equipment perk when systems get replaced.
Certain items are removed from the garage once it hit a certain temp. This is the first south facing garage, out of all of our TV homes.

[Boffin]

Originally Posted by roadrnnr

just wondering if this is done in here to reduce heat in the garage?

I have a small courtyard villa

My complete list:
Radiant barrier on garage doors
Two vents (one high one low) on garage doors
Radiant barrier on rafters
Ceiling fan in garage

Garage temperature is within 5 degrees of exterior ambient air temperature.

[jrref]

The other thing everyone is missing is when the attic in the garage and for that matter the attic over the Lanai, both areas not insulated when the home is built, superheats, the sheetrock in the ceiling expands excessively. This extreeme expansion and contraction causes the sheetrock to crack. Only insulating these areas will minimize or prevent this from happening.

[daniel200]

Originally Posted by dewilson58

Have wireless temperature sensors in attic, in garage.

Don't need "before & after insulation results"..............I have realtime facts.

I do not have insulation over the garage. And my garage is always 10 to 15° cooler than the attic in the summer.


Right now my garage is 87 and my attic is 98°. I do have very good insulation over the rest of the house and my garage is on the south side.

To really know if your insulation was effective you need data without the insulation in place. My data indicates you did not gain anything

[dewilson58]

Originally Posted by daniel200

I do not have insulation over the garage. And my garage is always 10 to 15° cooler than the attic in the summer.


Right now my garage is 87 and my attic is 98°. I do have very good insulation over the rest of the house and my garage is on the south side.

To really know if your insulation was effective you need data without the insulation in place. My data indicates you did not gain anything

You're funny.

Based on your numbers, you wasted money by insulating your house if insulation does not "gain anything" as you state.

I have plenty of neighbors who did not insulate the garage......their garages are a lot warmer than mine.

Thanks for the laugh.

[crash]

Originally Posted by retiredguy123

That would work only if the temperature in the garage is higher than the outside air temperature. But, the temperature in my garage is usually about the same as the outside air temperature, so a fan wouldn't do anything. Currently, the outside air temperature is 82 degrees, and the temperature in my garage is 82 degrees. I would suggest that you place a thermometer in your garage and monitor the garage and the outside temperatures. Also, if you do install a fan in the ceiling, it will need to have a fire damper to maintain a fire and smoke separation between the garage and the attic to comply with the building code and prevent a fire from spreading.

The temperature in the attic can reach 140F doubt your garage ever gets that hot.

[sdeikenberry]

Originally Posted by roadrnnr

just wondering if this is done in here to reduce heat in the garage?

I have a small courtyard villa

We own a courtyard villa. First thing I did after moving in was increase my attic insulation and put it over garage also. Makes a big difference in heat gain.

[SaucyJim]

I spared myself the stress of all this by having a full-body suit made of insulation. Garage attic. Garage itself. Lanai. Bedroom. They all feel the same temperature to me now.

[MandoMan]

Originally Posted by roadrnnr

just wondering if this is done in here to reduce heat in the garage?

I have a small courtyard villa

I live in a courtyard villa. If your garage door is hit by sunlight, insulating the garage door helps a lot. (I have two layers on mine—styrofoam panels and reflective foam and bubbles. I did it myself last winter. It was a lot of work, as the hurricane bracing has to be removed to install the insulation.

Yes, insulating your attic over the garage will help a lot, too. I had SolarGuys install an attic fan. They did a great job, but it didn’t help much, it uses a lot of electricity, and it’s pretty expensive. The problem is that if it’s 90° in the shade and humid, that fan is pulling 90° humid air into your garage, and it won’t feel cool, even if it is getting rid of air that is even hotter than that.

Once you’ve insulated your attic and garage door, what is next. Well, if you take your car out somewhere in the daytime, when you drive it back into your garage, it is going to radiate heat like a hot iron or a wood stove. So, instead of parking in the garage, park it in the driveway, then pull it into your garage an hour after sunset. That will help a lot.

The temp here at night at this time of year drops down to the mid to low 70s. If your garage door is open all night, your hot concrete slab in the garage and the car and Sheetrock and everything will cool down. Then close the door at dawn, and it will be a lot cooler all day than it would have been otherwise. But I definitely do not recommend that. For a year I used a sliding screen on my garage door and left the main door open. That kept things cooler at all times. Then an expensive bicycle was stolen in the night. No more screen door.

Essentially, having a cooler garage is like having a cooler house if you don’t have air conditioning. In much of the country, people open their windows at night and use a whole house fan in the attic to expel the warm air and suck in the cooler air. Then at dawn they close all the windows and curtains and blinds to keep things cooler. That works, to some extent, but around here, that air that gets sucked in is very humid, and again, I really don’t recommend leaving your garage door open at night.

[dewilson58]

Originally Posted by MandoMan

Once you’ve insulated your attic and garage door, what is next. Well, if you take your car out somewhere in the daytime, when you drive it back into your garage, it is going to radiate heat like a hot iron or a wood stove. So, instead of parking in the garage, park it in the driveway, then pull it into your garage an hour after sunset. That will help a lot.

[Captainpd]

Originally Posted by dewilson58

We did our garages during construction.

Depending on the day..................10 to 20 degrees cooler.

Very cheap investment.

Absolutely noway your garage is 20° cooler

[HJBeck]

Same here, they did a real good job. They also blew in insulation above my enclosed lanai.

[TomSpasm]

At a previous house in Sarasota, my wife complained that the garage was too hot and insisted we insulate it. I thought it was a complete waste of money, but compromised and insulated it. I was surprised at how much difference it made. When we bought a courtyard villa here in 2012, one of our first projects was to insulate the garage and the lanai, and we believe both are more comfortable areas as a result. Highly recommend doing both, in spite of not having any hard data to present.