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 07-15-2008, 19:26 Post: 155318
bemike61



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 humidity in garage

i have a concrete block building with concrete floor and metal roof , wood trusses. i had foam insulation sprayed on the inside of metal roof to help lower heat.

now i have a problem with humidity, the building is not vented. before i start to install vents, i want some ideas from others on what works or does not.

right now what was stored in there had mold on it and things were starting to rust from the moisture.

this was a new building, is it just part of everything curing and the moisture problem gone.

i was hoping that maybe i could figure out some type of climate control so i could put a car or truck in there without it rusting away.

thanks






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 07-15-2008, 20:31 Post: 155319
kwschumm



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 humidity in garage

We have that problem in our garage. It won't go away on it's own. It's probably wetter here in Oregon than Kentucky but temperature changes in humid climates always brings condensation. I'd advise installing a power vent fan with a humidistat.






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 07-16-2008, 00:43 Post: 155324
bvance

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 humidity in garage

I have a daylight basement shop below a guest house and the only way I have found to control humidity is with a dehumidifier. I also live in very wet country so it is a must.

The dehumidifier I bought has a pump that pumps the water into my sink drain so I never have to empty the resevoir.

I get about 1 gallon per day and the shop stays at about 50% humidity even at that. Before I put one in you would not know I have high humidity as it is not evident any where, but for the hyrgometer. It's a bit expensive because it costs about $30.00 per month to operate.

Brian






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 07-16-2008, 01:16 Post: 155326
hardwood

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 humidity in garage

If your building isn't too big a window air conditioner might solve your problem and give you some hot weather relief to boot. Usually a good used one can be found on a garage sale for about nothing, they seem to never wear out. Frank.






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 07-16-2008, 08:10 Post: 155332
kthompson



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 humidity in garage

To get good moisture removal with air conditioning be sure you don't get one so over size it does not run long. Long run times removes the moisture, not just dropping the temp in the room.

A good moisture barrier under a concrete floor is now required by code here. My mother in laws carport floor will look like it rain on it due to not having a barrier. You may find a good sealer on the walls and floor would help. Ask a local paint store where the pros shop. kt






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 07-16-2008, 09:56 Post: 155336
Murf

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 humidity in garage

The first thing is to understand the problem.

Your concrete floor is well connected to the cold earth, meaning that, especially overnight, your slab floor gets quite cool.

Then because of it's mass, and the facts that it's both in the shade (inside the insulated building) and still connected to the cool earth, it warms up MUCH slower than the surrounding air. The result is no different than putting a cold bottle from the fridge on the table. Just watch the droplets of moisture form.

Now, the simplest solution is to have something even colder, or at least more able to deal with the moisture.

If you are handy, all you would need to do is make up a simple dehumidifier. This need be nothing more than a shallow well supplying water to an old car radiator in a plywood box and push the air through it with an old furnace blower.

I basically air condition my shop at home this way. I can lower the temperature by 10 - 15 and the humidity by probably 30% just by running it during warm weather.

You could also just put in a few ceiling fans and a commercial dehumidifier.

Either way, the trick is not to vent the building, this will just bring in more humidity from outside, but rather lower the relative humidity inside the sealed up building.

Best of luck.






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 07-16-2008, 11:33 Post: 155339
AnnBrush



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 humidity in garage

Is your problem high humidity or condensation? Also effective is to remove water sources or water traps from the outside of the building. Make sure the surrounding area is not overgrown with weeds and shade bush etc. Clear the adjacent 5 feet of space around the outside walls and replace grass with gravel or stone. If water backs up onto the building install a tile and drain it away. Don't stack material like wood or junk up against the exterior walls of this installation. If possible remove trees providing permanent shade. You will be amazed at how much these contribute to your problem.






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 07-16-2008, 11:52 Post: 155342
kthompson



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 humidity in garage

Murf, I think I have the concept, but where does the water go after running throught radiator? Is it pumped back into the ground? Is this not basically a geothermo (now if FAT FINGERS spelled that correctly it was an accident EW) set up? Pictures?

On a different note thought of you and such yesterday Murf. Was cutting along a ditch and thought of my first question at TP and your reply. Bout the same as this. May be now a few years later ready to tackle it due to needs growing and a piece of equipment I had on loan returned. A side mounted cutter. kt






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 07-16-2008, 12:01 Post: 155343
earthwrks

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 humidity in garage

I'm not convinced it's necessarily the floor that is the biggest culprit; the nite/day temperature fluxuations can't be that great to induce a great amount of condensation leading to humidity.

What I have seen, especially in commercial buildings made of block walls is the walls are the biggest offender for two reasons: they are exposed to the sun and ambient heat acting like radiators and condensors. Also, if the building was not built right--like if the block is not far enough up off the foundation, moisture will wick its way up the block from inside---or like I have seen in self-storage buildings-- the roof and gutter systen was dumping water or wind-driven rain into the block which eventually acts like a vertical reservoir slowly seeping moisture into the building. Evidence of this is effloresence(sp) (whitish, powdery salts) in the mortar or crumbling mortar.
I'd suggest furring out the block walls and insulating them. And you'll need to put some sort of luan or drywall up too. A vapor barrier is also necessary, but talk to builders who speacialize in this aspect because there have been lawsuits here in Michigan resulting from bad national building codes requiring vapor barrier which caused rot between the walls. I forget which is the right way to place it so check into it.






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 07-16-2008, 12:25 Post: 155345
kwschumm



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 humidity in garage

This winter I'm planning an experiment in our garage. We have a spare ERV unit that might make a good garage ventilator while keeping the garage temperature relatively warm. Our garage is not insulated and we always have condensation on the windows during winter, but the garage is attached to the house and is warmer than outside (nothing ever freezes in the garage).






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Discussion Boards > Active Subjects > Messages as Posted > Other Home Building Forum

Thread 155318 Filter by Poster:
AnnBrush 1 | bemike61 1 | bvance 1 | earthwrks 1 | hardwood 1 | kthompson 2 | kwschumm 2 | Murf 2 |




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