condensation in garage-how to stop??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**JQ-72** · 02-28-2009, 07:23 PM

Well, I restored the frame of my 72 Cheyenne Super last fall and it's been sitting in the garage all winter. I pulled it out today when I was Spring cleaning my garage and noticed surface rust on new bolts and on a few spots where the paint was thin. I've noticed when its cold and rainy that some metal objects in my garage get moisture on them. It's a basic A-frame 30X30 with loft on a concrete slab. There was no plastic put under the concrete - just poured on gravel. How can I stop the moisture - mainly on the truck? Would a large rubber mat under the truck help? Thanks for any help.
Joshua

teeitup · 02-28-2009, 07:29 PM

I just had to put vents in my roof, soffets and gable ends and also been running a dehumidifier to get condensation out of my garage, its 27x24 with an insulated ceiling and walls. I'm running natural gas heat in it and man it was getting wet everywhere, after I put the vents in I've had no problems

*Shane* · 02-28-2009, 11:21 PM

Off Topic: Hey Joshua ... found a pair of backing plates today at Pitt's.

**special-K** · 03-01-2009, 06:38 AM

How`s the grade around the building?If water can get under the slab it will want to come up through.That`s the main source.The other is condensation from difference in temp in & out.Dehumidifiers help,but need draining.Air flow helps alot.I blow a small fan on my Harley just to keep moisture from settling on it.Heat takes it away,too.But,just a cieling fan helps.

72freak · 03-01-2009, 08:06 AM

Make sure the water is running away from the structure, keep the air moving inside and you will probably need to get a dehumidifier. and keep itt running

grinch4om · 03-01-2009, 08:56 AM

if it isn't heated and stays cold , it will sweat when warm temps hit cold objects

68gmsee · 03-01-2009, 10:53 AM

Mine is real bad about it. A lot of garage moisture problems are caused by water seeping up through the concrete and, of course, condensaton.

Also, most of them don't have a vapor barrier under the foundation like home slabs do -especially if they're detached. I saw a show on t.v. where they went in and sealed the concrete with a kit. If I was planning on staying in my house longer I would probably seal mine.

fastwillie 696969 · 03-01-2009, 10:52 PM

Quote:

Originally Posted by grinch4om

if it isn't heated and stays cold , it will sweat when warm temps hit cold objects

brillant good knowledge

**JQ-72** · 03-02-2009, 12:04 AM

Thanks for the help so far. I left out some some info - it's detached and not insulated with a ridge vent on the roof. Nothing in my attic gets wet - just the stuff downstairs.

JQ

**special-K** · 03-03-2009, 12:22 PM

Do you have electric?You need circulation.If you can ad ventiation in the walls below the attic,that would be good.

bpmcgee · 03-03-2009, 12:34 PM

Joshua,

Anything which you put on the truck which isn't painted will rust eventually

I usually clean up the bare metal and wipe it with a bit of phosphoric acid -- it creates a grey surface coat which won't prevent painting later, but will deter rust for a very long time.

B

cdowns · 03-03-2009, 12:42 PM

if you use good stainless bolts they dont rust

bpmcgee · 03-03-2009, 02:38 PM

CDowns,

You're right, but for important bolts, I'm worried about the difference in shear properties between schedule 8 and stainless.

02-28-2009, 07:23 PM	#1
JQ-72 Senior Member Join Date: Feb 2001 Location: Killen, Alabama USA Posts: 3,632	condensation in garage-how to stop??? Well, I restored the frame of my 72 Cheyenne Super last fall and it's been sitting in the garage all winter. I pulled it out today when I was Spring cleaning my garage and noticed surface rust on new bolts and on a few spots where the paint was thin. I've noticed when its cold and rainy that some metal objects in my garage get moisture on them. It's a basic A-frame 30X30 with loft on a concrete slab. There was no plastic put under the concrete - just poured on gravel. How can I stop the moisture - mainly on the truck? Would a large rubber mat under the truck help? Thanks for any help. Joshua __________________ 72 Cheyenne Super swb. Factory 402/400,tach,posi,AM/FM, A/C. Adding cruise, 8-track 72 Cheyenne Super swb. 350/350 A/C, bucket seats 72 Cheyenne swb. Factory 402/400, tilt, posi, A/C 72 Cheyenne Super K-10. 350/4 spd., posi. 72 Suburban 350/350 tilt, tach, AM/FM, A/C, luggage rack 72 GMC Sierra lwb. 350/350, A/C. medium green/olive interior

02-28-2009, 07:29 PM	#2
teeitup Just like to part out trucks!! Join Date: Nov 2001 Location: Meriden, Ks-North of Topeka 10 miles Posts: 27,395	Re: condensation in garage-how to stop??? I just had to put vents in my roof, soffets and gable ends and also been running a dehumidifier to get condensation out of my garage, its 27x24 with an insulated ceiling and walls. I'm running natural gas heat in it and man it was getting wet everywhere, after I put the vents in I've had no problems __________________ 67 Chev swb stepside 4x4 283 4 speed SOLD 72 blazer 4x4 4 speed Cheyenne 72 GMC swb 4x4 fleet 4 speed, original paint 1958 Cameo (one of 1405 built, it was my dads) 2020 chevy Apex 4x4 crew cab 1969 Z28 with the 302 1980 chevy swb 4x4 1964 chevell Malibu SS 1976 K20, sold new originally out of my dads chevy dealership Members that I've met, over 200 probably closer to 300 in the 12 years I've been on this site, everyone I met "It was a pleasure"

02-28-2009, 11:21 PM	#3
Shane Account Suspended Join Date: Jun 2000 Location: over yonder Posts: 14,270	Re: condensation in garage-how to stop??? Off Topic: Hey Joshua ... found a pair of backing plates today at Pitt's.

03-01-2009, 06:38 AM	#4
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: condensation in garage-how to stop??? How`s the grade around the building?If water can get under the slab it will want to come up through.That`s the main source.The other is condensation from difference in temp in & out.Dehumidifiers help,but need draining.Air flow helps alot.I blow a small fan on my Harley just to keep moisture from settling on it.Heat takes it away,too.But,just a cieling fan helps. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

03-01-2009, 08:06 AM	#5
72freak Rottenwood Garage Member Join Date: May 2005 Location: Marietta, Georgia Posts: 4,321	Re: condensation in garage-how to stop??? Make sure the water is running away from the structure, keep the air moving inside and you will probably need to get a dehumidifier. and keep itt running __________________ 2004 Chevrolet Suburban C1500 2001 Chevrolet 2500HD Crew 6.0 1999 Harley Davidson Electra Glide 1972 Chevrolet C-20 Custom Camper "Dump Truck" 1972 Chevrolet C-20 Suburban "Big Green" 1969 Chevrolet C-50 Wedge Hauler "Leonidis" 1966 C-10 2x4 short fleet 327 4 speed "Race Truck" 1952 Plymouth Cranbrook "Rican" (my grandfathers) 1931 Ford Model A Coupe "Black Beauty" 1930 Ford Model A truck "Club Cab" 4x4 Rottenwood Garage and Speed Shop.....where everything must be racy! *It's not just a hobby..It's a LIFESTYLE!!!* Thanks for nothing Barrett-Jackson You cant fix stupid or teach accountability! Time wasters, looky Lous and tire kickers are everywhere!

03-01-2009, 08:56 AM	#6
grinch4om dang its hot Join Date: Nov 2006 Location: frankfort kentucky Posts: 1,349	Re: condensation in garage-how to stop??? if it isn't heated and stays cold , it will sweat when warm temps hit cold objects

03-01-2009, 10:53 AM	#7
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: condensation in garage-how to stop??? Mine is real bad about it. A lot of garage moisture problems are caused by water seeping up through the concrete and, of course, condensaton. Also, most of them don't have a vapor barrier under the foundation like home slabs do -especially if they're detached. I saw a show on t.v. where they went in and sealed the concrete with a kit. If I was planning on staying in my house longer I would probably seal mine.

03-02-2009, 12:04 AM	#9
JQ-72 Senior Member Join Date: Feb 2001 Location: Killen, Alabama USA Posts: 3,632	Re: condensation in garage-how to stop??? Thanks for the help so far. I left out some some info - it's detached and not insulated with a ridge vent on the roof. Nothing in my attic gets wet - just the stuff downstairs. JQ __________________ 72 Cheyenne Super swb. Factory 402/400,tach,posi,AM/FM, A/C. Adding cruise, 8-track 72 Cheyenne Super swb. 350/350 A/C, bucket seats 72 Cheyenne swb. Factory 402/400, tilt, posi, A/C 72 Cheyenne Super K-10. 350/4 spd., posi. 72 Suburban 350/350 tilt, tach, AM/FM, A/C, luggage rack 72 GMC Sierra lwb. 350/350, A/C. medium green/olive interior

03-03-2009, 12:22 PM	#10
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: condensation in garage-how to stop??? Do you have electric?You need circulation.If you can ad ventiation in the walls below the attic,that would be good. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

03-03-2009, 12:34 PM	#11
bpmcgee Registered User Join Date: Mar 2003 Location: Northern Illinois Posts: 2,181	Re: condensation in garage-how to stop??? Joshua, Anything which you put on the truck which isn't painted will rust eventually I usually clean up the bare metal and wipe it with a bit of phosphoric acid -- it creates a grey surface coat which won't prevent painting later, but will deter rust for a very long time. B

03-03-2009, 12:42 PM	#12
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: condensation in garage-how to stop??? if you use good stainless bolts they dont rust __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

03-03-2009, 02:38 PM	#13
bpmcgee Registered User Join Date: Mar 2003 Location: Northern Illinois Posts: 2,181	Re: condensation in garage-how to stop??? CDowns, You're right, but for important bolts, I'm worried about the difference in shear properties between schedule 8 and stainless.

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