DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Bricks, Masonry and Concrete > Painting a Concete Garage Floor




Reply
 
Thread Tools Search this Thread Display Modes
Old 05-29-2009, 07:38 AM  
jf07120
Junior Member
 
Join Date: May 2009
Posts: 1
Default Painting a Concete Garage Floor

I have a garage flor that has been painted with a poor paint or the individual did not seal it because it's peeling off. There is also some cracking and pits in some places.

what steps do I need to take to fix this and ultimately paint it again?



__________________
jf07120 is offline  
 
Reply With Quote Quick reply to this message
Old 05-30-2009, 03:14 AM  
Nestor_Kelebay
Emperor Penguin
 
Nestor_Kelebay's Avatar
 
Join Date: Mar 2009
Location: Winnipeg, Manitoba
Posts: 1,844
Liked 2 Times on 2 Posts

Default

The peeling MIGHT be because a poor paint was used. But, it's also very possible that the reason why the paint is peeling off is because moisture is evaporating from that concrete garage floor.

Water underneath the concrete garage slab can wick up and migrate upward through that concrete. When it reaches the top surface of the concrete, it wants to evaporate, but any paint on the surface of the concrete may prevent that from happening. Water is stubborn. It will both expand when it freezes or expand when it evaporates with tremendous force, and that force will push any impermeable paint off any substrate, including epoxy paint off of a concrete garage floor.

If it wuz me, what I'd do is get a piece of clear plastic sheeting (like vapour barrier) and tape that clear plastic down (around it's perimeter) on the worst area for peeling on your entire garage floor. Do that first thing in the spring when the snow starts to melt, and put a "hygrometer" under the plastic before fully taping down it's perimeter. A hygrometer measures relative humidity, and any increase in humidity under the plastic means that moisture is evaporating out of the concrete slab at that location. And, that means that ANY impermeable coating (like epoxy paint) that you put over the concrete at that locations will peel off. There's no if's, and's or but's about it, if you put an impermeable coating over any place on that slab that moisture evaporates from, then that coating isn't gonna last. It'll crack and peel at those spots.

You can buy relatively cheap hygrometers at Lee Valley or any place that sells hobbyists supplies.

You should be able to do the same thing after a heavy rain. What's needed is for the ground water level to be so high as to get the bottom of the concrete slab wet. When that happens, the concrete will absorb moisture, and some of it will migrate to the top of the slab where it will register as an increasing relative humidity under your plastic.

__________________
Nestor_Kelebay is offline  
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
need tips on painting a metal garage door vabeachtime General Home Improvement Discussion 17 01-13-2012 09:17 AM
Epoxy paint for garage floor MoJoe Flooring 6 06-23-2011 07:10 PM
Concete slab with hot water heating below- Moving walls skizsam General Home Improvement Discussion 0 02-16-2009 02:30 PM
Leveling Garage Floor YADAX3 General Home Improvement Discussion 2 04-14-2007 09:07 AM
Raised floor between house and garage. hagnik Framing and Foundation 1 03-05-2007 01:50 PM

Newest Threads

LATEST SPONSOR DEALS