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Dinosaurus

08:58AM | 11/29/05
Member Since: 06/16/05
140 lifetime posts
Bvlawn
I have a cement patio outside my home. It has been covered by indoor outdoor carpet. I was told that the reason the previous owner had the patio recovered twice was because of mildew. Where does this mildew come from and wouldnt it be best to not be covered if there is a mildew problem.

I am wondering what is under that cement slab, besides dirt. Any suggestions.

kirk28

05:54PM | 12/08/05
Member Since: 12/07/05
6 lifetime posts
I suggest pulling the carpet off and do some extensive cleaning. Use concrete cleaner and a pressure washer. If the patio looks good after it's clean, then apply a couple coats of solvent base acrylic sealer. This keeps the mold away. If it still looks bad when clean, then consider colored sealers, concrete stains, or even an overlay.

Kirk Muhlhauser

http://www.all-things-concrete.com

Dinosaurus

06:06AM | 12/09/05
Member Since: 06/16/05
140 lifetime posts
Thanks for the reply. I purchased the house last May because after the older woman passed away. I found out ironically from the person who designed her curtains that they also laid down the indoor outdoor carpet on the patio. I was told they replaced the carpet twice in about 2 years. The concrete is cracked in some places and he said he patched them up. But this past summer when I sat out there I could tell that there was mold under that carpet. Do you think I will have to replace the whole patio?

kirk28

10:59AM | 12/09/05
Member Since: 12/07/05
6 lifetime posts
There's really no way to tell if it needs replaced until you see it. Deciding whether to replace it will probably just be a matter of opinion. You can tell with the carpet on if there's any settlement or vertical displacement that would require replacing it. As far as cracks go, it's not necessary to replace concrete because it cracks. All concrete cracks but they more unsightly when they occur outside of control joints (those grooves used to control cracks). So whether to replace it depends on if it's worth spending the money to not have to look at those cracks. Just to give you an idea, expect to pay $5-$7 per sq ft to replace regular concrete.

Kirk Muhlhauser

http://www.all-things-concrete.com

Dinosaurus

08:26AM | 12/14/05
Member Since: 06/16/05
140 lifetime posts
My main concern about the concrete is this: The previous owner of the home had replaced the indoor outdoor carpet on the concrete patio (I am told) because of mold issues. When I walk on the concrete at one end I can tell that there is a condition there. I bought the home last may. When sitting out there I could tell that there was mold somewhere because I am allergic to it. I guess my main concern is the mold. I could deal with it however it looks as long as there is not a moisture mold problem. Could there be mold under the concrete? Not just under the indoor outdoor carpet? Thanks ago so much. I learn so much at this site.

kirk28

03:42PM | 12/14/05
Member Since: 12/07/05
6 lifetime posts
I've never dealt with the issue of mold being underneath concrete. It usually happens on the surface when there's alot of trees and vegetation around or grass clippings that get left for a long time. I suppose it's possible but not likely. I've broken out many old patios and never come across a noticeable mold problem. But I would say even if there is mold underneath the concrete, taking off the carpet is the best thing to do because you will have more mold with the carpet than without. Mold grows in warm/moist places, so when it rains and the carpet stays wet for long period and warms up from the sun, it makes prime conditions for growth. Take off the carpet so the patio can dry quickly. This can only help the problem. The previous homeowner may have been feeding you BS and put carpet over it because the concrete's in bad shape.

Enhance and maintain your concrete!

http://www.all-things-concrete.com

Dinosaurus

05:38PM | 12/14/05
Member Since: 06/16/05
140 lifetime posts
Actually this was a one ower home. THe lady was 84 when she passed. I found out by accident that she replaced the carpet outside. They left the curtains in the home and I found out they were custom made so I went to the shop to talk to the lady about the curtains and what all she did in the home.That is when she told me that they replaced the carpet outside two times since 2003. She said there was mold. Now is there a certain way the concrete has to be laid. I am just wondering something. Could there be anything to do with an old septic sytem under that concrete? Did they do that back then. THe home was built in 1960. Very nice house but it does hold moisture. I have to solve that too. I was thinking maybe the rain spout because it tends to fall down.

kirk28

03:44PM | 12/18/05
Member Since: 12/07/05
6 lifetime posts
I suppose it's possible that the mold could be coming from underneath. It's a problem that I've never heard of. I can say for sure though that removing the carpet can only help the problem. Any thing that holds moisture attracts mold. I have seen old patios with septic lines underneath but not with excessive mold problems. The only suggestion I can make is take off the carpet, detour any water that may flow underneath, and see what happens. If the problem persists then all you can do is tear out the patio, fix the subgrade, and replace it. Sorry I don't have a better answer for this. You might try posting this question in another forum. http://www.doityourself.com has an excellent forum with many knowledgeable people

Enhance and maintain your concrete!

http://www.all-things-concrete.com
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