The sweating is "condensation" the cold slab reacting with the high humidity of the rainy day. This is just like the sides of a glass of iced tea.
you can either remove the humidity....hard with a screened space. Or warm the slab / insulate it which is also hard.
Being a screened porch this structure should be somewhat water resistant by its design...so having a wet floor should not be much of an issue. Is there a reason you want this place to be 100% dry?
yes because I want to make a nice seating area with it and when it is wet it is slippery...is there anything I can put on the cement to stop the sweat? like a sealer or something? I wanted to put tile down on it
Thank you for the suggestions but this doesn't answer my question because it does not tell me if there is a solution.
I believe the issue is the natural temperature differential plus humidity, no matter what is on the floor.
My stained garage floor occasionally does the same.
Heard of Astroturf?
only that part does it the laundry room is an extension of the same floor but only half of the laundry room sweats..this floor was and addition..I think they did not put visquine. but the point is is there any thing I can use to stop it..like a sealer? that is what I want to know...I know the cause...always did.
tried astroturf that is what was on it when I bought the house and it smelled mildew so removed it
Carol, sorry I can't be of much help, that's a tough one on me.
It may have to do with the visquine, I don't know.
The problem is a combo of the air working with the cool slab...in order for this to not occur one of those variables will need to be removed. The humid air could be removed by sealing in the room with glass or solid walls. The slab could be made warmer via a electric radiant heating element set under tile. The fact the the slab is not insulated below would have this "heating" be less than ideal in terms of efficiency.
If you want a lower cost alternative to the slippery. A textured paint 'anti-skid" finish can be applied. The concrete will still cause some condensation to form but at least the "traction"will still be there.
A built up "insulated floor" is another option, but this would require some engineering to keep horizontal rain from compromising the new surface.
A wooden "deck" could be installed over the concrete on thin PT sleepers. This would have the condensation still form on the concrete but the wooden surface above would still be dry and usable. The decking would be "weather proof". This decking could be real wood or one of the many synthetics.
I recently added a screened in patio and it sweats most of the time. Is this normaI? I do live
in the Houston area where humidity is always high. What can I do to prevent this sweating?