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DUDE! 07-07-2008 11:42 AM

Help with concrete
Hello All, in the midst of working on the living room, after pounding out the old fireplace hearth, I'm going to put down a new one. The opening is 63" by 18" by 1 1/2". Planning on using concrete. It'll be about a week before I get to this but wanted help on choosing the mix. I'd like to use pre-mix and will probably end up at lowes or home depot. I'm looking for what type I'd need, don't want any stone in it, just to end up with a smooth finish. Any help would be greatly appreciated,, thanks,, sorry, also, the base is concrete, I'll be using a bonding agent before adding the next layer.

Ron6519 07-08-2008 06:31 PM

You don 't mention how thick or high the walls will be. But unless this is a doll house, you'll need a concrete mix.

DUDE! 07-08-2008 06:52 PM

my mistake, wrong terminology, I'm redoing the floor just in front of the fireplace, sorry for mis info,,,,,, the floor opening is 62 by 18 and 1 1/2" deep. There is a concrete base in place. I'm leaning toward using Quikrete sand/topping mix. It says can be used for under 2" applications. I've been trying to read up on what type mix I should use.

buletbob 07-08-2008 10:04 PM

Yes the bonding agent should be used. And for the sand/topping it is also a good choice. its already pre mixed. and quickcrete is pretty rich anyway.
I have used that product for some small shower pans.

DUDE! 07-09-2008 07:33 AM

Bob, I have a question about the bonding agent, I was able to pull out the old slab by lifting it out, in pieces, not sure if I would of been able to do that if originally they had used a bonding agent. Do you think there was a reason they decided not to use an agent? I'm assuming if they had I wouldn't of been able to take out the section I did as easily. thanks

yesitsconcrete 07-09-2008 07:48 AM

i'm not positive but might they have thought gravity'd keep it in place ??? or is it possible modern latex bonding agents weren't avail & they used time-honored dampening instead ?

buletbob 07-09-2008 07:24 PM

Is This is a fire place hearth your talking about? If so did they pour the concrete from the sub floor down on an angle resting on the foundation wall? aproxamitly 18" away from the fireplace? was there tile on the old hearth or was there brick.? What are your plans for the finish product? Tile, Granite, Marble,?

DUDE! 07-09-2008 08:56 PM

the fireplace chimney is located in the center of the house. There is a floor cutout in front of the fireplace opening, its a concrete base. Looking at it from the basement, there is a boxed out section, made of wood, that is lower then the rest of the surrounding floor, you can't see the concrete from the basement. We want to just fill in the opening with concrete, we removed the unwanted tile that was originally there. Want a smooth finish, that is why I thought the mix I stated above would work, as for not wanting to use a bonding agent, just in case plans change in the future. Also, although the original height was a tile thickness higher , I plan only to go level with the floor. I tried just taking out the old tile but found it easier to just pull up the tile and concrete pad it was attached too. thanks for any input.

buletbob 07-10-2008 04:33 PM

The sand mix will work fine ! I would still use the bonding agent, its not that expansive. You can always thin set tile over this base at a later time with out removing what you just installed.

DUDE! 07-10-2008 04:47 PM

Bob, I picked up the sand/topping mix today, want to get some painting done in that area first. As for the bonding agent, I'm taking your advise and picking some up to use. I wasn't sure if I was making it hard for next owner to change but like you said, tile could be added in the future. I thank you for your input, I appreciate you taking the time.

buletbob 07-10-2008 04:53 PM

Your welcome Glad I could be of any help! GOOD LUCK

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