Concrete over old basement walls?


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Old 04-02-08, 12:30 PM
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Concrete over old basement walls?

My parents want their basement refinished. However its old and nasty down there.

What they want to do is basically build out the existing walls with a couple inches of concrete thus sealing the cracks.

The existing walls are made of old decrepid brick.

How can I build these walls out just a couple inches to seal them off using just plywood, and 2 x 4's to make concrete forms? What should I use as a fastener?
I have access to a Hitli DX 35.

I need to get an answer by tomorrow morning.
Thanks
 
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Old 04-02-08, 01:08 PM
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Hi and welcome to the forums!

I'm not sure I understand why you want to add a couple of inches of concrete to the walls...just to fill the cracks?

Tell me a couple of things, please...How old is the home?

Is there a sump pump?

Has the basement had water damage?

What will the refinished space be used for?

Is the foundation poured or block?

Connie
 
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Old 04-02-08, 01:54 PM
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"You can't" is the quick answer.
 
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Old 04-02-08, 01:59 PM
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Well, Tscar,

I was succinctly working my way toward that conclusion...I'm sure I'd have eventually suggested he repair the cracks and frame with 2x4 and drywall if he's looking for living space.

Your answer's much quicker though- certainly saves a lot of typing
 
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Old 04-02-08, 06:55 PM
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Thanks for the replies. I didnt see the replies at first, I didnt scroll down.

Basically yes its going to be living space. There has never been any water damage. I plan on framing with metal stud and then drywall.

Could I use drylock or something similar to at least patch any cracks just to make them happy?
 
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Old 04-03-08, 02:01 AM
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Good Morning,

Yes, I would fill any cracks with a waterproof sealant for concrete, then follow with an application of Drylock before framing.
 
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Old 04-03-08, 05:35 AM
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Should I still use a waterproof sealant for concrete, even though its brick?

Also how would I go about applying waterproof sealant?

And would drylock work in a paint spray machine?
 
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Old 04-03-08, 06:04 AM
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Thin sealers like thompson's water seal are best applied by spray, in a manner that floods the surface. Drylok is a much better choice for a basement!

Drylok is best applied with a brush and/or roller. It must be applied liberally!! For drylok to work it must completely cover [and be obsorbed by] the masonary. It must fill every crack and pore.

Drylok can be sprayed [providing the pump is strong enough] BUT it still must be worked into the substrate with a brush or roller.
 
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Old 04-03-08, 08:05 AM
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Okay, just so I'm sure we're all talking about the same thing...

First you fill the cracks with a concrete sealant (Like caulk)

Then you coat the walls with Drylock. Here's a product page:
http://www.ugl.com/drylokMasonry/mas...ofer/latex.php

Then you put up the studs. I'd check this, too- somewhere I read recently to leave a gap between the framing and the wall...something about air flow. I'll do a search later and let you know what I find.

Connie
 
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Old 04-03-08, 08:07 AM
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Concrete over old basement walls?

Drylok over old brick is better than nothing, but not much better. It is just another paint coating that does not resist any pressure.

Pouring a 2" thick wall will be almost impossible to do well because of the thicknes and difficulty in bonding to the old wall.

I am sure you have done all the necessary exterior measuers - grading and long (8-10') extensions.

If you do not have any signs of moisture, you can just set the new walls inside the existing walls.

If it is as bad as you say, I would definitely upgrade your heating and ventilating to makes sure you have enough air changes.

Dick
 
 

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