Framing exterior wall on existing concrete pad

secutanudu

I have a concrete pad in my breezeway with shoddy front and back walls. I want to tear these walls out and frame new walls. My plan is to either put a row of cinder blocks or pour a small wall, on top of which I'll put a PT sill plate and normal 2x6 walls.

If I pour or put blocks on the existing pad, will that form a good seal, or will water be able to seep throught the bottom? The other side of this wall is the driveway, the same level as the concrete pad inside.

Thoughts? Thanks.

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Andrew

jomama45

For an existing slab with a new curb, there is a product called "Sika-swell" that works extremely well at protecting the cold joint from water entry. Hopefully, you can find it at a supplier near you. And, it isn't cheap either, but it is certainly worth the price considering what it cost to repair water damaged materials.

Bicoronal

I have a similar problem with a breezeway (it is an enclosed connection from the house to a garage). However, the breezeway was built on a slab without footings, allowed in the 1950's but not now. I had the building inspector over to discuss possible remodeling options. Basically, if I tear down any structure to rebuild, I would be required to pull up the slab and pour footings.

You might want to look into this.

secutanudu

So that Sika-Swell product...how is it applied? Do I simply put it down on the existing pad before pouring the curb over it?

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Andrew

jomama45

The Sika-swell S2 comes in a small 10 oz. caulk tube IIRC.

You simply put it on the existing concrete shortly before you pour. You'll have to read the specs on tube, but I think you have to pour over it within an hour or so.

JustADoc

jomama45 would that product also be utilized for a run of concrete block on top of an existing foundation? Or would the mortar bed itself be enough?

secutanudu

How is Sika-swell applied? I don't mean what tool is used (I assume a caulk gun or similar). I mean how much, and in what pattern? Straight lines? Sine-wave?

Also...this wall will butt up against my the exterior brick of my house...how do I seal that stud up against the brick? Caulk between the 2x6 and the house? Something else? Or will the siding take care of that?

Thanks.

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Andrew

secutanudu

I found this on the Sika website:
http://us01.webdms.sika.com/fileshow.do?documentID=313

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Andrew

jomama45

That tells you pretty much everything you need to know about it, except that's info for the 20 oz "sausage" package, which requires a special bulk caulk gun. That's the only way I've used it professionally, and I own the gun, but I thought they indeed sold it in a 10 oz caulk tube as well. I could have been mistaken, but it may be worth contacting the company, or a local dealer, to see if it's available so you can save the money on the specialized application gun.

secutanudu

Thanks.

What about the 2x6 <--> brick and mortar joint?

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Andrew

secutanudu

I am having trouble finding a distributor who sells SikaSwell - one place said they have this product, seems similar...thoughts?

http://www.cetco.co.in/pdfs/Waterstop-RX%20Brochure.pdf

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Andrew

jomama45

If I'm understanding correctly, caulk should do fine.


Sure, but that stuff is from Mumbai........

secutanudu

I can't find anywhere that'll sell me one tube of sika-swell....it's by the case only. Any idea on where I can get it?

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Andrew

jomama45

Now that I think of it, I may have bought a case of it, but can't remember. I know if i leaned on my suppliers a little, I could get a mere one tube.

You may want to try a local poured foundation contractor. ANy of them that get into sizable commercial jobs will certainly have it, or a similar product. They may be willing to sell you one tube.........