water stop in a expension joint (concrete slab) parkdeck

[BauTomTom]

Hi

I have a problem with a expansion joint in a concrete slab. The joint is 20mm and the slab is exposed to the outside. This means sun and rain.

Now we don't want that the cars below would get wet. Which kind of a water stop would you recommend. I drawn up four different types.

The cars will park parallel to the joint so that I don't need to consider the vehicle traffic over it.

My 1st favorite is Type B but am worry about the sun and the durability of the sealer

My 2nd favorite is Type A but my worry is about the water which would stay inside the gap. Can it effect the concrete?

 

[cdous]

The combinations of type B, A and D is what you need.
The water-stop may seem as overdesign but have in mind the serviceability requirements of a closed car-park....people wouldn't like drops either in their coats or their cars.

 

[hokie66]

Not an expert on this, but I have seen variations of your type D used. How do you have a joint parallel to the carparking spaces without it also crossing the aisles? The cars have to get there somehow.

It depends somewhat on the roof membrane you use. With liquid applied membranes, you probably need to use a sheet membrane over the joint, then protect it with a metal cover plate. Where I am, the cover plates are often profiled to also function as speed bumps.

 

[ahmedhegazi]

Joint should be completely filled (sealed with a compressible sealant)as your proposal type B but all the slab thickness.

you do not need any type of water stop ,if you insist you can use type A ,but at the end of the day when this joint will leak it has to be repaired.

Do you have finishes?

 

[rowingengineer]

we gave up on water stops a while ago and now just put in a half drain below the joint. easy to maintain and easy to install and test.

ANY FOOL CAN DESIGN A STRUCTURE. IT TAKES AN ENGINEER TO DESIGN A CONNECTION.”

 

[BauTomTom]

---to cdous---
The combination of this three? It could also run the danger, that if the water comes in, it will stay between the sealer and the water stop. Is this not dangerous?

---to hokie66---
I know it sounds weird but in this case the parking bays are really parallel to the joint. Where the cars cross the joint is somewhere else. This will be my 2nd question ?

---to ahmedhegazi---
But I wonder if you get this sealant in such dimensions. I know them only as such around 50mm high. We don’t have any finishes here in this case. At this spot where the cars will drive over it I would like to case two angle irons into the concrete edges. Actually I would like to use something similar like here

http://wbacorp.com/Products/ViewProductLine.aspx?ProductLineID=32

---to rowingengineer---
First of all I like this “ANY FOOL CAN DESIGN A STRUCTURE. IT TAKES AN ENGINEER TO DESIGN A CONNECTION."

Yes, the gutter is also the thing which I suggested the architect only that can’t provide to much slope in it. And the architects you know them, they don’t like this stuff

 

[ahmedhegazi]

First for the sealant you have to contact one of these suppliers and check there materials ,because every ones has got there limit for width and depth ,believe they will have solution for you to seal the joint.

Second ,you are absolutely right in providing protection as the one in the link, the edge of concrete subjected to weather and atmosphere will be very weak point and the corner can spill, you need something heavy duty ,just pay attention to rebar cover if you plan to post install this protection

 

[BauTomTom]

Have somebody worked with such systems befor already?

http://wbacorp.com/Products/ViewProductLine.aspx?ProductLineID=32

I actually like it very much. There are a lot of simmilar systems. My question is only how do the rubbe rlooks after 20 years? from all the rain and the sun?

BauTomTom

 

[hokie66]

After 20 years (depends on the environment, probably earlier), rubber exposed to UV light will be gone. If these joints are protected by "speed bump" type metal covers, they work fairly well, but still require maintenance.

 

[BauTomTom]

what about such a thing (see attachment) and then covered with a steel plate?

 

[BauTomTom]

so you say it should be definately covered with a steel plate? To cast the membran (as attached above) on top of the concrete it wouldn't work for to long?

BauTomTom