Water retaining structure joining existing building
Water retaining structure joining existing building
(OP)
Hi there,
I have a flood defence wall (concrete) which is butting up to my existing building (reinforced hollow core block wall, rendered with waterproof render). I need to form a joint between the new concrete wall and the existing building and I'm looking for the best way to do this. The only time the joint will have water pressure is when the river floods and this will be a weak point. Any suggestions? I thought at first maybe just a 12mm expanding board sealed with polyurethane sealant but I think this could pop out under pressure? the retained height of water from the base of the wall is 1.3m. Any help would be greatly appreciated. Thanks
I have a flood defence wall (concrete) which is butting up to my existing building (reinforced hollow core block wall, rendered with waterproof render). I need to form a joint between the new concrete wall and the existing building and I'm looking for the best way to do this. The only time the joint will have water pressure is when the river floods and this will be a weak point. Any suggestions? I thought at first maybe just a 12mm expanding board sealed with polyurethane sealant but I think this could pop out under pressure? the retained height of water from the base of the wall is 1.3m. Any help would be greatly appreciated. Thanks






RE: Water retaining structure joining existing building
RE: Water retaining structure joining existing building
Mike McCann, PE, SE (WA)
RE: Water retaining structure joining existing building
RE: Water retaining structure joining existing building
The EPS sheets could be perhaps 1 to 2 inches thick (25 to 50mm).
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RE: Water retaining structure joining existing building
RE: Water retaining structure joining existing building
That would help visualize the situation.
Mike McCann, PE, SE (WA)
RE: Water retaining structure joining existing building
RE: Water retaining structure joining existing building
Cut some sort of a expanding rubber water stop into the existing conc. blk. wall and then cast the new conc. wall around the other half of the water stop. Then fill and caulk the rest of the joint btwn. the two walls as your detail shows.
RE: Water retaining structure joining existing building
Mike McCann, PE, SE (WA)
RE: Water retaining structure joining existing building
RE: Water retaining structure joining existing building
dhengr I thought about a water bar but didn't know if we would be able to cut a channel in the existing blocks and get a tight seal with a water bar? I know if it was new concrete on both sides that would be easy to do and just cast the concrete around it?
hokie66 do you think the joint would hold under pressure of water after a year of wear and tear say?
thanks everyone
RE: Water retaining structure joining existing building
Yes, it will last much longer than that. Of course, the joint must be properly made as to preparation, priming, geometry etc.
RE: Water retaining structure joining existing building
thanks for all your help and suggestions
RE: Water retaining structure joining existing building
RE: Water retaining structure joining existing building
RE: Water retaining structure joining existing building
Hi Oldestguy, there are no movement joints as such along the concrete wall as the wall changes direction a lot along the length, the person who designed the wall said the steel reinforcement has been designed to take care of thermal movement. The joint I've provided is meant to keep the 2 structures separate whilst providing a water tight joint. Hopefully I've achieved this!
RE: Water retaining structure joining existing building
What if you pour a short stub wall of concrete connected to the masonry wall, then put in a flexible bulbed waterstop between the stub and the rest of the wall? Could leave the required gap to accommodate movement.