hoosier inspector Posted July 12, 2009 Report Share Posted July 12, 2009 Why are some sump liners perforated, and some solid with only the perimeter drain entering? Link to comment Share on other sites More sharing options...
Jerry Simon Posted July 12, 2009 Report Share Posted July 12, 2009 Why are some sump liners perforated, and some solid with only the perimeter drain entering? We used to perforate them when first installing so they wouldn't rise/shift out of proper position (from ground water pressure) before the basement floor was poured and held them in place; ground water could thus seep into the pit instead of shifting the pit. After that, the perforations, while not really necessary, would still help water from under the slab more readily enter the pit, especially when only exterior foundation drain tiles were installed versus interior & exterior tiles. Link to comment Share on other sites More sharing options...
Garet Posted July 12, 2009 Report Share Posted July 12, 2009 In my part of the world... The solid ones with drain pipes entering were installed during original construction. The perforated ones with no drain pipes were retrofits, and only drain the immediate are around the sump. Link to comment Share on other sites More sharing options...
hoosier inspector Posted July 12, 2009 Author Report Share Posted July 12, 2009 Thank you. Link to comment Share on other sites More sharing options...
kurt Posted July 12, 2009 Report Share Posted July 12, 2009 Hopefully, the perforations are oriented downwards, not up, like I see about 3/4's of the time. Link to comment Share on other sites More sharing options...
RobC Posted July 12, 2009 Report Share Posted July 12, 2009 Would anyone have a picture of a perforated sump pit? I've never seen one perforated and where are the perforations? Wouldn't that somehow short cycle the pump? Link to comment Share on other sites More sharing options...
Garet Posted July 12, 2009 Report Share Posted July 12, 2009 Would anyone have a picture of a perforated sump pit? I've never seen one perforated and where are the perforations? Wouldn't that somehow short cycle the pump? Every one of them will look different, since they are typically installed by weekend warriors with a hand drill. Holes are typically on the side and bottom. Yes it's only going to pump out the volume of water in the sump and surrounding gravel; then it will sit for a period of time while water drains out of the surrounding soil into the pit. Is that what you mean by 'short cycle'? The length of time between pumping cycles would vary greatly depending on soil conditions and geometry. Link to comment Share on other sites More sharing options...
Brandon Whitmore Posted July 12, 2009 Report Share Posted July 12, 2009 Would anyone have a picture of a perforated sump pit? I'm fairly positive that Kurt was talking about the the pipe and not the pit. Link to comment Share on other sites More sharing options...
kurt Posted July 13, 2009 Report Share Posted July 13, 2009 I was talking about the pipe, but I see a lot of perforated pits too. Link to comment Share on other sites More sharing options...
Bryan Posted July 13, 2009 Report Share Posted July 13, 2009 Here are photos of two perforated pits that are used by a local basement and crawl space company. Click to Enlarge 38.17 KB Click to Enlarge 20.36 KB Bryan Link to comment Share on other sites More sharing options...
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