When the CAUSE of the cracks or a basement wall bowing inward is in part or all due to expansive/clay soils then....here is what OTHERS tell you to do
Fairfax County Virginia,scroll down to ---BASEMENT WALLS http://www.fairfaxcounty.gov/DPWES/publications/marineclay.htm
-Cause,Resolution
THEY say, "Depending on the extent of damage,foundation walls MAY need to be replaced while OTHERS can be repaired.To PREVENT FUTURE damage,the clay MUST be REMOVED and REPLACED with sandy or gravelly soils" ......and waterproofed on the outside!
U S Army Corps of Engineers http://www.lrb.usace.army.mil/AmherstSoilStudy/photos/photos.html
Pic 1. Lateral pressure CAUSING typical 45 degree stair step crack in block basement wall
Pic 2. Lateral pressure causing vertical mid span crack
Pic 3. Lateral pressure causing top of basement wall to bow inward 9 inches.Pilasters FAILED to BRACE wall.
Carbon straps etc on the inside do not remove exterior weight/pressure against the wall,doesn`t relieve any weight/pressure and inside systems do not repair/waterproof EXTERIOR cracks in block walls.And sometimes there are OTHER weights/pressure against the outside of the wall such as, underground ROOTS or a porch footing or concrete slabs.
Underground ROOT that CAUSED exterior cracks in block wall which then allowed water to enter the basement. http://www2.snapfish.com/slideshow/AlbumID=288770686/PictureID=6952552252/a=122238283_111847456
Underground root,under the driveway,against basement wall where there is a crack in wall,where it leaks http://www2.snapfish.com/slideshow/AlbumID=640532013/PictureID=19465277013/a=122238283_111847456
CLAY and some of the roots that caused exterior cracks and loose-cracked parging on the exterior block wall,allowed water to enter which caused mold,efflorescence on inside basement wall http://www2.snapfish.com/slideshow/AlbumID=1319433013/PictureID=44984440013/a=122238283_111847456
Scroll down a little to WATERPROOFING..... http://www.chicagotribune.com/business/chi-basement-remodel_chomes_0919sep19,0,6134261.story
Tells ya, "Be prepared to weed through an array of proposals from waterproofing contractors-A lot of THEM Bogus...." |
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