Liquid Backfill

What is Liquid Backfill?


An impervious pumpable clay-base material used to raise settled landscape grading conditions around foundations, to fill voids and cavities, and to be used to fill new excavations to prevent future grade settlement and water problems.


Liquid Backfill is a solution for:



  • Foundations shifting and cracking

  • Settlement of patios, driveways and walks

  • Heaving and cracking of basement floors


Proper Application is Important


Many people fail to recognize the major importance of proper 'backfilling' around their foundations and in trenches, etc. as the key to a sustainable foundation. Wildly shifting foundations, landscape damage and water damage are the unavoidable results of neglected backfilling standards​


It is important that you are aware of the significance backfilling will have on the long term stability of your foundation and the pay back you save on repair costs. Everyone strives to use low maintenance construction techniques and products, and proper backfilling goes a long way in providing this lowered maintenance condition. Almost all maintenance problems can, in some way, be attributed to the direct or indirect effects of backfill settlement.


Contrary to many beliefs, weeping tile, in an expansive clay zone, can create greater problems than it solves. Weeping tile, not properly installed sloping to a sump pit, creates numerous low spots that continually trap water into ponding runs which then gradually, over a period of time, undermine the foundation.


Foundations, on expansive clay, settle as a result of three significant actions:



  • The weight of foundations can progressively sink in a water softened bearing soil. (Similar to stepping in the mud).

  • Expansive clay can progressively be laterally excreted out from underneath the footing of a foundation. This action is especially prevalent after flash rains and floods.

  • A third problem relates to a likelihood of large accumulations of tree roots in search of high moisture weeping tile zones. Desiccation and shrinkage of the bearing soil then would follow to further aggravate the problem.


It is very important that the moisture condition at the depth of footings is maintained at a consistent moisture level, similar to the original moisture condition at the time of excavation. Complying with this simple rule will ensure a stable ground and foundation condition.


As industry experts, we believe that Top Soil is NOT proper material for grading or Backfilling. This is why:



  • A large percentage of soil is composed of organic material, therefore in a relatively short period, this organic material decomposes and settlement occurs.

  • Top Soil cannot be compacted properly.

  • Top Soil does not shed water as it becomes saturated the excess water runs through it and back towards the foundation, following the original negative underlying grade.


Read our article here