7 Things To Consider Before Backfill A Foundation

backfill foundation

During the construction, foundation is found at the bottom of the structure that receives the load distributed from different structural elements considering that its weight over the area of soil does not exceed the ultimate bearing capacity of the soil underneath and that the settlement over time is within tolerable limits.

The purpose of foundation aside from distributing the weight of the structure evenly over the large area of soil are to increase the stability of the structure, resists or prevents any soil movement effect which avoids unequal settlement and to provide a level surface for the structure.

To design a foundation, there are factors that you should consider and must not ignore to ensure the performance of the foundation or not bear any problems in the future.

  1. Footing depth or spacing
  2. Type of soil (sand & slit)
  3. Water table fluctuation
  4. Soil Settlement

These are the basic requirement to know that will make sure that it can support all kind of loadings it will bear as designed. In this section, we will be discussing other important and practical matters in foundation design.

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What does it mean to backfill a foundation

The construction process begins with the excavation, a lot of digging works depending on how big the structure is. The excavated soil are then set aside to be used on the later stage. These are stockpiled and secured that no foreign elements will affect it.

Alongside with the ground works, the excavated material will be tested to determine the actual soil type and properties which will determine if it can be used or placed back or if not, another soil to be used in backfill will be necessary to match with the structural requirement.

The factors that affect your backfill material are:

  1. Choosing the suitable backfill material
  2. Compacting the suitable backfill material and
  3. The time it takes to backfill the area.

Backfilling a foundation is an important process to help protect the structural element. To ensure that the backfill material is right make sure to check if the material sample passed the testing or is approved, required density is achieved and that it is done in layers.

How Long Should Foundation Cure Before Backfilling

How long should foundation cure before backfilling

After the concreting works, there are things that needs to consider before proceeding with the backfilling. One of which is if the load of the backfill material exerts or imposes heavy loading or force towards the foundation.

The backfill material should not significantly affect or cause the structural deterioration or cracks on the foundation. Though some contractors would not necessary wait for 28 days to achieve the foundation’s full design strength or complete hardness, it is safe to wait up to a week or at least 75% of the strength is fulfilled, considering that it is within ideal site temperature condition.

Curing of the foundation is an essential process and should not be hurried for the backfilling process as it imposes and a controlling factor whether the structure will be in its designed stability.

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