Graphical Construction Glossary >> Temporary Work. >> shoring >> Underpinning Pressure Grout

Underpinning Pressure Grout
The stabilisation and adding new support to weakened foundations by pumping at high pressure a grout mixture under the footing to fill up voids in the subgrade. More correctly the term is Permeation Grouting.

sketch of pressure grout injection

Apart from trivial jobs where grout is poured into small cavities by hand, all grouting is done under pressure. The more accurate description of this type of underpinning would be permeation grouting

On porous foundation material is is often possible to inject a grout mixture into the subgrade and by pumping at high pressure, to force the grout into any voids and so stabilise the foundation and stop further sagging of the footings. This procedure will never lift foundation that have already dropped.

The grout can be plane sand and cement, but the preferred method is to use various additives to greater a stronger and non shrink product.

This procedure is simple and non invasive, but it is impossible to estimate accurately the quantities needed and hence the price for any particular job.

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Please Note! The information on this site is offered as a guide only!  When we are talking about areas where building regulations or safety regulations could exist,the information here could be wrong for your area.  It could be out of date!  Regulations breed faster than rabbits!
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