“Weeping walls" can be impregnated gently with slower curing mixtures of resin. The water is effectively pushed out of the wall as the expanding resin “freezes” forming a waterproof structure inside brickwork and replacing water and lost grouting.
As this barrier cures, the pressurised resin bleeds backwards to the near side of the wall where it leaks out of every nook and cranny as it forces the water from the wall. The curing resin is shown dribbling down the wall. These white rubbery streams are easily removed when the resin solidifies.
After six months the wall is now dry and happy. The whole building is far more airy and theres a feeling of warmth in the place that’s never been there before.
The team from Oxford Hydrotechnics injected a hydrophobic resin that is thinner than water into the structure of the wall. This is a common cure for serious leaks in tunnelling applications encountering subterranean water.
The resin can be brewed to cure at different rates. When the resin meets water it reacts by rapidly expanding up to twenty-fold in volume. Big leaks can be quenched instantly by quick acting resin that forms a waterproof flexible foam that fills large voids and blocks large holes.