KNOWLEDGE · MASONRY AND SEALING

Structural injection: wall saturation

Where water uses a network of pores, joints and local voids, one line of holes near the leak may not be enough. Plan a three-dimensional sealing zone inside the wall.

Assessment Procedure and options Selection and next step

EXPLORE THE METHOD

Wall saturation: cross-section, grid and inspection

Two views of the same method show how to relate the target zone deep within the wall to the points on its face. The yellow area marks the intended saturation zone; neither the drawing alone nor material in one adjacent hole confirms sealing of the entire cross-section.

Full cross-section of a wall next to the ground with boreholes at different angles and yellow saturation zones within the masonry. — Structural injection must cover the assessed zone inside the wall. The 90° and 45° boreholes illustrate alternative access options, not a mandatory pair of operations.

01 · PROCEDURE AND DETAILS

First define the zone inside the wall

Trace the water path from the ground side into pores, joints and possible voids. In the diagram, blue drops show water outside the wall and yellow zones show injection material distribution in the masonry. Establish wall thickness, layers and repair boundaries before choosing hole depths. Curtain injection has a different objective: introducing material behind the structure.

Adapt the perpendicular and angled approaches shown to the assessed cross-section. The trial must confirm whether the material reaches and remains in the planned zone. Larger voids require separate assessment and possible preparation before saturation. Sealing the wall structure does not itself confirm restoration of its load-bearing capacity. HydroGum and EasyInject can be considered after individual selection and a trial confirming material distribution, water availability for reaction and the ability to confine expansion. Do not treat them as automatically interchangeable with another saturation method.

Identify layers, voids and water inflow.
Define the borehole end zone.
Confirm material spread in a trial.

Application trial before injection →Compare wall saturation with curtain injection →HydroGum — conditional selection →EasyInject — conditional selection →

Front view of masonry with staggered hole rows, grid dimensions and an indication of drilling into the brick. — Drill into the bricks. Hole diameter: Ø12 mm. The vertical arrows show 15–25 cm between rows; the horizontal arrows show 10–15 cm spacing within each row and a 5–7 cm stagger between rows. — The front view complements the cross-section: it shows hole entrances, not full material coverage. In the masonry shown, boreholes pass through the solid brick material.
**Diagram key**
Drill into the bricks. Hole diameter: Ø12 mm. The vertical arrows show 15–25 cm between rows; the horizontal arrows show 10–15 cm spacing within each row and a 5–7 cm stagger between rows.

02 · PROCEDURE AND DETAILS

Set out the grid and inject from the bottom

Set out the grid while the brick and mortar joint layout is still visible. The option shown has spacing of 10–15 cm, row spacing of 15–25 cm, an offset of 5–7 cm and a diameter of 12 mm. These labels explain a specific diagram; select actual geometry, packer installation and hole preparation for the masonry and material confirmed by the trial.

After preparing holes and restricting uncontrolled escape paths, start at the lowest row. Inject sequentially along it, observing uptake, adjacent points and discharges at the face, then move upwards. Record deviations: rapid communication along a single joint may leave other zones unsaturated, while high uptake may indicate a void. After work, also check repair boundaries and connections to other waterproofing.

Maintain a clear record of rows and completed points.
Observe uptake and communication during injection.
Check the zone boundaries, not only the wet face.

Pressure and observation →Cleaning the system after the selected material →

Assess the cross-section, not just the wet surface

Check whether the wall is homogeneous, multi-layered, masonry or honeycombed concrete. Establish thickness, joint condition, voids and the water ingress path. Water may use connections between layers that are not visible at the face.

In this application, “structural injection” means saturating and sealing the wall structure. It does not automatically declare restoration of load-bearing capacity. If the element's structural interaction must be restored, the design separately specifies the material, required properties and acceptance method.

Inside the wall or behind it?

In saturation, the material must remain in the assessed cross-sectional zone and form a continuous seal that limits water flow. In curtain injection the target zone lies outside the structure. The difference affects hole depth, inspection method and quantities. Drilling right through the wall may change the path of the injected material.

Distinguish a larger void from a fine pore network. A cavity may absorb a large amount of low-viscosity material before it reaches an adjacent zone. It may need separate preparation or filling before the surrounding substrate is saturated.

The grid must cover the right zone

Prepare the surface and close uncontrolled escape paths while retaining planned observation points. Adapt boreholes to the masonry, layers and target zone. An angle or spacing variant in a drawing is a reference for a trial, not a rule for every masonry material.

While drilling, record voids, changes in resistance and the condition of drill cuttings. Clean holes appropriately for the selected material and install packers in a substrate that provides a stable seal. Weak masonry requires adapted installation and injection; tighter fastening does not replace a sound anchorage zone.

Assess saturation in three dimensions

On a trial section, observe uptake, communication and discharge locations. Resin may connect two points along a single mortar joint while leaving an adjacent layer unsaturated. The inspection plan should therefore include the depth and boundaries of the zone, not only the grid visible on the facade.

High uptake without expected progress requires checking for voids or escape beyond the wall. A pressure rise without uptake may indicate blockage or lack of connection. Use the trial to adjust sections, reaction time and point layout.

Assess sealing together with adjacent water paths

Document zones with different uptake and the adjustments made. Check connections to the damp-proof course, floor waterproofing, corners and penetrations. Disappearance of leakage at one face may mean the water path has shifted.

For a sealing repair, plan inspection under representative moisture and water pressure conditions. For a structural repair, carry out acceptance as specified in the design; the injected quantity alone does not confirm the required structural interaction of the wall.

RESINBAU SELECTION

Calculate what you know

CALCULATORMaterial quantities →

Masonry volume is not injection material volume. Base consumption on assessment and a trial.

CALCULATORPreparing mixtures →

Select the material and variant appropriate to the method.

Next step

Check which side of the wall needs the seal.

READ MOREDamp-proof course continuity →

Combine wall repair with reducing capillary rising damp.

Discuss your project conditions

Prepare a cross-section, a description of water and movement, and results of previous trials. ResinBau helps select the material and application method.

Discuss your project / technical selection ↗