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KNOWLEDGE · MASONRY AND DAMP-PROOF COURSES

Injection cream: continuous borehole filling

The cream limits capillary rising damp. The correct damp-proof course level, an assessment of the masonry and application from the back of the hole form the basis of effective installation.

AssessmentProcedure and optionsSelection and next step

EXPLORE THE METHOD

InjectCream: from the damp-proof course layout to corners

The cross-section, hole layout, air cleaning and two application details guide you through installing a cream damp-proof course. Alternative approaches to corners are shown at the end — plan their layout before drilling. Prepare the holes with compressed air in accordance with the InjectCream instructions.

The cream damp-proof course follows a horizontal mortar joint. Blue arrows show rising moisture, while the white material in the hole indicates where the cream is applied.
Diagram key

Drill in the mortar joint. Hole diameter: Ø12 mm; horizontal spacing: 10 cm. The arrow along the hole marks a depth equal to wall thickness minus 4 cm. InjectCream fills the hole; CrackOn.5 identifies the hole-sealing material. Pump: PUMP INTEGRALE 800.

01 · PROCEDURE AND DETAILS

Establish the capillary barrier layout

Identify the cause of dampness, the wall construction and the appropriate damp-proof course level. The holes must create a continuous barrier against capillary rise, including corners and the floor junction. InjectCream does not replace waterproofing against water pressure on the wall; other sources of water require separate solutions.

The full cross-section combines three elements of the method: horizontal drilling into the mortar joint, applying cream along the hole and sealing the entrance with CrackOn.5 mortar. The dimension “wall thickness minus 4 cm” is one of the options shown. Before drilling, check it against the actual cross-section and the product instructions, which specify leaving 2–4 cm to the opposite face.

  • Confirm capillary rising damp.
  • Set out the damp-proof course at corners too.
  • Check continuity with the floor waterproofing.
Horizontal waterproofing continuity →InjectCream data sheet →
The entry points are in the mortar joint. The drawing shows a diameter of 12 mm; the InjectCream instructions specify a range of 12–14 mm.
Diagram key

Drill in the mortar joint: Ø12 mm holes at 10 cm horizontal spacing.

02 · PROCEDURE AND DETAILS

Drill horizontally into the mortar joint

For InjectCream, drill horizontal holes in the lowest suitable mortar joint, spaced 10 cm apart, with a diameter of 12–14 mm. Leave 2–4 cm to the opposite face. Check the actual depth of each hole so that the delivery tube can subsequently reach its end.

Adapt the layout to the masonry thickness, absorbency and construction. For low absorbency, the data sheet allows a second, staggered row 8–10 cm higher. This is a selection option, not a mandatory additional step. Where there are cavities, voids or multi-leaf walls, establish where the material will go; high consumption does not confirm a properly installed damp-proof course.

  • Drill horizontally into the mortar joint.
  • Check the actual borehole depth.
  • Assess voids before applying the material.
Application trial before injection →Calculate cream for the actual holes →
Before applying InjectCream, remove dust from the holes using compressed air. The drawing shows borehole preparation, with no cream yet applied.

03 · PROCEDURE AND DETAILS

Blow out the holes with compressed air

After drilling, blow out the holes with compressed air in accordance with the InjectCream instructions. In the drawing, the air stream symbol and pale dust cloud indicate borehole cleaning. Preparing all points systematically helps the tube subsequently reach the full depth and enables uniform filling to be checked.

Check that the holes are clear and verify their depth before applying the cream. If there is an obstruction or a newly discovered void, reassess the hole and cross-section; do not substitute increased material quantity for assessment. Mark prepared points to distinguish them from holes already filled.

  • Remove dust using compressed air.
  • Confirm clear access and depth.
  • Mark the holes ready for injection.
Preparation according to the InjectCream data sheet →
The tube reaches the end of the prepared borehole. It is gradually withdrawn during application so that the cream fills the entire hole length.
Diagram key

The double-headed arrow along the injection hole marks a depth equal to wall thickness minus 4 cm.

04 · PROCEDURE AND DETAILS

Inject from the back while withdrawing the tube

InjectCream is ready to use. Insert the tube to the full depth of the cleaned hole, then inject the cream while slowly withdrawing it. Filling from the back reduces the risk of an air pocket behind the material; merely sealing the borehole entrance with cream does not implement the method shown.

Monitor uniform application and material quantity, and mark completed holes. The label “masonry thickness minus 4 cm” shows the option in the drawing; the actual depth was established earlier. Keep separate quantity records for sections with different wall thicknesses.

  • Guide the tube to the end of the borehole.
  • Withdraw it during application.
  • Mark and record the filled holes.
Cream consumption for a section →How to apply InjectCream →
Filling the hole, sealing its entrance and the spread of cream through the substrate serve different functions. The pale zone illustrates how the capillary barrier works.

05 · PROCEDURE AND DETAILS

Seal the hole and assess damp-proof course continuity

After filling completely, seal the hole with CrackOn.5 mortar and level the surface according to the instructions. The grey seal at the face does not replace cream distributed through the masonry. In the diagram, the white zone inside the hole and its pale surroundings show application and the material's action in the target layer.

Check that the completed points form a continuous damp-proof course, including at corners and wall junctions. The cream limits capillary transport; it does not immediately remove existing moisture and salts. Further work includes suitable plaster, vapour-permeable finishes and ventilation; assess the effect at comparable locations and under comparable conditions.

  • Seal all completed holes.
  • Check corners and junctions.
  • Provide conditions for continued drying.
CrackOn.5 mortar →Damp-proof course continuity and acceptance →
The fan of holes shows access to the corner zone from inside. This is a geometrical option planned before drilling, not an additional step after a normal row.

06 · Corner access

Corner option: access from inside

With access from inside, a straight row of holes may not cover the entire wall corner zone. The fan shown directs boreholes into different parts of the corner so that the damp-proof course in one wall can join that in the other. The white lines represent borehole directions; they are not a dimensioned layout ready for every cross-section.

Before starting, determine the actual thickness of both walls, access and the length of each borehole. Use the same cleaning and cream application from the back as for a straight section. On completion, check that no moisture rise path remains in the corner.

  • Define the zone joining the two damp-proof courses.
  • Select lengths for each direction.
  • Monitor filling of all corner boreholes.
InjectCream requirements →Horizontal waterproofing continuity →
The second option uses outside access. Boreholes from both directions must cover the shared wall corner zone.

07 · Corner access

Corner option: access from outside

Where the outside of the corner is accessible, approaches from both walls can be planned according to the option shown. Their purpose is to maintain damp-proof course continuity where the wall changes direction. The intersecting white lines in the drawing illustrate overlapping borehole coverage in the corner; they do not mean that identical geometry must be reproduced in every wall.

Select the access option after assessing the cross-section and available access. Do not automatically install both corner layouts. Document actual directions and depths, mark the filled points and incorporate the corner inspection into acceptance of the entire damp-proof course.

  • Confirm that outside access is possible.
  • Cover the shared corner zone.
  • Record actual directions and depths.
Acceptance of the entire damp-proof course →Discuss an unusual cross-section →

First confirm capillary rising damp

Identify the masonry material, thickness, joints, voids and degree of dampness. Check other water sources: services, gutters, ground conditions and vertical waterproofing. InjectCream is intended to limit capillary rising damp; on its own it will not protect a wall from water pressure.

Establish the damp-proof course layout together with corners and the floor junction. Read how to maintain horizontal waterproofing continuity. Do not start with an easily accessible row of holes if it would create a barrier at the wrong level.

Geometry relates to the selected material

For InjectCream, the instructions specify horizontal holes in the mortar joint, a diameter of 12–14 mm and spacing of 10 cm. The depth usually leaves 2–4 cm to the opposite face. These are this product's guidelines; the actual layout must account for masonry thickness, absorbency and construction.

For low absorbency, the data sheet allows a second, staggered row. Multi-leaf, stone or hollow masonry requires an assessment of the material path. Do not inject cream into a void without control, assuming that the damp-proof course zone will be filled. Before applying InjectCream, blow out the holes with compressed air in accordance with the TDS.

From the back to the entrance, without air pockets

InjectCream is a ready-to-use material. Insert the delivery tube to the full depth of the prepared hole. Apply the cream while gradually withdrawing the tube so that the entire length is filled uniformly. Do not merely seal the entrance of the hole with cream.

This application method reduces the risk of leaving air behind the material. Monitor quantity and mark filled holes. After application, seal them with the specified mortar according to the product instructions. Calculate separate quantities for sections of different thickness.

What does the consumption calculator tell you?

Volume depends on the diameter, depth and number of holes. The calculator helps estimate the cream quantity for the assumed geometry, but does not identify voids or confirm damp-proof course continuity. If consumption is unusually high, inspect the cross-section instead of simply increasing the order.

Record actual dimensions, not just the nominal wall thickness. Separate the quantity required for the holes from the working allowance. The density used to convert to kilograms does not change the volume needed to fill them.

After application, the masonry still needs to dry

The cream creates a barrier in the capillary zone; it does not immediately remove moisture and salts accumulated in the masonry. Further work includes suitable plaster preparation, finishes and ventilation. Observe changes at comparable locations, rather than judging the effect solely by the appearance of a freshly repaired surface.

If dampness persists, check continuity at corners, floor junctions and possible water ingress above the damp-proof course. Material in every hole does not on its own confirm closure of the entire capillary path.

RESINBAU SELECTION

Site conditions determine the material

InjectCream →

Ready-to-use silane-siloxane cream for a damp-proof course against capillary rise, following assessment of the cross-section and correct level.

CrackOn.5 →

For sealing holes after application according to the instructions; it does not replace the cream's action in the masonry.

Calculate what you know

CALCULATORCalculate cream for the holes →

Enter the actual thickness, diameter, depth and damp-proof course length.

Next step

READ MOREDamp-proof course continuity →

Check corners, cross walls and the floor junction.

READ MOREA different saturation zone →

Distinguish a damp-proof course from sealing a three-dimensional wall zone.

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 ↗