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KNOWLEDGE · MASONRY AND STRUCTURAL REPAIR

Helical anchors: interaction of bar, grout and masonry

The anchor must transfer forces through grout into sound masonry on both sides of the crack. The chase layout and installation follow the repair design.

AssessmentProcedure and optionsSelection and next step

EXPLORE THE METHOD

Helical anchors: from the repair layout to complete bar encapsulation

The anchor transfers forces through grout into sound masonry on both sides of the crack. The sequence shows this interaction, chase preparation and installation in AnkerBau. At the end are two separate corner options. Their geometry is selected by the repair design; they are not further mandatory stages of the same work.

General repair diagram: grout surrounds the bar and connects it to the prepared masonry. The equipment creates the designed connection.

01 · Assessment

The whole system: masonry, anchor and grout must interact

Trace the force path: from one part of the masonry through grout to the anchor, then into masonry on the other side of the crack. A bar in a chase alone is insufficient. Suitable anchorage, continuous encapsulation and a substrate able to interact with the grout are required.

Before selecting the layout, identify the cause of cracking, condition of masonry units and joints, and damage activity. Stitching a crack does not itself remove the cause of settlement or overloading. The design defines the connection's task, geometry and inspection; AnkerBau is a grout for installing helical anchors in such a masonry repair system.

  • Establish whether the cracking cause remains active.
  • Check masonry condition in the planned anchorage zones.
  • Relate the anchor layout to the task defined in the design.
AnkerBau — anchor installation grout →When cracking results from changed support →
Labels on the left and right refer to lengths on both sides of the crack. The vertical dimension describes spacing between anchor levels.

02 · Assessment

Read the lengths on both sides of the crack

Distinguish the length on one side of the crack from the whole anchor length. The label 500 mm (300 mm) refers to lengths on each side for brick masonry and concrete respectively. Vertical spacing of 300–450 mm represents the levels in the option shown. These dimensions explain its geometry; they require design selection for the wall being repaired.

Transfer the design layout to the wall, accounting for openings, edges, corners and joint condition. Anchorage length, chase depth and cover must form one compatible detail. The grout calculator helps only after this geometry is defined; it does not select anchor quantity or repair load-bearing capacity.

  • Do not read the dimension on one side as the total bar length.
  • Account for anchorage zone interruptions by an opening or edge.
  • Enter the geometry adopted in the repair design into the calculation.
Grout consumption for the designed chases →
Chases cross the crack and continue into the anchorage zone. Their dimensions must allow subsequent bar encapsulation.

03 · Installation

Form chases in the planned masonry zone

Set out and form chases according to the selected layout. Check their actual length, depth and path on both sides of the crack. Space for the bar must account for the first and second grout layers, not just the anchor diameter.

As joints are opened, assess the exposed masonry. A crumbled joint or local void may change installation conditions from the surface assessment. Address such locations when preparing the detail before covering them with grout.

  • Compare completed chases with the design and mark deviations.
  • Check substrate continuity along the anchorage length.
  • Leave room for encapsulation, not just the bar.
AnkerBau — substrate preparation →Grout quantities after measuring chases →
First cleaning stage: blowing out chases removes debris from cutting. The arrows in this illustration do not indicate dampening.

04 · Installation

Remove dust and loose debris from the chase

Clean the entire chase length, including its ends and near the crack. AnkerBau instructions specify blowing out with compressed air. Dust and loose debris must not form a layer separating grout from sound substrate.

After cleaning, inspect edges and the interior again. Unfilled joints or fragments loosened during chase cutting are now easier to see. The next stage is preparing substrate moisture, shown in the following illustration.

  • Check cleanliness at the chase ends too.
  • Remove detached fragments revealed after blowing out.
  • Distinguish dust removal from subsequent dampening.
AnkerBau — preparation before application →
Water prepares the absorbent substrate for contact with grout. Remove excess before installing the anchor.

05 · Installation

Dampen the substrate, remove excess water and prepare the grout

AnkerBau instructions require dampening the anchorage location and removing excess water. Repeat dampening for highly absorbent masonry. Check the entire chase length: the surface should not contain both dry, highly absorbent areas and places with accumulated water.

Prepare the grout according to the product instructions, following component addition order, mixing, maturation and remixing. Select a batch size suited to application capacity at the working temperature. Additional water is not a way to extend working time arbitrarily or improve the pumpability of an already prepared batch.

  • Remove excess water from the prepared area.
  • For high absorbency, check whether dampening must be repeated.
  • Follow the AnkerBau formulation and preparation sequence.
AnkerBau — mixing and application conditions →
The first layer supports the bar and contacts the chase interior. Dimensions refer to the detail shown.

06 · Installation

Apply a continuous first layer of AnkerBau

Apply the first AnkerBau layer to the prepared substrate, maintaining continuity along the entire anchorage length. Grout must reach the chase interior and ends. Leave room for bar installation and the second layer that completes encapsulation.

Before inserting the anchor, check first-layer contact with the substrate, especially at irregularities and chase ends. The 35–55 mm and 12 mm labels explain this cross-section's geometry; actual chase and layer dimensions must match the repair design.

  • Maintain first-layer continuity at the ends too.
  • Check grout contact with the prepared substrate.
  • Leave room for the bar and second layer.
AnkerBau — applying the first layer →Grout consumption according to chase geometry →
Pressing embeds the bar in the grout. The anchor must retain its designed path and room for subsequent front cover.
Diagram key

The helical bar is the anchor; the tool below presses it into the mortar. The horizontal arrow marks a groove depth of 35–55 mm; the vertical arrow marks a groove height of 12 mm.

07 · Installation

Press the anchor into the first layer

Place the anchor in the first layer and press it into the designed position. Check both anchorage ends and the crossing of the crack. Simply placing a bar in an empty chase does not provide grout contact or force transfer into the masonry.

If the system includes stabilising components, use them to maintain position during further filling. Before applying the second layer, check the anchor path and remaining space for cover. Do not move the bar towards the surface merely to make an uneven chase easier to cover.

  • Confirm position and both anchorage ends.
  • Check bar embedment in grout along the entire accessible length.
  • Retain room for the second encapsulation layer.
AnkerBau — anchor installation and stabilisation →
The second layer completes bar encapsulation. Grout continuity and anchor position must be confirmed before covering the repair.

08 · Installation

Complete encapsulation and check the connection before finishing

Apply the second AnkerBau layer, completing bar encapsulation without voids. Check filling at the ends and where the crack is crossed. Grout must provide continuous contact with the anchor and prepared masonry; a surface levelling layer does not replace filling the chase interior.

Before covering, document bar positions, anchorage ends and filling continuity. The open crack itself requires separate filling compatible with the repair; this is not the same as anchor encapsulation. Maintain AnkerBau curing conditions and start finishing only when permitted by the instructions and design.

  • Check grout beneath and around the bar and at the ends.
  • Confirm anchor position before finishing.
  • Separate installation acceptance from subsequent crack monitoring.
AnkerBau — installation and curing →Grout consumption for anchor installation →
A separate corner detail: the anchorage path follows both legs. It is not an additional mandatory stage of a straight wall repair.

09 · Alternative corner details

Corner option A: anchor along a chase

In this option, the anchor passes around the wall corner in a prepared chase. Check anchorage continuity on both legs and room for cover at the corner itself. The length visible on one face does not describe the entire bar path.

The 500 mm labels describe this option. The design must account for masonry layout, crack position, corner condition and access to prepare both legs. Cleaning, dampening and complete encapsulation remain part of this detail; the next illustration shows another access option, not its mandatory continuation.

  • Check preparation of both corner legs.
  • Maintain the planned anchorage and cover around the corner.
  • Do not combine both corner options without a design.
AnkerBau — installation in prepared substrate →Grout quantities in chases →
The borehole alternative changes the installation path at the corner. The 45° and 500 mm labels describe this option's geometry.

10 · Alternative corner details

Corner option B: anchorage with a borehole

This detail shows the transition from a chase to a borehole at a corner. Before installation, establish where the hole must end and which sound masonry zone will receive forces through the grout. Maintaining the diagram's angle alone does not confirm anchorage length or appropriate edge distance.

Like the chase, the hole requires cleaning, moisture preparation and filling without voids. Confirm the actual direction, depth and installation before covering. Selection between this option and an anchor running around the corner follows the design and actual masonry arrangement.

  • Confirm the borehole end location in the assessed cross-section.
  • Check grout continuity at the chase–hole transition.
  • Document geometry and installation before covering.
AnkerBau — anchorage hole preparation →

Crack stitching starts with the cause

Check the crack path, masonry unit and joint condition, wall thickness and changes in support and loading. Establish whether damage is still developing. Anchors alone do not remove settlement or overloading causes.

The repair design defines the connection task, anchorage lengths, layout and number of levels, corners and inspection method. Do not select the entire system solely from crack width or one catalogue illustration.

The bar acts through its surroundings

Forces from the masonry must transfer into the grout and anchor, then into masonry on the other side of the damage. Substrate condition, chase geometry, required anchorage and continuous encapsulation matter. A bar placed in an empty chase alone does not create the connection shown in the diagram.

Lengths and spacing in the drawings relate to source options. They are not automatically parameters for every masonry repair. At corners and openings, consider the actual force transfer path.

Prepare the substrate for the grout

Form chases or holes according to the design. Remove dust and loose debris. For AnkerBau, instructions specify dampening the substrate and removing excess water; highly absorbent substrates require particular attention.

Prepare grout with the correct water quantity and follow the specified mixing and maturation sequence. Do not improve pumping convenience by arbitrary water additions. The application tool must enable chase filling without leaving voids.

First layer, anchor, complete encapsulation

Apply the first grout layer into the prepared chase, install the anchor at the specified depth and apply the next layer. Stabilising components used must maintain bar position during filling. Check cover at corners and direction changes too.

Maintain the system's curing conditions and specified time before further work. Covering too early may prevent geometry and installation checks, so document successive stages.

A grout calculation does not design anchorage

The calculator helps estimate grout quantity from chase geometry and the assumed anchor layout. It does not determine load-bearing capacity, anchorage length or the number of bars needed to carry forces. These values come from the design.

During acceptance, check the completed layout, substrate condition, grout preparation and encapsulation continuity. Retain photographs before covering and location labels. Adapt subsequent crack monitoring to the reason for repair.

RESINBAU SELECTION

Site conditions determine the material

AnkerBau →

Grout for installing helical anchors in a masonry repair system. Its use requires suitable geometry, substrate preparation and complete bar encapsulation.

Calculate what you know

CALCULATORAnchor grout consumption →

Calculate material for the design layout; the result is not a load-bearing capacity calculation.

Next step

READ MOREDamage assessment →

Distinguish the symptom from the cause that must be addressed in the repair.

READ MOREStructural support →

Where cracking relates to settlement.

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 ↗