Repair Systems — 03 — Facade & External Envelope
Stainless rod epoxy grouted systems
Technical product reference for stainless rod epoxy grouted crack stitching systems for masonry facade remediation on Australian Class 2 strata buildings. Grade 316 stainless threaded or deformed rod is installed into drilled channels cut through the masonry and grouted with a structural epoxy resin — providing higher tensile capacity than helical bar bed joint stitching, used for wider cracks, structurally loaded zones and situations requiring through-wall stitching. Structural engineer specification is mandatory.
What are stainless rod epoxy-grouted crack stitching systems?
Stainless rod epoxy-grouted crack stitching systems bond grade 316 stainless steel rods — threaded, deformed, or smooth — into drilled bore holes using two-part epoxy or vinylester injection adhesive. They are a higher-capacity alternative to helical bar crack stitching, used where the engineer requires greater tensile or shear capacity across the crack plane than helical bars can provide.
Product Reference
3 product systems — stainless rod epoxy-grouted crack stitching — scroll to view all
316 SS M10 threaded rod + Sika AnchorFix-3+ two-part epoxy
Epoxy-bonded stainless threaded rod crack stitching — Sika AnchorFix-3+ — solid masonry — AS 3700
System Description
316 SS M10 threaded rod bonded into drilled holes on each side of a masonry crack using Sika AnchorFix-3+ high-strength two-part epoxy adhesive. The threaded profile maximises mechanical interlock with the epoxy — higher pull-out capacity than smooth or deformed bar for the same bore diameter. Used for higher-capacity crack stitching in solid masonry where helical bar stitching is insufficient for the engineer's design load. Installation: bore holes drilled perpendicular to the crack face at specified depth, epoxy injected from the base of the bore upward, rod inserted with slight rotation to distribute epoxy, excess removed before gel. Pot life approximately 8–10 minutes at 20°C — work must be completed within pot life. Full cure 24 hours at 20°C; extended in cold conditions. Damp-tolerant formulation — Sika AnchorFix-3+ performs in slightly damp bore holes. Engineer specification mandatory. Bore hole cleaning is the most critical installation step.
Technical Properties
- Threaded rod profile provides maximum mechanical interlock with epoxy — high pull-out capacity per unit anchorage depth
- Sika AnchorFix-3+ is a proven, widely used two-part high-strength epoxy with excellent bond to masonry
- 316 SS — suitable for all exposure zones including coastal and marine environments
Limitations
- Structural work — engineer specification mandatory; pull-out design values must be verified for the specific masonry
- Crack must be stable before stitching — epoxy rod is rigid and does not accommodate ongoing movement
- Bore hole cleaning is critical — dust and loose material prevent epoxy bond; blow, wire brush, blow again
PROCUREMENT SOURCES
Confirm suitability with the current manufacturer TDS before specifying or applying.
316 SS deformed bar + Hilti HIT-RE 500 V4 ETA-approved epoxy
ETA-approved epoxy-bonded stainless deformed bar crack stitching — Hilti HIT-RE 500 V4 — masonry — AS 3700
System Description
316 SS deformed reinforcing bar bonded with Hilti HIT-RE 500 V4 — a premium two-part epoxy acrylate with European Technical Assessment (ETA) approval and full published design resistance tables for masonry and concrete substrates. Preferred for crack stitching where the structural engineer requires documented anchor design values for certification. ETA option 7 rated — suitable for cracked concrete and masonry anchoring. Deformed bar profile enhances mechanical interlock within the epoxy column — higher bond than smooth bar for the same epoxy volume. Damp and underwater installation capability — expanded application window compared to standard epoxy. Hilti HIT-RE 500 V4 requires Hilti manual or battery dispenser — not compatible with standard caulk gun for larger cartridges. Full cure 24–48 hours at 20°C. Hilti technical representative support available for specification and installation review. Confirm current ETA approval number with Hilti Australia before using for certification purposes.
Technical Properties
- Hilti HIT-RE 500 V4 has European Technical Assessment (ETA) — full design resistance tables for masonry substrates
- Preferred by structural engineers requiring documented anchor design values for project certification
- Deformed bar profile enhances mechanical interlock within epoxy column — higher bond than smooth bar
Limitations
- Structural work — engineer mandatory for all crack stitching installations
- Hilti HIT-RE 500 V4 is higher cost than general-purpose epoxy — justify by ETA certification requirement
- Deformed 316 SS bar may have longer lead time than standard threaded rod — confirm availability before specifying
PROCUREMENT SOURCES
Confirm suitability with the current manufacturer TDS before specifying or applying.
316 SS smooth bar + Fischer FIS V 360 S vinylester injection mortar
Vinylester-bonded stainless smooth bar crack stitching — Fischer FIS V 360 S — solid masonry — AS 3700
System Description
316 SS smooth bar bonded with Fischer FIS V 360 S vinylester injection mortar. A medium-strength option positioned between cementitious grout systems and full epoxy — vinylester provides good bond to masonry and concrete at lower cost than full epoxy, with improved moisture tolerance. Used for moderate-load crack stitching applications where the engineer determines full epoxy capacity is not required, or in heritage and soft masonry where the lower stiffness of vinylester reduces stress concentration compared to rigid epoxy. Fischer FIS V products widely available through Fischer Australia national distribution. Lower stiffness than pure epoxy — reduces the risk of stress concentration at the bar termination in soft or heritage masonry. Full cure approximately 60 minutes at 20°C — faster than epoxy. Pot life approximately 10 minutes at 20°C — shorter at high ambient temperatures; check pot life carefully in hot weather. 316 SS smooth bar has lower interlock with resin than threaded or deformed bar — longer anchorage length required to achieve the same pull-out capacity.
Technical Properties
- Vinylester cost lower than full epoxy — economical for moderate-load crack stitching applications
- Moisture tolerant — Fischer FIS V 360 S can be injected into damp bore holes within product tolerance
- Lower stiffness than pure epoxy — reduces stress concentration in soft or heritage masonry at bar termination
Limitations
- Structural work — engineer mandatory for all crack stitching; vinylester load capacity must be confirmed as sufficient for the design load
- Lower load capacity than pure epoxy — not suitable for high-load stitching where full epoxy system is required
- Vinylester fumes during cure — higher VOC than epoxy; adequate ventilation and PPE required during installation
PROCUREMENT SOURCES
Confirm suitability with the current manufacturer TDS before specifying or applying.
System Comparison
Side-by-side comparison of stainless rod epoxy-grouted crack stitching systems. Engineer specification mandatory for all installations. Confirm product selections against current manufacturer TDS before specifying.
| Product system | Brand | Rod type | Resin | Capacity | Damp bore | ETA approved | Cost | Primary use |
|---|---|---|---|---|---|---|---|---|
| 316 M10 + Sika AnchorFix-3+ | Sika Australia | Threaded rod | Epoxy | High | Yes | No (MPII class) | $$ | High-capacity crack stitching — residential and commercial facades |
| 316 deformed + Hilti HIT-RE 500 V4 | Hilti Australia | Deformed bar | Epoxy acrylate | High | Yes | Yes | $$$ | Engineer certification required — ETA design tables for masonry |
| 316 smooth + Fischer FIS V 360 S | Fischer Fixings | Smooth bar | Vinylester | Medium | Good | Yes | $ | Moderate load — heritage masonry or where full epoxy capacity not required |
Critical notes for stainless rod epoxy grouted crack stitching:
- STRUCTURAL WORK — a structural engineer must identify the crack cause, confirm that epoxy rod stitching is appropriate and specify the rod diameter, length, spacing, drill channel depth and epoxy grout system; do not commence without a structural specification
- The crack cause must be identified and eliminated before stitching — epoxy rod stitching of an active crack will result in new cracking adjacent to the stitched zone; confirm that the crack is stable before commencing
- All rods must be grade 316 stainless steel — do not use 304 stainless, carbon steel or galvanised rod; the epoxy capsule fully encapsulates the rod but any exposed rod end must still be corrosion resistant
- Drill channels must be blown clean with compressed air and vacuumed before epoxy injection — dust and debris on the channel walls prevents epoxy bond to the masonry; bond failure means the rod can be pulled from the channel
- Epoxy grout must fully encapsulate the rod for its full length — inject from the back of the hole outward; voids at the rod-to-epoxy interface are a corrosion initiation point and a bond failure point
- Observe the epoxy cure time before loading the repair — premature loading before full epoxy cure reduces the bond strength and can cause the rod to move in the channel; confirm the cure time at the ambient temperature with the product data sheet
Disclaimer
This page provides general technical information only. Stainless rod epoxy grouted crack stitching is structural work — rod specification, channel geometry, epoxy selection and installation must be specified and certified by a structural engineer against project-specific crack cause, load conditions and masonry type per AS 3700.