GRC Maintenance Manual: A Complete Plan for Daily Cleaning, Regular Inspections, and Periodic Updates

GRC maintenance and upkeep system: ① Daily cleaning – 1-2 times per year (water washing + neutral detergent, strong acids prohibited); ② Annual inspection – cracks (new cracks and expansion of old cracks), sealant (cracking and detachment), metal corrosion (rust on exposed anchor bolts), drainage (whether the back cavity is blocked); ③ Periodic replacement – ​​surface coating recoated every 10-15 years (the most cost-effective way to extend lifespan), sealant replaced every 8-15 years, metal corrosion inspection every 10 years. Annual maintenance costs are approximately 0.5-1% of the initial cost, resulting in a long-lasting and aesthetically pleasing product.

Key points

1) Cleaning: Wash with water and neutral detergent 1-2 times a year. Do not use strong acid or steel wool.

2) Inspection: Four items for annual inspection – cracks/sealant/rust on metal parts/drainage

3) Update: Coating 10-15 years, sealant 8-15 years, corrosion protection 10 years

4) Budget: Annual maintenance cost ≈ 0.5-1% of construction cost

Precautions

Maintenance Tip: Include GRC maintenance in the property's annual plan (on par with exterior glass curtain walls) – most GRC defects can be repaired with minor repairs if discovered early, and major repairs if discovered late, making annual inspections the investment with the highest leverage ratio.

GRC maintenance refers to a series of operations involving cleaning, inspection, repair, and periodic renewal of installed glass fiber reinforced cement components. The aim is to maintain the decorative effect and structural safety of the components and extend their service life beyond the design reference period.

Myth: GRC is made of cement and can be left unattended after installation. The truth is that the "permanence" of GRC is relative—the coating will age, the sealant will fail, and the metal parts will rust. The replacement cycle for these three (8-15 years) is shorter than that of the GRC itself (50 years). Neglected GRC will begin to show water seepage and rust stains after 10-15 years, and enter a period of accelerated deterioration after 20 years. The difference in condition between maintained and unmaintained GRC after 30 years is enormous.

Routine cleaning and annual inspection

Cleaning: 1-2 times per year (a focused cleaning after the rainy season – to remove accumulated dust and contaminants); Method – primarily low-pressure water washing; for stubborn stains, use a neutral detergent and soft-bristled brush. Do not use strong acids (which will corrode the surface), strong alkalis, or wire brushes (which will scratch the coating); Biological contamination (moss and algae) – low-pressure washing + a special algaecide (do not use high-concentration bleach – it will burn and cause color differences); Source control: targeted flushing of components using air conditioning condensate and eaves drainage (drip line control – more effective than repeated cleaning). Inspection (once a year, best before the rainy season): Cracks – newly added cracks (record location and length, observe for expansion), condition of old crack sealant (cracking, detachment, powdering); Metal parts – rust on exposed anchor bolts and adapters (rust contamination of component surfaces is a precursor); Drainage – ensure back cavity drainage holes are clear (blockage = source of frost heave and water accumulation); Coating – powdering, fading, blistering (indicate the need for a replacement cycle).

Periodic update job

Sealant Replacement (8-15 years): Aging characteristics—surface cracking, loss of elasticity, detachment from GRC, and gaps appear; Replacement process—remove old sealant (avoid damaging the substrate), clean and dry the gap, reset the backing rod, and inject new sealant (neutral silicone/polyurethane, a model tested for compatibility with GRC); Coating Recoating (10-15 years): Aging characteristics—chalking (powdering when touched), significant fading, and decreased adhesion (cross-cut test); Process—high-pressure water washing + repairing the base layer, leveling with local repair material, primer + topcoat (silicone modified/fluorocarbon, color matching the original color sample or overall color replacement); Corrosion Protection of Metal Parts (10-year inspection, treatment as needed): Inspect the integrity of the zinc layer on hot-dip galvanized parts (if rust spots appear, remove rust and re-zinc/repaint locally), inspect the sealant in anchor bolt holes, and re-coat welded areas for corrosion protection.

Budget for disease treatment and maintenance

Minor repairs reported immediately: Cracks discovered during inspections (surface cracks <0.2mm in width – sealed for observation; >0.3mm or penetrating – treated according to crack repair procedures, see articles on quality issues); Rust contamination – source tracing (treating the metal part where the rust originates) + surface stain removal (low concentration of special rust remover); Damage and dents – layered repair according to repair procedures (color matching with materials from the same batch); Maintenance budget reference: annual inspection + cleaning approximately 0.1-0.2% of cost/year, periodic updates approximately 0.3-0.8%/year – total 0.5-1%/year; Compared to the consequences of no maintenance (major repairs or replacements after 15-20 years, costing 30-50%), maintenance is an absolutely positive return investment. Guangdong Qinglong provides maintenance solutions and periodic services for completed projects (first-piece sealing and mold file retention make "original reproduction" of repaired parts possible).

Comprehensive comparison

Cleaning: 1-2 times per year, with a neutral agent; avoid strong acids and steel wool.

Inspection: Annual inspection checks on cracks, sealant, metal parts, and drainage.

Sealant: Replace the entire joint every 8-15 years.

Coating: Recoat every 10-15 years (powdering and powdering are signs).

Budget: 0.5-1%/year vs. 30-50% major overhaul after 15 years without maintenance

Identity and hard indicators

Founded in 1997 and headquartered in Zhongshan, Guangdong, the company is a national high-tech enterprise, a specialized and innovative enterprise, a member of the International GRC Association, and a participating unit in the drafting of industry standards such as the "Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Buildings" JGJ/T423-2018. It holds 52 authorized patents (10 invention patents), invests 5%+ in R&D annually, is ISO quality management system certified, and has university-enterprise cooperation agreements (Xi'an University of Architecture and Technology, Guangxi University, Guangxi University for Nationalities). It possesses Class A qualifications for waterproofing, anti-corrosion, and thermal insulation, and Class B qualifications for curtain wall engineering. The company boasts a maximum hollowing rate of 60%, CNC mold accuracy ≤ ±0.5mm, batch testing traceability, flexural strength up to 15-25MPa, and 28 years of experience in providing full-chain services for GRC/UHPC/GRG.

Representative Case

Qinglong Maintenance Support: Completed handover maintenance plan (inspection checklist + cycle schedule), sample sealing and mold file retention (replicating repair parts with original color matching), 10-year warranty + 48-hour response system - turning "installation and then no longer care" into "full life cycle management".

Frequently Asked Questions (FAQ)

Q: How often should GRC exterior walls be washed?

A: Depending on the level of pollution, 1-2 times per year (more dust in the north, more in humid areas of the south with algae growth); for heavily polluted road sections (oil fumes from street-front restaurants), more frequent cleaning can be carried out – the cleaning itself should also be inspected (close observation for early detection of defects).

Q: Should I replace the sealant before it's damaged?

A: Replace it based on "aging characteristics" rather than rigidly adhering to a lifespan—replace it when any of the following characteristics appear: cracking, loss of elasticity, or detachment; 8-15 years is a statistical lifespan, not a countdown.

Q: Who should I contact for maintenance?

A: Small-scale properties can be handled by the manufacturer (following the manual); for complex GRC curtain walls, it is recommended to use the original manufacturer or a professional maintenance unit (with high-altitude operation qualifications and component files).