General Information
Training Name
Wall Plastering — Complete Guide
Release Date
January 15, 2026
Global Productivity Rate
20 m² / worker / day
Incentive Rate
+20% over 25 m²/day
Required Skill
Plasterer (Senior)
SBC Reference
SBC 305 — Chapter 6
Required Tools & Materials
Tools (عدد)
مسطرة ألمنيوم 2م
Aluminum ruler — 1 per 1,000 m²
مالج لياسة (Trowel)
Plastering trowel — 1 per worker
حوض خلط (Hawk)
Mortar hawk — 1 per worker
Equipment (معدات)
خلاطة مونة كهربائية
Electric mortar mixer — 10 m²/day
Materials (مواد)
أسمنت + رمل ناعم (1:3)
1 bag cement per 25 m² wall
شبك دجاج (Wire Mesh)
1 m² mesh per 1 m² wall (corners)
Step-by-Step Instructions
1
Surface Preparation — تحضير السطح
Clean all dust, loose material and oil stains from the wall surface. Apply bonding agent (SBR) if surface is smooth concrete. Wet surface with water before application.
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2
Fix Corner Beads — تثبيت الركنيات
Fix aluminum corner beads on all external corners using mortar. Ensure plumb using spirit level. Allow to set before plastering.
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3
Mortar Mix — خلط المونة
Mix cement:sand at 1:3 ratio. Add water gradually until workable consistency. Do not add water after mix sits for more than 30 minutes.
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4
Apply Scratch Coat — الطبقة الأولى
Apply 8-10mm first coat with firm pressure. Scratch surface with notched tool while still wet to improve bonding for second coat.
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5
Finish Coat — الطبقة النهائية
After scratch coat cures (min. 24 hrs), apply finish coat 5-8mm. Smooth with trowel and aluminum ruler. Check flatness with 2m ruler — max 3mm deviation.
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6
Curing — المعالجة
Keep surface damp for minimum 3 days. Cover with hessian or spray water twice daily. Do not allow surface to dry too fast in hot weather.
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Quality Checklist
Surface cleaned and bonding agent applied
Corner beads plumb (checked with spirit level)
Mortar mix ratio verified: 1 cement : 3 sand
Scratch coat thickness: 8-10mm
Finish coat thickness: 5-8mm (total 15-18mm)
Flatness check: max 3mm deviation per 2m ruler
No cracks or hollow spots (tap test passed)
Curing completed — 3 days minimum
Common Scenarios & How to Handle
⚠️ Mortar sliding off wall
Cause: Surface too smooth or wet. Fix: Let surface dry slightly, reduce water in mix, apply thinner first layer.
🔴 Cracks appearing after drying
Cause: Too much cement or dried too fast. Fix: Mix ratio correction, moist curing immediately, patch hairline cracks with slurry coat.
⚠️ Hollow spots (delamination)
Cause: Poor bonding, contaminated surface. Fix: Hack out hollow area, clean, reapply with bonding agent.
✅ Work in hot weather (above 38°C)
Solution: Work in shade or early morning, pre-wet wall, add retarder to mix (1% of cement weight), cure more frequently.
Common Questions (FAQ)
What is the minimum wall thickness for plastering? ▾
Total plaster thickness should be 15-18mm (scratch 10mm + finish 8mm). Minimum acceptable is 12mm per SBC 305.
Can we plaster over painted surfaces? ▾
Not directly. Paint must be fully removed by sandblasting or grinding. Then apply SBR bonding agent before plastering.
How do we handle block wall joints? ▾
Fill all block joints flush with mortar first. Install wire mesh over block joints before applying scratch coat to prevent cracking.
Sources & References
Request Practical Training
After completing the theory, you can request practical on-site training with a senior technician.