CHB vs. AAC Blocks Philippines — Which Wall Material is Better for Your Build?
Walk through any Philippine construction site and you'll almost certainly see concrete hollow blocks (CHB) — the grey, hollow masonry units that have been the default wall material here for decades. But a growing number of homeowners and developers are asking about AAC blocks (Autoclaved Aerated Concrete) — lighter, better insulating, and gaining ground in premium residential and commercial projects.
Which is the right choice for your project? Here's the honest comparison.
Premium residential projects increasingly specify AAC blocks for superior thermal comfort — critical in the Philippine tropical climate where air conditioning costs are a long-term concern.
What Each Material Is
Concrete Hollow Block (CHB)
CHB is a hollow masonry unit made from Portland cement, sand, and aggregate — cast in a standard mold with hollow cores to reduce weight and cost. Available in 4" (100mm) and 6" (150mm) thicknesses. The dominant wall material in Philippine residential and commercial construction due to low cost and near-universal availability.
Laid with a standard mortar mix (1:3 cement-sand), CHB walls are familiar to every Philippine mason. Interior walls are typically plastered on both faces before painting.
AAC Block (Autoclaved Aerated Concrete)
AAC is manufactured by aerating a slurry of cement, lime, sand, and aluminum powder, then curing it in a pressurized steam chamber (autoclave). The result is a highly uniform, lightweight block with millions of tiny air cells — giving it exceptional thermal insulation, fire resistance, and workability.
AAC blocks are typically 200mm × 200mm × 600mm — about 3–4x the volume of a standard CHB — and are laid with a thin-bed adhesive mortar (3–5mm joints vs. 10–15mm for CHB). They can be cut with a hand saw, drilled, and routed like dense wood.
Head-to-Head Comparison
| Property | CHB (6") | AAC Block (200mm) |
|---|---|---|
| Unit cost (2026) | ₱20–₱28 per block | ₱350–₱550 per block |
| Installed cost per sqm wall | ₱450–₱700 | ₱1,200–₱1,800 |
| Weight per block | ~11–14 kg | ~8–12 kg (30% lighter) |
| Wall weight (per sqm) | ~185 kg/sqm | ~80–100 kg/sqm |
| Thermal insulation (R-value) | Low — ~0.24 RSI | High — ~0.80–1.10 RSI |
| Fire resistance | Good — 2–4 hours | Excellent — 4+ hours |
| Sound insulation (STC) | Moderate — ~40 STC | Better — ~45–50 STC |
| Installation speed | Standard | 20–30% faster per sqm |
| Workability (cutting, routing) | Difficult — requires grinder | Excellent — hand saw or jigsaw |
| Availability in Philippines | Nationwide — every hardware | Metro Manila, Cebu, major cities |
| Skilled labor required | Standard masonry | Thin-bed mortar technique needed |
| Shrinkage cracking risk | Moderate | Lower — more dimensionally stable |
Why Thermal Performance Matters in the Philippines
The Philippines averages 27–35°C year-round with high humidity. A CHB exterior wall absorbs heat throughout the day and radiates it inward through the evening — a phenomenon called thermal mass heat transfer. This is why rooms in CHB houses feel hot even after sunset.
AAC's air-cell structure provides roughly 4x the thermal resistance of CHB. In practical terms: AAC wall interiors stay meaningfully cooler during the day, reducing air conditioning load — and long-term energy bills. For a home occupied for 20+ years, the energy savings can justify the material cost premium.
Structural Implications
In a reinforced concrete frame building (the Philippine standard), walls are non-structural — they fill between columns and beams. In this context, AAC's lower weight is a genuine structural benefit: lighter walls reduce the total seismic weight of the building, which reduces the design seismic force, which can allow smaller structural members or foundations.
For a 150 sqm two-storey house, switching from 6" CHB to AAC exterior walls can reduce the wall mass by 15,000–20,000 kg — a meaningful load reduction that your structural engineer will appreciate.
On most Philippine construction sites, CHB remains the wall material of choice — cost-effective, available, and familiar to local masons. The right choice depends on your project's priorities.
When to Use Each
Choose CHB When
Budget is tight · Project is in a remote location · Local masons are not trained in AAC thin-bed technique · Interior walls and partitions where thermal performance doesn't matter · Perimeter fences and retaining walls
Choose AAC When
Thermal comfort is a priority · Building in Metro Manila, Cebu, or urban areas with good supply · Hotel, resort, or premium residential · Reducing air conditioning costs matters · Fire-rated walls required · Faster construction schedule needed
2026 Material Prices — Philippines
| Material | Unit | 2026 Price Range |
|---|---|---|
| CHB 4" (100mm) | per piece | ₱18–₱24 |
| CHB 6" (150mm) | per piece | ₱22–₱30 |
| AAC Block 200mm × 200mm × 600mm | per piece | ₱350–₱550 |
| CHB mortar (cement + sand labor) | per sqm wall | ₱180–₱280 |
| AAC thin-bed adhesive mortar | per sqm wall | ₱120–₱200 |
| CHB plastering (both faces) | per sqm wall | ₱200–₱350 |
| AAC skim coat / finish | per sqm wall | ₱150–₱250 |
For most standard residential projects in the Philippines, CHB remains the practical and economical choice. For premium homes, hotels, resorts, and buildings where long-term thermal comfort and energy savings are priorities — and where proper AAC installation can be ensured — AAC is a superior material that justifies its premium. A hybrid approach (AAC for exterior walls, CHB for interior partitions) often gives the best balance of performance and cost.
Estimate Your Wall Material Costs
The Unit Cost Analysis app by AEDO computes masonry costs per sqm — CHB and AAC — with editable material prices, labor rates, and productivity factors based on current Philippine market rates. Know your numbers before you commit to a material specification.
Let AEDO Specify the Right Materials for Your Project
Material selection is one of the most impactful decisions in your build — affecting cost, comfort, durability, and long-term maintenance. AEDO's design-build team specifies materials based on your budget, location, climate exposure, and building use — not just what's easiest to source.
- Full material specification as part of architectural design
- BOQ with current market pricing — no surprises
- Procurement support for AAC and specialty materials
- Quality control on material delivery and installation
- Free initial project consultation