The reference data behind a tender price: consumption standards, material data and the rate build-up.
bags / m³ · two published references
bags / m³
M-15
M-20
M-25
M-30
The standard references disagree grade by grade. Which one your estimator starts from changes what you buy.
per BOQ line
Material
take-off quantity × current supplier rate, per material behind the line
Wastage
allowance on the material, set per trade
Labour
crew cost against the output norm for the item
Plant
equipment time the item consumes
Overheads & margin
prelims, running cost and the number you defend
400 × 200 × 200 mm · Dubai spec
| Property | Hollow | Thermal (insulated) |
|---|---|---|
| Weight | ~22.5 kg | ~23.6 kg |
| Density | ~1,320 kg/m³ | two leaves + core |
| Mean compressive strength | ~7.5 N/mm² | spec-dependent |
| Insulation core | none (two cavities) | 60 mm polystyrene |
| U-value | uninsulated | ~0.48 W/m²·K |
| Thermal conductivity | n/a | ~0.11 W/m·K |
The premium buys the core: on an envelope wall the insulated block usually wins once the cooling load is priced.