The 8 inch block is the heavy section: used where the wall has to resist more than it divides — retaining situations, tall perimeter walls and structural walling specified by the engineer.
An 8 inch unit costs more per block and slows the laying rate, so it should be specified deliberately. It earns that cost where the wall retains ground, stands tall and exposed, carries heavier structural load, or needs a wider core for vertical reinforcement and grout.
On coastal Zanzibar sites, exposure is a real factor — a tall boundary wall facing prevailing weather behaves very differently from a sheltered internal wall of the same height.
Where 8 inch blockwork is being reinforced, the bar schedule and the block order need to be agreed together: bar diameter, spacing and lap positions all affect the coursing and the practical build sequence. We supply reinforcement steel alongside blocks, so both can be quoted and scheduled on one order.
Projects rarely order one material alone. These are the categories most often quoted alongside it.
Build Hub manufactures cement blocks in Zanzibar using automated hydraulic moulding and a structured curing process, so units arrive dimensionally consistent and stack, lay and course predictably on site.
View detailsThe 6 inch block is the workhorse of Zanzibar construction: substantial enough for load-bearing and boundary walling, economical enough to run through an entire building without inflating wall thickness or foundation width.
View detailsRebar is supplied against the schedule: diameters, lengths, shapes and quantities as drawn. Build Hub procures reinforcing bar in Zanzibar for slabs, columns, beams, foundations and reinforced blockwork.
View detailsCement is the one material on site with a shelf life, so supply is a scheduling problem as much as a purchasing one. Build Hub supplies cement in Zanzibar coordinated against your pour and blockwork programme.
View detailsRetaining walls must be designed by an engineer. An 8 inch unit is often the practical minimum for reinforced blockwork retaining, but the design — not the block size — governs.
Yes, where the design calls for it. Agree the bar schedule before ordering so coursing and lap positions work with the units.
For most internal and standard external walls, 6 inch is the normal choice. 8 inch is usually reserved for tall boundary walls, retaining situations and specified structural walls.
Upload your BOQ or send us your full material requirement and Build Hub will prepare a consolidated quotation.
Send your quantities, site location and required dates — or attach a BOQ or material schedule — and our team will come back with a written quotation and a delivery plan.
