The 4 inch block is a partition unit. Used correctly it saves floor area, material and labour inside a building; used in the wrong place it is the most common cause of avoidable cracking in Zanzibar blockwork.
Internal partitions, non-load-bearing divisions, bathroom and service walls, and fit-out works where the wall divides space rather than carries it. Because it is thinner, each square metre of wall costs less in material and takes less time to lay, and the building gains usable floor area.
What it should not do is carry structural load, form an exposed boundary wall, or take the brunt of wind-driven rain on an external face — those are 6 inch or 8 inch jobs.
Most buildings need both sizes, and it is worth ordering them together. A combined quantity lets us plan production and schedule the deliveries so partitions arrive at the fit-out stage rather than sitting on site absorbing damage during the structural works.
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 detailsThe 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.
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 detailsWe do not recommend it. External and load-bearing walls should use 6 inch or 8 inch units as specified by the design team.
Per square metre of wall they usually are, because there is less material per unit and laying is quicker — but only where a partition unit is the correct choice structurally.
Yes. Combined orders are scheduled together so each size arrives at the stage of works that needs it.
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.
