Waffle Slab Moulds | Formwork Types & Prices

Direct manufacturer — Alborz Ghaleb Industrial Complex, Karaj, Iran

Imagine a building that is lighter, more earthquake-resistant and dramatically cheaper in materials. That is exactly what waffle slab moulds deliver. This technology — the beating heart of beautiful coffered ceilings — is reshaping modern construction.

A waffle slab mould is a reusable polypropylene (or steel) form used to cast waffle slabs: by removing inefficient concrete from the slab soffit it cuts structure weight by up to 30%, while the grid of orthogonal ribs keeps full strength. Unlike permanent void formers (U-Boot), waffle moulds strip after curing and are reused 50+ times — an economical and eco-friendly choice.

💡 Successful waffle slab execution needs proper shoring: get system scaffolding and prop jacks from the same source.

Waffle slab moulds for sale manufactured by Alborz Ghaleb

Chat on WhatsApp Factory line: +98 912 139 0683

Why Engineers Choose Waffle Slabs (Honest Pros & Cons)

Key advantages

Lighter, safer structure: up to 30% less slab weight — lower dead load, better seismic performance;
Cost savings: less concrete and rebar + 50+ reuses = much lower final cost;
Architectural freedom: spans up to 16 m without intermediate columns;
Fast cycle: quick placing and stripping shortens the schedule;
Exposed beauty: the coffered soffit looks modern — no false ceiling needed;
Featherweight forms: each mould weighs only 3–8 kg — handled without heavy equipment;
High pressure resistance despite the low weight; polished face strips clean without special oiling;
19 sizes from 60×60 up to 95×95 cm for every project type.

Honest drawbacks

Higher initial cost — recovered quickly through reuse on larger jobs;
Skilled crew required for safe, correct execution;
Limits on irregular plans: highly curved or special-load structures can be challenging.

Types of Waffle Slab Moulds

One-way waffle: the economical choice for short spans

Used when loading runs mainly in one direction; acts like cast-in-place joists, ideal for 6–9 m spans. Lower initial cost, faster execution, simpler design — perfect for regular residential plans.

Two-way waffle: power and flexibility for big projects

Designed for loads in two orthogonal directions; enables 10–16 m spans with more uniform load distribution. The top pick for sports halls, multi-storey car parks and commercial spaces.

Skydome & hybrid systems

Combining waffle moulds with post-tensioning pushes spans to 20 m. Skydome moulds with a domed profile and 20 cm heel offer better acoustic insulation and a striking soffit — used in metro stations, exhibition halls and large warehouses.

Feature	One-way waffle	Two-way waffle
Shape	Rectangular	Square
Rib direction	One direction	Two orthogonal directions
Max span	up to 9 m	up to 16 m (special design)
Main use	corridors, short spans	halls, car parks, long spans
Cost	usually cheaper	slightly higher, better on long spans

19 Sizes: from 60×60 to 95×95 cm

Waffle slab mould 60x60x18 cm by Alborz Ghaleb

Waffle slab mould 75x75x28 cm by Alborz Ghaleb

Waffle slab mould 80x80x30 cm by Alborz Ghaleb

Mould size (cm)	Max span	Recommended use
60×60×18	up to 7 m	small residential & commercial
60×60×25 / 28 / 30	8–9 m	commercial, car parks, small halls
75×75×18 / 24 / 28 / 30	8–10 m	commercial, car parks, halls
80×80×25 / 28 / 30 / 40	10–12 m	industrial, warehouses, car parks
85×85×25, 90×90×30 / 33 / 40	13–15 m	industrial, warehouses, bridges
Skydome 90×90×30 / 40 (heel 20)	14–16 m	metro, exhibition, big warehouses
95×95×40	up to 16 m	large industrial, bridges

Waffle vs U-Boot, Block-Joist and Cobiax

vs U-Boot: waffle is lighter (forms strip out, not buried) and far cheaper long-term thanks to reuse; execution is simpler — U-Boot formers tend to float during the pour;
vs block-joist: waffle is much lighter; block-joist wins only on very short spans — as spans grow, waffle saves steel and concrete; waffle also looks better and performs better seismically;
vs Cobiax: both are light, but waffle's orthogonal ribs give more design flexibility, and reusable moulds win economically on large jobs.

System	Weight	Cost	Soffit	Key edge
Waffle	light	cheapest long-term	coffered, beautiful	reusability + long spans
U-Boot	medium	lower initial	flat	two-way flat slab
Block-joist	heavier	cheap on short spans	flat (needs finishing)	simple small jobs
Cobiax	light	lower initial, no reuse	flat	two-way voided slab

Step-by-Step Waffle Slab Execution

1) Design: detailed drawings by the structural engineer for loads and spans;
2) Shoring: modular scaffolding and prop jacks installed and levelled — the foundation of the whole job;
3) Mould layout: waffle moulds placed and levelled exactly to drawing;
4) Reinforcement: rebar fixed between and over the moulds;
5) Concreting: uniform pour with proper slump, fully vibrated;
6) Stripping: after initial set (7–14 days), moulds strip gently, get cleaned and stored for the next slab.

Common mistakes to avoid

Weak shoring: substandard jacks or scaffolding can cause slab settlement during the pour;
Early stripping: leads to cracking or excessive deflection;
Insufficient vibration: creates honeycombing in the ribs and weakens the slab.

Waffle slab execution on modular scaffolding and prop jack shoring

Waffle Mould Prices and Quantity Calculation

Waffle slab mould prices depend on material (virgin PP or steel), size and depth, type (one-way/two-way/Skydome) and the raw-material market. Bigger, deeper moulds (95×95×40) cost more than small ones (60×60×18); one-way moulds are usually cheaper than two-way. Prices move daily — ask for today's list:

Mould type	Sizes	Daily price
Two-way PP waffle	60×60 … 95×95 (depth 18–40)	Instant quote
One-way modular lock-type	60×25 + custom	Instant quote
Skydome heel-20	90×90×30 / 40	Instant quote
Rental	all sizes — monthly	Ask terms

📐 Quick estimate: take ~70% of the total slab area (excluding columns and openings) and divide by one mould's area. Example: 300 m² slab with 80×80 moulds (0.64 m²): 300 × 0.7 ÷ 0.64 ≈ 328 moulds. Our engineers calculate exact counts from your drawing for free.

Buy or rent? New or used?

Rent for short, small jobs — pay only for the months you need;
Buy if you build continuously — after a few projects the moulds work for free;
Used moulds are economical if sound: check for cracks, warping and edge damage. Browse verified listings on our used marketplace.

Factory-Direct Supply and Export

Alborz Ghaleb moulds waffle forms from compressed polypropylene on advanced injection machines in Karaj; every batch is pressure-tested. Selling is factory-direct with no middlemen: real factory pricing, free engineering consultation (send your slab drawing — we pick the type, size and exact count), official proforma, factory visits by appointment, rental and verified used options, plus complete shoring supply — scaffolding, prop jacks and formwork accessories from one source. We ship across Iran and export to Iraq, Turkey, Armenia, Russia and CIS with official documents.

Waffle slab mould 80x80x25 cm production at Alborz Ghaleb factory

Waffle Slab Moulds — FAQ

How much do waffle slab moulds cost?

Price depends on size, depth, type (one-way/two-way/Skydome) and the polymer market; one-way is usually cheaper. WhatsApp +98 912 139 0683 for today's list and a same-day proforma.

How many times can a mould be reused?

Quality polypropylene moulds last 50+ uses with proper care — this reusability makes waffle far cheaper than single-use systems like U-Boot.

Is a waffle slab earthquake-resistant?

Yes — up to 30% less dead load and the high rigidity of the two-way ribbed plate give excellent seismic performance and lighter foundations.

One-way vs two-way — what's the difference?

One-way carries load in a single direction (spans up to ~9 m); two-way carries load in two orthogonal directions (spans up to 16 m, square plans).

How do I calculate the number of moulds?

Quick method: ~70% of slab area ÷ one mould's area (80×80 = 0.64 m²). For exact numbers consult your engineer — we also calculate from drawings for free.

Should I buy or rent?

Rent for one short project; buy if you build continuously — the purchase pays back within a few jobs. Both options are available from us.

Plastic or steel moulds?

Polypropylene is the market favourite: 3–8 kg weight, easy handling, lower price, no concrete adhesion. Steel is stronger but heavier and costlier — for special projects.

Do you export waffle moulds?

Yes — to Iraq, Turkey, Armenia, Russia, Afghanistan and CIS countries with official export documents, loaded at our central Karaj warehouse.

Build Your Next Waffle Slab with Alborz Ghaleb

Send your slab drawing — our engineers select the right mould type and size, calculate the exact count and return an official proforma. Factory-direct production + rental + verified used + complete shoring supply.

Send drawing on WhatsApp +98 912 139 0683

Waffle Slab Moulds: Types, Prices and Factory-Direct Supply