Pods & Void Formers
Polystyrene void former pods and pod spacer accessories for waffle and raft slab construction.
Void former pods create a void beneath a slab on reactive soil sites, relieving ground pressure while the slab keeps its structural support. Our range covers polystyrene void former pods from 150mm to 375mm, plus the pod spacers used to position and support them correctly during the pour. Pods & Void Formers is a quote-request category — pricing depends on quantity and site requirements, so request a quote and we'll respond with an accurate price.
Choosing Void Former Pods
Void former (riser) pods are different from the waffle pods used across an entire waffle slab \xe2\x80\x94 they're typically specified for isolated void areas within a slab, for example where extra clearance is needed over reactive soil or around a specific structural element. Our range covers polystyrene void formers from 150mm through to 300mm, with pod spacers available separately for the 100\xe2\x80\x93300mm range.
Exactly which size and how many you need comes down to your site's engineering design, not a general rule of thumb \xe2\x80\x94 that's also why this category is quote-request only rather than fixed online pricing. If you're not yet at the point of a finalised design, our House Slabs, Waffle Slabs and Raft Slabs pages (and the Waffle Slab Calculator) are a good starting point for working out which slab type suits your site before void formers come into the specification.
Further reading: Waffle Pod Systems Explained: How They Work.
Frequently Asked Questions
What sizes of void former pods do you stock?
Our range covers polystyrene void former pods from 150mm through to 300mm, plus pod spacers for the 100–300mm range.
What's the difference between a waffle pod and a void former pod?
Waffle pods form the ribbed void grid across an entire waffle slab; void former (riser) pods like these are typically used for isolated void areas — for example where a slab needs extra clearance over reactive soil or around specific structural elements. Your engineer's design will specify exactly what's needed for your site.
Are pod spacers sold separately from the pods?
Yes — pod spacers are stocked as a separate item alongside the void former pods themselves.
Why is this category quote-request only?
Void former quantities and sizing are driven by your specific engineering design, so we price this range per request rather than a fixed online rate.
Do void formers apply to both waffle slabs and raft slabs?
Void formers are most commonly specified for waffle slab construction, though some raft slab designs call for them in specific areas — see our House Slabs, Waffle Slabs and Raft Slabs pages, or use the Waffle Slab Calculator, for more on which slab type suits your site.
Related Services & Calculators
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Request a free, no-obligation quote and our team will assess your site and provide an accurate, fixed price.