0800 Firth 1 (347 841)
Home Bricks & blocks Masonry blocks The Blocka System
Screenshot 2026 02 16 100553

The Blocka System

The Blocka System by GroutStoppers is a reusable alternative to traditional timber boxing for block fill washouts. It reduces reliance on disposable timber, removes the need for cutting and drilling, and helps minimise tool‑related risks on site. Blocka also reduces silica dust exposure by eliminating the need to drill into masonry and helps speed up setup and stripping, supporting safer and more consistent handling during block fill preparation.

Now available nationally through Firth.

To place an order, contact your local Firth Sales Representative or call 0800 FIRTH 1.

Suitable for Block Fill, Blocks, Sealing, Grouting

Product Documents

Blocka (13)
The Blocka System User Guide pdf 1.1 MB

Why Choose Blocka?
Cuts material and labour costs

BLOCKA plates are reusable up to 52 times, reducing spend on timber and consumables.
Each box of 20 plates replaces around 8 I/m of timber boxing.

No tools, no drilling, no batteries

BLOCKA needs no screws, no fixings, and no drill bits, saving time and avoiding on-site hassle.
No charging batteries or carrying extra tools around.

Faster, cleaner set up

Two BLOCKA Ties loop around the reinforcing and pull tight with the cable tensioner.
Builders get a secure seal in a fraction of the time compared to building timber boxing.
Secure & tested to stop blowouts

When installed correctly, BLOCKA prevents porthole leaks and block fill blowouts.
Instructions are simple and repeatable, making quality consistent.

Reduces waste on every job

No more piles of timber offcuts.
Plates can be cleaned and reused, supporting cleaner, less cluttered worksites.

Improves onsite safety

Removing cutting, drilling, and fixings reduces tool‑related injuries and silica dust exposure, helping create safer work conditions.

Blocka Starter Pack

Everything you need to seal masonry inspection portholes quickly, cleanly, and securely in one simple system.

14
16
15

How to use The Blocka
Here’s your guide to using the BLOCKA System.
3
1 (4)
5
6
7
8
9
10

Ready to order or want more information?

The Blocka System is available nationwide. To order, get in touch with your local Firth Representative or call 0800 FIRTH 1 and we’ll connect you with the right person. 

 

Blocka is a registered design and patent of Grout Stoppers
Registered Design 433348 in New Zealand; 202415008 in Australia
Patent 2024132260 registered in Australia
Patent 828533, 828540 applications pending in New Zealand