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The Blocka System

The Blocka System by GroutStoppers is a smarter, reusable alternative to traditional timber boxing for block fill washouts. Designed to eliminate blowouts, reduce waste, and dramatically speed up setup, Blocka helps crew's complete cleaner, more consistent work with less effort.

Now available nationally through Firth, Blocka System gives contractors a faster, more efficient solution for block fill washouts.

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

Suitable for Block Fill, Blocks, Sealing, Grouting

Why Choose Blocka?
Cuts material and labour costs

BLOCKA plates are reusable up to 25 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 sites and less landfill.

Smarter, more sustainable building

Less waste, fewer fixings, no tool use, and faster pours = a more efficient workflow overall.

How to use The Blocka
Here’s your guide to using the BLOCKA System.

Prepare the washout with 1 Blocka Plate and 2 Blocka Ties ready for use, along with the Blocka Cable Tensioner.

Position the plate with the flat side against the masonry wall (ribs facing away from the wall).

Thread each Blocka Tie through the first opening of the Blocka Plate.

Wrap the Blocka Tie around a reinforcing rod.

Thread the Blocka Tie back through the second opening.

Connect the tie ends and pull them tight to secure the plate.

Tension both ties using the Blocka Cable Tensioner until the plate sits firmly against the wall.

Once the concrete has set (min 1 hour), cut the ties, remove the plate, and brush off any residue before storing.

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.