Build Faster Deck Foundations
- Without Digging or Concrete

A lightweight, above-ground foundation system that replaces traditional concrete deck blocks - faster to install, easier to handle, and ideal for both standard and height restricted builds.

Build Faster Deck Foundations
- Without Digging or Concrete

A lightweight, above-ground foundation system that replaces traditional concrete deck blocks - faster to install, easier to handle, and ideal for both standard and height restricted builds.

Australia's Favourite

The Original Trusted Foundation Bock

ICC Certified & Builder Ready

150K+ Real Builds

Rated 4.9/5 stars by DIYers & contractors

25 year warranty guarantee 

Trusted by Aussie Builders & DIYers

TuffBlock (12-pack)
TuffBlock (12-pack)
TuffBlock (12-pack)
TuffBlock (12-pack)
TuffBlock (12-pack)
TuffBlock (12-pack)
TuffBlock (12-pack)
TuffBlock (12-pack)
TuffBlock (12-pack)
TuffBlock (12-pack)
TuffBlock (12-pack)
TuffBlock (12-pack)
TuffBlock (12-pack)
TuffBlock (12-pack)

TuffBlock (12-pack)

Regular price $210.00 Free Shipping. Made In Australia.
/
Tax included.

371 in stock

TuffBlock is a lightweight, high-strength alternative to concrete deck blocks, engineered to support over 770 kg per block and break-tested to 5,000kg.

It fits standard timber sizes including 90-100mm for posts & 35-41mm or 41-47mm for joists.

TuffBlocks install on almost any surface and are Australian made from recycled materials.

Free Shipping Australia-wide. 

PLEASE NOTE: These are only sold in quantities of 12.

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Versatile

can also be used as an intermediary solution when used in combination with traditional in-ground concrete methods.

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Weather & UV resistant

Won’t crack or absorb water & UV-stabilised to withstand harsh conditions

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Installs on almost
any surface

Works on soil, gravel, turf, or pavers. 

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Builds decks as low as 150mm

great for areas you can't dig including on top of tree roots & electrical. 

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Explained in 90 Seconds

ICC Certification: 2021 & 2018 International Building Code (IBC) 2021 & 2018 International Residential Code (IRC)

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TuffBlock - Another BuildTuff System

Engineered smart. Built tougher.

Simple Foundation Steps

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Prepare Ground

Prepare the ground by removing any loose top soil or vegetation. Compact the ground with a tamp, and consider using aggregate like crushed rock or paver base.

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Layout Frame

Build the outer frame to get level and square. Then fill in the cross joists with TuffBlocks spaced in accordance with the allowable spans for your lumber.

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Install Deck Boards

Finish off by installing deck boards with spacing for airflow, and complete the outer section using fascia to hide the TuffBlocks for a seamless finish.

Why Builders Replace Concrete with TuffBlock

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TuffBlock

✔ 27× lighter & supports 770+ kgs per block
✔ UV-stable, corrosion-proof
✔ 25 year warranty
✔ Low deck height of 150mm
✔ Does not absorb water
✔ Accepts posts, joists & bearers
✔ Stackable & easy to transport

Concrete Block

✘ Heavy & labour intensive
✘ Can crack or degrade
✘ No warranty
✘ Minimum deck height of 300-460mm
✘ Absorbs water
✘ Often requires cutting & grinding for lumber fit
✘ Bulky & difficult to transport

Trusted by Pros, Built for DIY

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Watch Real Projects Built on TuffBlocks

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As seen on:

Deck Block, Instant foundation system, BuildTuff, TuffBlock, Concrete Deck Block, Builder, Renovation, DIY, Do It Yourself, Build A Deck, Decking, Deck Footing, Instant Foundation System
Deck Block, Instant foundation system, BuildTuff, TuffBlock, Concrete Deck Block, Builder, Renovation, DIY, Do It Yourself, Build A Deck, Decking, Deck Footing, Instant Foundation System
Deck Block, Instant foundation system, BuildTuff, TuffBlock, Concrete Deck Block, Builder, Renovation, DIY, Do It Yourself, Build A Deck, Decking, Deck Footing, Instant Foundation System
Deck Block, Instant foundation system, BuildTuff, TuffBlock, Concrete Deck Block, Builder, Renovation, DIY, Do It Yourself, Build A Deck, Decking, Deck Footing, Instant Foundation System
Deck Block, Instant foundation system, BuildTuff, TuffBlock, Concrete Deck Block, Builder, Renovation, DIY, Do It Yourself, Build A Deck, Decking, Deck Footing, Instant Foundation System
Deck Block, Instant foundation system, BuildTuff, TuffBlock, Concrete Deck Block, Builder, Renovation, DIY, Do It Yourself, Build A Deck, Decking, Deck Footing, Instant Foundation System

Built for the Jobsite 

Forget hauling heavy blocks or waiting days for concrete to cure.
With TuffBlock, you can:

Cut install times in half — crews can frame the same day.
Keep overheads low — reduce transport costs and back-breaking labor.
Work anywhere — on uneven soil, turf, or pavers with a little leveling.
Deliver lasting builds — backed by a rock-solid 25-year warranty.

  • Cut install times in half — crews can frame the same day.
  • Keep overhead low — reduce transport costs and back-breaking labor.
  • Work anywhere — on uneven soil, turf, or pavers with a little leveling.
  • Deliver lasting builds — backed by a rock-solid 25-year warranty.

FREQUENTLY ASKED QUESTIONS

Prefer to buy in store? Visit

BuildTuff Tuffblock decking blocks at Bunnings

How to Build Easy With TuffBlocks

1

Drop

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Place your TuffBlocks directly onto firm, level ground — grass, dirt, gravel, or even concrete. No need to dig holes or pour footings. Just space them where your posts or joists will go.

2

Level

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Use a spirit level to make minor ground adjustments if needed. TuffBlocks work best on flat, stable surfaces — and minimal prep is all it takes. Tip: Use packers such as crusher dust underneath for extra stability and longevity.

3

Build

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Drop in your 3.5" or 4" posts or 1½" - 2" Joists & Bearers — From here, just start building your deck, shed base, stairs, or even tiny home floor.

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✔️ No curing time. No mess. Build immediately.

Shop Now
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Built To last

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We stand behind every TuffBlock with a rock-solid 25-Year Warranty. 

Australia Wide Shipping

We deliver across Australia with Free Shipping.

Our Guarantee

We're so confident in our products and service, we offer a 25 year warranty on your TuffBlocks

Support

We're building a smarter building community. Contact Us anytime, we would love to help!