No digging. No waiting. Just place & build.
Build Foundations Without Digging or Concrete
Meet TuffBlock - the lightweight foundation system for decks, sheds, patios, and backyard builds. Designed for easier, faster decks without digging, special tools or lugging heavy concrete blocks.
✔ 27x lighter than concrete
✔ Supports up to 1,700 lbs per block
✔ Break-tested to 11,000 lbs
✔ No digging. No waiting. No concrete.
Free Shipping. Available online & at Lowe’s nationwide.
Meet TuffBlock - the engineered polymer foundation system designed for easier, faster decks without digging or lugging heavy concrete blocks.
✔ 27x lighter than concrete -
✔ Supports up to 1,700 lbs per block
✔ Break-tested to 11,000 lbs
✔ Made in the USA from 100% recycled materials
Free Shipping. Available online & at Lowe’s nationwide.
Build smarter. Build lighter.
Build with confidence.
ICC Certified
150K+ Real Builds
Rated 4.9/5 stars
25 year warranty
Made in USA
ICC Certified
150K+ Real Builds
Rated 4.9/5
25 year warranty
MADE IN USA
Start Your Build Today
Availlable Online & In-Store at


Availlable Online &
In-Store
How to Install Deck Blocks
in 3 Simple Steps
How to Install Deck Blocks in 3 Simple Steps
Ideal for floating decks, shed foundations, stairs, walkways and low-clearance deck builds.
1Prepare Ground
Prepare the ground for your floating deck by removing loose topsoil or vegetation. Compact the ground with a tamp, and consider using aggregate like crushed rock or paver base.
2Layout Frame
Build the outer frame so it is level and square, then position TuffBlock deck blocks under the joists based on your lumber’s allowable spans to create a strong, stable foundation.
3Install Deck Boards
Finish by installing deck boards over your deck block foundation with spacing for airflow, and complete the outer section using fascia to hide the TuffBlocks for a seamless finish.
✔ Start building the same day
✔ No heavy materials or tools needed
Why Builders Replace Concrete with TuffBlock

CONCRETE BLOCK
✘ Heavy & labour intensive
✘ Can crack or degrade
✘ No warranty
✘ Minimum deck height of 12"–18"
✘ Absorbs water
✘ Often requires cutting & grinding for lumber fit
TUFFBLOCK
✔ Easy to carry & fast to install
✔ UV-stable, corrosion-proof
✔ 25 year warranty
✔ Low deck height of only 6"
✔ Does not absorb water
✔ Fits real world lumber variation for posts, joists & bearers
✔ Faster install. Less labour. Better results
Real-World Foundation Comparison
Based on a 12' × 12' floating deck using ~18 blocks

4.9/5 Rated by 400+ Builders & DIYers
What DIY &
Builders say
Don’t Risk Your Build on Unverified Deck Blocks

TuffBlock
✔ Load rated and tested
✔ Proven with 150K+ real bulds & zero warranty claims
✔ Break tested under high stress
✔ Manufactured using structural-grade polymer
✔ UV-stabilized for outdoor durability
✔ Designed with weight distribution geometry
✔ 25 year warranty
✔ Made in the USA
Unverified Imitators
✘ Unverified overseas imports
✘ Do not publish verified load ratings
✘ Do not provide break testing data
✘ No certification
✘ Use unknown material composition
✘ Offer limited traceability or warranty
Built to Handle Real-World Conditions
Frost heave?
TuffBlocks sit on a compacted gravel base, allowing natural ground movement without cracking like concrete footings.
✔ Used successfully in freeze-thaw climates across North America
Sinking?
The wide base spreads load evenly. Installed on compacted gravel, TuffBlocks create a stable, long-term foundation.
✔ Supports up to 1,700 lbs per block
High Wind?
In high-wind areas, builders often secure structures with earth anchors or combine TuffBlocks with in-ground footings for additional stability.
Code Compliance?
TuffBlocks are ICC-ES certified and used in thousands of residential builds across the U.S.
✔ Always check local building guidelines before starting your project
✔ Built for real-world conditions
✔ Trusted across North America
TuffBlock is Built for Modern
Low-Profile Decks
Today’s homes feature:
• Flush sliding doors
• Minimal step-down transitions
• Tight threshold clearances
Bulky concrete blocks were never designed for these constraints.
TuffBlock allows decks to sit approximately 6 inches above grade, making it ideal for low-profile applications.
Watch real decks, sheds, stairs and more built using deck foundation blocks.
Click on any of the below to see real decks, sheds, stairs and more built using BuildTuff's TuffBlock foundation blocks.
Over 150,000 builds worldwide use TuffBlock foundations.

Engineered smart. Built tougher.
TuffBlock Calculator
How Many TuffBlocks Do You Need?
Enter your deck length and width in feet to estimate required TuffBlocks and recommended pack quantities.
✔ Based on 16" on-center spacing
✔ Designed for ground-level floating decks
✔ 150,000+ real builds
✔ No email required
Or use our deck block spacing chart below to estimate how many TuffBlocks you need based on common deck sizes.
| Deck Length (feet) | Deck Width (feet) | Deck Area Calculator (sq feet) | Estimated TuffBlocks |
|---|---|---|---|
| 8 | 12 | 96 | 24 |
| 20 | 10 | 200 | 42 |
| 20 | 12 | 240 | 42 |
| 30 | 10 | 300 | 60 |
| 20 | 16 | 320 | 56 |
| 35 | 10 | 350 | 72 |
Ready to Ship!
As seen on leading TV networks and building influencers.






Frequently Asked Questions
Contractor & DIY Review
Site Built Sheds (Charlotte, NC)
Jerry from Site Built Sheds uses TuffBlocks on every job because they’re faster, lighter, and more reliable than concrete.
Justin & Jess DIY (Nashville, Tennessee)
“As a first-time DIYer, TuffBlocks were a game-changer. They made the whole deck project simple and straightforward.”
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 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.
- 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.
What others say
How to Build Easy With TuffBlocks
Drop

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.
Level

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.
Build

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.





















