1200mm Round Flange Ground Screw
£28.99
In stock & dispatched next working day
Length
1200mm
Diameter
76mm
Flange Size
160mm
Material
Galvanised Steel
Wall Thickness
2.0mm
Thread
M16
No digging
No concrete
Build immediately
Most decking and shed projects require 4–9 screws
Not sure how many ground screws you need for your project? Try our ground screw calculator for guidance.
🚚 2–3 Day UK Delivery – calculated at checkout
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Heavy-Duty Galvanised Steel Foundation For Structural Garden & Modular Builds
The 1200mm round flange ground screw is designed for heavier garden structures, insulated garden rooms, log cabins and modular buildings where greater depth and stability are required.
Its extended length provides improved anchoring performance in softer or variable UK soil conditions, making it a dependable no-dig alternative to traditional concrete foundations.
Install. Bolt down. Build immediately.
No excavation.
No curing time.
No delays.
Why Choose The 1200mm Ground Screw?
Greater Stability In Softer Ground
The increased embedment depth improves resistance to uplift and movement in clay, mixed and softer soils.Designed For Heavier Structures
Suitable for log cabins, insulated garden rooms and structural timber frames.No Concrete Required
Eliminates excavation, spoil removal and curing time.High Load Performance
Capable of supporting significant vertical loads when correctly spaced and installed.Corrosion-Resistant Galvanised Steel
Hot-dip galvanised finish protects against long-term moisture exposure.Removable & Reusable
Can be unscrewed and relocated if your structure changes.
Ideal Applications
Log cabins
Insulated garden rooms
Summerhouses and playhouses
Modular and portable buildings
Raised decking with higher load demand
Steel or timber framed structures
Ground-mounted solar frames
Projects on softer or less compacted soil
For very large or commercial structures, consider on-site load testing.
Technical Specifications
Designed for bolt-down connections to timber joists or steel brackets via integrated flange plate.
Length
1200mm
Diameter
76mm
Flange Size
160mm
Material
Galvanised Steel
Wall Thickness
2.0mm
Thread
M16
Load Capacity & Ground Conditions
Ground screws achieve their strength from interaction with surrounding soil.
Actual safe working load varies depending on:
- Soil composition
- Installation depth
- Ground moisture
- Load distribution across multiple screws
The stated 730kg capacity is indicative and soil dependent.
For:
- Engineer-specified projects
- Commercial installations
- High wind exposure areas
- Larger insulated garden rooms
We recommend on-site pull testing to provide calibrated safe working loads for compression, uplift and lateral forces specific to your site.
Installation Guidance
- Can be installed manually for small layouts
- Machine installation recommended for multi-screw or structural builds
- Suitable for most UK soil types
- Not suitable for solid rock without pilot drilling
- Always check for underground utilities before installation
Why Choose 1200mm Over 900mm?
Choose 1200mm if:
Your structure exceeds 2.5m depth or width
You are installing a fully insulated garden room
Your ground is softer or variable
You require improved uplift resistance
Your build is long-term or permanent
The additional depth provides greater anchoring confidence where load demand is higher.
Not Sure Which Size You Need?
The correct screw length depends on:
Structure size
Load weight
Ground conditions
Spacing layout
Use our Ground Screw Calculator to estimate quantity and layout before ordering.