Difference Between Strip and Raft Foundations
Strip foundations are linear under walls; raft foundations spread the load over a large area. Strip suits good ground and moderate loads; rafts suit variable or poor ground. The structural engineer chooses from the ground investigation. This guide explains the difference and when each is specified.
Most teams review difference between strip and raft foundations when live project risk needs turning into a clear technical decision with practical next steps.
review Piling Contractors in Tonbridge and Concrete Foundations in Newcastle.
Situations where this applies
Teams usually investigate difference between strip and raft foundations when early warning signs start affecting reliability, compliance, or project timelines. This is often the point where decision makers move from observation into scoped technical action.
What often triggers action
The symptoms below are the most common triggers we see before diagnosis and repair planning.
- Strip: continuous under walls
- Raft: slab over whole footprint
- Ground conditions drive choice
- Settlement and bearing capacity
- Design from structural engineer
What the work typically involves
The ground investigation and structural design define the type. We deliver strip or raft to the design.
If this matches your project stage, send drawings and site details for a scoped quote — or call to talk through programme and access constraints.
How we approach the fix
We build strip or raft foundations to your engineer's specification with certification.
What drives programme and budget
Cost and complexity usually depend on access constraints, total scope, existing condition, and whether related works need to be coordinated in the same programme window.
What the process looks like
We keep delivery structured so scope, sequencing, and sign-off remain clear.
Step 1: Initial assessment
What this step delivers: Root cause and scope are confirmed.
Step 2: Method planning
What this step delivers: Practical repair strategy is agreed.
Step 3: Delivery and verification
What this step delivers: Work is completed and validated.
How This Issue Is Normally Diagnosed and Repaired
Follow the typical path from problem identification through to resolution:
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Related Services
Piling for new builds, extensions and structural works on difficult or tight sites.
Foundation ContractorsCommercial and residential foundation contractors: strip, raft, pad and piled solutions to engineer's design.
Concrete FoundationsReinforced and mass concrete foundations and ground beams.
Related Topics
Related Groundworks Guides
Difference Between Strip and Raft Foundations FAQ
What are the signs of difference between strip and raft foundations?
Strip: continuous under walls. Raft: slab over whole footprint. Ground conditions drive choice.
How do you diagnose difference between strip and raft foundations?
The ground investigation and structural design define the type. We deliver strip or raft to the design....
How do you fix difference between strip and raft foundations?
We build strip or raft foundations to your engineer's specification with certification....
Need project guidance?
Share your site details and priorities. We will outline a practical scope, likely timeline, and next steps.