What DPC detail is needed between foundation and timber frame?

The damp-proof course (DPC) between foundation and timber frame is critical for preventing moisture migration into the structural timber. Requirements: minimum 150 mm clearance between ground level and lowest timber element; continuous DPC membrane (minimum 0.3 mm polyethylene or bituminous felt) on top of foundation wall/sole plate bearing surface; DPC must lap with floor membrane and wall breather membrane to create continuous moisture barrier; sole plate should be pressure-treated timber (use class 2 minimum) even with DPC present; and ventilation must be provided to any subfloor void.

The damp-proof course (DPC) between foundation and timber frame is critical for preventing moisture migration into the structural timber. Requirements: minimum 150 mm clearance between ground level and lowest timber element; continuous DPC membrane (minimum 0.3 mm polyethylene or bituminous felt) on top of foundation wall/sole plate bearing surface; DPC must lap with floor membrane and wall breather membrane to create continuous moisture barrier; sole plate should be pressure-treated timber (use class 2 minimum) even with DPC present; and ventilation must be provided to any subfloor void.

Why this matters

This question relates to Timber Home Foundations: Screw Piles, Raft & Strip Options, which covers the broader topic in detail. Understanding this specific aspect helps architects, builders, and timber dealers make informed specification decisions.

For full context and additional technical detail, see our comprehensive guide:

→ Timber Home Foundations: Screw Piles, Raft & Strip Options

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About this answer

This answer is part of the PuurModulair Knowledge Base — comprehensive timber specification guidance for architects, builders, and dealers across the UK, EU, and Scandinavia.