Essential tips for DPC and Weep Hole compliance

Ensuring compliance and delivering quality builds starts with getting the details right. damp-proof courses (DPC) and weep holes play a crucial role in keeping moisture out, maintaining durability, and meeting NCC standards.

Here’s how a proactive approach to these elements can streamline your projects and avoid inspection setbacks.

Why DPC and weep holes matter

DPCs prevent rising damp in masonry, while weep holes allow moisture to escape, protecting against structural damage and mould. Correct placement ensures your project remains compliant and avoids costly adjustments later.

Key considerations for compliance

Follow NCC requirements:

• DPC must be a minimum of:
• 150mm above adjacent ground level
• 50-75mm above paved or concreted areas that slope away from the wall (50mm is only permitted with compliant surface drainage and area covered)
• Weep holes should be positioned immediately above the DPC or flashing. (Refer to NCC clause 5.7.4 for detailed requirements.)

Coordinate termite management systems (TMS):

• While TMS can sometimes double as DPC, ensure your setup meets compliance for both purposes. Early communication with your TMS provider is essential.

Plan for adjacent surfaces:

• Anticipate pathways, patios, or driveways that may sit near DPC levels. Adjustments like deeper slab rebates can help position the DPC and TMS correctly.

Quick checklist for compliance

1. Visible DPC: Ensure the DPC is visible on the wall’s exterior face.
2. Proper weep hole placement: Position weep holes directly above the DPC or flashing.
3. Meet spacing & height requirements:

• Minimum weep hole height: 50mm
• Maximum spacing: 1.2m apart

Tip: Early coordination with your team and subcontractors can help you stay ahead of compliance requirements.

Proactive planning for smooth inspections

The Building Commission has been focusing on masonry and weatherproofing compliance, making it even more important to address DPC and weep hole placement early in your project. Collaborating with bricklayers and TMS contractors ensures that these elements align with regulations and avoid delays.

Building with confidence

At Buildcert, we’re here to support you with the expertise and guidance you need to deliver compliant, high-quality projects.

If you have any questions or need further assistance with DPC and weep hole placement, our team is ready to help.

Let’s continue building with confidence together.