⭐ Upgrade to Pro - £19
Unlock all lessons and mock exams to pass Level 2 + Level 3 theory exams.
Upgrade nowNotching and Drilling Joists
Read through the material below, then test your understanding.
Module Lessons
Common Plumbing Processes
Basic Hand Tools
Specialist Plumbing Tools
Power Tools
Copper Tube Specifications
Machine Bending Copper
Spring Bending Copper
Soldered Capillary Joints
Compression and Press-Fit Joints
Low Carbon Steel (LCS) Pipework
Jointing LCS Pipe
Plastic Pressure Pipe (PE & PB-1)
Jointing Plastic Pressure Pipe
Sanitation Plastics (PVCu, ABS, PP)
Jointing Sanitation Plastics
Preparation of the Work Area
Notching and Drilling Joists
Pipe Clips, Brackets, and Fixings
Installation Techniques
Testing and Commissioning
Lesson Overview
Installing pipework beneath timber floors requires strict compliance with structural building regulations. This guide details the exact statutory limits for notching and drilling joists without weakening the building.
Learning Objectives
Identify the permissible zones and maximum dimensions for notching solid timber joists.
Calculate the correct positioning, diameter, and spacing rules for drilling holes through joists.
State the installation and protection requirements for pipework passing through suspended timber floors.
Unlock the full lesson & knowledge check
Get lifetime access to every Level 2 & 3 lesson, 3500+ total questions, and timed City & Guilds mock exams.
Get Pro Access (£19)Already have Pro? Sign in
Interactive City & Guilds Level 2 and Level 3 plumbing lessons, flashcards and mock exams, built for UK students and professionals.
© 2026 PlumbingIQ. All rights reserved.