Openings
Lintels, end bearings, cavity trays, stop ends, weeps, closers and insulation must work as one coordinated detail.
Contact Clause collection 03 / External Walls Above DPC
A wall is only as dependableas its junctions.
The broad wall construction is usually easy to name. Performance is more often lost at openings, cavity interruptions, movement joints, abutments and penetrations. The current B series contains 20 numbered clauses covering the wall and the details that allow it to work.
Register interest- Section
- B series
- Status
- 20 clauses / Preparing for publication
- Emphasis
- Junctions, continuity and weathering
01 / Where difficulty begins
The elevations can look complete while critical details remain undecided.
A general wall description does not tell the contractor how continuity is maintained where the construction changes.
Lintels, trays, closers, insulation, movement joints and penetrations are small parts of the drawing, but they govern how the completed wall manages water, heat, movement and fire.
When those requirements are scattered or assumed, tenderers price different details and the missing decisions eventually return as site queries, substitutions or defects.
02 / Where assumptions gather
The wall is built one interface at a time.
Movement
Joint locations, widths, ties, sealants and the treatment of finishes need defining before cracking writes the detail afterwards.
Continuity
Insulation, cavity protection, fire barriers and weathering must continue around penetrations, abutments and changes in construction.
03 / The practical answer
Specify the wall. Then specify what interrupts it.
The B series separates recurring wall operations into clauses that can be selected and coordinated with the project details.
The aim is a specification that defines the principal construction and the junctions affecting performance without burying the reader in irrelevant method statements. The professional retains control of the selected system, appearance and project-specific design.
04 / Within the collection
20 clauses covering the wall and the details that allow it to perform.
The collection currently contains 20 numbered B-series clauses. It remains under publication review while the clauses and supporting material are checked as a complete working collection.
- B01External Cavity Walling Above DPC
- B02Cavity Wall Insulation and Thermal Continuity
- B03Wall Ties, Bed Joint Reinforcement and Restraint
- B04External Wall Cavity Trays, Stop Ends and Weep Vents
- B05Lintels to External Cavity Walls
- B06Movement Joints in External Masonry
- B07Cavity Closers and Insulated DPC Closers
- B08Facing Brickwork Above DPC
- B09Block Inner Leaf Walling Above DPC
- B10Rendered External Blockwork Above DPC
- B11External Render Systems
- B12Parapet Walls to External Masonry Construction
- B13External Masonry Abutments, Junctions and Interfaces
- B14Masonry Cills, Heads, Copings and Features
- B15Masonry Support Shelf Angles and Restraint
- B16Stone Faced External Cavity Walling
- B17Brick Slip and Masonry Slip Systems
- B18External Wall Cavity Barriers and Fire Stopping
- B19External Wall Service Penetrations and Openings
- B20External Wall Cleaning, Protection and Completion
Preparing for publication
Follow the collection as it develops.
If external walls are part of the work you regularly specify, register your interest and we will send publication details when the collection is ready to inspect.
Register interest