LearnEvidence areas

Eight areas where construction product questions usually land.

Almost every enquiry falls into one of eight areas. Each area page sets out what gets asked, which documents decide it, and where the evidence usually falls short.

The areas are reference pages, not sales pages. Use them to sharpen a question before sending it, or to see why the paperwork you have is not quite answering it.

01The index

Evidence areas and the studies behind them

The numbers are only an index for finding your way. They do not rank the areas or say anything about the evidence in them.

  1. Fire performancePerformance duties

    Reaction to fire, fire resistance, classification reports and field of application — checked against the build-up actually proposed.

    The Fire Rating Is Only the Start — Reactive coatings on structural steel only — not evidence for boards or any other product.
    Cavity vs No Cavity? — External-wall fire pathways and assembly scope.

  2. Thermal & U-valuesPerformance duties

    Declared values, U-value calculations and thermal claims — checked against the actual build-up, thickness and substrate.

    Cavity vs No Cavity? — Solar gain and summer heat — climate discussion, not a U-value result.

  3. Moisture & mould riskPerformance duties

    Condensation, moisture and mould queries — the evidence and the assumptions behind it, conditions included.

    Cavity vs No Cavity? — Moisture pathways and cavity functions.

  4. Racking & sheathingPerformance duties

    Racking board evidence — test method, category, frame, fixing pattern and substrate against the project assumptions.

    The Bench has not yet published a racking-specific study.

  5. Façades & external wallsAssemblies and finishes

    Cladding, carrier boards and external wall system evidence — checked against the project detail under scrutiny.

    Cavity vs No Cavity? — The external wall cavity question, worked through in full.

  6. System build-upsAssemblies and finishes

    The core comparison behind most evidence questions: the build-up that was tested against the build-up being proposed.

    Cavity vs No Cavity? — What a wall system must do, and where its interfaces fail.
    The Fire Rating Is Only the Start — Coating system build-up — reactive coatings on structural steel only.

  7. Walls, floors & ceilingsAssemblies and finishes

    Wall, floor and ceiling system evidence against the detail being drawn, specified or installed — junctions included.

    No dedicated Bench investigation yet.

  8. Renders & brick slipsAssemblies and finishes

    Render and brick slip systems reviewed as assemblies — carrier board included — with evidence-transfer risk flagged.

    Cavity vs No Cavity? — Cavity and cavity-free assembly scope — not approval of any render or slip system.

02How this fits together

Areas describe the questions. Studies work one through.

An evidence area describes the questions that keep arriving and the documents that usually decide them. When one question needs the full treatment — all the evidence, weighted, with calibrated conclusions — it becomes a published study in Learn. Where a product sits behind an area's questions, the product records cover the product-specific side.

Ask The Bench

Question sitting in one of these areas?

Send the question, the project detail and the documents you already have. No charge to submit — we quote before any written work starts.

Ask The Bench Ask a quick question

Not sure where your question sits? Find your route ›

What helps us start

  • The question, as it was put to you
  • What the product or build-up is, and where it is going
  • The documents you already have — data sheets, reports, certificates, drawings
  • Any comment from Building Control, the designer or the client
  • When you need an answer

You do not need a complete set to get in touch — send what you have.