Building components · Roof Carcass & Edges
Tile Batten
Explains the batten as the element carrying the covering, and why a small member is nevertheless structural.
Educational reference entry. What this element has to do, and whether any particular arrangement of it is adequate, depends on the whole assembly, the loading, the exposure, local requirements, the manufacturer's instructions and qualified professional design.
Overview
What a tile batten is
Tile battens run horizontally across the rafters at regular intervals, and the covering units hang on or fix to them. They are what turns a sloping structure into something a tile or slate can be attached to.
They are small members carrying a substantial and permanently applied load, spanning between rafters and taking foot traffic during installation and maintenance. That combination is why batten quality and fixing are specified rather than assumed.
Boundaries
How it differs from nearby elements
The distinctions that keep this entry from being a restatement of its neighbours.
- It is not a purlin. A purlin supports rafters; a batten is carried by them and supports the covering.
- It is not a counter-batten. A counter-batten runs up the slope beneath the tile battens to create a drainage and ventilation path; a tile batten runs across.
- It is not sheathing. Sheathing closes the plane continuously; battens are spaced members with gaps between.
Terminology
Common names and aliases
These names describe the same element. The library keeps one entry per component so that a trade term or a regional name never becomes a second, thinner page.
- battens
- roofing batten
- tiling batten
- slating batten
Dependencies
What it depends on
What has to be right elsewhere for this element to do its job.
- Their spacing, which is set by the covering unit and its required overlap rather than being a free choice.
- Their span between rafters, and the fixings at each crossing.
- The underlay beneath, since water reaching it runs down past the battens and must not be dammed.
- Treatment and grading, given they are permanently concealed and carry the roof covering.
Considerations
Topics that genuinely apply here
Subjects worth discussing about this element. These are discussion topics, never measured values, ratings or performance claims.
Battens sit on top of the underlay, so water shed onto the underlay has to run past them; where they lie flat on it, damming is a recognised concern that counter-battens address.
A batten is permanently concealed under the covering, so its condition is only discovered when the roof is stripped.
Battens carry installers as well as tiles, and their span and fixing account for that.
Batten gauge is set by the covering's headlap requirement, so it is a covering decision rather than a carpentry one.
Materials
Commonly formed from
Material families this element is commonly realised in. This states common practice only — it is not a statement that any of these materials suits this component in a particular building, which depends on the whole assembly and on qualified review.
Assemblies
Building systems this element is met in
The role this component fills inside each assembly. A role describes what the element does there — it is not a statement that this component suits that system in any particular building.
Junctions
Interfaces this element takes part in
Junctions where the condition between this element and another governs how the construction behaves. These name the junction and the subjects it raises; they are not details, arrangements or approved ways of building.
Counter-Batten to Tile Batten
Where battens cross above the underlay, creating or blocking the path water uses to leave the roof.
Raises: Moisture · Drainage · Buildability · Weathering
Verge Covering Termination
Where the roof covering stops at a gable, in the position most exposed to wind uplift.
Raises: Weathering · Moisture · Structural transfer · Buildability
Where it is met
Application contexts
Building contexts where this element is commonly encountered. Association is not recommendation: appearing here does not mean the component suits every instance of that context, or any particular one.
- Pitched Roof
Related elements
Neighbouring components
Typed relationships to other elements. There is deliberately no generic “related” category: an edge that cannot be classified does not exist.
Clarifications
Commonly misunderstood
- That battens are minor timber. They carry the whole covering and are graded and specified accordingly.
- That batten spacing is a matter of preference. It follows from the covering unit and the lap it requires.
Conversations
Questions for qualified professionals
Questions worth asking someone with the project in front of them. This page cannot answer them.
- What batten gauge does the chosen covering require?
- How do the battens span between rafters, and how are they fixed?
- Does water reaching the underlay run past the battens, or is drainage provision needed?
- What grade and treatment applies to battens in this roof?
Go deeper
Related Build Design Hub guides
Planning guidance behind the decisions this element involves.
Preparation
Related planning checklists
Owner-side preparation before the conversation where this element comes up.
What this entry does not do
- No batten size, gauge, span, grade or fixing is stated here.
- Batten specification follows from the covering manufacturer's requirements and from the roof structure.
Roof Carcass & Edges
The battens, boards and edge elements that finish a roof structure and prepare it to receive a covering.
Browse all roof carcass & edges entries →