Cedar Shingle Batten Spacing: A Practical Guide for Siding and Roofing
Meta description: Learn how to choose cedar shingle batten spacing for siding and roofing, including exposure, drainage, ventilation, fastening, and common installation mistakes.
Cedar shingle batten spacing depends on the application, shingle exposure, and the assembly behind the shingles. On walls, battens often create a ventilated rainscreen and are commonly spaced to align with framing. On roofs, the rules differ: cedar shingles generally need solid sheathing, while some cedar shake systems use spaced sheathing. There is no reliable one-size-fits-all spacing measurement. The product instructions, local building code, and project conditions should determine the final layout.
What “Batten Spacing” Means for Cedar Shingles
Battens are narrow strips of wood or another approved material attached to a supporting surface. They can provide a fastening base, create a drainage and ventilation cavity, or support roofing materials over an open framework. The term is sometimes used loosely to describe the spacing between battens, the gaps between boards, or the distance between rows of roof supports. Those measurements are not interchangeable.
For cedar shingle siding, battens are often installed vertically behind horizontal shingles. This arrangement creates a path for water to drain down and can help air circulate behind the cladding. The distance between vertical battens is usually chosen to provide adequate fastening support and line up with wall framing or sheathing requirements.
For roofing, “batten spacing” may refer to the distance between horizontal support strips beneath shakes. That spacing is tied to the product’s length and intended exposure. Cedar shingles and cedar shakes are different products, and instructions for one should not automatically be applied to the other.
Quick Guide to Cedar Shingle Batten Spacing
| Application | Common approach | What determines spacing |
|---|---|---|
| Horizontal cedar shingle siding over a rainscreen | Vertical battens are often laid out to align with framing, commonly at 16 or 24 inches on center when compatible with the cladding and support system. | Wall framing, shingle fastening requirements, wind exposure, and the rainscreen design. |
| Vertical cedar shingle siding | Horizontal support may be needed, but the assembly must preserve drainage and ventilation. | Shingle layout, fastening zones, and a designed drainage path. |
| Cedar shingle roofing | Typically installed over solid roof sheathing rather than spaced battens. | Shingle manufacturer’s instructions, roof slope, underlayment, and local code. |
| Cedar shake roofing | May use solid sheathing or a manufacturer-approved spaced-sheathing system. | Shake length, exposure, support layout, ventilation, and system specifications. |
These are planning guidelines, not a substitute for product instructions. In particular, a 16- or 24-inch wall layout is not automatically suitable for every shingle product, framing system, or high-wind location.
Cedar Shingle Batten Spacing for Siding
Horizontal Shingles and Vertical Battens
For typical horizontal shingle siding, vertical battens are a common way to create a rainscreen cavity. They should be attached securely to the framing or to a properly designed structural substrate. A layout at 16 inches on center may correspond with common stud spacing; 24 inches on center may match other framing layouts. The correct choice depends on where the battens can be fastened and whether the shingle installation can be supported adequately.
The batten spacing does not set the shingle exposure. Exposure is the portion of each shingle left visible after the next course overlaps it. Exposure is set by shingle length, product grade, weather conditions, and manufacturer guidance. For a wall installation, the shingles themselves are commonly fastened to a suitable backing or support system, rather than treated as though the battens alone automatically provide adequate nailing at every point.
Before construction, confirm the fastening pattern with the shingle manufacturer and the rainscreen-system details. The design should specify batten dimensions, attachment type, cavity depth, screen or insect protection, and how openings are flashed. Thin battens, weak fasteners, or missed framing can compromise the whole assembly.
Drainage and Ventilation Matter as Much as the Measurement
A rainscreen cavity is useful only if water can drain and the cavity can dry. Vertical battens behind horizontal siding generally provide a downward drainage path. The cavity should remain open at appropriate locations, while protected with insect screening where needed. Flashing is essential above windows, doors, penetrations, and transitions so water is directed back outside.
Horizontal battens behind horizontal shingles can interrupt drainage unless the wall system includes a way for water to pass through or around them. For vertical shingles, horizontal supports may be necessary, but the assembly needs a deliberate drainage design, such as an approved cross-batten arrangement or drainage channels. Simply adding battens without considering water flow can trap moisture behind the cedar.
Local climate affects how much protection a wall needs. Wind-driven rain, shaded elevations, coastal exposure, and limited drying conditions can increase the importance of a well-detailed rainscreen. Building codes and local officials may also have requirements for water-resistive barriers, flashing, and exterior wall construction.
Cedar Shingle Roofing: Solid Sheathing Versus Battens
Cedar roofing instructions vary by product. Cedar shingles are commonly installed over solid roof sheathing with the specified underlayment. Cedar shakes, which are generally thicker and more irregular, may be installed over solid sheathing or over spaced sheathing when the manufacturer and applicable code allow that assembly. The terms “shingle” and “shake” are sometimes used casually, but the distinction matters for support and ventilation.
When a shake roof uses spaced sheathing, the strips are generally placed across the roof slope, perpendicular to the rafters. Their layout must support the shakes at the required locations without leaving unsupported edges or creating an incorrect exposure. The spacing is based on the shake’s length and the roof system’s specified exposure—not on a generic rule that applies to every cedar product.
Some systems use a combination of solid and spaced support, or a ventilation underlayment designed for the roofing product. A roofing contractor should follow the complete assembly instructions, including underlayment, starter courses, fastening, ridge details, and valley construction. Spaced sheathing should not be substituted for solid sheathing simply to increase ventilation.
How to Calculate Roof Support Layout
For a manufacturer-approved spaced-sheathing roof, the layout starts with the product’s specified exposure and support details. Exposure is the portion of a shingle or shake visible after the next course is installed. It is not the same as the distance between battens, because the support pattern must account for where each course begins, overlaps, and receives fasteners.
- Identify the exact roofing product. Confirm whether it is a cedar shingle or shake and record its length, grade, and installation instructions.
- Confirm the permitted roof assembly. Check whether the product allows spaced sheathing at the project’s roof slope and location.
- Use the stated exposure and support details. Lay out the rows according to the manufacturer’s diagram, not a guessed fraction of the product length.
- Check fastening locations. Each course must be supported where the required fasteners go, with sufficient backing and edge support.
- Verify ventilation, underlayment, and code requirements. These are part of the roof system, not optional adjustments to batten spacing.
If product instructions are missing or unclear, contact the manufacturer or a qualified cedar-roofing professional before installing the battens. A small layout error can repeat across the entire roof and cause poor support or inconsistent exposure.
Factors That Change the Recommended Spacing
- Product dimensions and exposure: Shingle length, shake length, thickness, and intended overlap affect support requirements.
- Wall or roof orientation: Horizontal siding usually uses a different batten arrangement from vertical siding or roof sheathing.
- Framing layout: Battens need secure attachment to framing or another approved substrate; nominal spacing alone does not guarantee adequate fastening.
- Wind and weather exposure: High-wind areas may require specific fastening schedules or closer support.
- Building-code provisions: Requirements can vary by jurisdiction, roof slope, and construction type.
- Material movement and moisture: Cedar and wood battens respond to moisture. Proper storage, ventilation, and installation clearances help reduce problems.
- Openings and transitions: Windows, doors, corners, eaves, and roof intersections need tailored support and flashing details.
Common Cedar Batten Spacing Mistakes
Using one spacing rule for every project: A wall rainscreen layout and a shake-roof support layout serve different purposes. A measurement suitable for one cannot be assumed to work for the other.
Confusing batten spacing with shingle exposure: Exposure describes the visible face of each course; batten spacing describes support locations or cavity layout. They must be coordinated, but they are not the same measurement.
Installing roofing shingles over open battens without approval: Many cedar shingle roof systems call for solid sheathing. Open spacing can leave inadequate support and may conflict with product instructions or code.
Blocking drainage behind siding: Poorly oriented battens can trap water. The cavity should provide a continuous drainage route, with appropriate flashing and screened openings.
Fastening battens only to the water-resistive barrier or sheathing: The specified attachment must transfer loads to suitable framing or an engineered backing system. Follow the design and fastener schedule.
Ignoring edges and openings: The field spacing may look correct while corners, windows, and roof transitions lack backing or flashing. These areas require planning before the battens go up.
Installation Checklist
- Identify whether the product is cedar shingle siding, cedar shingle roofing, or cedar shake roofing.
- Read the current installation instructions for the exact product and grade.
- Confirm the permitted substrate, roof or wall slope, exposure, and fastening schedule.
- Lay out battens to match framing and the specified support pattern.
- For siding, preserve a continuous, protected drainage and ventilation path.
- For roofing, use solid or spaced sheathing only as approved for that system.
- Detail flashing at openings, penetrations, valleys, ridges, and transitions.
- Check local building-code requirements and obtain permits where required.
Where to Verify Specifications
The most reliable sources are the installation guide for the specific cedar product, the project’s architectural or roofing details, and the applicable local building code. Organizations such as the Cedar Shake & Shingle Bureau publish technical guidance for cedar roofing and siding, while building-product manufacturers provide instructions for their own materials and systems. If these sources differ, the project team should resolve the discrepancy with the manufacturer and local building official before installation.
For most homeowners and builders, the practical answer is straightforward: use the specified rainscreen layout for cedar shingle siding, and do not assume cedar roof shingles belong on spaced battens. Confirm the product, application, support, and exposure first; then establish spacing from the approved assembly rather than relying on a universal number.