How To Install Cedar Shingles: A Master Craftsman Guide To Flawless Siding

Installing cedar shingles requires strict adherence to climate-specific moisture gaps, proper fastener penetration, and precise double-coursing techniques to achieve a weather-tight exterior that lasts for decades. Mastering the nuances of grain orientation, offset spacing, and breathable underlayments prevents premature cupping, splitting, and rot.

Pre-Operation & Equipment Checklist

Achieving a professional-grade exterior cedar shingle installation demands careful preparation, specialized tools, and adherence to Western Red Cedar Lumber Association (WRLA) building standards. Before lifting the first bundle, verify that your materials have acclimated to the local relative humidity and that your structural framing meets all building code requirements for moisture barriers.

• Essential Tools & Gear: Stainless steel or hot-dipped galvanized ring-shank nails, pneumatic shingle siding nailer, chalk line, straightedge, stainless steel hammers, utility knife, block plane, tin snips, tape measure, and OSHA-compliant scaffolding.
• Materials & Hardware: Grade A Certigrade Western Red Cedar shingles, breathable house wrap or asphalt-saturated breather felt, non-corrosive flashing, and woven corner strips.
• Standards & Metrics: Target a 3/8-inch to 1/2-inch overhang at the drip edge, maintain a 1/4-inch expansion gap between individual shingles, and secure every shingle with two nails driven 3/4 inch from each edge.
• Time & Scope Benchmarks: A standard two-person crew can typically install, course, and trim approximately 100 to 150 square feet (one square) of single-course wall installation per working day.

Step-by-Step Cedar Shingle Installation Workflow

Step 1: Substrate Preparation and Weather-Resistive Barriers

Ensure the exterior sheathing is completely dry, clean, and structurally sound before applying any siding materials. Install a high-performance, breathable weather-resistive barrier (WRR) over the wall sheathing, overlapping horizontal seams by at least 6 inches and vertical seams by 4 inches to shed any intruding moisture. Never install cedar shingles directly over impermeable plastic vapor barriers, as trapped moisture will cause the wood to decay rapidly from the inside out.

Warning: Avoid standard electro-plated galvanized fasteners, as the natural tannins in cedar will react chemically with the zinc, causing unsightly black bleeding streaks and accelerated nail head corrosion.

Step 2: Establishing the Starter Course and Layout Lines

Snap a chalk line around the perimeter of the structure to establish the exact bottom edge of the starter course, ensuring it sits a minimum of 6 inches above final grade and 2 inches above roof lines. Install a double-thick starter course at the base to ensure proper overhang and to kick the first visible row outward for optimal water shedding. Use wood shims or a starter strip behind the bottom of the first course to set the initial pitch correctly against the vertical wall plane.

Step 3: Laying Out Courses and Spacing Shingles

Measure up from the starter course to mark subsequent horizontal coursing lines based on your chosen exposure length, typically 5 inches for standard 16-inch shingles. Snap chalk lines at every course or every third course to keep rows perfectly level around corners and windows. Lay out shingles loosely along the course before nailing to check for uniform spacing, ensuring a 1/4-inch gap between adjacent shingles to accommodate natural expansion during wet weather cycles.

Pro-Tip: Sort your bundles before installation, blending shingles of varying widths to prevent repetitive vertical shadow lines and create an aesthetically balanced, random-width appearance across the facade.

Step 4: Fastening Techniques and Edge Offsets

Drive two ring-shank nails per shingle, positioned approximately 3/4 inch from each edge and 1 inch above the butt line of the succeeding course. Drive nail heads flush with the wood surface without sinking them below the wood fibers, which can split the shingle or create depressions that trap water. Ensure that the vertical joints between shingles in any single course are offset by at least 1 1/2 inches from the joints in the courses immediately above and below them.

Step 5: Fitting Corners, Openings, and Flashing Details

For outside corners, use the woven corner method by alternating overlapping shingle ends from adjacent walls, or install pre-made corner posts plumb and square before running field shingles into them. Around windows and doors, install proper head flashing, sill pans, and side jamb flashing before bringing cedar shingles tight to the trim with a consistent 1/4-inch caulking or expansion gap. Trim excess shingle overhangs cleanly at window frames and inside corners using a sharp utility knife and a metal straightedge.

Technical Specifications & Material Thresholds

Common Site Failures & Field Fixes

• Root Cause: Fasteners driven too close to the edges of wide shingles, causing edge-splitting during seasonal humidity shifts.
  
  
  • Actionable Fix: Remove split shingles carefully using a shingle ripper tool, slide in a new replacement shingle, and nail it securely using pre-drilled pilot holes if necessary, ensuring fasteners are kept at least 3/4 inch inward from the edges.
• Root Cause: Lack of adequate expansion gaps between adjacent shingles, leading to buckling and cupping as the wood absorbs moisture.
  
  
  • Actionable Fix: Cut out buckled sections using a fine-toothed hand saw or multi-tool, create a proper 1/4-inch expansion gap, and install a patch shingle secured with corrosion-resistant face nails.
• Root Cause: Dark staining or streaking appearing near fastener heads due to chemical reactions between standard steel nails and cedar tannins.
  
  
  • Actionable Fix: Punch offending standard nails below the surface, seal the holes, and re-fasten using high-grade type 316 stainless steel ring-shank nails. Treat existing tannin stains with a specialized oxalic acid wood brightener.

Frequently Asked Questions

What is the ideal weather exposure for 16-inch cedar shingles?

For standard single-coursing applications, 16-inch shingles should be exposed a maximum of 3 3/4 inches to the weather. If you are utilizing a double-coursing technique for added architectural depth and economy, the exposure can be safely increased up to 5 inches.

Should cedar shingles be pre-stained or finished after installation?

It is best to apply a breathable, oil-based primer or penetrating semi-transparent stain to all six sides of the shingles prior to installation to ensure total moisture protection. If using unfinished kiln-dried cedar, apply a compatible exterior finish within two weeks of installation before weathering can degrade the surface wood fibers.

Why is a breathable house wrap required under cedar siding?

Cedar contains natural water-soluble extractives that can leach out when exposed to trapped moisture. A breathable weather-resistive barrier allows moisture vapor migrating outward from the interior of the structure to escape while blocking liquid water infiltration, preventing premature rot and coating failure.

How do you handle outside corners when installing cedar shingles?

Outside corners can be constructed using either the woven method, where alternating courses overlap each other for a seamless traditional look, or by butting the field shingles against a square 1x corner board trim piece plumbed on the corner. Both methods require careful flashing underneath to ensure a watertight seal at the vulnerable junction.

Protect Your Investment with Expert Craftsmanship

Investing time in precise layout planning, using premium stainless steel hardware, and maintaining strict installation tolerances ensures your cedar shingle siding will provide exceptional beauty and weather protection for decades. Start your project with confidence by sourcing high-grade materials and adhering strictly to professional siding standards.