Cedar shake siding can last for decades, but split, loose, or missing pieces may let water reach the wall beneath. A sound repair starts with finding the cause—not just covering the damage. Learn how to inspect cedar shakes, replace individual pieces, address moisture problems, and decide when professional help is the safer choice.
Why Cedar Shake Siding Needs Timely Repairs
Cedar is a natural wood product that expands and contracts as moisture levels change. Shakes can crack, curl, split, or loosen with age and exposure to sun, wind, rain, and snow. Damage may also result from impact, poor drainage, failing flashing, or water trapped behind the siding.
A damaged shake is more than a cosmetic problem. Water that gets past the siding can affect the underlying sheathing and framing, while persistent dampness may contribute to rot or mold. Promptly replacing a small number of failed pieces can help limit the scope of a later repair.
Not every discoloration indicates siding failure. Cedar naturally changes color with weathering, and surface stains may have different causes. The key questions are whether the wood is sound, whether pieces remain securely installed, and whether water is reaching the wall assembly.
Inspect the Siding Before Starting
Walk around the house and inspect the siding from the ground. Look for missing or broken shakes, raised edges, open joints, exposed fasteners, soft-looking wood, and gaps around windows, doors, rooflines, and utility penetrations. Binoculars can help with upper stories; climbing a ladder just to inspect is not worth an avoidable fall.
Check nearby gutters, downspouts, roof edges, and landscaping. Overflowing gutters, roof runoff, sprinklers that repeatedly wet one wall, and shrubs pressed against siding can all contribute to moisture problems. Look for stains or deterioration around corners and openings, where flashing and trim details matter.
Where it is safe and accessible, gently press questionable wood with a small tool. Sound cedar should feel firm; soft, crumbly, or deeply cracked pieces may need replacement. Do not puncture intact siding unnecessarily. If damage appears to extend behind the shakes, or the wall feels soft, a siding repair alone may not solve the problem.
Before removing old material, consider the home’s age and renovation history. Older coatings can contain lead, and some older building materials may contain asbestos. The U.S. Environmental Protection Agency recommends testing or using qualified professionals when lead-based paint may be present. Avoid sanding, grinding, or creating dust until the material has been assessed.
Choose the Right Cedar Replacement
For a durable repair, the replacement should be compatible with the existing siding in material, exposure, thickness, and profile. Cedar shingles are generally sawn smooth, while shakes are typically thicker and may have a split or textured face. They are not always interchangeable, and the existing installation may have additional variations.
Remove a damaged piece carefully and use it as a template for length and width. If it is too deteriorated to measure reliably, compare it with neighboring pieces and check how much of each course is exposed. A local lumberyard or siding supplier may be able to match the wood and profile. Bring a sample if possible.
Western red cedar is commonly used for siding, but the existing product may be another cedar species or a particular grade. Match the original material where practical. A noticeably different replacement can weather to a different color, even if it looks similar when new.
Also determine whether the siding is painted, stained, or left unfinished. Replacement pieces may need a compatible finish, but finish choices depend on the product and the home’s existing coating. Follow the coating manufacturer’s instructions and local requirements; do not assume a new finish can be applied over every old one.
Tools and Materials for a Small Repair
A typical single-shake repair may require a flat pry bar, hammer, utility knife or fine-tooth saw, tape measure, replacement cedar, corrosion-resistant siding nails, and eye and hand protection. A scrap piece of wood can protect adjacent shakes when prying or driving fasteners. A stable work surface is essential for cutting.
Use fasteners intended for exterior wood siding, such as corrosion-resistant stainless steel or hot-dipped galvanized nails, and verify compatibility with the cedar and any nearby metals. Ordinary steel fasteners can corrode, stain the wood, or fail in wet conditions. Nail length and placement should follow the siding manufacturer’s guidance and suit the wall assembly.
Keep the repair focused. Cedar siding generally relies on overlapping courses to shed water; indiscriminate use of caulk can block drainage or trap moisture. Sealant is appropriate only where the original detail or product instructions call for it, such as certain transitions. It is not a substitute for missing flashing or correct overlap.
How to Replace a Damaged Cedar Shake
Remove the failed piece
Work carefully to avoid cracking the sound shakes above and beside the damaged one. Use a thin pry bar to lift the piece enough to expose its fasteners. If nails cannot be removed without damaging neighboring siding, cut or break the damaged shake into smaller sections and remove them gradually. Avoid forcing a tool behind the weather-resistive barrier.
Check the exposed area for signs of wet sheathing, decayed wood, insect activity, or damaged building paper. If the backing is sound and dry, continue with the siding repair. If it is soft, wet, or visibly deteriorated, stop and investigate the wall before installing a replacement.
Prepare and fit the replacement
Measure the opening and cut the replacement shake to fit. Allow the side joints and exposure to match the existing installation rather than creating a tight, forced fit. Wood moves with changes in moisture, so follow the product guidance for appropriate spacing. Do not shave neighboring shakes in a way that compromises their overlap.
Slide the replacement into position beneath the course above it. The upper course should cover the fasteners and protect the joint below. Keep the replacement aligned with adjacent pieces and maintain the original pattern and exposure. If the repair requires removing several courses, or the installation is unusual, a siding professional can help preserve the water-shedding layout.
Fasten without damaging the wood
Fasten the new piece using the number, type, and placement of nails recommended for the specific siding. Nails should secure the shake without being driven so tightly that they split it or restrict normal movement. Avoid placing a fastener where the next course will not cover it unless the original design requires otherwise.
After installation, check that the shake lies flat, neighboring pieces remain intact, and the course above still overlaps it. Remove debris from the work area. Apply a compatible finish only if appropriate for the existing siding and according to product directions.
Repairing Cracks, Loose Shakes, and Larger Damage
A small surface crack in a shake that remains firm and securely installed may not require replacement. Monitor it and address the moisture or impact source. Filling a crack with a rigid material can be a poor fix if the wood continues to move; repairs should not block drainage or create a pocket that holds water.
For a loose but sound piece, identify why it moved before refastening it. A failed or corroded nail may be the cause, but movement can also signal a poor installation or a damaged backing surface. Refasten only when the shake and the material beneath it can hold an appropriate exterior fastener.
When multiple shakes are damaged in one area, inspect the wall for a shared cause, such as a leaking gutter, roof intersection, or window flashing problem. Replacing each shake without correcting the source can lead to repeated failures. Extensive rot, widespread loose siding, or damage around a structural opening calls for a qualified contractor.
Prevent Future Cedar Siding Damage
Keep gutters and downspouts clear and direct water away from the foundation. Repair roof leaks and damaged flashing promptly. Trim plants so air can circulate around the siding, and adjust sprinklers so they do not soak the walls. These basic steps reduce repeated wetting, though they cannot replace proper flashing or ventilation details.
Inspect the siding at least once a year and after severe storms. Pay particular attention to lower wall sections, corners, roof-to-wall intersections, and openings. Record problem areas with photographs so changes can be compared over time. Regular observation can reveal recurring moisture patterns before they spread.
Cleaning and finishing practices should suit the siding and coating. Avoid aggressive pressure washing, which can damage wood, drive water behind the siding, and strip finishes. Use product-specific instructions for cleaners and coatings. If the home has historic cedar siding, consult a preservation professional before changing its finish or replacing a large area.
Properly installed siding depends on more than the visible shakes. The wall’s water-resistive barrier, flashing, drainage paths, and ventilation all help manage moisture. The U.S. Department of Energy’s building-envelope guidance emphasizes controlling bulk water and managing moisture in wall assemblies. When those components are uncertain or damaged, a surface-level repair may not be enough.
When to Hire a Siding Contractor
Professional help is advisable for repairs high above ground, extensive damage, soft or decayed sheathing, recurring leaks, and work near complex roof or window flashing. A contractor can remove enough siding to inspect the underlying assembly and address the source rather than simply covering symptoms.
Seek a contractor experienced with wood siding, and ask how the repair will preserve the existing overlap and drainage details. Request a written scope that identifies the cause of damage, any work to the underlying wall, the replacement material, fasteners, and finish. For older homes, ask how the contractor handles suspected lead paint and debris containment.
Costs vary by region, access, material availability, height, and whether hidden wall damage is found. Replacing one accessible shake is generally a smaller task than repairing a whole wall or rebuilding a flashing detail. Quotes based only on visible damage may change if removal reveals rot, so clarify how concealed conditions will be handled.
Common Cedar Shake Repair Mistakes
- Ignoring the water source: A replacement shake will not stop damage caused by a leaking roof, overflowing gutter, or failed flashing.
- Using incompatible fasteners: Corroding nails can stain cedar and weaken the repair. Choose exterior-rated fasteners suitable for the material.
- Overdriving nails: Excessive force can split the shake or prevent normal movement.
- Caulking every joint: Unnecessary sealant can interfere with drainage and moisture movement.
- Choosing a poor match: Different thickness, exposure, or profile can disrupt the siding’s appearance and overlap.
- Working unsafely: High siding repairs, unstable ladders, and dust from old coatings create hazards. Use appropriate equipment or hire a professional.
Sources and Further Guidance
Homeowners can review the U.S. Environmental Protection Agency’s information on lead sources and lead-safe practices before disturbing older painted siding. The U.S. Department of Energy provides guidance on moisture control in homes, including the importance of managing water in building assemblies. Product-specific installation and maintenance instructions from the siding and finish manufacturers should guide fastener choice, spacing, and coating decisions.