Lap cedar has long been a favored choice for exterior siding due to its natural beauty, durability, and aging characteristics. This article explains what cedar lap siding is, how gaps affect performance, and best practices for installation, maintenance, and selection to help homeowners achieve a lasting, low-maintenance exterior.
What Is Cedar Lap Siding
Cedar lap siding is a horizontal boards system where each piece overlaps the board below to shed water and create a weather-resistant barrier. The “lap” design reduces direct exposure to precipitation and helps channels moisture away from the structure. Cedar’s natural oils and tight grain resist rot and insect intrusion better than many other softwoods, making it a popular choice for American homes. The wood’s color can range from light tan to reddish hues, and it patinas gracefully with age.
Benefits Of Cedar Lap Siding
- Natural Beauty: Distinctive grain patterns and warm tones enhance curb appeal.
- Durability: Cedar resists warping and shrinking when properly installed and maintained.
- Moisture Management: The lap design aids in shedding water and reducing surface moisture.
- Insulation Properties: Cedar provides modest insulation and can contribute to energy efficiency.
- Enviro-Friendly: Cedar is a renewable resource when harvested responsibly.
Gaps In Cedar Lap Siding: Why They Matter
Gaps between cedar boards influence ventilation, moisture movement, and skinning of the finish. Proper gaps accommodate cedar’s expansion and contraction with temperature and humidity changes. Small gaps can trap moisture, leading to staining or mildew, while overly large gaps can reduce weathertightness and energy efficiency. The goal is to balance drainage, ventilation, and appearance to maximize longevity.
Installation Essentials For Cedar Lap Siding
Preparation And Surface
Ensure the substrate is clean, dry, and structurally sound. Any existing rot should be repaired, and underlying insulation or house wrap should be intact. Install a proper rain screen or furring to promote drainage and airflow behind the siding.
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Gap Spacing And Expansion
Expansion gaps are essential to accommodate cedar’s movement. Typical top-to-bottom spacing varies by product and climate, but common practice includes leaving a small interior expansion gap at the ends of boards and aligning gaps to maintain a uniform appearance. For tight climates, slightly larger gaps can prevent binding and buckling over time.
Fasteners And Nailing
Use corrosion-resistant fasteners designed for exterior wood, such as hot-dipped galvanized or stainless-steel nails or screws. Nails should be driven flush or slightly inset, leaving room for cedar expansion. Avoid overdriving, which can starve the wood of movement space and invite splits.
Finishing And Sealing Gaps
Apply a high-quality penetrating stain or sealant to cedar surfaces to protect against UV exposure and moisture. Finish both faces, ends, and the edges to minimize checking. Periodic reapplication, typically every 3–5 years depending on climate and product, helps maintain color and protection.
Maintenance For Long-Term Performance
Regular inspection is key. Look for cracks, cupping, or loose boards, and check caulk lines around windows and doors. Clean cedar with a gentle, non-alkaline cleaner to remove mildew and dirt build-up. Avoid pressure washing directly on joints, which can force water behind the siding and degrade the substrate. If stains appear, address moisture, inspect for rot, and re-seal affected boards promptly.
Choosing The Right Cedar Species And Grade
Two common options are Western Red Cedar and Eastern White Cedar. Western Red Cedar is favored for its rich color, stability, and insect resistance, while Eastern White Cedar offers lighter tones and solid rot resistance. Grades range from clear or select to standard; higher grades show fewer knots and tighter grain, influencing aesthetics and cost. Consider climate, aesthetic goals, and budget when selecting species and grade.
Environmental And Aesthetic Considerations
Environmental responsibility includes selecting cedar sourced from sustainably managed forests and finishing with low-VOC sealants to minimize indoor air quality concerns. Aesthetically, cedar patinas with sun exposure, developing a silvery gray or deeper bronze tone depending on finish and climate. Regular maintenance preserves color consistency and the expected lifespan of lap siding.
Common Issues And Practical Solutions
- Peeling Finish: Refinish and reseal affected boards; check for moisture intrusion.
- Warping Or Buckling: Verify proper nailing method, spacing, and existing moisture levels; replace damaged boards.
- Mildew Or Mold: Clean with a mild solution and improve ventilation or rain-screen clearance.
- Gaps Widening: Re-seal edges and consider a thicker board or adjusted gap pattern for future installations.
Comparison: Cedar Lap Siding Versus Alternatives
| Material | Pros | Cons | Best For |
|---|---|---|---|
| Cedar Lap Siding | Natural beauty, good moisture management, durable | Higher maintenance, cost varies | Traditional American homes seeking warmth |
| Fiber Cement Lap Siding | Low maintenance, fire resistant, durable | Heavier, less natural feel | Low-maintenance replacements |
| Vinyl Siding | Low cost, easy installation | Limited color aging, less breathable | Budget projects with quick installs |
Tips For A Successful Cedar Lap Siding Project
- Plan for expansion gaps at joints and ends according to climate and board width.
- Choose fasteners compatible with outdoor use to prevent corrosion.
- Invest in a rain screen or ventilated cavity behind the siding for longevity.
- Apply a UV-protective sealant to all surfaces and recoat as recommended by the manufacturer.
- Work with a contractor experienced in cedar detailing to ensure correct alignment and finish.
Low-Maintenance Practices To Extend Life
Annual inspections, cleaning with mild solutions, and timely resealing are the pillars of cedar lap siding longevity. Address moisture intrusion quickly, and avoid cleaning methods that force water behind boards. Routine care helps preserve color integrity and structural performance for decades.