Board and batten siding adds a charming, rustic appearance to homes, but its longevity depends on proper sealing. A traditional siding style consisting of wide boards and narrow battens. It requires protection against moisture to prevent warping, cracking, decay, and other issues. This guide explains the importance of sealing and provides step-by-step instructions for sealing board and batten siding.
Do I Need to Seal Board and Batten Siding?
Sealing board and batten siding is not an optional step—it’s a necessary part of the installation and maintenance process. Wood board and batten siding is beautiful, but it’s also porous and, therefore, particularly susceptible to moisture and weather-related damage.
A proper sealant creates a barrier that keeps moisture and drafts out, improves insulation, and potentially enhances the home’s energy efficiency. It’s especially important in temperate climates with distinct seasons, as varying humidity levels can cause significant damage.
What Will Happen If I Don’t Seal Board and Batten Siding?
Failing to seal board and batten siding can result in several serious issues:
- Warping: Moisture and changing humidity levels cause the wood boards to expand and contract. In time, this changes the shape of the boards.
- Cracking: Exposure to varying weather conditions can lead to cracks and splits in the siding.
- Rotting: Excessive moisture speeds up decay, undermining the siding’s structural integrity and causing the wood to rot.
- Gaps: Gaps in the siding allow water to penetrate. This can eventually damage the underlying structure.
- Pests: Damp and decaying wood attract pests, such as termites.
These problems affect the home’s overall appearance and can lead to costly repairs. Sealing the siding now could save thousands of dollars in the long run.
How Do I Seal Board and Batten Siding?
Sealing board and batten siding is a project that most homeowners can tackle with the right tools.
Before applying any sealant, you’ll want a clean surface for better adhesion.
On a warm, dry day, use a pressure washer to remove dirt, grime, and loose wood fibers, taking care to not use a high enough pressure that damages the wood. Allow the siding to dry completely before moving on to the next step. Sealing water in will lead to bubbling, peeling, or rot.
To choose the right sealer, think about the type of desired finish, application preferences, climate, and siding manufacturer’s specifications.
Exterior-grade paint provides an excellent finish, but it may not be suitable if you prefer the natural wood look. For a clear finish, opt for products that enhance the wood’s texture and grain.
You can thin some sealers for spraying, while others are designed solely for brush or roller applications. Choose sealers specifically formulated for exterior wood siding for the best durability and effectiveness. Depending on your climate and sun exposure, you might need a product with ultraviolet (UV) protection.
There are three primary methods for applying sealant to board and batten siding—brush, roll, or spray.
The brushing method is ideal for homeowners who want precise control, especially in detailed or intricate areas. It helps to avoid drips and runs, allowing for a clean application. Plus, it’s cost-effective and requires minimal skill. Select a brush with natural bristles, which work well with oil-based sealers and finishes. However, you might need synthetic bristles for water-based sealers.
Rolling the sealer is faster than brushing, which makes it perfect for larger areas. It provides even coverage, helping you avoid patchy finishes, but it can be difficult to reach all crevices if your siding is textured. Take care to prevent splatter. Foam rollers promote even application and reduce the risk of streaks or bubbles.
Spraying sealant is the fastest option and is suitable for professional-grade projects. This method provides even coverage, including on textured and irregular surfaces, but be careful, as it’s easy to overspray. Most homeowners opt for a high-quality sprayer. If you have an air compressor, a high-volume, low-pressure spray gun can save you some cash. Professional models are also available for larger jobs, but they aren’t usually cost-effective if you only need the sprayer for a single-use project.
If brushing or rolling the sealant, follow the wood grain to prevent streaking. If spraying, backrolling with a partner can result in a professional-grade finish.
No matter the chosen method, work in small sections to promote even coverage and drying times. Apply at least two thin, even coats rather than one thick coat to avoid a blotchy appearance. Always allow each coat to try before adding the next.
Sealing Tips
To get the best results when sealing board and batten siding, remember these tips:
- Test the sealer on a small, inconspicuous area first to avoid potential appearance issues and siding damage if you accidentally chose the wrong product.
- Pay extra attention to end grains and joints, as these areas are most susceptible to moisture penetration. Manually add extra sealer on vulnerable areas.
- Use a sealer with UV protection to prevent sun damage and fading, especially for south-facing walls that receive the most sunlight.
- In humid climates, look for sealers with added mildew resistance. Added fungicides can prevent growth in damp or shaded spots.
- For vertical siding, start at the top and work your way down to avoid drips on finished areas.
