Caleb Foster
Installing Hardie board trim can be a challenging task. While some people opt for modern methods such as caulk, glues, and tab methods, others prefer the traditional approach of face nailing. The choice of fasteners is crucial, with options ranging from stainless steel finish nails, trim-head screws, and hot-dipped galvanized nails to using a nail gun. The type of nailer and nail size also play a significant role in achieving a successful installation. To avoid a high number of holes, some individuals choose to caulk behind each nail or use touch-up paint to conceal them.
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What You'll Learn
Use stainless steel nails
When nailing Hardie board trim, it is recommended to use stainless steel finish nails. This is because stainless steel is more rust-resistant than other types of nails, such as galvanised nails, which can rust and corrode over time, especially if exposed to water.
For fastening HardieTrim products, James Hardie, the manufacturer of Hardie boards, specifically recommends using 2-inch stainless steel finish nails. This length is important because longer finish nails may bend. When using a nailer, be sure to keep it firmly against the Hardie board until the nail is properly seated. If you pull away too soon, the nail may not be set correctly, and stainless steel nails can bend or break if you try to hammer them in manually.
If you are nailing Hardie board siding, you can use a 15-gauge trim nailer and putty over the nail heads. A 15-gauge nailer with 2 1/2-inch nails is also an option, but be careful to not get too close to the edge and slightly angle the nails toward the centre. You can also use a roofing nailer with 1 1/2-inch nails or a Bostitch siding nailer with 2 1/2-inch siding nails.
When using stainless steel nails, it is important to note that they are more expensive than other types of nails. However, they will provide better long-term performance due to their corrosion resistance.
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Use a nail gun
Using a nail gun is a common and straightforward method for nailing Hardie board trim. However, it is important to use the right type of nail gun and nails to ensure the nails penetrate the trim properly.
If you are using a nail gun, it is recommended to use a finish nail gun or a siding or roofing nail gun. These nail guns should be adjusted to the appropriate settings for Hardie board trim. It is also important to ensure that the backing behind the trim is solid, as nails may not penetrate properly if the backing is spongy.
When selecting a nail gun, consider the thickness of the Hardie board trim. Thicker trim may require a more powerful nail gun, such as a Bostitch nailer, to ensure proper penetration. Additionally, the use of stainless steel nails is recommended as they are stiffer and may provide better penetration than other types of nails.
To ensure the best results, it is suggested to test the nail gun and nails on a small piece of Hardie board trim before starting the project. This will allow you to adjust the nail gun settings and ensure that the nails penetrate properly. If you don't own a nail gun, consider renting one from a hardware store to test its performance before purchasing.
It is important to prioritize safety when using a nail gun. Always wear eye protection, especially when working in areas with high dust levels, such as basements. Additionally, ensure that the nail gun is properly maintained and in good working condition to avoid injuries and project delays.
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Pre-drill holes
When nailing Hardie board trim, pre-drilling holes is an important step to ensure the nails penetrate properly and the trim is securely attached. Here are some detailed instructions and considerations for pre-drilling holes:
First and foremost, it is recommended to use stainless steel finish nails when installing HardieTrim products. A 2-inch finish nail is ideal for fastening the trim together, as longer nails may bend. It is also crucial to keep the nailer firmly pressed against the Hardie material until the nail is fully seated. Pulling away too soon can result in an improperly set nail.
Pre-drilling holes is especially important when working with hard or solid backing materials. If the backing behind the trim is spongy or soft, the nails may not penetrate effectively, and increasing pressure may not always solve the problem. By pre-drilling holes, you can ensure that the nails have a clear path to penetrate and hold the trim securely in place.
The type of nail and nail gun used can also impact the need for pre-drilling. Some individuals have reported success with hot-dipped galvanized nails, while others prefer stainless steel nails for their stiffness. If you're using a nail gun, ensure that the gun is compatible with the nails and the material you're working with. For example, a Bostitch finish nailer should not exceed 100 psi, or you risk damaging the o-rings and weakening each pin strike.
When pre-drilling holes, it is essential to use the right type of drill bit. A counter-sink drill bit is recommended by some professionals, as it allows the nail head to sit flush with or slightly below the surface of the trim. This helps achieve a smooth and seamless finish.
While pre-drilling holes is a necessary step in some cases, it is worth noting that trim nails may pull through over time. As an alternative, you can consider using trim-head screws, such as stainless trim-head screws or coated trim-head screws, which can provide better long-term results. However, screws may not be suitable for all Hardie products and can be more time-consuming to install.
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Use hot-dipped galvanised nails
When nailing Hardie siding, it is recommended to use either hot-dipped galvanised nails or stainless steel nails. These materials are highly resistant to corrosion and can withstand harsh outdoor conditions.
Hot-dipped galvanised nails are coated in a layer of zinc, which protects them from corrosion and gives them a longer lifespan compared to other types of nails. They are ideal for outdoor applications where the nails will be exposed to moisture and extreme weather conditions.
When using hot-dipped galvanised nails for Hardie board trim, it is important to consider the length and type of nail. The nail should be long enough to securely attach the trim without damaging the material. The two most common types of nails used for Hardie siding are siding nails and roofing nails. Siding nails have smaller heads and are designed specifically for siding installation, while roofing nails have larger heads and are often used for attaching trim to the siding.
It is also worth noting that Hardie siding nails typically have a ring or spiral shank, which provides better holding power. These nails have sharp diamond points designed to pierce through the siding without splitting it. When installing Hardie shingle siding, it is recommended to use a nail length that is at least 1 1/4 inches long, ensuring penetration through both the siding and the underlying sheathing for a secure installation.
Some sources suggest using a siding nail gun for installing Hardie siding, as it uses smaller nails that provide sufficient holding strength without damaging the material. However, a framing nailer can be used if the nails are long enough to securely attach the siding without compromising its integrity.
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Fill nail holes with paint or putty
Filling nail holes with paint or putty is a straightforward process that can greatly improve the final appearance of your project. Here is a step-by-step guide to achieving a professional finish:
Prepare the Surface:
Before filling the nail holes, it is essential to clean the area to ensure proper adhesion of the filler material. Use a damp cloth or putty knife to wipe away any dust, dirt, or debris around the nail holes. If there is any loose material or rough edges, gently scrape or sand the area to create a smooth and clean surface for the filler to bond with.
Choose the Right Filler:
Select the appropriate filler material for your specific project. Spackle is typically recommended for smaller nail holes, as it is easy to use and dries quickly. Wood filler or putty is more suitable for larger holes, as it provides superior adhesion and blends seamlessly into existing surfaces. Ensure that the colour of the filler matches the existing paint or surrounding surface.
Fill the Nail Holes:
Using a putty knife, carefully fill each nail hole with your chosen filler material. Apply enough pressure to ensure that there are no gaps between the filler and the surface. If using spackle, squeeze it onto the putty knife and press it into the hole until it is completely filled and smooth. For wood filler, spread it across each side of the gap, ensuring good contact and coverage.
Allow Drying and Sanding:
Give the filler ample time to dry completely before proceeding. Once dry, use fine-grit sandpaper to gently sand the filled areas, creating a smooth and uniform surface. Sanding is crucial for achieving a seamless finish, as it helps to blend the filled areas with the surrounding surface. Remove any excess filler and smooth out any uneven spots.
Painting:
After sanding, you can apply a coat of primer to the filled areas. Priming ensures uniform paint absorption and promotes better adhesion. Finally, paint over the primed areas, matching the colour to the surrounding surface. With the right preparation and materials, your filled nail holes will become virtually invisible, resulting in a professional and flawless finish.
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Frequently asked questions
It is recommended to use stainless steel finish nails when installing HardieTrim products. You should use 2-inch finish nails to fasten the trim together.
There are several methods to attach Hardie trim. One way is to use a nail gun, but it is important to ensure that the backing behind the trim is solid for the nails to penetrate properly. Another method is to pre-drill and hand-nail using hot-dipped galvanized nails.
You can use Hardie putty to fill in the nail holes. Simply apply the putty with a small squeegee and let it dry. Once it is dry, you can paint over it. Alternatively, you can use touch-up paint to cover the nail holes.
