Sophia Delgado
There are several methods for driving trim nails. One option is to use a trim nailer gun, which is useful for old houses with plaster walls, as it drives nails instantly without causing cracks. Another method is to use a hammer and a nail set, which involves using deft hammer blows to drive the finish nail so that the top of its head is about 1/16th of an inch below the surface of the finished wood. This technique requires practice and can be challenging, especially for larger finish nails.
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What You'll Learn
Using a nail gun
Nail guns are a great tool to have around the home, especially for DIY enthusiasts. They can be used to drive nails into wood without denting or bashing, leaving a smooth, high-quality finish. When using a nail gun, it is important to choose the right type of nail gun and nail for the job.
There are several types of nail guns available, including pneumatic, electric, and staple guns. Pneumatic nail guns, also known as air nail guns, use compressed air to drive the nails and are a popular choice for professionals due to their power and versatility. Electric nail guns, on the other hand, can be powered by a cord or battery pack and offer the advantage of portability. For tasks such as carpet installation, upholstery repair, or frame making, a staple gun might be a good option.
When using a nail gun, it is crucial to select the appropriate nail size and type. Nail guns are categorised by the thickness or "gauge" of the nails they shoot. The bigger the gauge number, the smaller the nail. For example, 15 and 16-gauge nails are typically used for finish work, while 18-gauge nails are considered mid-size and are often used for trim work. Smaller nails, such as 23-gauge nails, are referred to as "pinners" or "micro pinners" and are suitable for more delicate tasks.
To ensure a secure hold, it is recommended to "toe" your nails, which means giving them a slight angle up, down, left, and right. Nails driven at opposite angles to each other provide greater holding power than nails driven straight into the board. Additionally, when nailing trim, consider using construction adhesive on the back of the trim and driving the nails into the drywall at 45-degree angles. This "trap nailing" technique enhances the stability of the trim.
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Using a hammer
Driving trim nails with a hammer requires precision and a deft hand. It is recommended to use a smooth-faced hammer to avoid marking the wood. A hammer with a curved claw is also preferable, as it is less likely to cause accidental damage.
When driving the nail, the head of the hammer must hit the head of the nail squarely, with the hammer's centre contacting the nail head. The nail should be driven with authority, but not with full hammer blows. Depending on the size and length of the nail, 4 to 6 inches of hammer travel may be enough to generate sufficient force. With each strike, the nail should move about one-quarter inch. Remember to avoid letting the hammer touch the wood to prevent denting.
Stop hammering when the top of the nail head is approximately 1/4 to 3/8 of an inch from the wood surface. At this point, you can use a nail set to countersink the nail. A nail set is a steel tool with a square or round surface that matches the size of the nail head. Place the nail set in the centre of the nail head and tap it gently with the hammer. The nail may move only 1/16th of an inch with each strike, but precision is more important than power in this step. Ensure the nail set is aligned with the nail to avoid creating new holes in the wood.
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Using a nail set
To use a nail set, hold it with one hand and a hammer in the other. The head of the hammer needs to hit the head of the finish nail squarely, and the hammer must be swung so that the head of the nail contacts the centre of the hammer. Drive the nail with authority, but not with full hammer blows. Depending on the size and length of the finish nail, you may only need 4 to 6 inches of hammer travel to develop enough force to drive the nail.
Make sure that the nail set is lined up directly with the nail. If it isn't, the nail set may jump off the head of the nail and create a new hole in the side of the finish nail. This is unacceptable if the wood will be stained. If the wood will be painted, you can fill the extra hole with a spackling compound.
The trick is to drive the finish nail so the top of its head is about 1/16th of an inch below the surface of the finished wood. This is not as easy as it sounds and is harder with larger finish nails as they offer more resistance. If you've never done this before, you should practice using scrap finish lumber.
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Avoiding blowout
To avoid nail blowout, you can use a trim nailer, which drives nails instantly, without the repeated blows that can cause cracks. A nail gun can also be used, but it may not be suitable for delicate trim work, as it can damage the trim or wall surface. It can also be prohibited in certain areas due to noise or safety regulations.
If you are using a nail gun, turning the nail gun 90 degrees, or perpendicular to the face frame orientation, will significantly reduce the chances of a blowout. This is because pneumatically driven nails will generally blow out in only two out of four directions. The longer and thinner the nail, the more variation in this, as the nails are able to twist more.
If you are not using a nail gun, you can pre-drill holes in the trim pieces before hammering to avoid splitting the wood. This will make it easier to install and ensure a clean finish. Use a nail set to keep the big blunt part of the hammer away from the trim once the nail is started. You can also use a hammer and punch, but this can be more difficult in tight corners.
When choosing a nail, use the smallest diameter nail that will do the job. A larger diameter nail will exert more force on the wood's grain, making the wood more likely to split. Blunt the point of the nail with a hammer, so that it cuts its way through the wood grain, rather than wedging a pathway. You can also lubricate the nail with petroleum jelly to reduce friction and decrease the probability of the wood splitting.
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Using construction adhesive
Construction adhesives are an alternative to nails when installing trim. They are particularly useful when you cannot see the stud location. Adhesives provide exceptional holding power, creating a permanent bond between the trim and the wall surface. Modern polyurethane and latex-based adhesives are flexible while maintaining strength, accommodating natural wood expansion and contraction.
For maximum effectiveness, choose an adhesive specifically formulated for trim applications, which provides initial grab strength and develops full bond strength within 24 hours. It is important to ensure the adhesive is rated for the type of trim you are installing, as well as the surface you are installing it on. For example, some adhesives are better for wood-to-wood adhesion, while others are designed for wood-to-plaster or wood-to-PVC adhesion.
Adhesive-only applications are best for lightweight decorative elements like thin crown moulding or chair rails on smooth, clean surfaces. This method requires temporary bracing during curing and eliminates visible fastener holes. For most trim installations, a combination of adhesive and nails delivers superior results. Apply construction adhesive in a zigzag pattern, then secure with nails.
When using construction adhesive, cut and dry-fit trim pieces prior to applying the adhesive. For smaller trim, run a 1/4-inch continuous line (bead) along the back of the trim. For trim larger than 2 inches in width, run a 1/4-inch serpentine bead (S-bead) of construction adhesive about 1 1/2 inches from both edges of the trim. Push the piece into place and hold for 5-10 seconds. Allow the adhesive to dry or cure for at least 2 hours before painting, or 24 hours for the best results.
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Frequently asked questions
A trim nailer gun is a good tool to use when driving trim nails. It is instant and does not require repeated blows, which can cause cracks. A gas-powered impulse nail driver is another option.
Using a trim nailer gun can help to avoid causing cracks. Hammering nails through old plaster walls can cause cracks, but a trim nailer gun drives nails instantly without repeated blows.
"Blowout" can be caused by careless aim, but sometimes the nail turns inside the wood and pops out. To fix this, grab a hammer and try to drive the nail up so you can grab the head with pliers and pull it out.
