Treated Lumber For Boathouses: Decking Material Choice

If you're considering using above-ground treated lumber for your boathouse decking, it's important to understand the pros and cons of this material. Above-ground treated lumber is a type of wood that has been processed with high pressure to force a solution of water and preservatives deep into the wood, helping to extend its lifespan. This treatment protects the wood from termites, rot, and fungal decay, making it ideal for outdoor structures like decks and fences. However, it's important to note that above-ground treated lumber has specific limitations on its use. It can only be used for applications that are more than 6 inches from the ground and must have proper ventilation and drainage.

When it comes to boathouse decking, the choice of material is crucial as it is constantly exposed to harsh conditions, including waves and saturation with water. Constant moisture can accelerate rot and decay, and lead to mould and mildew issues. While above-ground treated lumber can provide some protection, it may not be sufficient for the demanding environment of a boathouse. Therefore, it's essential to carefully consider the benefits and drawbacks of this material before making a decision.

Pros and cons of using pressure-treated pine for boat house decking

Pressure-treated pine is a commonly used material for boat docks, especially for those on a budget. Here are some pros and cons to consider when deciding whether to use pressure-treated pine for your boathouse decking:

Pros:

• Cost-effective: Pressure-treated pine is the most affordable option for decking, with a price range of $15-$20 per square foot for installation, substructure, and decking.
• Durable: With proper maintenance, pressure-treated pine can last 20 years or more.
• Resistant to rot and insects: The treatment process involves infusing the wood with chemicals that increase its resistance to rot and insect damage.

Cons:

• High maintenance: Pressure-treated pine requires annual or biennial sealing to prevent water saturation and subsequent rot and decay. Regular maintenance costs can add up over time.
• Susceptible to splintering: Pressure-treated pine is known to splinter over time, which can be uncomfortable and even dangerous for bare feet.
• Environmental concerns: The chemicals used to treat the wood are harmful to the environment, which may be a significant concern for eco-conscious boathouse owners.
• Discoloration: Exposure to sunlight can cause the surface of the wood to turn grey through a process called photo-oxidation. While this process can be slowed by staining or painting, it does require additional upkeep.
• Prone to cracking: Freeze-thaw cycles during seasonal changes can cause the wood to expand and contract, leading to cracks and splits.

How to maintain a wood deck

Above-ground pressure-treated wood is a good option for boathouse decking as it is more affordable than composite or vinyl-based boards, and can be cut into any shape and stained any colour. However, it does need to be refinished every two to three years and is susceptible to rotting and warping.

To maintain a wooden deck, regular inspections and annual cleanings are necessary. Here is a step-by-step guide:

Regularly Inspect the Deck

Inspect the deck for rot and structural integrity. Summer is a good time for this, as the air is warm and dry. Check the ledger board where it meets the house and the stairs where they contact the ground. Wiggle or apply weight to the railings to ensure tight connections. Replace any raised or exposed nails with wood screws and fill holes with exterior wood filler. Keep the deck swept, especially in autumn when leaves are falling.

Replace Damaged Deck Boards

Use a claw hammer to remove damaged boards. Cut a replacement board to fit, using the same type of wood, and stain or coat it to match the others. Install the new board with a power drill and screw drill bit. If multiple boards need replacing, consider replacing them all at once for a fresh, uniform appearance.

Annual Cleaning

Clear any furniture, toys, and potted plants from the deck. Use a putty knife to remove debris from between the boards. Spray a biodegradable outdoor cleaner that removes mildew onto the deck. Scrub with a stiff-bristle brush and an extension handle if needed. Rinse the deck with a garden hose. Alternatively, use a pressure washer on a low setting with a fan spray nozzle.

Prepare to Stain or Seal the Deck

If the deck has never been stained or sealed, or needs a new coat, use a stain or sealant to protect it from the elements. Allow a new deck to weather for 60-90 days before staining. Conduct a water drop test: if the water is absorbed, the deck needs sealing. If it beads, the deck only needs cleaning. Cover nearby plants with plastic sheeting and apply painter's tape where the deck meets the house. Remove loose paint or stain with a paint scraper or stiff brush. Sand the surface with an orbital sander to improve absorption and create a smoother finish. Vacuum the deck thoroughly.

Apply the Wood Stain or Sealant

Let the deck dry for at least two days, then begin by applying the stain or sealant to the handrails with a paintbrush or sprayer, working from the top down. Use a natural-bristle brush for oil-based products and synthetic bristles for water-based stains. Stain or seal the decking boards with a roller and extension pole, then back-brush with a stain brush. Alternatively, use a flat pad applicator. Let the stain soak according to the instructions, then remove any excess with a rag. Allow the deck to dry completely (at least 24 hours) before use.

Maintenance Tips

Rearrange outdoor furniture periodically to prevent mismatched colour patches and water gathering beneath them. Avoid using rugs or mats made of natural materials, as these can trap moisture. Trim nearby bushes and trees to at least 12 inches from the deck to prevent moss, mould, and rot. If you find warped or raised boards, smooth them with an orbital sander.

Best wood decking for above-ground pools

If you're looking to build a deck for your above-ground pool, there are a few options to consider. The best material for you will depend on your style, budget, and availability. Here are some of the most common choices for above-ground pool decking:

Pressure-Treated Wood

Pressure-treated wood is a popular and affordable option for pool decking. This type of wood has been treated with chemical preservatives to resist rot, decay, mould, mildew, and insect damage. It is important to note that pressure-treated wood requires consistent maintenance to ensure its longevity. On average, a pressure-treated pine pool deck can last between 15 to 20 years, but this will depend on the level of care and the local climate. Pressure-treated wood is also susceptible to warping, splintering, and thermal expansion and contraction.

Cedar

Cedar is another softwood option that offers some natural resistance to rot and decay. Cedar decking requires yearly maintenance, including the application of a waterproofing sealer, to ensure its longevity. With proper care, a cedar deck can last up to 20-25 years.

Composite and PVC

Composite decking is made from a blend of wood fibres and plastic, combining the strength of wood with the durability of plastic. It is a low-maintenance option that is resistant to water, warping, insects, and splintering. However, composite decking may be slippery when wet and can be extremely hot to walk on barefoot. It is important to read the manufacturer's instructions and have realistic expectations regarding maintenance.

Hardwood

Hardwood decking, such as Ipe, is made from some of the hardest and most durable woods available. Hardwood decking is naturally resistant to rot, decay, mould, mildew, splintering, and flame spread. It is also slip-resistant and comfortable to walk on barefoot. Hardwood decking requires minimal maintenance, such as occasional cleaning and oiling to maintain its colour and enhance its natural grain.

When choosing the best decking material for your above-ground pool, it is important to consider the specific conditions it will be exposed to, as well as your desired level of maintenance. Each option has its own unique advantages and disadvantages, so be sure to weigh your priorities before making a decision.

The different classifications of treated lumber

Above-ground treated lumber is good for boathouse decking, but it is important to note that it should be used for applications more than 6 inches from the ground and only when the wood has proper ventilation and drainage.

Now, here is an overview of the different classifications of treated lumber:

The American Wood Protection Association (AWPA) sets the standards for treated wood and has developed the AWPA Use Category System, which categorises treated wood types based on their applications and performance in different settings.

ACQ-Treated Wood

Alkaline Copper Quaternary (ACQ)-treated wood is a popular choice for construction. It is made by infusing wood with copper and preservatives, making it durable and resistant to rot, decay, and insects. It is commonly used for outdoor applications such as decking, fencing, and landscaping.

CCA-Treated Wood

Chromated Copper Arsenate (CCA)-treated wood is another popular option, known for its durability. It uses chromium, copper, and arsenic to protect the wood from the elements and is ideal for outdoor projects requiring high resistance. Due to regulations, CCA is only permitted for water-based, commercial, and specific residential projects, such as structural applications and poles.

MCA-Treated Wood

Micronized Copper Azole (MCA)-treated wood is a newer option that has gained popularity. It uses micronized copper particles and preservatives, resulting in a natural appearance and high resistance to decay, rot, and insects. MCA-treated wood is often used for above-ground applications, including decks and fences.

CA-Treated Wood

Copper Azole (CA)-treated wood is commonly used in construction due to its resistance to rot, decay, and insects. Like MCA-treated wood, it is ideal for outdoor uses such as decking, fencing, and landscaping.

Creosote-Treated Wood

Creosote-treated wood is made using creosote oil, a coal-based product. It is highly durable and resistant to rot, decay, and insects, making it suitable for outdoor uses like railroad ties and utility poles. However, its use has become less common due to skin irritation and messiness, along with advancements in treatment technology.

Borate-Treated Wood

Borate-treated wood uses naturally occurring minerals called borates to protect against rot, decay, and insects. This type of treated wood is often used for interior applications, including framing, flooring, and panelling.

Fire-Retardant Treated Wood

This type of wood is treated with chemicals that slow the spread of fire, making it ideal for construction where fire safety is a priority, such as commercial and residential buildings. Fire-retardant treated wood is available in various forms, including lumber, plywood, and timber.

Modified Wood

Modified wood is treated at the molecular level to enhance its durability and resistance to outdoor elements. It is commonly used for high-end outdoor applications, such as decking and landscaping.

These classifications ensure the proper use of treated lumber, maximising its benefits and minimising potential issues. It is important to select the right type of treated wood for specific projects to ensure durability and compliance with local building codes.

The best types of wood for a deck

When choosing the type of wood for your deck, it's important to consider factors such as durability, cost, maintenance requirements, and the climate in your region. Here are some of the best options for decking wood, each with its own unique advantages and drawbacks:

Pressure-Treated Wood

Pressure-treated wood is one of the most popular choices for decking due to its affordability and rot resistance. It is created by forcing a solution of water and preservative agents into the lumber under high pressure, extending its lifespan and protecting it from termites, rot, and fungal decay. However, pressure-treated wood requires routine maintenance as it is susceptible to warping, cracking, and splitting. It also needs to be refinished every two to three years.

Cedar

Cedar is a softwood that is prized for its natural beauty and durability. It is weather-resistant and can resist rot and insect infestation better than most other types of wood. Cedar is also less prone to warping and cracking, and it adjusts its moisture content to match the surrounding atmosphere, making it ideal for areas prone to freezing. On average, cedar decks can last up to 15-20 years with proper care, which includes yearly pressure washing and refinishing or staining every two to three years.

Redwood

Redwood is another western softwood that is similar to cedar in terms of durability and resistance to moisture, rot, and insects. Its natural beauty comes from the presence of natural oils and tannins. Redwood decks require similar care to cedar, including annual pressure washing and staining every couple of years to preserve their natural look. While redwood is generally more expensive than pressure-treated wood, it is more affordable on the west coast of the United States.

Tropical Hardwoods (Ipe, Teak, Mahogany)

Tropical hardwoods such as Ipe, teak, and mahogany are extremely durable and resistant to moisture, insects, and warping. However, they are significantly more expensive than pressure-treated lumber. These woods require pilot holes for nailing or screwing, which increases the labour cost. Additionally, tropical hardwoods can be challenging to find at local lumber yards, and the cost of shipping further adds to the overall price.

Composite Decking

Composite decking is made from wood fibres and recycled plastics, offering extreme durability and low maintenance. It does not require staining or regular cleaning like natural wood. However, it lacks the natural look and charm of real wood, and it can be slippery in the rain and get extremely hot in the sun. Composite decking is a more expensive option compared to natural wood choices.

Kebony

Kebony is an engineered wood product made from pine. It is treated and heated to seal the wood, resulting in a product that can last up to 25 years with minimal maintenance. Kebony can be stained with an oil-based finish or allowed to fade to a natural silver colour.

Black Locust

Black Locust is a sustainable decking option that provides a natural wood look with added durability. It is assumed to be priced similarly to hardwood decking options.

In summary, the best type of wood for your deck depends on your specific needs, budget, and local environmental conditions. Consider the advantages and drawbacks of each option before making your decision.

Frequently asked questions