logo

How to Inspect Teak Deck Caulking & Seams

Teak deck caulking and seam condition is a critical indicator of a boat deck’s quality. Inspecting the caulking and seams can determine the overall deck condition, teak deck thickness, and remaining life of the deck.


MISSING OR DETACHED CAULKING



On a dry deck, examine the seams between the planks to look for missing or detached caulking. If no caulk seam failures are visible, wet the boat deck. As the deck dries, look for areas along the edges of the caulk seams that stay wet longer than the surrounding teak. This is where caulk failures may exist.


Detached Caulking – Allows Water Penetration

VARYING SEAM WIDTH


For quality teak decking caulking, the width of caulk seams will not vary along the length of the seam. If the seam widths vary, the deck was either poorly laid, or the seams have been re-cut and re-seamed. A boat deck in this condition may be in the last third of its life.

CAULKING CONDITION

Cracked or hard caulk cannot flex as the teak expands and contracts. This may result in leaks. The only solution is to remove the old caulk and re-caulk the seams if there is enough seam depth available.


Cracked Caulk – Allows Water Penetration

TEAK CONDITION

Where caulking is visibly separated from the teak or missing, look at the edges of the teak where the caulking should be bonded. If the teak edges of the seams are very thin relative to the width of the seam, there is no longer enough bonding surface for new caulking to stay attached. 

If the teak surface is ridged, it will need to be sanded. It is possible the sanding will reduce the thickness so there may not be enough viable edging for re-caulking. 


Extreme Ridged Surface of a Teak Deck

DETERMINING TEAK THICKNESS

When inspecting teak thickness, be aware that it will not be the same everywhere. Typically, bows, sun decks, uncovered aft decks, and swim platforms wear faster due to more sun, sea, and human activity. 

HATCHES

The deck’s current thickness often can be determined by simply opening hatches and looking at the edges of the hatches and the deck surrounding the hatch.

MEASURE CAULK SEAM DEPTH

A slightly more invasive measuring procedure is to (1) slide the tip of a penknife or ice pick into a caulking seam until it bottoms out, (2) mark the deck surface with your thumbnail, and (3) withdraw the pen or pick to see the depth. 

RABBETED DECKS – CAUTION NEEDED TO MEASURE

In traditionally laid teak decks, one or both edges of the planks can be rabbeted. A rabbet is a notch, usually square, cut into the edge of a board. Rabbets create the space for the caulking while leaving the bottom of the plank full width to serve as a spacer for the caulk seam. 

When using the penknife or ice pick procedure to check the thickness of a traditionally laid teak deck, it is necessary to know where the edges of the two planks meet under the caulking – in the center or along one edge of the seam. This enables proper placement of the blade or a pick to reach the bottom of the deck, between the planks.

If there is sufficient teak thickness in a rabbeted deck, the existing caulk seams can be cut deeper to create the proper bonding surfaces and then be re-caulked, thereby saving the deck for several more years. Sometimes, the downside is that the process of cutting the seams deeper is not as accurate as of the original machining of the wood. As a result, once caulked and sanded, the seams will vary slightly in width and not be as crisp as the original ones.


Source: “Proper Seam Composition” by Teakdecking Systems (Rabbeted Deck on left)

Read more…Teakdecking Systems 16-pp Guide on How to Properly Caulk Seams


COST OF RESEAMING VS. NEW TEAK DECK

The cost to reseam a teak deck is lower than buying a new teak deck. Often, it is one-third to one-half the cost of a new teak deck.

BEST TIPS FOR EXTENDING DECK’S LIFE

Hopefully, the inspection of teak deck caulking will reveal little more than the need for some love and attention. To extend the deck’s life and push off the eventual replacement as long as possible, it is imperative to keep the deck fully sealed from water intrusion. Trapped water under the deck planks can cause deck delamination from beneath. It can also leak into the structural sub-deck (and possibly interior) through hardware fastener holes. For these reasons, it is important to replace any missing bungs and reseal any caulk seams with damage. If the deck cannot be properly sealed after these steps, a deck replacement is necessary.

A careful survey of a teak decking (and caulk and seams) by an expert can provide the best information about teak decking condition. This can help to determine if a deck should be repaired or replaced.

Want to know how to recaulk seams? Read this article: How to Recaulk Seams

Additional Questions?

Call 941- 756 0600

Email customerservice@teakdecking.com


ALL PRODUCTS

February 20, 2025
The yachting community has long held the belief that viable teak must come from very old, natural forests, with much of the industry still adhering to the notion that teak must be 100 years old. Despite the environmental and humanitarian controversy surrounding teak, many owners worldwide continue to request it. This guide explores the different wood materials currently available , helping industry stakeholders and owners to make informed decisions about the best option for their deck . The information is divided into two sections titled "Wood we work with" and "Wood we do not work with." It is intended solely for educational purposes, providing detailed information on the characteristics, merits and concerns of each type. As a leading deck builder and installer, TDS remains completely impartial with no vested interest in any of the products discussed in this guide. MYANMAR TEAK The importation of Myanmar teak into Europe has been illegal since 2013 under the European Union Timber Regulation (EUTR), which aims to prevent the sale of illegally harvested timber. In 2021, additional sanctions were introduced that further restricted its availability, extending the ban to the USA as part of broader efforts to curb deforestation and human rights violations linked to the Myanmar timber trade. That same year, the Council of the European Union imposed targeted sanctions on Myanmar’s military regime, specifically restricting its ability to export timber that serve as key revenue sources for the junta. Despite these restrictions, Myanmar teak continues to be traded in countries that do not enforce such sanctions, including India, China, the UAE, Turkey, and Australia. Note, these restrictions may change at anytime. WOOD WE WORK WITH PLANTATION TEAK Characteristics Less dense than old-growth, natural teak. Younger trees aged between 30-50 years. Is resistant to insects and rot. Merits Despite the shorter and narrower planks, we can still get 20mm thickness and planks up to 2.2m. By using scarf joints or finger joints we can create 4m battens that are glued together. Shorter planks also reduce the purchase price. A guarantee that the forest is managed in an environmentally responsible and sustainable manner, including practices such as replanting trees, protecting biodiversity, and minimizing environmental impact. Verifies that the teak is sourced from legal and well-managed forests, reducing the risk of illegal logging, and complying with international law. The teak undergoes rigorous quality control measures, ensuring it meets certain standards for durability, strength, and appearance. Social Responsibility is at the heart of the activity, including fair labor practices and community engagement, supporting local communities, and ensuring workers' rights are respected. Plantations are managed with long-term sustainability in mind, ensuring a reliable and consistent supply of teak. Well-managed plantations, act as carbon sinks, helping to mitigate climate change by absorbing and storing carbon dioxide from the atmosphere. If properly maintained a deck will last 15-20 years. Concerns Some plantation teak is harvested too early for quality yacht decking. Less growth rings, resulting in lower grain quality. Less density that can give rise to warping and bowing. Pin knots are a consequence from pruning lower branches. Plantation managers, governments are reluctant to direct resources towards certification schemes. Where to source it? India, Indonesia, Tanzania, Benin, Brazil, Thailand, Sri Lanka, Costa Rica, Trinidad Note: there are other countries with younger 15-20 year teak. CERTIFIED GREEN TEAK Characteristics Uses parts of 30-40 year-old trees that would normally be rejected due to knots and imperfections. Sliced into thin veneers and glued together, to form a modified material with superior strength. Lengths up to 4m and allows large widths due to laminations Aesthetically attractive, with a plank like finish. Excellent durability as the laminating process enhances its stability and dimensional integrity. Is resistant to insects and rot. Merits The veneers are similar to the vertical grain of natural teak. Yield about 85% of the log vs 2-15% of log for Vertical Grain Renowned for its hardness, strength, and durability. A test panel currently on a yacht, had a 10kg scaffolding pole dropped onto it, causing only a 2mm dent. Limited susceptibility to cracking and warping, when cut and dried correctly. Non-skid surfaces. Extra insulation in hot and cold climates. A well-maintained deck should last 15-20 years. Concerns It may have variations in color and texture due to differences in the wood grain and moisture content of individual layers. Ensuring the quality and integrity of the bonding process is crucial, as poorly bonded laminations can lead to delamination, weakness, and structural issues over time. While lamination can improve the stability of green teak, the overall durability and longevity of green laminated teak may still be inferior to properly seasoned teak. It still requires careful moisture management to prevent swelling, shrinkage, or damage over time, especially in environments with fluctuating humidity levels. In some cases, the adhesives used in the lamination process contain chemicals. Where to source it? Thailand THERMALLY MODIFIED WOODS ACCOYA Characteristics Certified sustainable fast-growing softwood “Radiata Pine” is its base material. The wood is acetylated using acetic anhydride and water. It makes the wood virtually unable to absorb water, expand and rot. Merits Extremely durable, they guarantee it will last 50 years for use above ground and 25 years for use below ground. The wood can be reused, recycled, or burned as biomass (fuel). A great option for certain vessels such as catamarans. Very low maintenance. Concerns The color is different to what the industry “expects”. Its not as hard as teak, as it still has a lot of softwood. Where to source it? The Radiata Pine is harvested in New Zealand and shipped to the Netherlands for the modification process. TMT MARINE LIGHT Characteristics Significantly cooler than teak. Much lighter than teak. Similar abrasion resistance as natural teak. Merits Very dimensionally stable. Resistant to shrinking and swelling due to humidity, temperature, and moisture content. Resistant to decay and insects. Large logs that produce long, wide boards with tight, vertical grain. Can be used for interior applications, accepts stains and finishes. Fast-growing, sustainable species. Durable, slip resistant surface that is excellent for marine conditions. Concerns Much lighter in color, almost white before weathering. Soft wood that needs to be carefully sanded to remove scratch marks. Limited availability. Prone to splitting, chipping, and splintering requiring high quality tools and sharp blades when working. Where to source it? Western United States and Canada. WOOD WE DON'T WORK WITH THERMALLY MODIFIED WOODS AMERICAN HARD MAPLE Characteristics Specifically created for the marine industry Thermally modified by a controlled pyrolysis process of the wood being heated to (> 180 °C) in an oxygen free atmosphere. This process changes to the chemical structures of wood's cell wall components; lignin, cellulose and hemicellulose which increases its durability. Merits No chemicals are used during the modification process. It looks like teak. It weathers to grey in the same way as teak. Claims a zero-carbon footprint. Concerns Cracking. The color of thermally modified maple can vary depending on the specific treatment process and wood source, which may affect its suitability for certain design schemes. Where to source it? USA. TESUMO Characteristics Fast-growing African tree that matures in 50 years. Sourced from certified managed forests. Modified using heat, resin infusion and drying. Merits Developed as part of a research project conducted by Lürssen Shipyard and the German University of Göttingen.Can be disposed of by burning. Tested for years on land and at sea. Similar appearance, dimensional stability and rot resistance as teak. Concerns Limited amounts available. Where to source it? Germany. IROKO Characteristics African hardwood native to West Africa. Is resistant to rot and termites. Long, wide boards. Merits Similar color to teak. Economically priced. Concerns Extremely hard wood to work with: produces an enormous amount of fume and dust, prone to splintering and blunts work tools. Susceptible to cracking. Requires a lot of maintenance. A deck will last 5-6 years. Where to source it? West Africa. LEGAL DISCLAIMER This document is for informational purposes only and does not constitute professional, legal, or environmental advice. The information provided herein is based on publicly available industry knowledge at the time of publication and is subject to change due to evolving regulations, market conditions, and environmental considerations. TDS does not endorse, recommend, or assume responsibility for the sourcing, legality, sustainability, or quality of any wood materials mentioned in this guide. This guide is provided solely for educational purposes, with no commercial interest in promoting or favoring any specific wood type, supplier, or industry practice. The inclusion or omission of any material does not imply endorsement or disapproval of any specific supplier, manufacturer, or distributor. All information is presented without any warranty, express or implied, regarding accuracy, reliability, or completeness. TDS expressly disclaims any liability for direct, indirect, incidental, or consequential damages arising from reliance on the content of this guide. Readers are encouraged to conduct independent research, consult industry professionals, and verify compliance with applicable laws and regulations before making any decisions related to wood procurement or usage. By using this guide, readers acknowledge and agree that TDS is not responsible for any business decisions, financial outcomes, or disputes between suppliers, manufacturers, or buyers. Any reference to specific wood sources or countries is purely informational and does not imply any partnership, business relationship, or endorsement.
February 19, 2025
We are thrilled to announce our partnership with Matt Graham and Total Decking to expand our presence in key U.S. markets. This collaboration is focused on delivering high-quality decks to boats in the 20-150 foot range, in Maine, Newport/Southern New England, and Chesapeake. Matt Graham, owner of Total Decking, brings a wealth of experience to the partnership. With a background in both business and marine craftsmanship, Matt has worked in boatyards since the age of 14, later serving as Chief Operating Officer of Lyman-Morse Boatbuilding for eight years. A dedicated offshore sailor and skilled carpenter, Matt's experience ensures that Total Decking delivers top-tier deck installations tailored to TDS standards. Total Decking was originally founded by Larry Murray in 1987 to serve TDS clients in the New England market. Over the years, the company has completed hundreds of successful installations across a wide range of vessels from classic cruising yachts to modern race boats. Under Matt’s leadership, Total Decking has expanded its territory to Southern New England and the Chesapeake Bay region, recognizing strong growth opportunities in the area where he grew up. Partnering with TDS allows us to provide even better service and extend our reach into key maritime hubs," said Matt . "With our dedicated team, we aim to be the most efficient and highest-quality solution for TDS installations. We understand the challenges boat owners and builders face when it comes to decking, and we are committed to offering precision, durability, and the highest level of craftsmanship. Our focus is on long-term customer satisfaction, and we are excited to bring these high-quality decks to a wider market ." Total Decking currently operates with a five-person team, each member deeply rooted in the marine industry . Alongside Matt, key team members include Phil Huening, a 15-year veteran of TDS installations; Miles Mancini, a naval architect with a degree from Southampton University, Sam Lloyd, a seasoned marine professional and avid racer, and Rory Rowe, a skilled craftsman with a background in high end tiny home construction. Richard Strauss, CEO of TDS commented “We are excited to join forces with Matt Graham and Total Decking. Their expertise, and dedication, align perfectly with our mission to provide the best decking solutions in the industry. This collaboration will strengthen our ability to serve customers in these key markets and uphold the high standards TDS is known globally for. ”
January 30, 2025
When it comes to selecting a company for your new deck, transparency and trust are essential. While we at Teakdecking Systems believe in the superior quality and craftsmanship of our decks, we also understand that we are not the cheapest option. While cost is an important factor, it’s equally crucial to consider the long-term value and durability of your investment. If you decide not to entrust us with your new deck, we strongly encourage you to do your due diligence and ask the right questions before committing. Our top priority is ensuring you make an informed decision, no matter whom you choose to work with. A new deck is a significant investment and balancing cost with quality and durability is key to avoiding costly mistakes down the line. To help you navigate this process, here are six crucial considerations to guide your decision-making process: 1. Research the Company’s Reputation The first step in evaluating a decking company is to research its reputation. A quick online search can provide valuable insights into their track record through reviews, ratings, and testimonials from fellow yacht owners. Social media groups, forums, and word-of-mouth recommendations are also great sources of information. Pay close attention to any recurring themes in feedback—positive or negative—as they often reveal the company’s strengths or potential red flags. 2. Understand the Quality of the Teak Not all teak is created equal. High-quality, seasoned old-growth teak is far superior to plantation or fast-growing teak. Old-growth teak has tighter growth rings, which make it denser, less permeable, and significantly more durable. Plantation teak, while more readily available, lacks these qualities and may not hold up as well in the long term. Knowing what kind of material you’re putting on your yacht will ensure you make a well-informed investment. 3. Verify the Legality and Availability of Materials Legal sourcing of teak is not only an ethical concern but also impacts project timelines. Some companies may not stock the teak they use, instead purchasing it only when an order is placed. This could lead to delays, particularly if the company encounters sourcing challenges. Ensure the company you choose has legal teak readily available in their possession. This not only guarantees compliance with international laws but also reduces the likelihood of unforeseen delays in your project. 4. Compare Decking Materials While teak is a popular choice for yacht decking, there are alternatives like EVA foam, PVC, Polyurethane, and cork that you may consider. Each material has its own pros and cons in terms of cost, durability, and appearance. For instance, EVA foam is lightweight and budget-friendly but lacks the longevity of teak, while PVC and Polyurethane offer varying levels of durability and cost-effectiveness. Carefully evaluate these options and discuss them with the company to determine the best fit for your needs and budget. 5. Review Past Projects and Current Workloa d A company’s previous work speaks volumes about its capabilities and standards. Request to see examples of past projects, ideally ones similar to your vessel, to gauge their expertise. Additionally, inquire about their current workload. If a company is overbooked, your project could face delays, leaving your boat out of commission longer than expected. Asking for a clear manufacturing and installation timeline can help you set realistic expectations and plan accordingly. 6. Select a Reputable Yard Where the work is performed is just as important as who performs it. Opt for a reputable yard that has experience handling yacht projects. A good yard can coordinate with subcontractors, enabling multiple tasks to be completed simultaneously, which saves time and ensures a smoother process overall. Effective project management is crucial in these situations, so ensure the yard has a proven track record of handling yacht renovations. 7. Warranty & Service When evaluating decking companies, it is important to check if they offer a warranty and ask detailed questions about its coverage. Does it cover both materials and installation? What is the duration, and are there any conditions or exclusions? Clarify where warranty work will be carried out and any associated costs, such as transport, subsistence, lodging, and logistics required for repairs. 8. Global Service For yacht owners constantly on the move, choosing a company with reliable global support is essential. Evaluate the company's operational reach and its ability to respond and travel to your vessel if needed. For total peace of mind, TDS decks are covered by a worldwide warranty, ensuring customers receive top-tier service and support wherever they are. Final Thoughts Choosing the right company for your yacht’s decking is a decision that shouldn’t be taken lightly. Transparency, reputation, and quality should be your top priorities when evaluating potential companies. By asking the right questions and thoroughly researching your options, you avoid costly mistakes and ensure your deck meets your expectations in both quality and longevity. While cost is always a factor, remember that value is about more than just the upfront price, it’s about the durability, craftsmanship, and long-term performance of your deck. A well-informed decision will not only protect your investment but also enhance your enjoyment of your yacht for years to come.
ALL ARTICLES
Share by: