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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


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Everything you need to know about cork decks

March 28, 2025
Everything you need to know about cork decks As the industry and yacht owners move towards sustainable decking options, we have recently begun working with cork. This decision has been driven by the increasing demand from environmentally conscious customers . As more people prioritize eco-friendly choices in their purchases, cork has emerged as an ideal decking material. Known for its sustainability and numerous environmental benefits, cork offers unique characteristics that not only provide practical advantages but also contribute to a reduced environmental footprint . This makes cork a compelling choice for those looking to make greener decisions. TDS is a distributor for Navicork by Amorim , the world leader in the cork industry , which is leading the marine revolution with cork decks that champion sustainability. With more than 150 years of history, Amorim has made an unparalleled investment in research, innovation, and design, developing a portfolio of products and solutions that set the standard for environmentally responsible decking . Why is cork so environmentally friendly? UNESCO recognizes cork oak forests as one of the 36 most crucial ecosystems globally, highlighting their environmental significance. Cork is one of the most sustainable resources in the world and remains the only truly carbon-negative product on the market. Eco-Friendly & Carbon-Negative One tonne of cork absorbs about two tonnes of CO₂ while producing only 1.6 tonnes during processing. Harvesting cork does not require felling the tree , allowing forests to continue absorbing carbon dioxide. The bark regenerates , ensuring a sustainable and renewable material for generations to come. Lightweight and Durable Cork is significantly lighter than traditional decking materials, 2 to 5 times lighter than teak, reducing overall vessel weight and fuel efficiency. It is highly resistant to wear and tear , making it suitable for high-traffic marine applications. Superior Thermal and Acoustic Insulation Low thermal conductivity (0.065 W/mºK) minimizes condensation, reduces energy loss and keeps decks cool underfoot. The closed-cell structure of cork dampens structural noise , reducing onboard sound levels and acoustic performance. Comfort & Safety Cork’s soft, velvety texture provides superior underfoot comfort , reducing fatigue during long periods on deck. Its natural non-slip properties enhance safety, making it an excellent choice for marine environments. It’s splinter-free and reduces impact injuries compared to traditional hardwood decks. Design Flexibility & Aesthetic Appeal Available in various textures, colors, and patterns, cork decking can be customized to match the design vision of any vessel. Offers a unique aesthetic while still delivering the premium look and feel desired. For more information check our cork decking section

What to expect from TDS when you order a deck

March 11, 2025
What to expect from TDS when you order a deck Once you have decided to order your new deck from us, we have a process in place to ensure that the whole manufacturing and installation goes as smoothly as possible. With a commitment to transparency and customer satisfaction, we have put together some guidelines outlining the most important key steps from the moment that you commit to a new deck from us. 1. Customer Inquiry, Quotation Process and Formal Quote When we are first contacted by a customer, we ask that they send us photos and a layout of the boat via our contact page on our website so that we can understand their specific requirements. Our team then conducts its own research by reviewing the layout and photos provided, as well as gathering information about your boat. Based on this information, we develop a budgetary quote, and if the customer is satisfied with it, we provide a formal quote. The formal quote outlines all the essential details, including design specifications, materials, price and timelines. It is crucial that you read through this document carefully. Taking the time to review it not only helps you understand what to expect but also gives you an opportunity to ask questions or clarify any uncertainties before signing. Once the quote is acceepted, we issue a pro forma invoice for the templating/digitizing, after which we will organize a date to digitize the deck. Once we have the digital file, our sales and project management teams meet to review both the quote and the digitized layout to ensure that the quoted square footage is accurate. Should there be any discrepancies, we adjust the quote accordingly and will call you to explain the changes. 2. Securing Your Order with a Deposit After both parties agree on the final numbers, we send an order confirmation for your signature and will then send an invoice for 50% of the materials cost and the cost of digitization so that we can begin building the deck. Once the funds are received, we start production, later invoicing for the remaining 50%. Travel costs associated with the digitization are invoiced separately after the activity has concluded. 3. Project Management and Timeline Confirmation We will assigns a dedicated Project Manager to your deck, and they will be your primary point of contact throughout the entire process. Your Project Manager is responsible for confirming the production and installation timeline and ensuring that every phase of the project is scheduled appropriately. They will communicate any updates, answer your questions, and address any concerns that may arise during production. 4. Final Payment and Scheduling Shipment Before the deck is shipped and installed, we require that the full remaining balance is settled and we can then schedule shipment and installation without any delays. 5. Installation You will have received an estimated quote for installation. Once the deck is installed we ask the captain or project manager to walk the deck with our team and get a sign off and release for the deck and then we invoice them for the final amount along with any associated travel, travel time, accommodation and subsistence. We will invoice you the final amount once the installation has been done.

Choosing the right wood for your deck: What are your options?

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.
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