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Garapa Smooth Hardwood Decking 21 x 145mm

Price From: (exc VAT) £10.11 (inc VAT) £12.13

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Garapa is a beautiful South American hardwood with a fine texture and rich golden brown tones. This extremely resilient wood species is ideally suited for use as exterior decking – it has a beautiful lustrous appearance and boasts excellent performance characteristics.

At a glance

  • 15% off
  • Rich golden brown tones
  • Kiln dried for optimal dimensional stability
  • Smooth all round with eased edges
  • Accepts finish very well
  • Ideal for commercial and residential use
  • Silva Recommended Finish - Sansin Dec
    Garapa looks best in one of these colour tones...
    Camel | Autumn Gold

Lustrous golden brown appearance combined with excellent performance characteristics

Silva’s Garapa decking offers excellent durability, good dimensional stability, and a beautiful golden brown appearance. This tropical hardwood is hard, heavy, tough and strong, making it an excellent choice for timber decks in both residential and commercial settings.


Garapa is a lustrous wood with a fine uniform texture. The grain is straight to interlocked (roey) and occasionally slightly interlocked. Garapa is fairly consistent in appearance with golden brown being the predominant colour tone.

Silva’s Garapa decking has a surface that is almost entirely free of knots and other natural defects. The growing region from which Silva’s Garapa is harvested produces large trees with substantial boles that yield a high volume of exceptional quality clear grade (knot free) timber. This means that Silva’s Garapa decking is of the highest standard available and well suited to high end decking projects that require a clean contemporary appearance.

Strength and Durability

According to TRADA (Timber Research and Development Association) Garapa is a ‘hard, heavy, tough and strong timber’. This wood species is naturally resistant to decay and has been awarded a Class 2 durability rating according to BS EN 350-2 (Class 1 is the most durable and Class 5 the least durable).

Density and Hardness

At a moisture content of 18% Garapa has a density of approximately 875kg/m3. The high density of this wood species makes it resistant to damage from impact and abrasion. It is therefore well suited for decks in high traffic areas such as hotels, restaurants and any outdoor public spaces.

Garapa’s dense cell structure contributes to its natural ability to resist attack from insects, decay, and moulds. Garapa has a Janka hardness rating of 1700.

Dimensional Stability

Garapa is described by TRADA as a ‘moderately stable’ wood species. Silva’s Garapa decking is kiln dried to a moisture content of 16 – 18% to optimise dimensional stability.

By properly kiln drying at source in state-of-the art European kilns our supplier can ensure that the raw material will dry uniformly to the desired moisture content. In addition to enhancing its dimensional stability, the controlled removal of moisture also enables the material to be machined to a superior and consistent finish, ensuring that the product is well presented when it arrives on site.

Storage and Handling 

For best results store your Garapa decking out of direct sunlight and do not expose it to weather before installation. Keep the boards off the ground by stacking them flat on battens; this allows air to circulate around the stack. Cover your deck boards with a waterproof breathable sheet to protect them from sun and rain.

Cleaning and Maintenance 

Your Garapa decking will benefit from regular cleaning. Brush the deck with a stiff broom to remove dirt and dead leaves, and ensure that the gaps between the boards are clear of organic debris. Clean the deck periodically with Multi Wash by Sansin to remove grime and mildew. Garapa decking can be pressure washed, but it is important to select a low setting to prevent the wood fibres on the surface from being damaged.

If your deck is weathered it is possible to restore the natural colour with Wood Cleaner by Sansin®.  This product will remove weathering, mould, algae, mildew and iron stains and prepares the surface for recoating. 

If an existing finish or stain has broken down it can be removed using Paint and Stain Remover by Sansin®.  This product will remove most failed oil-based or latex finishes, extreme weathering, water stains, mould and mildew and restore wood to its natural colour.


Garapa decking can be easily crosscut with good quality chop saw using a carbide-tipped blade. Ripping can be done on a standard table saw, using a good quality, well-aligned fence and a carbide-tipped blade. When drilling, always use the highest quality drill bits available. If screwing through the face, use a countersink bit with a positive stop to ensure that all the screw heads end up at a consistent depth. Screws can be lubricated to make installation easier.

Routing or planing can be done with either high speed steel or carbide cutters. The feed speed should be fairly slow. For best results we recommend that the boards are sanded prior to finishing.


A dust mask and eye protection should always be worn when working with any wood. Avoid the inhalation of wood dust. We recommend a dust mask with an activated carbon filter. Some people may have an allergic reaction to hardwood dust. Remove wood splinters immediately to prevent infection.


To ensure its quality, Garapa decking from Silva is carefully manufactured, graded and inspected at source. It is inspected again during the order picking process prior to despatch. However, Garapa decking is a natural wood product and is subject to variations in weight, density, colour, grain and performance. Garapa decking is subject to dimensional changes as the moisture content in the wood fluctuates with humidity in the air. Swelling, shrinkage, checking, and other movement of individual pieces are normal occurrences in wood decking.

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Coverage - 1m2 = 6.67 metres of board
Density - 830kg/m3
Hardness - 1,700lbf
Botanical name - Apuleia leiocarpa
Origin - Boliva
Wood Type - Tropical Hardwood

Recommended fasteners: 5.0 x 60mm Countersunk Stainless Steel

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Finishing & Protection

Even though Garapa is highly durable in its natural state we recommend that decking be finished on all four sides prior to installation to help prevent surface checking, discolouration and cupping.

Why Pre-finish?

  • Enhances the natural beauty of wood
  • Ensures a consistent finish
  • Applied in factory conditions
  • Long lasting protection against weathering
  • Simple maintenance routine
  • Reduces onsite labour costs

The importance of sanding

As Garapa is dense species it is essential to sand the deck boards prior to applying the finish. Sanding opens up the cells on the surface to allow the stain to properly penetrate. This facilitates deeper penetration of the stain for a consistent appearance and longer service life.

What is weathering?

There is a risk involved when leaving wood exposed to the elements. During the weathering process wood can appear unsightly as the material can blacken due to moisture getting into the fibres and pulling out tannins and extractives. Finish protects the wood from moisture absorption and UV degradation.

Installation & Advice


Kiln died Garapa decking does not need acclimatising; it can be installed immediately upon delivery to site.

Deck Board Spans

21 x 145mm Garapa decking should be installed with joists spaced at 400mm centres. When installing the boards diagonally the joists should be spaced at 300mm centres.

Deck Board Spacing

21 x 145mm kiln dried Garapa deck boards should be installed with a 6mm gap between the boards. The space between the boards allows for air circulation and expansion.


It is important that air is able to circulate underneath the deck to prevent cupping and warping of the boards. It is recommended that a vapour barrier is used to prevent moisture from absorbing into the underside of the deck boards.


There are a number of different options available for fastening deck boards to the joists. We recommend screwing through the face of every board using 5.0 x 60mm Countersunk Stainless Steel Screws. Fix two screws into every joist at quarter points on the deck board (36mm from each edge). Although it is possible to install the5.0 x 60mm Countersunk Stainless Steel Screws without pre-drilling, we recommend that pilot holes are drilled. This is particularly important at the ends of the boards to prevent splitting.

For a cleaner finish we suggest recessing the screws and using Garapa plugs to hide the screw heads. Plugs can be cut from off-cuts of decking using a relatively inexpensive drill attachment called a plug cutter.

Hidden Fasteners

There are a number of hidden fastening systems available. None of these products are as reliable as screwing through the face, and it is likely that there will be some additional movement of the deck boards when using hidden fasteners. If using a hidden fastening system it is essential to allow adequate ventilation beneath the deck and to finish the deck boards with an appropriate sealer on all sides prior to installation.

End Sealer

Garapa decking from Silva Timber is end-sealed during the manufacturing process to help prevent splitting and checking on the ends of boards. We recommend that if the boards are cut during installation then the exposed end grain should be sealed as soon as possible. A clear, water-resistant wax such as Osmo Wax End Sealer should be used.


We recommend that Garapa decking be finished on all four sides prior to installation to help prevent surface checking, discolouration and cupping. In dry sunny conditions, it is especially important to finish the deck boards prior to exposure to the weather. Finishing the underside of your decking will inhibit moisture from absorbing into the wood and thus reduce the potential for cupping.

To maintain the natural look of the wood we recommend using a high quality penetrating oil with a UV inhibitor such as Dec by Sansin.

If a natural weathered appearance is preferred we recommend applying Sioo which protects the wood whilst allowing it to gradually season and weather over time.

Apply the finish according to the manufacturer’s instructions.

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