European Larch 145 x 21mm Smooth

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European Larch is a top choice for decking and cladding due to its fine grain structure and uniform coloring, providing a visually appealing and durable option. With a consistent pale pink or orange hue and regular knots, this timber is perfect for those who appreciate the beauty of natural materials. Its hygroscopic nature allows for natural shrinkage and expansion, enhancing the overall rustic charm of the decking.

Our delivery process is designed to be efficient and reliable, ensuring your softwood decking reaches you in excellent condition. Delivery charges are calculated based on your location, the size of the order, and the distance we need to travel. Whether we use trusted external couriers or our dedicated fleet of vehicles, we focus on careful handling of your materials. For detailed information, please visit our Delivery Terms & Conditions.

Softwood decking is versatile and straightforward to install, making it a popular choice for many projects. Depending on the product, installation methods may include traditional stainless-steel screws or secret fixings for a clean finish. Professional installation is recommended for the best results, but if you’re tackling the project yourself, we’re here to provide advice and detailed instructions. Reach out to our team for expert guidance.

Softwood decking is low-maintenance but benefits from regular care to extend its lifespan. Periodic cleaning and the application of a protective wood treatment or stain will help preserve its natural beauty and durability. For tailored advice on caring for your decking, don’t hesitate to contact us—we’re happy to help with any questions you might have.

Overview: Choosing the Right Installation Method

Softwood decking offers an affordable and attractive solution for outdoor living spaces. The installation method depends on your aesthetic preference—face screwing for maximum stability or hidden fastening for a seamless finish. Proper preparation and installation are essential to ensure longevity, weather resistance, and structural integrity.

Preparation and Acclimatisation

Before installation, allow the softwood boards to acclimatise on-site for at least 48 hours. Store them flat, off the ground, and protected from direct sunlight and moisture. Ensure the sub-frame is constructed from pressure-treated softwood joists with adequate ventilation beneath the deck to prevent moisture accumulation.

Fixing Methods

Face Screwing (Recommended)

The traditional and reliable method offering maximum stability. Screw directly through the face of each board into your sub-frame. Always pilot drill before fitting screws and drill holes 2mm oversize to allow for natural expansion. Use corrosion-resistant screws suitable for exterior softwood applications. Each screw hole can be plugged for improved aesthetics.

Hidden Fastening

The Deckwise hidden fastening system provides a seamless, contemporary finish without visible face screws. Each precision-engineered clip screws securely into your sub-frame and slots neatly into the side of adjoining boards, automatically providing consistent spacing. Pre-grooved boards are available, or use a biscuit jointer on site.

Installing Face Screwed Softwood Decking

Face screwing is the recommended method for softwood:

• Always pilot drill before fitting screws to prevent splitting
• Drill holes 2mm oversize to allow for natural expansion
• Maintain 6mm gaps between boards to accommodate seasonal movement
• Use 400mm centre-to-centre joist spacing for optimal support
• Screw holes can be plugged with matching softwood plugs for a neater finish

Installing Hidden Fastening System

For those seeking a clean, uninterrupted deck surface:

• Boards must be pre-grooved or grooved on-site using a biscuit jointer
• Each clip screws securely into the sub-frame and slots into the board edge
• Automatically maintains proper 4mm board spacing
• Creates a professional-grade, seamless finish

Ventilation and Drainage

All softwood decking installations require adequate ventilation:

• Maintain 400mm centre-to-centre joist spacing throughout
• Ensure adequate cross-ventilation beneath the deck to prevent moisture build-up
• Allow for proper drainage to extend the life of your decking

Professional Installation Tools

We strongly recommend using a hardwood decking wrench during installation. This self-locking deck board straightening tool allows you to hold bent boards perfectly straight while fasteners are installed, ensuring a professional finish every time.

Need Help?

While professional installation is advised for best results, we’re here to support DIYers with installation advice and technical guidance. Contact us for tailored support to suit your project.

Overview: European Larch Decking and Cladding

European larch is prized for its natural durability and beautiful warm colouration, combining the strength you need with the aesthetic appeal you desire. Popular for both decking and cladding applications, larch offers excellent value and performance. With proper maintenance, larch can last for decades, making it an excellent investment for your outdoor and exterior projects.

Natural Characteristics

European larch is moderately durable with good decay resistance. This hygroscopic timber naturally interacts with its environment, making it well-suited for exterior applications:

• High resin content provides natural protection against the elements
• Hygroscopic nature means timber absorbs moisture from air on rainy days
• Releases moisture when exposed to sun and wind
• Natural expansion and contraction during moisture cycles
• Characterful cracks and splits develop, adding authentic natural appearance
• Dense hardwood-like properties despite being a softwood
• Good structural strength for its weight

Weathering and Colour Changes

Understand how larch naturally ages over time:

• Without treatment, larch weathers from golden-brown tones to attractive silvery-grey patina
• UV rays and moisture exposure cause natural colour change over 6-18 months
• Weathered grey patina is considered distinguished and timeless by many
• North-facing surfaces and shaded areas may weather more slowly
• Initial colour variation between boards will gradually even out
• Natural ageing process does not affect structural integrity
• Many homeowners embrace the natural weathering aesthetic

Protective Treatments

If you prefer to preserve the original warm colouration of your larch, protective treatments are highly recommended:

UV Protection Oils

• High-quality semi-transparent stains and oils provide UV and water protection
• Penetrate wood to prevent growth of wood-decaying fungi
• Maintain warm golden-brown tones and prevent silver-grey weathering
• Reapply every 1-3 years depending on exposure

Clear Waterproofing

• Maintain natural appearance while offering moisture protection
• Allow wood to weather naturally while slowing the process
• Protect against water penetration and staining
• Reapply every 1-2 years

Pigmented Finishes

• Semi-transparent stains enhance natural beauty and grain
• Provide robust protection against UV rays and moisture
• Available in natural larch tones or custom colours
• Longer protection intervals of 3-5 years possible

Initial Treatment (Before or Immediately After Installation)

For best results, treat larch boards before or immediately after installation:

• Apply treatment to all surfaces including ends, edges, and backs
• Pay special attention to cut ends—seal immediately to prevent moisture ingress
• Choose treatments suitable for your specific application (decking or cladding)
• Allow adequate drying time before exposing to weather or foot traffic
• Treating before installation provides optimal protection
• High resin content means surface preparation is important for treatment adhesion

Regular Maintenance Schedule

Keep your European larch in prime condition with routine care:

Annual Inspection

• Check for debris accumulation between boards
• Inspect for signs of damage, splitting, or wear
• Ensure proper drainage and ventilation
• Look for mould, algae, or moss growth
• Examine fixings for corrosion or loosening
• Check for resin bleed in warm weather

Periodic Cleaning

• Clean surfaces 1-2 times per year with soft brush and mild detergent solution
• Remove dirt, algae, moss, and organic debris
• Rinse thoroughly with clean water
• Avoid pressure washers which can damage wood fibres
• Allow to dry completely before applying treatments
• Remove any surface resin with appropriate cleaner if necessary

Treatment Reapplication

• Reapply stains and sealants every 1-3 years for high-exposure areas
• Reapply every 3-5 years for protected or low-exposure areas
• Clean surface before reapplication
• Apply in dry, temperate conditions (avoid direct hot sun)
• Follow manufacturer’s coverage rates and application instructions
• Ensure good penetration given larch’s resinous nature

Ventilation Requirements

Proper airflow is critical for longevity and prevents moisture-related issues:

• Ensure adequate ventilation beneath decking to prevent moisture accumulation
• Maintain minimum 150mm clearance from ground to underside of deck boards
• Install cladding with ventilated cavity using battens or counter battens
• Avoid trapping moisture behind boards
• Use breather membranes that allow vapour transmission
• Keep vegetation trimmed back from timber surfaces
• Good airflow helps manage larch’s hygroscopic moisture cycling

Common Issues and Solutions

Address minor problems before they become major:

Surface Mould or Algae

• Clean with proprietary timber cleaner or diluted detergent solution
• Scrub gently with soft brush
• Rinse thoroughly
• Allow to dry and reapply protective treatment

Greying or Fading

• Clean surface thoroughly
• Lightly sand if necessary to remove weathered layer
• Apply UV-protective oil or stain to restore colour

Splitting or Checking

• Minor splits and checks are natural characteristics that add character
• Do not affect structural integrity
• Seal larger splits with flexible wood filler if desired
• Ensure proper treatment to minimize further movement
• Natural result of moisture cycling in hygroscopic timber

Water Staining

• Usually temporary and will blend as timber weathers
• Clean affected areas and reapply water repellent
• Ensure proper drainage to prevent standing water

Resin Bleed

• Natural occurrence in warm weather, especially when new
• Wipe away excess resin with white spirit or turpentine
• Reduces over time as timber ages
• Not a defect—natural characteristic of resinous timber

Longevity and Performance

With proper installation, treatment, and maintenance, European larch provides excellent service life:

• Decking applications: 50+ years with regular maintenance
• Cladding applications: 50+ years or longer with proper care
• Naturally durable heartwood provides good resistance
• Regular maintenance significantly extends lifespan
• One of the most cost-effective and sustainable choices for exterior timber
• Excellent strength-to-weight ratio for structural applications

Professional Maintenance Tips

Optimal maintenance timing is during spring and autumn when weather is temperate. Avoid applying treatments in direct sunlight, extreme heat, or when rain is forecast within 24 hours. Keep records of treatment dates and products used for reference. Consider professional cleaning and refinishing services for large or complex installations. Be aware that larch’s resin content may require specialized cleaning before retreatment.

Need Help?

European larch offers the perfect balance of natural beauty, durability, and value—providing you with an outdoor space or exterior finish to enjoy for generations to come. For maintenance product recommendations, treatment schedules, or specific care advice, our team is always on hand to assist. Contact us for tailored support to suit your project.