Installing a new decking, it’s exciting, it’s ambitious, but most importantly it’s a big investment that can boost the value of your home.
It’s a functional addition that can create an attractive area for relaxing, dining, or entertaining. But this is only if it is done right. Many first-time homeowners encounter common pitfalls during the installation process. Avoid these mistakes to ensure your decking is as safe, durable, and visually appealing as it can be.
Too Small
One of the quickest and biggest regrets homeowners face is building a deck that’s too small for its intended use.
A deck should comfortably accommodate furniture, allow for movement, and match the proportions of your garden.
For reference, the decks in the UK are typically 15 square meters for a small deck, 30 square meters for a medium deck, and 60 square meters for a large deck.
But this can vary based on your garden size and requirements. Always measure carefully, plan for future use, and consider the furniture or activities you want the space to accommodate—online decking size calculators can be a handy tool for this.
The Wrong Way Up
A common mistake many new homeowners make when installing decking is laying the boards groove-side up, believing it provides a better grip. This misconception likely stems from the origins of grooved decking in the UK, where it was marketed as a solution for improved traction in wet weather.
But if you think about it, that grooved decking offers no significant grip advantage over smooth decking.
While grooves can aid water runoff, this only works if the decking is installed at a slight angle to allow proper drainage. When laid flat, grooved boards can actually trap standing water and grime, making them harder to clean and potentially leading to slippery surfaces over time.
By installing the grooves facing down, you improve airflow beneath the decking, which helps reduce the build-up of damp conditions.
This airflow is crucial for preventing wood rot and minimising the risk of timber warping.
But as always, use your manufacturer’s guidance, whatever they say must go.
The Wrong Direction
Orientation plays a bigger part than you may think. Decking boards should ideally run perpendicular to the house to create a visual flow and allow for proper drainage.
Installing boards parallel to the house can lead to water pooling and increase the risk of slipping. Proper alignment also depends on structural considerations, such as the direction of joists.
Using Poor-Quality Materials
Materials will ultimately determine the longevity of your deck. Going the extra mile by investing in pressure-treated wood or composite materials is always a wise idea. Yet, many homeowners still make this mistake. Your decking supplies should be equipped to handle the UK’s variable weather.
Look for materials that meet British Standards for durability, such as BS EN 350 for timber durability ratings. Reputable timber merchants will care about the products they sell, so always check the product descriptions and fine print before buying.
The same goes for your nails and fixings. Opt for stainless steel or galvanised fixings to prevent rust and corrosion. Using subpar nails or screws can lead to weakened joints and structural instability.
Skipping Pest Proofing
Wooden decking is a natural target for pests, particularly wood-boring insects like beetles. This is a common pitfall for homeowners building new decks. Always treat all wooden components with insecticidal and fungicidal wood preservatives.
Consider additional measures such as sealing gaps and using metal joist hangers to deter pests.
Forgetting The Walls
When installing decking adjacent to your house, it’s vital to ensure proper drainage and airflow near the walls. Decking placed too close can trap moisture, leading to damp issues on your property. Maintain a gap of at least 10mm between the decking and walls to allow for adequate ventilation and water runoff.
In Doubt? Hire A Professional To Do It
While DIY decking installation can be rewarding, it’s not always straightforward.
If you’re unsure about design, materials, or installation techniques, hiring a professional can save you time, frustration, and sometimes money if you do the job poorly yourself.
A professional installer will ensure your decking meets building regulations, such as those outlined in the UK’s Building Regulations for safe access.
