Preventing and fixing uneven gaps between decking boards

Are the gaps in your timber decking not quite right? Whether due to dodgy installation or natural movement over time, uneven gaps between boards are an irritating issue which can affect both the aesthetics and the safety of your decking. The good news? You can fix them, and we have all the steps you need in this easy-to-understand guide.

Why Does Your Decking Show Uneven Gaps?

Timber naturally expands and contracts when humidity changes, causing decking boards to “move”. Even tough species, such as Cedar and Ekki, are not exempt from occasional movement.

If you do not install your boards with proper fixings and the right spacing between them to allow for this swelling and shrinking, you often end up with odd gaps which look uneven. This can also happen if your fixings have come loose with a lot of wear and tear, allowing your timber boards to shift a little and thus changing the look of your decking.

How to Prevent Uneven Timber Decking Gaps

The best way to stop uneven gaps from appearing is to plan ahead. At the time of installation, ensure you have taken steps to account for movement, with long-term use in mind. We recommend:

• Use spacers during installation: Use decking spacers to leave a consistent gap between boards. The TDCA recommends between 5-8cm, and you can find spacers with this exact sizing so that there is no need to measure each gap. Simple!
• Choose stainless steel fixings: These are far better for timber and will not rust or loosen as easily, keeping boards secure for longer.
• Regular maintenance checks: A quick inspection every few months helps you spot small shifts in your decking boards before they become noticeable.
• Keep your deck clean: Debris (such as stones or leaves) which becomes wedged between boards can, in some cases, begin to push them apart. Regular sweeping of your decking will help keep it clear of items that could get lodged between the boards.

How to Fix Uneven Timber Decking Gaps

If you are dealing with uneven gaps, you can usually fix the issue without replacing the entirety of your decking. To do this, you have a few different options:

1. Look for loose fittings, and tighten any which you find (you might need to replace broken screws or nails with new ones for a more secure fit), moving the boards back into place as you do
2. Replace timber boards which have warped or shrunk too much, using decking spacers to ensure they are correctly placed and installed
3. For wide gaps caused by poor installation, insert a slim infill strip cut from matching timber to avoid needing to move multiple decking boards

Once boards are realigned, lightly sand any rough edges, then apply decking oil or stain so the repaired area blends seamlessly with the rest of your deck.

Find Sustainable Timber Decking at EcoChoice

Looking for FSC® and PEFC-certified timber decking boards for your project? Whether you need replacements for an existing decked area or are looking to build your decking from the ground up, we can help.

Get in touch to order timber decking boards.