TIMBER T
he first months of the year have brought persistent rain across much of the UK. For builders’ merchants and site teams alike, the conditions have served as a reminder of just how vulnerable timber can be when it is exposed to moisture for extended periods.
Timber remains one of construction’s most valued materials because of its versatility, strength and natural appearance. Yet those qualities depend heavily on how well the product is handled between the point of manufacture and the moment it is installed. When timber is stored poorly, transported without adequate protection or left exposed in merchant yards during prolonged wet weather, it can quickly deteriorate. With the construction sector continuing to work under pressure, protecting timber stocks is not simply about good housekeeping. It is about reducing waste, preventing costly delays on site and maintaining the quality that customers expect when they collect materials from their local merchant branch.
Moisture: the biggest risk Rain, damp air and standing water all create challenges for timber storage. Even timber that arrives in perfect condition can become unsuitable for use if its moisture content changes significantly before installation. When timber absorbs excess moisture it can swell, distort or crack as it dries out again. In some cases, fungal growth may begin to develop, particularly if the timber remains damp for prolonged periods. These issues can affect both the structural performance and the visual quality of the product.
For merchants, the process of protecting timber should begin as soon as deliveries arrive. Checking moisture content at the point of delivery is a simple step that can prevent problems further down the line. If the material does not meet the expected specification, it should be raised immediately with the supplier.
Keep it covered
In an ideal world, timber products would be stored indoors in the same environment in which they will eventually be used. In reality, merchant yards often rely on outdoor storage, especially for bulk carcassing timber. When timber must be stored outside, protection from rainfall becomes critical. Stacks should always be raised off the ground using pallets or bearers so that water cannot pool underneath. This also allows air to circulate around the timber pack. Coverings should keep rain off while still allowing the timber to breathe. A breathable
HOW DRY ARE YOUR TIMBER STOCKS?
After one of the wettest starts to the year in recent memory, TDUK looks at why careful timber storage and transport are essential to help protect stock and minimise waste.
The journey from supplier to merchant yard introduces another set of risks. Flatbed vehicles are commonly used for timber transport, yet the load must be properly secured and protected from weather exposure.
waterproof sheet or tarpaulin, supported so it does not sit directly on the timber surface, can provide effective protection. If coverings sit tightly against the boards, condensation can build up underneath and cause the same problems that the covering was intended to prevent.
Attention to detail also helps. Stacks should be positioned away from areas where rainwater collects or where water may splash from passing vehicles. Even small amounts of repeated moisture exposure can gradually damage timber packs over time. Different products require different care Not all timber products respond to moisture in the same way. Carcassing timber is generally more robust, yet it still benefits from careful stacking on evenly spaced bearers to prevent distortion as moisture levels change. Joinery items such as doors and windows require even greater protection. These products often arrive ready for installation and are supplied with protective wrapping. They should remain wrapped until required and be stored vertically in a dry, ventilated area that closely matches the conditions where they will be installed.
Sheet materials also require careful handling. Boards should be stored flat on bearers spaced no more than 600mm apart, with thinner sheets receiving additional support to prevent sagging. Interior grade panels should never be stored outdoors.
April 2026
www.buildersmerchantsjournal.net
Before loading, vehicles should be clean and dry to prevent moisture transfer. Packs should be secured using ratchet straps with protective padding so that the straps do not mark or damage the timber surface. Over tightening the straps can also cause damage, so care must be taken to apply the correct tension. Rain protection during transit is equally important. A waterproof covering that allows airflow will help prevent rain penetration while avoiding condensation build up beneath the sheet.
Organisation still matters Even in challenging weather conditions, good yard organisation remains one of the simplest ways to protect timber stocks. Clear labelling, logical storage layouts and regular stock rotation reduce the need for repeated handling and minimise the risk of damage. Staff training also plays an important role. Every member of the team who handles timber should understand how it needs to be stacked, moved and protected from the weather. When these practices become routine, merchants are better equipped to protect their investment and maintain product quality.
After months of persistent rain, the message for the industry is straightforward. Timber performs exceptionally well when it is cared for properly, yet prolonged exposure to moisture can quickly undermine its quality. By maintaining good storage and transport practices across the supply chain, merchants and contractors can ensure that timber arrives on site in the condition it was intended to be used. BMJ
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