Timber is a natural material, so some movement, small cracks, or splits can occur over time. This is completely normal and is caused by the way wood reacts to changes in the environment.
In most cases, these changes are cosmetic only and do not affect the strength, stability, or performance of your garden building.
Why Does Timber Move?
Moisture Changes (Expansion and Contraction)
Wood naturally absorbs moisture in damp conditions and releases it in dry weather. As this happens, the timber expands and contracts. This natural movement can sometimes cause small cracks or splits to appear, usually along the grain.
Uneven Drying
The outer surface of the timber dries faster than the core. This creates tension within the wood, which can result in surface cracks (often called “checks”) or splits as the timber adjusts.
Seasonal Changes
Cracks are more likely to appear during warm, dry periods (such as spring and summer) when timber dries out. In wetter months, these cracks may reduce in size or close altogether.
Sunlight and Temperature
Direct sunlight and heat speed up the drying process, increasing movement within the timber.
Timber Characteristics
Some pieces of timber naturally contain knots or are cut closer to the centre of the tree. These features can make the timber more prone to surface cracking, but they do not weaken the structure.
What Can I Do to Minimise Cracks or Splits?
While timber movement can’t be completely prevented, it can be managed:
Apply a quality wood treatment regularly to help slow moisture absorption and loss
Ensure good ventilation inside the shed to reduce excess moisture and condensation
Treat the shed annually, especially after periods of extreme weather
Pre-drill holes when assembling to reduce stress on the timber when fixing screws
Key Reassurance
Small cracks, splits, or knots are a normal characteristic of timber and do not indicate a fault. When properly maintained, your Tiger shed is designed to remain strong, durable, and fit for purpose for many years.