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Maintaining your Greenhouse

All of our structures are specifically designed to be as low maintenance as possible. Our Western Red Cedar is packed full of its own natural oils that protect the timber from rotting and the mortise and tenon joints ensure the structure wont warp over time.

The Ageing Process

Over time the cedar will bleach down to its natural silver and grey tones. Many people prefer the natural weathered appearance and choose not to treat the structure. Unlike any other timber, cedar is susceptible to absorbtion of moisture to attain equilibrium with the surronding atmosphere. As a result this moisture can track to the inside of the structure particularly in the areas that are subject to the greatest weathering. Because of the fibre structure of the cedar it will also dry very quickly which often will leave a mark where the extractives have been released. These extractives are the oils naturally present in the cedar that make it resistant to rot.

As the wood weathers it gradually changes colour, the first stage is the darkening of the wood as water soluble extractives are drawn to the surface. In time this trend reverses and the wood gradually turns driftwood grey. This greying will not always occur on the internal face.

Retaining the Red

Should you wish to help retain the original colour a clear water repellent preservative can be applied to retard this colour change. these can generally be applied rapdly and easily and will minimize the initial stage of darkening and reduce the extractive staining. Alternatively you may choose to accelerate the greying of the timber by using bleaching oil. Or simply given the long life of cedar leave if be and accept the rustic charms of the cedar as it ages over many years to a silvery grey patina.

Spring Cleaning

We do recommend that once a year you carry out a 'Spring Clean' of our structure. Using a hard brush, clean in the corners and remove old soil and debirs and wash down with a diluted cleaning fluid (jeyes for example). We all need some tender loving care in our lives!


The autovents on your structure are manufactured for Gabriel Ash by Bayliss. The metal piston contains a mineral wax which under increasing temperatures pushes the piston rod up opening the vent. The vent is set to start opening between 12°C and 75°C. They function in the warmer months of the year when the temperatures are high both inside and outside the greenhouse. because they rely on the ambient temperature there will be occasions in late Spring and Autumn when it is not warm enough for them to open.

Adjusting Your Vents

These autovents are pre-set in the factory and should not require any adjustment. The autovent has two strong stainless steel springs which assist in closing the vent when the wax cools. the springs also act a safety mechanism. Should the vent be subject to a strong gust of wind on a day when the vent is open then the piston will disengage and the vent will shut. Once the winds have passed it is necessary to reset the autovent manually. This can be done by lifting the flap by hand (working against the force of the springs) and realigning the piston rod with the hole in the braket that is attached to the aluminium flap. Alternatively the nut that is attached tot he bracket that secures the piston to the wood can be loosened allowing the piston to drop down. Once the piston is aligned with the hole in the upper bracket it can be repositioned as before and the nut tightened.