Dunster House Ltd.
Est. 1994

The benefits of pressure treated timber

Pressure treatment for timber products is an increasingly popular method of protecting wood from rot, bug infestation and fungi. The process involves placing timber on a pallet, lathing it, before placing it into a strong sealed chamber. 

TankA pump then removes air from the chamber and in doing so also sucks trapped moisture and air from the timber. A treatment is then pumped into the chamber; rapidly soaking deep into the timber. This replaces the moisture and air that has been sucked out.

Pressure treatments give wood the best protection from rot and infestation, potentially protecting the timber for several years without requiring retreatment.




Pressure chamber used in the pressurising process


Dip and brush treatments vs pressure treatment


Dip and brush treatments 


There are several alternatives to pressure treated timber, which involve dip or brush treatments. Usually, the timber is dipped, or brushed with a solution, which protects the exterior surfaces. 


Surface treatment of wood | KR√úSS Scientific


Solutions tend to be water-based, solvent-based, or oil-based, and require retreatment to prevent any decay or infestation of the timber. Depending on the type of solution, retreatment is recommended between 1 and 5 years.








  • Easier to paint over, which allows customisation of structures, so you can make it your own.
  • Timber can be painted more easily with fewer coats compared to pressure treated wood, therefore is less challenging to customise.
  • Untreated products are usually cheaper than pressure treated.
  • Dip and brush treatments are less effective, as generally only the exterior surface of the timber is covered. Although, this provides a blank canvas to customise and decorate.
  • The wood has to be retreated and maintained over its lifespan, which is generally more expensive and time-consuming in the longer term.
  • Any dip or brush treated structures must be raised off the ground to prevent the ingress of moisture. Accordingly, Dunster House provides all products with pressure treated bearers as standard to minimise this risk.


Pressure treatment



Shed Fully Pressure Treated Timber

Pressure Treated Bearers Latli Shed 3.05 x 2.44














Pressure treatment soaks deep into the timber 


  • Pressure treatments are more effective than dip or brush treatments.
  • This can provide several years of protection against rot and infestation with minimal maintenance.
  • Structures tend to have more water resistance than dip or brush treated structures.
  • More expensive than dip or brush treated timber.
  • Difficult to add paint, therefore tough to customise.





Why Dunster House is the best choice


Fully pressure treated – pre-cut so ends are not dip treated


Most Dunster House products are fully pressure treated. These include our climbing frames, sheds, garden offices, and gazebos and pergolas. This means that the timber is pre-cut to specification before it is treated, whereas most manufactures will cut the wood to size after treatment, which requires the cut ends to be dip treated, compromising protection. Recently, we improved our products further by adding colourant to our pressure treatment. Therefore, Dunster House products are an attractive brown colour, rather than the typical green, which further enhances the appeal of our products and adds contrast to a garden.




rapid grid dunster house log cabin base

Quality products


Although most products are treated, Dunster House provides log cabins untreated for customers to decorate and customise in accordance with their taste and style.

All Dunster House structures come with pressure treated bearers as standard. This maximises protection to the lowest part of the structure, in contact with the ground, ensuring protection and reducing the risk of moisture ingress.



Untreated timber is kiln-dried to remove moisture and act as a pesticide. In many cases, this removes the need to fumigate the timber, which is a key consideration in certain regions.

We strongly advise treating log cabins immediately after construction and continue to treat it regularly to strengthen it against varying weather conditions. If left untreated, it will deteriorate.

A comprehensive guide on treating log cabins can be found here.



Security in mind


Dunster House prides itself on providing some of the most secure timber structures available. Several of our garden buildings offer secure multipoint door locking, providing the same level of security as many properties. Founded in the UK and a manufacturer of windows and doors, Dunster House offers toughened glass and double glazing.


Since 1994, Dunster House has produced industry-renowned timber products. They work tirelessly to provide outdoor products, from safe play systems for children to comfortable spaces and outdoor offices. All products are made without compromise with high-quality materials to ensure longevity, and simple assembly instructions; keeping DIYers in mind.