WATER REPELLENCY – PRESSURE TREATED TIMBERS FOR SHEDS, GARDEN BUILDINGS AND ANIMAL HOUSING
Pressure preservative treatment is designed to prevent wood decay and insect attack to give softwood construction and landscaping timber products an extended and low maintenance service life. The treatment is not intended to perform as a waterproofing agent.
When using pressure treated cladding timbers in the construction of sheds or garden buildings the following guidelines should be followed to help prevent any water ingress:
The Timber Research and Development Association (TRADA) recommends a 16-19mm nominal thickness for cladding timbers.
Nail heads should only be driven marginally below the surface of the cladding timbers.
A suitable airflow should be allowed throughout the structure to assist on-going drying.
The dry, external timbers will need ingress protection added through the application of an appropriate and well maintained water repellent coating, which should be applied to the dry external timbers following the relevant manufacturer’s guidelines.