Exterior Joinery Maintenance Guide
Whilst timber coating systems are guaranteed to last many years in an exterior environment, certain considerations must be made to ensure joinery remains in a sound state. The natural beauty of timber as a material for Exterior Joinery means that, if maintenance is carried out regularly, it will retain its visual appeal for a lifetime.
It is important to remember that regular, minimal maintenance will make recoating / re-decorating joinery a far easier job and as such, Morrells have compiled an easy to follow maintenance plan.
Points to note
Mould and Algae
Whilst mould and algae pose little initial threat to the coating other than the aesthetic appearance, prolonged contact can have a detrimental effect on the coatings surface and lead to water absorption issues over time.
Whilst soapy water may work for early mould attacks, a wipe with a solution of one part bleach to five parts water should be enough to remove most stains. If the discolouration persists then use of a nylon bristled brush (Not metallic) can be used to remove the more stubborn stains.
Areas where the coating has been damaged or more severely eroded to the point where bare timber is exposed, action must be taken immediately as this exposure will get progressively worse and will lead to extensive maintenance/re-decoration in the future if left unattended.
Timber whose orientation is north facing and is predominantly sheltered will generally require less maintenance than south facing timber on window sills or beads. As a general note, any repairs should be carried out as and when necessary.
Inspect the joinery for changes due to the natural settling and seasoning processes. A general rinsing or cleaning process is likely to be all that is required to maintain the freshly manufactured appearance. See Cleaning and Washing cycle section below.
Inspect the joinery for changes. If areas are seen where the coating has lost its lustre or aesthetic appearance then a more intense cleaning/washing cycle would be recommended. See Cleaning and Washing cycle section below.
Every three to five years
The application of a maintenance coating is often recommended on a 3–5 year cycle (or as needed) for exterior joinery since many factors, such as the joinery’s orientation, can influence the life expectancy of a coated timber system. See reapplying coatings/redecoration section below.
All products deteriorate over time and this is particularly true of those that are exposed to the elements. Wind, rain, sunlight, mould spores and general grime all contribute to the breakdown and deterioration of all materials. It is therefore important at this stage to maintain the system by increasing this barrier between the wood and the elements through the introduction of a maintenance coating. See reapplying coatings/redecoration section below.
A suggested recoat/maintenance coating table is shown in Table 1, however, in practice, carrying out the first redecoration approximately one year before the recommended time will significantly improve the longevity of the coating system. By using this table, the redecoration period for each face can therefore be evaluated.
Cleaning and washing cycle
Wash with hot water and liquid detergent every 6 months. Rinse with clean water. During this process it is advisable to inspect all components of the window for defects and to take action if necessary.
Reapplying coatings – redecoration
Remove any loose coating material from the affected areas and gently abrade with a medium grade of sandpaper (240 grit or higher), taking care to sand in the direction of the grain. Ensure that any grey timber that has been damaged by ultraviolet light is removed back to a clean, bright surface.
In DRY weather, brush apply a single coat of omnia® Clear or Colour using a synthetic bristle brush to the abraded areas, ensuring that any areas of end grain are sufficiently coated with End Grain Sealer. Allow the coating material to dry.
See photos for recoat schedule.