Wooden facadesCheck the state of wooden facades once a year, as maintenance at the early stage will prove to be cheaper than damage repairs several years later.
Washing will be sufficient if the paint surface is dirty or mouldy, but otherwise in good condition. In this case, wash down with a solution of Tikkurila Huoltopesu (Maintenance Cleaner) and warm water (1:10), using a sponge or soft brush. Spread the solution from the bottom upwards, leave for 15 minutes and then rinse thoroughly. Use a concentrated solution (1:1) to remove stains.
Wash off the worst outcrops of mould with a solution of Tikkurila Homeenpoisto (Mould Removal) and water (1:3), using a sponge or soft brush. Spread the solution from the bottom upwards to avoid surface runs, leave for 30 min. and then rinse thoroughly. Washing always dulls the surface, which will then require new maintenance treatment. When using translucent products, remember that mould removal always lightens wood surfaces.
Note that surfaces treated with Swedish Farm Red paint cannot be washed like film-forming paints. Treat Swedish Farm Red carefully, gently brush or wash dirt off it using only water.
Damage to specific parts of wooden structures usually indicates structural weakness, repair immediately to prevent further damage.
Maintenance painting intervals
As facade structures and materials are exposed to outdoor weather conditions, there are no hard and fast rules about how often exterior surfaces should be maintained. Surfaces treated with wood oils may even require maintenance once a year.
The maintenance interval for surfaces treated with translucent products is usually 3 to 5 years, and over 10 years for opaque products. Even the direction in which the facade is facing can lengthen or shorten the surface lifecycle by several years.
Identifying paint typesDetermining the right type of paint is important, as facades should be maintained with the same type of paint used previously. The following rules of thumb are useful for identifying paint types:
Water-borne acrylate paint
The old paint film is pliable and will not crack if bent. Old paint film may crack along the wood grain. Concentrated alcohol such as methylated spirits will soften acrylate paint surfaces.
Old paint film is brittle and may crack if bent. A chalk-like substance accumulates and leaves residue on the fingertips when wiped across the surface. Paint film may crack in squares or across the wood grain. Lye (pH 13- 14, as in certain detergents) softens and yellows oil paint surfaces.
Before starting maintenance work, read the maintenance painting and pretreatment instructions for each product carefully, as they will have a decisive effect on the outcome.
For further instructions, refer to Instructions > Board and log walls, product data sheets and the Painting Guide for Wooden Houses
Tip: Record all work procedures in the maintenance log for future use.