Painting

CONCRETE, BRICKWORK, ETC.

Painting - Concrete, Brickwork, Etc.

Cement Rendering, Concrete, Blockwork, Brickwork, Stone.

These surfaces are mainly encountered as exterior wall surfaces and, when decoration is required, are normally coated with a masonry paint system. The more commonly experienced problems associated with such masonry substrates are high moisture content, high alkalinity, cracks and erosion. Albany masonry finishes are sufficiently permeable to allow substrates to ‘breathe’. They are alkali resisting, will fill hair cracks and combat erosion. Brickwork surfaces do not normally present painting problems, apart from Fletton common bricks, where painting is not recommended externally.

If an impervious solvent borne system is required, an alkali resisting primer should be first applied once the substrate has dried out. Where the substrates occur on interiors (notably blockwork) emulsion paints may generally be applied direct.
A general specification guide for painting these surfaces is given underneath.

01 - Preparation

Carry out any necessary repairs to gutters or downpipes and remedy any structural defects.
All surfaces must be clean, suitably dry and free from anything that will interfere with the adhesion of the material to be applied.
Remove all loose or flaking paint or efflorescence by scraping or brushing with a stiff bristle brush (not wire) back to a sound surface and sound edge.
Where extensive breakdown of old coatings is evident, more aggressive removal methods (e.g. high pressure water hosing) may be required.
Cut out cracks, defective joints, etc., and make good with a suitable mix of cement and sand. Allow repairs to dry out.
Treat all areas affected by mould, algae or lichen growth with Albany Fungicidal Wash.
On previously painted interior surfaces in good condition, wash down with a detergent solution to remove any dirt or grease.
Lightly wet abrade glossy surfaces to provide a key.
Rinse thoroughly with clean water and allow to dry.

02 - Good Painting Practice

Do not apply paint coatings in wet weather or when air or substrate temperatures are likely to fall below 5°C during application and drying, or when rain or moisture attack are likely to occur before drying is complete.
When solvent borne systems have to be applied to alkaline substrates, allow sufficient time for drying out in depth and then prime with an alkali resisting primer, e.g. Albany Primer Sealer.
If the extent (if any) of organic growth is difficult to determine, then areas involved should be treated with fungicidal wash.
Allow for sufficient materials, remembering that application to textured surfaces will result in lower spreading rates than over smooth surfaces.

Paint

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