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Estimating the quantity of paint required
14 November 2014


Interior walls: Paint Master Sheen

Measure the length of each wall in running meters and multiply that by the ceiling height (from the floor to the ceiling):

120 m (length)x 2.7 m (floor to ceiling height) = 324m2   

Now divide the m2 by the paint’s spreading rate and remember that you need 2 coats:

324 m2  / approximately 8 m2  per litre = 40.5L x 2 coats = 81 L required to paint 2 coats 

Exterior walls

Measure the length of all the walls in running meters and multiply that by the height of the roof. An average roof is 3.5m in height.

Paint Master Texture Paint

Smooth Plaster

90m (length)  x 3.5m (height) = 315 m2

315 m2  / approximately 6 m2  per litre =  52.5 L x 2 coats = 105 L required to paint 2 coats

Rough Plaster

315 m2  / approximately 5 m2   per litre = 63 L x 2 coats = 126 L required to paint 2 coats

Paint Master Smooth Finish: Sheen

Smooth Plaster

90m (length)  x 3.5m (height) = 315 m2   

315 m2 / approximately 8 m2 per litre = 40 L x 2 coats = 80 L required to paint 2 coats

Rough Plaster

90m (length)  x 3.5m (height) = 315 m2   

315 m2 / approximately 7 m2 per litre = 45 L x 2 coats = 90 L required to paint 2 coats

Roofs: Paint Master Roofmaster

When estimating the paint required for painting a roof, you need to measure the floor area, as well as estimate the pitch of the roof.

The following calculation can be used:

Floor area x % for pitch x % for corrugation / spread rate x 2 coats = paint required

220m2 x 30% pitch x 30% corrugation =  372 m2 / approximately 6 m2 per litre = 62 x 2 coats = 124 L required for 2 coats

Tip: The spreading rate on a zinc roof will be more than for a tile roof, as the tile roof is more course.