Building & renovation
How much exterior wall paint do you need?
How much exterior wall paint for facades and render — liters, cans and waste allowance.
Quick answer
Facade paint covers far fewer square meters per liter than interior emulsion — rough render, micro-cracks and weathered surfaces eat product. Manufacturers often quote 4–6 m²/L per coat outdoors; we default to 5 m²/L with two coats on standard renovation jobs.
Advanced settings
Paint needed
17.6 liters
- Cans to buy
- 8 × 2.5 L
Facade paints yield less (often 4ÔÇô6 m┬▓/L per coat) because the surface is rougher and the film must withstand weather. Two coats are standard on bare render.
How it works
Exterior work also loses material to wind, ladder drip and masking. Use the absorbent or rough surface factor for chalky old paint or bare concrete block. Pair the result with exterior masonry paint rated for your climate (silicate vs acrylic) and check the recoat window on the tin before you order full quantity.
Scaffolding height changes application speed, not yield per m² — but it changes how many litres you can spread per day before the first coat skins over. A long-nap masonry roller on an extension pole covers block faster than a 4-inch brush; budget exterior primer as a separate line item on bare render — often one full coat at similar litres to a single finish pass.
Outdoors the calendar decides more than the roller. Below about 5 °C most facade paints stop forming a proper film — and in autumn the trap is the night, not the day. Applied on a mild afternoon and then left through a cold night, the coat never knits properly, and two winters later it powders off looking like a bad product. Above roughly 80% humidity it will not dry either. The other half is the sun: on a wall hot to the touch the paint skins before it levels, leaving roller texture. Work the shaded side and follow the shade around the building through the day.
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Frequently asked questions
How much facade paint for 100 m² of wall?+
At 5 m²/L and two coats on a normal render: 100 × 2 ÷ 5 = 40 liters before waste and surface factor. Add 10% waste → ~44 L. Very rough brick or porous block can push past 50 L — use the rough-surface multiplier in advanced rather than guessing at the shop.
Do I need primer on exterior walls?+
On bare render or after stripping failing paint, yes — primer stabilizes suction and improves adhesion. This calculator sizes finish coats; add primer separately (often similar liters to one full coat) or use the metal-primer tool if you are on galvanized elements.
Can I paint exterior walls in winter?+
Only inside the temperature and humidity window on the label — typically +5 to +25 °C and dry weather. Cold slows cure and can cause flaking; rain within 24 h of application is a common failure mode. Buy slightly extra so you are not reopening partial cans next season. Never paint facades in direct sun on hot days — the film skins before it bonds.
Roller or sprayer for facades?+
Large flat render: airless sprayer is fastest but needs skill and masking. Textured surfaces and DIY renovators usually roll — slower but less overspray waste. Spraying often needs +15% material in the waste field.
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