Exterior paint for 240 ft of stucco at 9 ft high, 1 coats
| Paint | 12.68gal |
|---|---|
| What to buybuckets pay from about 3.6 gal up | 3 × 5 gal |
| Primerstucco is porous — primer is a separate coat, not an option | 14.91gal |
| Wall area240 ft perimeter × 9 ft, less 6 windows and 2 doors | 2,028ft² |
| Spread raterough and porous; a sprayer plus back-rolling is the only sane method | 160ft²/gal |
| First coat | 12.68gal |
| Each later coat15% further on a sealed surface | 11.02gal |
Notes
- Surface texture, not brand, decides the spread rate. Stucco takes about 160 ft² per gallon — rough and porous; a sprayer plus back-rolling is the only sane method. The same house in smooth fibre cement would take 5.79 gal per coat against 12.68 here.
- Two weather limits matter more than the gallon count. Surface temperature must stay above about 10 °C for the whole cure, not just while you are painting — a warm afternoon followed by a cold night gives a film that never coalesces. And the surface has to be dry: dew point matters as much as rain, which is why early-morning painting on a clear autumn day so often fails.
- Stucco needs primer as a separate coat — 14.91 gal. On brick and stucco a masonry primer also seals the alkalinity that otherwise burns through the topcoat as patchy discolouration months later.
- Wash it first, and let it dry properly. Paint over chalky or dirty siding fails at the interface no matter how good the paint is, and pressure-washed wood needs two or three dry days before it is ready — a moisture meter reading under 15% is the honest test.
- Back-roll anything sprayed. Spray alone lays the paint on the surface; back-rolling works it into the grain and the grooves, and on stucco that is the difference between six years and twelve.
- Buy it all at once and box it. Exterior walls are seen in full sun from a distance, which is the least forgiving lighting there is for a batch difference.
Texture decides the spread rate, not the brand
stucco takes about 160 ft² per gallon. The same house in smooth fiber cement would take noticeably less, and in brick noticeably more — the mortar joints drink more than the brick does.
240 ft of perimeter at 9 ft high, less 6 windows and two doors, is 2,028 ft². At 1 coat{lop|s} that is 12.68 gallons.
The second coat is cheaper
Once the surface is sealed, paint spreads about 15% further. Doubling the first coat would say 12.68 gal — 0 gal more than you need, sitting in the garage until it separates.
Two weather limits matter more than the gallon count
Surface temperature has to stay above about 10 °C for the whole cure, not just while you are painting. A warm afternoon followed by a cold night gives a film that never properly coalesces, and it comes off in sheets the following spring.
Dew point matters as much as rain. Early-morning painting on a clear autumn day fails constantly for exactly this reason — the siding is wet with dew that you cannot see.
Wash first, and wait
Paint over chalky or dirty siding fails at the interface however good the paint is. Pressure-washed wood needs two or three dry days; a moisture meter reading under 15% is the honest test, not "it looks dry".
Back-roll anything you spray
Spray lays paint on the surface. Back-rolling works it into the grain and the grooves. On stucco that is the difference between six years and twelve.
Nearby sizes
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Read more
- How Long Exterior Paint Lasts — Prep Decides It, Not the PaintThe same paint on the same house lasts twice as long on the north wall as the south. That tells you what is actually wearing it out.
- Best Temperature to Paint Outside — the Overnight Low Matters More Than the AfternoonA warm afternoon followed by a cold night gives a film that never properly forms. It looks fine in October and comes off in sheets in March.
- Paint the Siding or Replace It: The Twenty-Year ComparisonPainting is a quarter the cost and lasts a fifth as long. That makes it close on money and decisive on everything else — as long as the substrate underneath is sound.
- Cost to Paint Exterior Siding by Material and Storey CountExterior prep is half the invoice and the entire reason one job lasts twelve years and the next one peels in three.