Marcus Chen
Painting the exterior of your house in cold weather is not ideal. The ideal temperature for exterior painting is between 50°F and 85°F (10°C and 29°C). Latex paints are best for most exteriors, and oil-based paints generally have a wider temperature range. If the temperature is too low, the paint will not cure properly, and you may need to repaint sooner than you expected. Dew can form on surfaces, causing the water in the paint to evaporate too slowly, affecting how well the paint resists cracking. Lower temperatures also mean slower drying and longer curing times, so you'll need to allow ample time between coats.
| Characteristics | Values |
|---|---|
| Minimum temperature for painting | Between 35°F and 50°F |
| Maximum temperature for painting | Between 85°F and 90°F |
| Ideal temperature for painting | Between 60°F and 85°F |
| Time of day for painting | Between 10 am and 2 pm |
| Dew point | More than 5 ºF above the surface temperature |
| Humidity | Less than 60% |
| Number of days to cure | Between 1 and several days |
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What You'll Learn
Paint curing and adhesion issues
To avoid curing issues, it's essential to follow the manufacturer's instructions for the specific paint you're using. Most latex paints, for instance, require temperatures between 50°F and 85°F for proper curing. Oil-based paints typically have a wider range and can sometimes be used at temperatures as low as 40°F. Modern acrylic latex paints can be applied in even colder temperatures, as low as 35°F.
Adhesion problems can also occur when painting in cold weather. Paint needs to properly adhere to the surface being painted, and low temperatures can interfere with this process. For example, if the surface is too cold, the paint may not bond correctly and could peel away later. On the other hand, direct sunlight can cause the surface temperature to rise too high, leading to rapid drying and compromised adhesion.
To ensure proper adhesion, it's crucial to allow enough time for each coat of paint to dry. In cold weather, drying times can be significantly longer, so it's important to plan accordingly. Scheduling your painting project during a stretch of warmer, sunny weather can help, but be mindful of excessive heat and direct sunlight, as this can also cause issues.
Additionally, the surface you're painting on should be clean and free of dirt, mildew, and old paint, as these can also hinder proper adhesion. Following the manufacturer's recommendations for surface preparation and taking into account factors such as humidity and wind will help ensure a successful paint job.
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Dew and mildew formation
To prevent dew and mildew formation during exterior painting, it is recommended to paint during the warmest part of the day, typically between 10 am and 2 pm, to take advantage of any sunlight and warmer temperatures. It is also important to check the temperature range specified by the paint manufacturer, as some paints require temperatures between 50°F and 85°F (10°C and 29°C) for proper application and curing. Oil-based paints generally have a wider range and can sometimes be applied down to 40°F (4°C). Specially formulated low-temperature latex paints can be used at even lower temperatures, as low as 35°F (2°C).
In addition to temperature, humidity is also a factor in dew and mildew formation. Excessive humidity can cause water vapour to form on freshly painted surfaces, providing a conducive environment for mildew growth. To mitigate this, it is recommended to avoid painting in direct sunlight or on overheated surfaces. Most experts recommend following the sun's shadow around the house and allowing time for the paint to dry before sunset when temperatures drop and dew formation begins.
To prevent mildew specifically, it is important to clean and sanitise surfaces prior to painting, even if mildew is not visible. Home exteriors can be power-washed using a household bleach solution, which can also be used to test for the presence of mildew. After washing, surfaces should be thoroughly rinsed and allowed to dry. For exterior surfaces, it is recommended to allow as much sunlight as possible and redirect moisture sources, such as dripping air conditioners, misdirected sprinklers, and leaky gutters.
When selecting paint, it is beneficial to choose a paint containing a mildewcide, which is a poison for mildew fungi. The paint label should indicate if a mildewcide is present, and if not, it can sometimes be added by the paint dealer. In warm, damp climates, it is recommended to use a paint containing zinc oxide and a mildewcide for top coats over a primer coat that also contains a mildewcide.
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Paint brush choices
When it comes to choosing the right paintbrush for exterior painting, there are several factors to consider. Firstly, the type of bristles is important. Paintbrushes with natural bristles are typically recommended for oil-based or alkyd paints, such as Benjamin Moore Satin Impervo®. White China bristles, a type of natural bristle, are ideal for woodwork, enamels, and marine applications. They are also well-suited for oil-based paints, as they help eliminate brush marks. Alternatively, 100% polyester bristles are a good choice for all paints, especially lighter or thinner coatings. Polyester bristles offer superior smoothness, robust paint capacity, and minimal brush marks.
Another consideration is the shape and size of the paintbrush. Angled sash paintbrushes, with bristles cut at an angle, are perfect for corners, woodwork, and molding, or any area that requires detailed work. On the other hand, flat sash paintbrushes, with bristles cut straight across, are ideal for larger, flat surfaces with less intricate details. For projects involving cabinetry, furniture, or trim, a foam brush can provide a smooth finish. Additionally, a wider paintbrush, such as a 4" brush, can help speed up the painting process by picking up more paint in a single dip, reducing the time spent on dipping and flinging.
To ensure a high-quality finish, it is worth investing in a good paintbrush. A well-crafted paintbrush will have bristles that flex at the tips and quickly spring back into shape when pressure is released. Flagged bristles, which appear frizzy and are machine-distressed, enable the brush to hold more paint and deliver a more uniform finish. A quality paintbrush will also have a firmly attached ferrule (the shaft binding the bristles) that won't loosen with use. Unfinished wooden handles are often preferred by professionals as they provide a secure grip and reduce slippage.
Proper paintbrush maintenance is crucial to extend the life of your brushes. To clean the inside of the brush, use a paintbrush comb, and for the outside, a stiff nylon-bristle brush can help remove paint without damaging the filaments. While some sources advise against using a wire brush, others find it effective for removing dried paint near the handle, where the paint tends to dry. Remember to save the cardboard wrapper that comes with a new brush, as it helps keep the bristles intact after washing.
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Paint storage
Paint should ideally be stored at a temperature between 15°C and 27°C to ensure it remains usable. A dry and cool room-temperature environment, such as a hallway or storage closet, is best. Avoid storing paint in direct sunlight, near heating vents, or in areas prone to heat, such as attics, as this can spoil the paint. Basements and garages should also be avoided, especially during winter, as they can get too cold.
If you are storing paint for the short term, such as a few days or a week, ensure the can is resealed immediately and kept in a temperate environment. Paint rollers and brushes can be wrapped in clear plastic wrap to eliminate exposure to air and stored this way for up to two days. For longer periods, they can be wrapped and placed in a refrigerator for up to a week. Allow the tools to return to room temperature before use.
The main indicators that paint has expired are smell and consistency. Paint that has exceeded its shelf life may smell sour and strong, and its consistency may become lumpy or jelly-like. If paint freezes, it may be salvageable by allowing it to thaw and mixing it, but it is always best to test on a small area first.
To avoid spoilage, seal the paint container tightly to prevent air and moisture from entering. Label the paint with the colour, brand, when it was opened, and other useful information. Check the paint manufacturer's storage instructions to increase the longevity of your paint.
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Environmental factors
The success of an exterior painting project depends on various environmental factors, including temperature, humidity, sunlight, and wind.
Temperature
The ideal temperature range for exterior painting depends on the type of paint used. Latex paints, for instance, are typically applied between 50°F and 85°F (10°C and 29°C). Oil-based paints usually have a wider range, sometimes as low as 35°F (2°C) or even 40°F (4°C). It's important to follow the manufacturer's recommendations, as painting in temperatures below 55°F can affect the curing time and quality of the finish.
Humidity
High humidity can cause issues with exterior painting. It leads to the formation of water vapour on freshly painted surfaces, impacting the drying process and potentially resulting in bubbles in the paint. The industry standard is to paint when the surface temperature is more than 5°F above the dew point, preventing condensation.
Sunlight
Direct sunlight can cause paint to dry unevenly and compromise adhesion. It's best to avoid painting in direct sunlight and instead follow the sun's shadow around the house to maintain optimal conditions.
Wind
Excessive wind can cause the paint to dry too quickly, so it's ideal to choose a day with little to no wind for exterior painting.
Rain
Rain can cause significant issues with exterior paint. It's crucial to avoid painting if rain is expected within the next 4-8 hours. The painted surface needs sufficient time to dry and cure before any rainfall, which can cause bubbles in the paint.
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Frequently asked questions
Oil-based paint can generally be applied when temperatures are between 40°-90° F, while latex paint should be applied between 50°-85° F. However, some manufacturers now claim that certain paints will cure in temperatures as low as 35° F.
Painting in cold weather can result in slower drying and longer curing times. This can cause issues with the finish quality, such as cracking, peeling, and chipping. Paint that takes longer to dry can also attract insects, dirt, grime, and other debris that can get trapped in the paint.
In addition to temperature, drying times will depend on humidity, sunlight, and other environmental factors. It's important to check the weather forecast for the week before beginning your project and to ensure that the temperature of the surface you're painting is within the paint manufacturer's recommended range.
