Yeah, it does sound simple and straightforward on paper but painting a house exterior is easier said than done. Timing rules the roost here. Yes, the outcome of an exterior painting job is by and large controlled by timing. Painting is more than coloring a wall, it is way more than that. Exterior paint reacts to a host of things that include sunlight, moisture, temperature and whatnot! Sometimes even a slight change in the night temperature can affect the outcome more than most people expect. Fail to paint at the right time of year and you are most likely to be greeted by a barrage of problems like fading, uneven finish and peeling edges. Of course, the right season is not a panacea for all your painting problems but at least, it will give the paint a fighting chance to put a brave face against the elements. Probably, this is the reason why you need to pay as much attention to timing as you do to choosing the paint itself.
Why timing matters more than brand or color
Contrary to what most people believe, exterior paint does not just dry; it also cures in the process. Environmental factors such as drying time, surface moisture and air temperature etc can heavily influence this chemical coating process. Designed to cure within a temperature range of about 50°F to 85°F, most modern acrylic latex paints are specifically engineered to bond and harden within this small window.
The curing process can slow down significantly if these modern acrylic latex paints are applied outside these conditions. Go too hot and the acrylic latex paint will dry out too fast. If the temperature crosses 90°F, the paint will start evaporating so fast that the molecules of the paint will get very little time to bond together and this will lead to a poor outcome and a shorter lifespan. On the flip side, if acrylic latex paint is applied below 50°F, curing time can double. Adhesion strength can also take a hit. Sometimes, you may witness a massive 30 percent decline in the adhesion strength.
You should also not ignore humidity while painting the exterior of your home. Relative humidity above 85 percent can significantly slow down the moisture release mechanism from paint films and it can lead to issues like cracking and blistering down the line.
Spring Painting
Spring feels like the ideal time of the year for exterior painting and rightly so. The days are longer and warmer than those cold wintry days. Between March and May, most homeowners plan their exterior painting projects. Painting contractors tend to get a lot of leads from suburban areas during this time of the year. But Spring is fickle in nature. Some regions can experience higher than normal rainfall and some regions can also experience a sudden drop in temperature. And then there is morning dew. Morning dew can delay the painting process in the morning. If you don’t give the exterior walls enough time to get rid of the morning dew, moisture can get locked under paint layers and this can cause adhesion issues. Basically, you can choose Spring to paint the exterior of your house, but you need to make sure that you are planning things with a lot of patience.
Summer Painting
The good thing about summer is that it comes with a consistent weather pattern. Of course, the weather would be hot but at least, you don’t have to deal with those pesky issues like morning dew or untimely rain. Stable temperatures and long dry spells make it super easy for homeowners to schedule things. June and early July are considered to be the perfect time of the year to do the exterior painting job. Of course, you have to do something for the heat during these summer months. If you have dark siding, air temperature can exceed 20°F or more in some cases and that means, you need to get yourself prepared for that. Some reports also suggest that during peak sun hours, surface temperatures of wood and vinyl siding can reach a jaw-dropping 120°F.
Don’t even think of applying paint under these conditions because if you dare to do that, the paint would dry out too fast. You need to give the paint time to settle in otherwise, it will lead to issues like fading of color and premature chalking. Try painting early in the morning. It is the only safe option we have here.
Fall Painting
Fall is known for its beautifully balanced nature. Humidity does not go up or down that much and the daytime temperatures also don’t shoot up significantly. You don’t have to bother with rainfall as well because rainfall becomes less frequent during this time of the year. September and October are the best times of the year for exterior painting as the overnight temperature stabilizes most of the time and therefore, you don’t have to deal with issues with paint curing as well. However, Fall has its downside as well. You may not get enough daylight during this time of the year.
A tighter work window is what you will have to deal with. Make sure you stop working whenever the temperature falls below 45°F otherwise, it can affect the outcome. Having said that, we can also safely say that fall is one of the best seasons for exterior painting as it helps extend the lifespan of the paint.
Winter Painting
Winter offers even a tighter work window but the weather is still kinda predictable to a certain extent. At least, you don’t have to deal with unpredictable rise in temperature. Some painting companies have come up with cold weather paints that can be applied even when the temperature is as low as 35°F. However, these products are not meant for regular exterior painting jobs rather these paints should be treated as an emergency solution for touch-ups or time-sensitive repairs.
Higher rates of adhesion failure within the first one or two years when exterior painting is done in the winter are quite common. An inconsistent surface is also something you might have to settle for as painting contractors have to deal with issues like low sun angles, condensation and frost during this time of the year.
