During this time of year, families getting ready to build often ask me some version of the same question: "Should we wait until spring to start building?" It's a really good question, and I love that they're thinking about it. My honest answer is that building a house in the rain usually isn't the problem. The problem is what happens when wet lumber gets closed up inside your walls, or a detail that was never tested meets its first real storm, and nobody was checking before the drywall went up.
Storms don't create defects in a home, unless it's a really brutal storm, but they will reveal them. After you've done all the planning, designing, and building of your dream home, that first heavy rainstorm can often feel tense for homeowners.
Short answer: building a house in the rain is normal, and lumber getting wet is often unavoidable. What matters is getting the house dried in quickly, measuring framing moisture before insulation, and testing the spots storms find first, while the walls are still open.
Usually not. Rain during construction is normal, and waiting a season rarely changes the outcome on its own. What changes the outcome is the plan: getting the house "dried in" (roof, windows, doors, and weather barrier on) before the heaviest rain, protecting materials on site, and checking moisture before anything gets closed up.
That plan works best when it's written into your plan set, construction contract, and schedule before you break ground, so the checks have a place on the calendar and everyone knows they're coming.
The first big storm is the most thorough inspection many homes will ever see. It applies rainwater to every window and door not protected under the roofline, every flashing detail, the grading around your home, and your gutters, all at the same time.
That matters because water is the main way houses fail. HUD's building research describes moisture as commonly regarded as the single greatest threat to the durability of housing, and in Victoria, Australia, 92 percent of about 2,178 accepted domestic building insurance claims had at least one water-related defect.
Your city inspector won't run these checks for you. The residential code sets minimum requirements for safety, health and general welfare, and your home can pass every inspection without anyone measuring the moisture in its framing. A heavy storm is a good indicator of waterproofing issues, but after move-in is the worst possible time to find them. That's why my rule of thumb with clients is:
“We’re not waiting for a storm to come through after the home is complete to reveal an issue; we’re going to test it DURING construction.”
When you build in the rainy season, check each part of the house right before it gets covered up: the framing, the windows, the roof decks and balconies, and the air barrier. Here's what that looks like, in the order it happens on a typical build we consult on. Think of each check as scheduling a storm on purpose, while the walls are still open and the fix is still simple.
Your framing package, the lumber delivered to frame the house, is typically dried before it ships. Then it sits on site, gets rained on, and gets installed. Lumber getting wet during construction is normal, and often unavoidable. What matters is that it dries back down before insulation and drywall close it in, and that someone actually measures the moisture instead of eyeballing it.
It could be a thorough mold inspection by a licensed professional or sometimes just a moisture meter, but there should be a check and balance before insulation. It's also why we push to get dried in before the heaviest rains come through.
There's no residential code requirement to water-test your windows, so we test the first few windows installed before the rest go in. I walk through exactly how that test works, and how to plan it, in my window leak testing podcast.
You can flood-test flat roofs, roof decks, and balconies over living space, and you should! Again, this is where our consulting process goes above code minimums. It's far easier to find a pinhole in a membrane before tile or pavers go on top of it, and definitely easier to test during construction than to discover a leak after all the finish work is in place.
A blower door test depressurizes the house to find where air is leaking through. Many energy codes now require a blower door test at the end of the build, but by then the air leakage could be behind the drywall. We like to run one before drywall too, while the gaps are still easy to find and seal up. Air moving through a wall can carry humidity with it, so this test matters for moisture, not just for energy.
Before drywall goes up, there's one last look at everything that's about to disappear: flashing, framing, moisture readings, plumbing, and any spot that got wet, along with a mold inspection once the house is dried in. I'm also a big fan of a 3D scan of the interior walls, so you can always reference what the walls looked like before they were covered up.
None of this is about distrusting your builder. Most good builders welcome an additional pair of eyes on the project, because it protects their work too. Research on water damage in buildings found that design and construction quality were the prominent causes, and better inspection routines were among the most common proposed solutions. It's about making sure someone is checking, because on most projects, nobody is.
You don't have to know every construction detail, but you should know who is checking the work before it gets covered up, so you can have peace of mind when that first heavy rain comes through.
Yes, it's normal and often unavoidable. The risk comes when wet framing gets closed in by insulation and drywall before it dries, because it can stay wet inside the wall. That's why the framing should be checked with a moisture meter before insulation goes in, not judged by eye.
Not necessarily. The rain itself usually isn't the problem. A schedule that gets the house dried in before the heaviest rain, materials protected on site, and moisture checked before close-in matters more than the season you break ground in.
A house is dried in when the roof, windows, doors and weather barrier are installed, so rain stays out of the structure. Getting dried in quickly protects the framing and the work inside, and it's the milestone to plan around when building in the rainy season.
Many energy codes require one at the end of the build. That final test confirms the number, but any leaks it finds are already behind drywall. Running an extra test before drywall finds air leaks while the gaps are still open, which matters because air moving through a wall can carry moisture with it.
Creating a sanctuary for your family should feel exciting and clear, never overwhelming. As your healthy home owner's rep {→ service page}, we coordinate quality control throughout construction, from framing moisture readings to window water testing, so that first heavy rain is just rain.
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