TV Reno Expert’s Advice: How to Keep Water, Mold and Pests Out of Your Home

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in Features, Healthy Home, Indoor Allergies
Published: March 28, 2017
Scott12TV's Scott McGillivray. Photo: Courtesy Income Property

To Scott McGillivray, it is every homeowner’s worst enemy.

The host of DIY Network’s “Income Property” and veteran real estate investor has seen more than his share of horror story houses, and knows all too well the serious problems that water, even in quite small amounts, can create. Water can give rise to allergy- and asthma-triggering mold, nourish dust mites, damage foundations, rot wood, and even attract destructive insects.

“They like wet wood. So if you have moisture coming in through your windows or your basement, or even heavy amounts of condensation, it’s basically an invitation for carpenter ants or termites to get in and start colonizing your walls,” says McGillivray. “It’s horrifying.”

People with allergies and asthma do everything they can to control unwanted moisture: using bathroom and kitchen fans to oust the condensation, installing dehumidifiers to bring down humidity levels, and keeping a close eye on plumbing to make sure there aren’t any nagging leaks.

But what they may fail to notice is that the battle frequently starts from the outside. Water can seep in through weather-beaten roofs, leaky siding, cracked foundations or poorly sealed doors and windows. Those leaks can fuel mold and other problems that won’t quit until the moisture is stopped.

Fortunately the popular TV personality, who has renovated hundreds of spaces including several properties of his own in the U.S. and Canada, knows exactly how to keep the water at bay – and he shares his most essential pointers so everyone can breathe easier.

Start From The Top

When it comes to moisture intrusion in the home, there are plenty of possible culprits, but McGillivray says faulty roofing is the most common. Sometimes the roof isn’t properly sealed around vents, chimneys and skylights; sometimes there’s no ice and water shield underneath to protect against water from wind-driven rains and winter ice dams. But most of the time, homeowners simply wait too long to take action.

“They over-extend the life expectancy of their shingles and wait for leaks to happen. They say, ‘It’s fine, it’s not leaking’ – but then it starts leaking like crazy and the damage has occurred,” says McGillivray. “People wait until it’s too late.”

With the best intentions and heaps of insulation, homeowners may also commit the error of over-sealing their attics, especially the soffit areas that are meant to be open and draw air in.

_S1_3404 (1)Photo: Courtesy Income Property

“Just recently I did a place where they thought that, by adding a ton of insulation and really putting it into the sides where the soffits are, they were doing themselves a favor. But what they ended up doing was blocking off any air circulation in the attic,” recalls McGillivray.

“And when you went up in the attic, the whole roof from the underside was black with mold. There were thousands and thousands of water droplets; it looked like someone took bubble wrap and painted it black on the ceiling. That was all mold because the attic was sealed.”

So how can you tell when it’s time to redo your roof? There are a few telltale signs: if your shingles are beginning to curl or peel, the roof has likely reached the end of its life; similarly, if any shingles are missing, it probably means they’re no longer holding and it’s time. And of course, if you notice signs of leaks in your attic – moisture stains for instance – you may want to call in the pros.

McGillivray recommends always looking at the southwest side of your roof, which, in most regions, gets the most sun, wind and rain – and the most wear and tear. He says these shingles usually age 25 percent faster than the others.

“So you might be looking at your house from the road, and say, ‘Hey, my roof looks great? But you might be driving in from the north,” says McGillivray “Take a walk to the back of your yard, look up at your shingles and make sure they’re in good shape.”

And if you think you can get away with a shortcut or a smaller fix, McGillivray says think again, because if one section is failing, the rest of the roof is likely not far behind. So unless it’s a small repair around a skylight or roof vent, or on an overhang that weathers more quickly, you’re likely best to replace it completely – and not necessarily with the cheapest option.

“I always say, you have to be pretty wealthy if you want to be cheap because you’re going to pay more for it in the end,” he says, adding that some people cut corners by shingling over old shingles, which is illegal in some jurisdictions because it can create a weight problem and a fire hazard.

“Usually you’re best to start from scratch because then you can repair any sheathing damage underneath. And I always go with a high-quality shingle. I just shingled my house, and I used an 80-year shingle called the Presidential Shake. I say do it once and do it right,” says McGillivray, who advises going with the style of roof that best suits the climate as well as the style of your home and the neighborhood. “You don’t want to be redoing your roof all the time because it’s a huge pain in the butt.”

-Photo: Thinkstock

In The Gutter

While you’re thinking about your roof, adds McGillivray, don’t forget about your gutters and downspouts, which are designed to direct rainwater off your roof and away from your house. But they can’t do the job if they’re bent, broken, clogged or missing.

“Water running off the side of your house and splashing on the ground will deteriorate any exterior material you have,” says McGillivray, who advises installing gutters even in sunnier parts of the country where they may not be required by code. “For instance, if you’ve got a wood board and batten finish, just the splash back is enough to rot the whole thing out.”

McGillivray also recommends directing downspouts as far away from the house as possible – a minimum of five feet from the foundation, and preferably more – because if you don’t, what starts on the roof can easily come in at the foundation.

“A company that comes in to install downspouts will typically only do a splash pad at the bottom of your downspout, and that’s where they leave you,” he says. “Get an extension on there, and go at least live feet from the side of the house. Don’t just leave it splashing onto a splash pad or you’re going to have problems.”

On The Dry Side

When it comes to siding, stone is McGillivray’s material of choice for its look, its durability and its weather resistance. Many contractors also love fiber cement siding – also called “Hardie board” or “Hardie plank,” after popular manufacturer James Hardie – which looks like wood but requires almost no maintenance or upkeep.

McGillivray also likes vinyl, which is a good option for budget-conscious homeowners wanting to weatherproof, but he steers clear of untreated wood such as cedar, which he argues takes too much maintenance. Others are willing to take on the challenge for wood’s warm, natural look, but it does require regular staining or painting to keep the water out. No matter what exterior finish you have, be sure to check regularly for cracks or leaks, because that’s where water can sneak into the walls and start causing trouble.

Brick walls naturally absorb and release water, but if you see cracks in the mortar between them, or signs of water indoors – warped flooring or stained drywall, for example – it could mean the mortar joints have failed and require attention.

Once it gets in, water almost always travels down, so McGillivray says the first place to check is the basement. “Look for bubbling paint, or water marks on the ceiling, or browning of the seams of the ceiling, or nail pops or screw pops,” says McGillivray, referring to when nail and screw heads become visible through the drywall. He says people should also check to see if the baseboards in the basement look warped or swollen.

“If your doors start to stick or your baseboards look kind of wavy on the wall, that’s typically the MDF [or “particle board”] being saturated with water. Also if you smell mustiness, that’s a big sign.” That musty smell is an almost sure sign of mold, which is a significant trigger for allergies and asthma and can spread quickly, so it’s important to act fast.

A Solid Foundation

If you’re getting leaks in your foundation, or your basement is especially damp, there’s a good chance you have a grading problem – that is, you have soil sloping toward your house and it’s bringing the water with it. Other times clogged or collapsed drain tiles (or “weeping tiles”) are to blame, or there’s Water from a neighbor’s downspout heading your way.

The issue can also be a crack in your foundation, which McGillivray says is especially concerning, because it can mean big bucks to fix, not to mention that it provides a pathway for rodents and insects to come in and make themselves at home.

If you suspect a crack, McGillivray says you should begin by looking at the corners of basement windows, because that’s almost always where they start. “Walk around to the windows in your basement and check the bottom corners of each one. If you have a crack in your foundation, nine times out of 10 it will be right there,” says McGillivray. He adds that, if the basement is finished, you can simply remove small pieces of drywall at the corners of the windows and have a look. “So it’s easy to isolate.”

With a concrete block foundation, keep an eye out for step cracks – they’re the cracks that zigzag along the lines of mortar between blocks – or for breaks in the blocks themselves.

Often leaks do require a big fix – excavation and sealing from the outside, and possibly the repair or replacement of drain tiles – but McGillivray says that sometimes there are easier ways out, such as filling cracks with epoxy from the inside, so it’s important to talk about the options with a contractor.

But especially as weather systems become more extreme, McGillivray says homeowners simply can’t afford to ignore the signs. “Wind can drive rain horizontally, and right into your house,” he says. “You need to keep that seal consistent from the top of the roof all the way down to the bottom of the foundation. There’s really nowhere you can compromise.”

See Scott McGillivray’s TV show “Income Property: On Vacation” on the DIY network and, in Canada, on HGTV Canada.

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