If you've spotted chunks of mortar sitting in your gutters lately, it's probably time to think about re pointing roof tiles before the next rainy season kicks in. It's one of those maintenance tasks that many homeowners tend to push to the back of the priority list, mostly because we don't spend a lot of time staring at our ridge caps. But honestly, keeping that mortar in good shape is what keeps your ceiling dry and your insulation from turning into a soggy mess.
What are we actually talking about?
For those who aren't roofers, the whole "pointing" thing can be a bit confusing. Basically, your roof has these "ridge caps"—the triangular tiles that sit along the peaks and hips of the roof. To keep them in place, they're set in a thick bed of concrete, which we call "bedding."
Now, the bedding does the heavy lifting, but it's not particularly pretty or waterproof on its own. That's where the pointing comes in. It's a thinner layer of material that goes over the edge of the bedding to seal the whole thing up and give it a clean finish. Over time, because your house naturally shifts and the weather does its thing, that mortar starts to crack, shrink, and eventually fall out. When that happens, you're looking at re pointing roof work to get everything sealed back up.
Why you shouldn't just ignore those cracks
It's easy to look up and think, "Eh, it's just a tiny crack, it'll be fine." And sure, for a while, it might be. But once water finds a way in, it doesn't just stop. It travels. You might have a crack on the right side of your roof, but the water ends up dripping onto your bedroom ceiling on the left side because it ran down a timber beam.
Beyond the leaks, there's the structural side of things. The pointing acts like a glue. If it's gone, those ridge tiles are basically just sitting there by gravity. In a high-wind event or a bad storm, those tiles can actually shift or blow off entirely. If you've ever seen a ridge tile flying through the air during a cyclone, you'll know it's not something you want to experience.
Spotting the signs from the ground
You don't necessarily need to climb a ladder to know if you're in trouble. Most of the time, the roof will tell you it needs help if you know where to look.
First off, check your gutters. If you see grey, sandy chunks or what looks like broken-up concrete sitting in the bottom, that's almost certainly your pointing giving up the ghost. Another thing to look for is "weeping." If you see dark streaks or moss growing specifically around the edges of the ridge caps, it's a sign that moisture is hanging out in the mortar, which usually means it's porous and failing.
If you're feeling brave and have a safe way to look at the roof from a window or a sturdy ladder, look for gaps. If you can see daylight through the mortar or notice that some ridge caps look like they've "slipped" down an inch or two, you're definitely in the market for some re pointing roof repairs.
The move to flexible pointing
In the old days—say, twenty or thirty years ago—roofers used a simple sand and cement mix for pointing. It worked, but it was brittle. As the sun heated the roof and the house settled into the ground, that cement would crack because it had zero "give."
These days, almost everyone uses flexible pointing. It's a pre-mixed compound that stays slightly rubbery even after it cures. This is a game-changer because it allows the roof to move slightly without the seal breaking. It also comes in a huge range of colours, so you don't have to worry about painting it afterward to match your tiles. If you're hiring someone to do the job, make sure they're using a high-quality flexible compound; it'll last twice as long as the old-school stuff.
What the process actually looks like
If you're wondering how a pro handles re pointing roof projects, it's usually a three-step dance.
- The Clean Up: This is the messiest part. They have to get rid of all the loose and crumbling mortar. If the bedding underneath is still solid, they might just grind back the surface. If the bedding is shot, the whole tile has to come off and be "re-bedded" before they can even think about pointing.
- The Prep: Usually, this involves a good pressure wash. You can't stick new pointing to old dust and lichen. The surface needs to be clean and dry.
- The Application: This is where the skill comes in. They use a trowel to apply the flexible pointing in a smooth, consistent layer. It's a bit like icing a cake, but the cake is forty feet in the air and the "icing" is sticky as heck.
Can you do it yourself?
I get it—hiring trades can be expensive. If you're handy with a trowel and don't mind heights, you might be tempted to DIY your re pointing roof job. But there are a few things to keep in mind.
First, safety is the big one. Walking on a roof is a lot harder than it looks, especially if it's steep or if there's a bit of grit under your shoes. One slip and it's a long way down. Professional roofers use harnesses, rails, and specialized footwear for a reason.
Second, if you don't get the mix or the application right, you'll be doing it all over again in two years. There's a certain knack for getting the pointing to bond correctly. Plus, you have to be careful not to block the "weep holes" in certain types of tiles, or you'll actually cause more leaks than you started with.
Timing and weather considerations
You can't really do this work in the middle of a rainstorm. The pointing needs time to "skin over" before it gets wet, otherwise, it'll just wash down into your gutters and leave a giant mess. Usually, you want a clear 24-hour window of dry weather.
On the flip side, doing it in 40-degree heat isn't great either. The material can dry too fast and become difficult to work with, leading to a finish that looks a bit rough. A mild, overcast day is usually the "goldilocks" zone for roofing work.
Long-term maintenance
Once you've had your roof re-pointed, you can generally forget about it for another 10 to 15 years, depending on the quality of the products used and how harsh your local climate is. It's still a good idea to take a peek every year or so, especially after a big hail storm or particularly high winds.
Keeping your gutters clean also helps. When gutters overflow, water can back up under the bottom row of tiles, and while that's not directly related to the pointing at the top, it contributes to the general dampness that can degrade your roof's mortar over time.
Wrapping things up
At the end of the day, re pointing roof tiles is one of those boring but essential parts of homeownership. It's not as exciting as a new kitchen or a deck, but it's the thing that protects all those expensive indoor upgrades.
If you think your roof is starting to look a bit tired or you've found some "roof sand" in your downpipes, don't wait for a ceiling stain to appear. Getting it sorted early is usually a lot cheaper than waiting until you need a full roof restoration. Just find a decent local roofer who uses the flexible stuff, and you'll be set for a good long while.