What Is a Chimney Cricket and Do You Need One?

If you’ve never heard of a chimney cricket, you’re not alone. Most Kansas City homeowners have no idea these little structures exist until a chimney inspector mentions one during a routine checkup. Then suddenly you’re wondering whether you need one, what it does, and how much it’s going to cost.

Let’s clear this up right now.

What Exactly Is a Chimney Cricket?

A chimney cricket is a small peaked structure that sits on your roof right behind your chimney. It looks like a miniature roof itself, with two sloped sides that meet at a ridge. The whole point of this thing is to divert water around your chimney instead of letting it pool up behind it.

Think of it like a water deflector. When rain comes down on your roof, it naturally flows downward following gravity. But your chimney is this big obstacle sticking up through your roofline, and water hits the back of it and has nowhere to go. Without a cricket, that water just sits there, slowly working its way under your flashing and into your home.

You might also hear them called saddles, which makes sense when you see one. The peaked shape does kind of look like a saddle sitting behind your chimney.

Why Kansas City Chimneys Need Extra Protection

Here’s the thing about our weather in Kansas City. We get absolutely pounded with rain in spring, then we swing into humid summers, and then winter hits with freeze-thaw cycles that’ll destroy just about anything. That standing water behind your chimney? It freezes, expands, thaws, and repeats all winter long.

This constant cycle breaks down even the best flashing over time. The metal separates from the chimney or the roof deck. Small gaps become bigger gaps. And suddenly you’ve got water running down the inside of your chimney or dripping into your attic.

I’ve seen Kansas City homes with serious water damage that could’ve been prevented with a simple cricket installation. We’re talking rotted roof decking, damaged ceilings, even mold issues in the attic space. All because water kept pooling behind a chimney for years.

Do You Actually Need One?

Not every chimney needs a cricket, but most do. The general rule is that any chimney wider than 30 inches needs one. But honestly, I’d recommend them for even smaller chimneys in certain situations.

If your chimney sits on the lower portion of a steep roof, you definitely want a cricket. That’s because you’ve got a lot of water flowing down from above, and it’s all slamming into the back of your chimney with significant force. The steeper the roof, the faster the water moves, and the more pressure it puts on that area.

Wide chimneys are the biggest concern though. Once you get past that 30-inch mark, the area behind the chimney becomes large enough that water really accumulates. A standard flashing job just isn’t enough to handle that much water over time.

What Happens If You Don’t Have One

Look, some houses go decades without crickets and never have issues. But you’re playing odds at that point.

The most common problem is flashing failure. That step flashing and counter flashing behind your chimney takes a beating when water constantly pools there. Eventually it develops gaps or pulls away from the chimney. Water finds those gaps, and then you’re dealing with leaks.

Roof deck damage comes next. The plywood or OSB sheathing behind your chimney stays wet. In our humid Kansas City summers, that creates the perfect environment for rot and decay. I’ve pulled back roofing material behind chimneys and found the deck completely soft and crumbling.

The chimney itself can suffer too. Brick and mortar don’t do well with constant moisture exposure. You’ll see deteriorating mortar joints and spalling bricks where the face literally flakes off from freeze-thaw damage.

How Crickets Are Built

A properly built cricket matches your existing roof structure. It’s framed with lumber, typically 2x4s, that create that peaked shape. Then it gets sheathed with plywood, covered with the same roofing material as the rest of your roof, and integrated with the chimney flashing system.

The size depends on your chimney dimensions and roof pitch. Bigger chimneys need bigger crickets. Steeper roofs require different cricket angles to properly deflect water.

Some roofers cut corners and build flat crickets, which are basically useless. You need that peaked ridge to actually move water around the chimney. A flat structure just shifts the pooling problem without solving it.

Metal crickets are another option. These are pre-fabricated from aluminum or copper and can work well for smaller chimneys. They’re faster to install but don’t always match the aesthetics of your roof as well as a properly framed and shingled cricket.

When to Add a Cricket

The best time is during a roof replacement. The chimney area is already exposed, the flashing needs to be replaced anyway, and adding a cricket is straightforward. It adds some cost to your roofing project, but not nearly as much as doing it as a standalone job later.

That said, you can add a cricket anytime. If you’re experiencing leaks around your chimney, or if an inspection reveals that you should have one, don’t wait. The longer water has access to that area, the more damage it causes. And fixing water damage costs way more than installing a cricket.

Some insurance companies actually require crickets on larger chimneys now. If you’re filing a claim for roof damage, they might insist on one being installed as part of the repairs.

What It Costs

Prices vary based on chimney size and access difficulty, but you’re typically looking at $800 to $2,000 for cricket installation in the Kansas City area. During a full roof replacement, adding a cricket might only cost an extra $500 to $1,000 since the crew is already there and the area is exposed.

Is it worth it? Compare that to repairing water damage in your attic and ceiling, or rebuilding deteriorated sections of your chimney. Cricket installation is cheap insurance against much more expensive problems down the road.

Signs You Might Need One

Water stains on your ceiling near the chimney are the obvious red flag. But you might also notice moisture in your attic behind the chimney, especially after heavy rains. Deteriorating mortar on the back side of your chimney is another clue that water’s been sitting there too long.

Sometimes you’ll see water actually pooling behind the chimney during or right after rain. If you can safely get up there and look, that’s a pretty clear sign you need better water management in that area.

Musty smells near your fireplace can indicate moisture intrusion too. Water that gets past the flashing often runs down inside the chimney structure, and you end up with dampness you can smell but might not see.

Getting It Done Right

This isn’t really a DIY project unless you’ve got serious roofing and carpentry skills. The cricket needs to be properly framed, the flashing has to integrate correctly with both the cricket and the chimney, and everything needs to be weatherproofed. Mistakes mean leaks, and leaks mean the whole point of the cricket is defeated.

When you’re getting quotes, make sure the contractor specifies a peaked cricket, not a flat saddle. Ask about the framing method and how they’ll integrate it with your existing flashing system. A good contractor should be able to explain the whole process clearly.

If you’re in the Kansas City area and wondering whether your chimney needs a cricket, we can take a look and give you an honest assessment. Sometimes you need one, sometimes you don’t. But either way, it’s better to know before water damage becomes a bigger problem than it needs to be.