Because Laying Poison Is Only Half The Battle!
Rats don’t “turn up” by luck. They get in because a gap lets them. And yes, that gap can be small. A rat can squeeze through a space of about 20mm. That’s around the width of a chunky coin.
So if you’ve been thinking, “There’s no way a rat fits there,” stop. If you can’t block gaps, you can’t win. Let’s go sort it out, properly.
Before you start sealing anything, do two quick things: remove the reason to stay and make the search simple. Rats go where food and water are easy.
Put all food in sealed tubs. That includes pet food and bird seed. Then tighten up bins and clear crumbs under appliances. This isn’t “deep cleaning.” It’s basic control.
Now grab your kit. Keep it simple:
You don’t need fancy gear. You need focus.
More info: ccs rat pest control
Do not start inside. People do that and waste time. Go outside and walk the full edge of your home, slow and close to the wall.
Use the torch along:
If you spot a gap, mark it with tape or chalk. Then move on. Don’t start sealing yet. You’re building a full list first.
A hole is obvious. But rats also leave clues. Look for these, close to gaps:
If you see fresh marks, that spot goes to the top of your list. Seal the busy doors first.
Now you seal. And you seal for real. If you stuff a hole with soft filler alone, rats may chew it out. You need a tough barrier.
This is one of the biggest ones. Pipe holes are often messy and wide.
Here’s the fix:
This exact approach, wire wool plus cement/foam, is also recommended by UK council pest advice.
Air bricks exist for a reason. If you fully block them, you can cause damp issues. So don’t do that.
Instead:
Council guidance is clear on this: cover vents with mesh, but don’t block them fully.
That tiny gap under the door? Rats love it. Fixing it is fast and worth it.
Add a door brush strip or door sweep so the door closes tight to the ground. This is also a common recommendation from UK local authority pest pages.
If the gap is uneven, don’t guess. Close the door, shine a torch from inside, and look for light. Light means space. Space means “welcome in.”
Rats don’t need a neat hole. Weak mortar can turn into an entry point, fast.
Scrape out loose bits. Refill with mortar repair. If the crack keeps moving, treat it as a bigger building issue and get it looked at. A patch on crumbling brick won’t hold.
People forget this part. Rats can climb, but they often need help to reach roof level.
Check what touches your home:
UK council guidance warns that climbing plants can help rats reach roof level and exploit weak points.
Trim back plants. Move bins away from the wall. Create space. You’re not landscaping for looks. You’re removing ladders.
In built-up areas, drains matter. Rats can use sewer lines and broken pipework to get close to buildings.
Do these checks:
Use metal covers where possible. Some pest guidance warns that plastic can be chewed.
If rats are coming through drains, a one-way device in the drain can help stop movement toward your home while still letting the drain work normally.
This is not a “maybe.” If you have repeat issues, drains must be part of the plan.
If you’ve found droppings, don’t dry sweep or vacuum them. That can push germs into the air. Government and health guidance says to avoid sweeping or vacuuming rodent urine or droppings.
Do this instead:
Keep it calm and careful. Rushing this part is how people make themselves sick.
After sealing, give it one week. Each day, do a quick check:
If signs continue, you missed an entry point or the problem is coming from a shared wall or drains. Either way, don’t keep guessing. Fixing the wrong place wastes time and money.
Here’s the honest truth. Traps and bait won’t beat open gaps. If a rat can get in, it will keep trying. Your job is to shut the doors, every single one.
If you want a professional to find the hidden entry points and seal them properly, CCS Environmental can help across London. We’ll identify how they’re getting in, block the routes, and help you keep your home protected.
Don’t wait until a small issue turns serious. Schedule your appointment now and get fast, reliable help to keep your home and garden rat-free.
A rat can squeeze through a gap of about 20mm. That’s why tiny gaps around pipes and doors matter so much.
Foam can help, but on its own it may not last if the gap is wide or exposed. A tougher method is packing with wire wool, then sealing with cement or another hard finish.
No. Don’t block airflow. Use a mesh cover and secure it properly. This keeps ventilation while stopping access.
Because you sealed one hole. Rats use multiple routes. You need a full walk-round, then seal every gap you find, not just the obvious one.
Yes, especially where there are defects, cracks, or poor covers. Drain checks and, in some cases, drain blockers can be key for repeat problems.
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