Is this an expansion joint slot or not,fill it?

I have small 4 cm high , 5 cm deep side hole at end of partying wall at front, is this an expansion joint slot or not. Some people say it is, some say it is not, some say fill it, some say you must do not fill it. I have no idea .
I wanted to paste the picture here ? but where

Advice from 6 local tradespeople

No it’s 100% not an expansion joint.
Expansion joints are used on long flanks of brickwork over 10m and will go from dpc up to roof plate.

It’s not an expansion joint


To determine whether the slot in question is an expansion joint slot and whether it should be filled, I need a bit more context. Here are a few steps you can take to identify and decide on the proper action:

Visual Inspection: Expansion joint slots are typically designed to accommodate the expansion and contraction of materials (e.g., concrete) due to temperature changes. They often have a specific look, sometimes with a flexible material inside.

Documentation: Check any construction or architectural drawings and documents. These should indicate the presence of expansion joints and their locations.

Purpose and Location: Consider the location and purpose of the slot. If it is in a large concrete slab, especially in an outdoor or temperature-variable environment, it is likely an expansion joint.

Consult Professionals: If unsure, consult with a structural engineer or construction professional. They can provide definitive answers based on their expertise.

If the Slot is an Expansion Joint:
Do Not Fill: Expansion joints are meant to remain unfilled to allow for movement. If they need to be sealed, use a flexible sealant designed for this purpose.
If the Slot is Not an Expansion Joint:
Fill It Appropriately: Depending on the material and location, fill the slot with the appropriate filler material. For concrete, this might be a concrete patch compound or epoxy.
If you have a picture or specific details about the slot, I can provide more tailored advice.

No, an expansion joint runs vertically through the height of the house. An expansion joint is installed to allow movement and prevent cracking in a superstructure

It is not a expansion joint
fill it in to stop rodents and insects nest etc

it is not a expansion joint nor anything like that
it will need filling to keep rodents and vegetation out

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