I bought a can of spray sealant to slow down the entry of large cockroaches from the outside. I sealed a gap in my kitchen where a roach made entry.
There is a gap where the kitchen drain pipe goes out.
I would like to know what are likely entry points for the roaches so I can seal them up.
Thanks.
"I would like to know what are likely entry points for the roaches"
All of them. You've got gaps around the water inlets and around the drain, and gaps further to the left where panels are casually joined. Fill them, then start looking wider: i.e. for gaps between the floor and wall etc.
God designed cockroaches to pack flat :-)
Electric outlets are a common point of entry for cockroaches, large and small.
So are the holes in walls for water pipes, sewer pipes, and natural gas pipes.
Under door thresholds is another common entry point.
You might have a infestation behind the wall where they live and multiply.
They will search for any entry point to get to the food.
Just seal them all for now, if need be call a terminator
The best way to keep any bug out of the house is to prevent them from coming in. Treat the outside of your house by spreading a granular insecticide. Granular is much better than spraying.
This puts up a barrier that bugs don't want to crawl over. However if there is an infestation in the walls, as DIY75 mentioned, you will need to address that with interior extermination.
You can spray the house so they die when they get in, and spray the outside so they aren't trying. But thinking you can seal them out is a fools errand.
