WWilts Posted August 31, 2021 Share Posted August 31, 2021 Concrete to plug the openings where drains / ducts pass through external walls? Or are there better options? Link to comment Share on other sites More sharing options...
PeterW Posted August 31, 2021 Share Posted August 31, 2021 Drains have to have a lintel over and be flexible to allow for movement. Why would a rat dig in a specific area to get through a gap underground ..?? And do you have a current rat issue ..?? 1 Link to comment Share on other sites More sharing options...
DragsterDriver Posted August 31, 2021 Share Posted August 31, 2021 Steel wool. 1 Link to comment Share on other sites More sharing options...
Onoff Posted September 1, 2021 Share Posted September 1, 2021 (edited) Stainless steel "wool" pan scourers from Wilko for example. Jam in and foam in place. In my experience everything from birds to social bees and wasps will have a go at the foam potentially, I've seen it here multiple times. They just seem to sense a nice habitable cavity behind. Best is to then render over the foam. Edited September 2, 2021 by Onoff 1 Link to comment Share on other sites More sharing options...
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