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Post by JohnDee » Tue Feb 01, 2022 7:58 pm
bornlivelife wrote:This is my first post and have a really difficult problem Im hoping someone might have some ideas how to help.
Have a full width single storey flat room extension on back of a semi, and there are rats in the roof. Poison put down kills them off for 2 weeks, then they return ao need permanent fix.
Have sealed all cavity walls in extension at head height and this barred them from the roof but they were still in walls. Found a loose brick below damp course in main house where it joins extension, pulled it out and found a lot of gaps between bricks where a gas pipe had been put in, so put loads of concrete in below damp course and sealed it. This barred the rats from walls.
2 weeks later they are back in roof of extension, but previous work is still perfect, ie they must have another route into the extension roof, between ceiling and flat roof. There are no external gaps in roof and the walls are all perfect above ground level. There are no holes in garden
Putting posion in drains kills the rats for 2 weeks so there is some connection between drains and flat roof
Conclusion: I think the rats are in main house (built 1959) back wall cavity which the extension (built 1991) is joined to. I think somehow the drains are connected to this cavity possibly from previous kitchen sink drain. Think they are getting into flat roof extension through hole for electric supply into roof
Questions
1. Can i seal the main house cavity wall with anything that rats will not penetrate?
2. Do i still need the air in this cavity wall, as it is not internal since extension was built?
3. Would a smoke pellet in cavity wall show me where the holes are?
4. What can I do !!
Post by blusu » Wed Feb 02, 2022 6:31 am
Post by Ratatouille » Wed Feb 02, 2022 9:20 am