Thanks for sharing that question about your access door to under the house. There are a few ways to fix the hatch to the masonry wall, you can use adhesives, masonry screws or a combination of wall plugs and screws. It of course depends on the condition of the hatch and the masonry we are attaching to. As my colleague suggested a few pictures of the hatch and wall would be very handy. It will allow our members to assess its condition. We can then make recommendations on how to proceed.