[middy]

Hi everyone. I have taken the plunge and bought a pool pump cover to serve as an observatory after some inspiration from Richard the other week. I have managed to assemble it despite some errors in the instructions.

My problem at the moment is how to seal the base to stop rain getting in. The slab was an existing slab when I moved in to the house and, to be honest, whoever laid it did a terrible job. It is uneven resulting in gaps under the shed in several places. The largest gap is about 10 mm.

Does anyone have any suggestions on the best way to seal around the base before I bolt it down? I have attached a pic showing the largest gap.

cheers,
Andrew