[Stuart R]

Hello,

Thanks for your thoughts, there's a few ideas there. I don't think I'll be able to raise the floor any more than 4-6". I'm hoping they don't like the taste, so a squirt of expanding foam around the edges might keep the small creatures out of the base. I was thinking maybe I'll lift the original OSB floor and coat the underside with a bitumen paint or similar in an effort to make it less pleasant for nibbling rodents. Then re-lay it and cover with a membrane before laying beams, Celotex and a false floor on top. If I can fold the edges of the membrane upwards and stick to the sidewalls, surely that'll help stop the damp rising?

I can see that a timber frame around the walls might be un-necessary for most of the shed but it'll give a sturdy frame for future shelving - which is bound to be required in the future.

This could take a while.....

Regards,

SR