One of the decisions you will need to make when buying a Porta-Blast system is what type of floor to sit it on.
If there is an existing concrete floor then the facility can be placed onto that.
If the Porta-Blast is to be used on a temporary work-site there are several options to choose from and each has its own merits.
Always bear in mind his is a temporary facility and structure. It is not designed to be a permanent set up. There will be no permanent guttering and drainage.