The School where I work wants to hire several marquees to temporarily house groups of pupils. The idea is that the same group (bubble) will use it for a few days and then another group will come and use it. My question is what level of sanitisation would be recommended between the groups? Obviously we will wipe down furniture (table tops etc) but would fogging me recommended, or washing the walls? or does this seems unnecessary?

Yes thanks, that document is my bible.

We are not swapping groups in normal classrooms. .A single bubble uses it all the time. The marquees are to try and give at least a couple of days schooling to the other year groups before the end of the academic year.

Having said that, no way will we be fogging classrooms over the summer in preparation for September so it does seem a bit odd to me.

Yeah, fogging is very much a 'cherry on the top' approach to hygiene. My take is that it can't replace effective two stage cleaning and is, regardless, not reliable at dealing with vertical surfaces.

How are you intending to validate the fogging process? If you are going to spend that sort of money you need to be sure it works.

I am assuming that you would open it up AFTER fumigating it. The hydrogen peroxide should breakdown not long after it has been applied so it will not leave any harmful residue. But the process of creating the fog is very temperature and humidity dependent.

The marquees will obviously be on either school fields or playgrounds / car-parks - dosing chemicals through run-off, spillage or tipping a bucket down the drain to ground water / rainwater sewers is against Environmental Regulation in the UK.

Personally I think you are going OTT considering washing down the walls with disinfectants the canvas or plastic may not be compatible with the planned agent resulting in damage claims from the hire company.