Mechanical fixing of insulated plasterboard for fire safety

[garyo]

I need to fit two sheets of 50mm/12.5mm PIR backed plasterboard to the external wall of a bedroom. I'm dot and dabbing them, and also want to fit two mechanical fixings per board for fire safety. (Note - it's not actually being done under regs or being inspected).

I'm slightly confused by the number of mechanical fixing types available, especially as most seem to be made from plastic. I take it that I need the fully metal type?

i.e. I take it that these are not sufficient: http://www.ebay.co.uk/itm/Insulatio...hash=item43bb59c60b:m:mrv5_UdTejVOhdpv-HXh82Q

Whereas these ones probably are: http://www.ebay.co.uk/itm/METAL-OR-...hash=item3d10a8eb77:m:mTdA6-oFFneEOZEg2IMIBzg

Thanks

 

[^woody^]

Fire safety is not an issue on external walls. You dont need any fixings

 

[garyo]

Interesting. Why's that then - do the temperatures not get high enough to make them fall off the wall and squash people?

 

[^woody^]

Interesting. Why's that then - do the temperatures not get high enough to make them fall off the wall and squash people?

No one would be there to get squashed in a fire situation, or they would be dead already.

The principle of fire protection is that the plasterboard would be there to offer resistance to the spread of fire to another space or area. External walls already have enough resistance, so you don't need to add more, hence no fixings required to keep the plasterboard in place.