Insulation

A method of providing a fire resistant layer to a support surface of a building element comprising:

• introducing a combination of first mineral wool fibres having a first composition and second mineral wool fibres having a second composition into an inlet of a spraying apparatus, the first mineral wool fibres and the second mineral wool fibres having a difference of softening point which is at least 150° C.;
• and
• projecting simultaneously the first mineral wool fibres, the second mineral wool fibres, water and a binder from a spraying nozzle of the spraying apparatus towards the support surface to provide a sprayed layer of mixed mineral wool fibres on the support surface, the sprayed layer of mixed mineral wool fibres comprising (in % by weight based on the total weight of the layer):
• the binder;
• at least 50% wt of the first mineral wool fibres;
• and
• at least 5% wt of the second mineral wool fibres;
• in which the first mineral wool fibres comprise glass wool fibres and the second mineral wool fibres are selected from the group consisting of rock wool fibres, slag wool, ceramic fibres and combinations thereof.

A method of providing a fire resistant layer to a support surface of a building element, the method comprising:

• providing a package comprising a combination of loose glass wool fibres and loose mineral wool fibres selected from the group consisting of rock wool fibres, slag wool, ceramic fibres and combinations thereof;
• introducing the content of the package into an inlet of a spraying apparatus;
• subsequently projecting simultaneously the combination of loose glass wool fibres and loose mineral wool fibres selected from the group consisting of rock wool fibres, slag wool, ceramic fibres and combinations thereof, water and a binder from a spraying nozzle of the spraying apparatus towards the support surface to provide a sprayed layer of mixed mineral wool fibres on the support surface, the sprayed layer of mixed mineral wool fibres comprising (in % by weight based on the total weight of the layer):
• the binder;
• at least 50% wt of the glass wool fibres;
• and
• at least 5% wt of the mineral wool fibres selected from the group consisting of rock wool fibres, slag wool, ceramic fibres and combinations thereof.