M3 y M4 Fire-Resistance Classification

Details: Published: 01 December 2010

A material’s reaction to fire expresses its aptitude to burst into flame and thus contribute to the start and spread of a fire.

France has “M” classification, with 6 categories (from 0 to 5), defining material reactions to fire.

The following table gathers fire classifications depending on the dimensions of the exposed part of tiles and the tiles per se (40 cm. or 60 cm.):

Tiles	40 cm		60 cm
Exposed Part	> à 13 cm	> à 18 cm	18 cm	16 cm
Fire Classification	M4	M4	M3	M3

40 cm. tiles

The following figure shows a cross-section of wooden tile roofing having M4 classification.

Installation is by triple-covering or layering.
The exposed part of the tile is greater than 13 cm. (16 cm.).

60 cm. tiles

The following figure shows a cross-section of wooden tile roofing having M3 (CSTB Document N°RA99241) classification.

Installation is by triple-covering or layering.
The exposed part of the tile is greater than 18 cm.

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