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Figure 3.12.1 : Fire stopping to a pipe in a compartment wall

Fire stopping is concerned with ensuring that the fire-resisting capability of a component, i.e. separating wall, compartment wall/floor, cavity barrier is not diminished or impaired when penetrated by services for example, a pipe, ducts, etc..

Therefore, whenever gaps are created by the penetration of such pipes, ducts in the fire-rated wall/floor, they must be kept as few as possible. The spacing and internal diameter of pipes passing through any elements of structure or cavity barrier shall comply with Cl.3.9.3 and Table 3.9A.

( No illustration )

To prevent displacement, materials used for fire stopping should be reinforced with (or supported by) materials of limited combustibility in the following circumstances:

a. in all cases where the unsupported span is greater than 100mm, and

b. in any other cases where non-rigid materials are used (unless they have been shown to be satisfactory by test)

Preference should be given to proprietary fire stopping and sealing system.

When cement mortar or gypsum board plaster or cement or gypsum based vermiculite/perlite mixes is used as fire stopping material, care should be exercised to ensure that workmen properly fill up the entire gaps with the appropriate fire stopping material instead of carrying cosmetic application by just filling up the gaps superficially.