To suitably fire stop pipe penetrations through Siniat systems, the recommendation is that these must be in line with guidance in the latest revisions of Approved Document Part B (Section 9) of the Building Regulations and with the fire stopping manufacturers tested system. 

Within Approved Document B (2019 edition with amendments up to 2022), the recommended option is to fire stop using a proprietary tested system as per Alternative A (shown below). 

Alternative B can be considered where a proprietry system is not used. Our interpretation of this is for pipes below 40mm diameter above ground then the opening should be kept as small as possible and sealed using an appropriate fire stop around the pipe (Siniat Intumsecent Acoustic Sealant). The choice of product must be checked and confirmed with the pipe / cable manufacture to ensure they are compatible. Please note, Siniat Intumescent Sealant is not suitable for use with cPVC pipes. This fire stopping approach and method should be checked and approved by the project fire consultant to ensure that all site requirements are being met and are in line with the project fire strategy.

Please note that some Radiator manufacture recommend and have tested baffle box solutions for use with their systems, we would strongly recommend that the relevant radiator manufacture is contacted prior to construction to check what their tested solution or detail is for these scenarios.

Extract below (section 9) taken from Approved Document B 2019 Edition including amendments up to 2022: