Intumescent Wrap Strip WS1
Select the appropriate UL or ITS Warnock Hersey listing for application criteria.
Clean the surfaces of the penetration and substrates. Remove all dust, dirt, water and oil.
Place the number of WS1 wrap strips around the penetration as required by the listing. These
strips should be installed in one continuous tight wrap around the pipe to fill the annular space.
Secure the prepared wrap strip layers in place by using foil tape or steel tie wire.
Slide the prepared wrap strips into the annular space and into the assembly to the required depth.
If specified in the listing, install the required amount of firestop caulking (4800DW) where
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