Hydroprufe Tophat

Pre-formed Tophat Pieces

Product Documentation


HYDROPRUFE TOPHATS are pre-formed units designed for the effective sealing of pipes and surface penetrations through damp-proof and gas-proof membranes. They are available in a range of standard sizes and specific sizes may be fabricated to order.


HYDROPRUFE TOPHATS should be used to seal around all pipes, ducts and service penetrations through membranes where an effective gas and watertight seal is important.

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  • Preformed units for ease of detailing around the circumference of penetrations.
  • Effective barrier to ground moisture and ground gases.
  • Maintains the integrity of the seal around difficult junctions.

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