Penetration flashing collar systems — failed flashings

The Deks D-1 Multi is Deks Industries' primary penetration flashing collar for vent and soil pipe penetrations through pitched tiled and metal roofs. It is the most widely specified penetration collar for standard residential and strata roofing penetrations in Australia. The D-1 Multi features an EPDM rubber flexible body that accommodates a range of roof pitches without requiring the collar to be pitch-specific — the flexible skirt conforms to the roof surface at installation. The EPDM collar body fits over the pipe and is compressed to form a watertight seal at the pipe — no sealant is required at the pipe-to-collar junction. The lead-free aluminium base flange laps under the surrounding roof tiles or sheets and is fixed to the roof deck through the flange. Available in a range of sizes to suit standard nominal soil pipe and vent pipe diameters. The D-1 Multi is suitable for both tiled and metal (corrugated iron and trapezoidal profile) roofs. On tiled roofs, the base flange seats under the surrounding tile courses. On metal roofs, the flange is sealed to the roof sheet with the appropriate sealant. Confirm the correct size against the pipe's outside diameter before ordering — do not assume nominal diameter matches actual pipe OD. Confirm suitability with the current Deks TDS before specifying.

The Deks 45 is a penetration flashing collar from Deks Industries designed for pitched roofs with angles up to 45 degrees. Unlike the D-1 Multi which uses a flexible EPDM skirt that conforms to the roof surface, the Deks 45 has a rigid aluminium base flange that is angle-formed at manufacture to suit the specific roof pitch. The rigid flange seats flush against the roof surface on steeper pitches, providing a more stable base than a flexible collar on high-pitch roofs. The Deks 45 is appropriate for roofs that are steeper than the recommended range of the D-1 Multi or where a rigid flange base is preferred for the roof profile. The EPDM body provides the compression seal at the pipe — no sealant is required at the pipe-to-collar junction. Available in a range of sizes for standard nominal pipe diameters. Suitable for tiled and metal roofs. On metal roofs, confirm sealant compatibility at the flange-to-roof interface with Deks before ordering. Confirm the correct size against the pipe's actual OD before ordering.

The Deks Poly Multi-Pitch is a penetration flashing collar from Deks Industries with a UV-resistant polypropylene body rather than EPDM rubber. The polypropylene collar is flexible across a range of roof pitches, provides a lighter-weight alternative to EPDM collars, and is UV-stabilised for long-term exposure in the Australian climate. The Poly Multi-Pitch is suitable for standard round pipe penetrations on tiled and metal roofs. The collar seals to the pipe by compression and the base flange laps under tiles or seals to metal roof sheets. On tiled roofs, the collar is installed in the same manner as the D-1 Multi — flange under tiles, collar over pipe, no sealant at pipe-to-collar junction. On metal roofs, confirm sealant compatibility at the flange-to-sheet interface with Deks before installing. Available in a range of sizes for standard nominal pipe diameters. Confirm actual pipe OD against available collar sizes before ordering. The Poly Multi-Pitch is a practical alternative to EPDM collars where a lighter-weight polypropylene collar is preferred by the roof plumber or specified by the contractor.

Polyplas Industries is an Australian manufacturer of pre-formed penetration flashing collars and the Poly-I-Flash is their primary roofing penetration collar product — an alternative to the Deks range for standard round pipe penetrations through pitched tiled and corrugated metal roofs. The Poly-I-Flash uses an EPDM rubber seal at the pipe interface and a polypropylene base body, providing a combined rubber-seal-and-polypropylene-base collar that offers the UV resistance and rigidity of polypropylene with the watertight pipe compression seal of EPDM. The multi-pitch collar body is flexible across a range of roof pitches without requiring a pitch-specific product. The base flange seats under the surrounding tile courses on tiled roofs, or is sealed to the roof sheet on corrugated metal roofs. Available in a range of sizes for standard nominal pipe diameters. Confirm actual pipe OD against available collar sizes before ordering. Polyplas product may offer better regional pricing or availability in some markets compared to Deks — confirm current availability and pricing with Polyplas before specifying as the alternative to Deks for a project.