Repair Systems — 03 — Facade & External Envelope
Alcore self-adhesive cavity flashing with weep formers
Supplier reference for self-adhesive Alcore cavity flashing with integral weep formers for masonry facade remediation on Class 2 strata buildings. Bonded installation eliminates mortar hold-down dependency — integral weep formers provide drainage outlet geometry in a single installation step.
What is self-adhesive cavity flashing with integral weep formers?
Self-adhesive cavity flashing with integral weep formers combines a bitumen-aluminium composite cavity flashing with a factory-applied self-adhesive backing and weep outlet geometry. The self-adhesive backing bonds the flashing directly to the substrate, eliminating the need for mortar hold-down, while integral weep formers provide the required AS 3700 drainage outlets in a single installation step.
Product Reference
3 products — 3 suppliers — self-adhesive cavity flashing with weep formers — scroll to view all
Alcore Australia — Self-Adhesive Cavity Flashing with Integral Weep Formers
Self-adhesive bitumen-aluminium composite with integral weep formers
System Description
Alcore's self-adhesive range with integral weep formers combines the bitumen-aluminium composite flashing with factory-formed weep outlet geometry. The self-adhesive backing bonds the flashing to the lintel or masonry substrate, eliminating the need for mortar hold-down or separate fixing. Integral weep formers are spaced at 450mm centres in the standard product — complying with AS 3700 in a single installation step. Substrate must be dry, clean, and primed as per Alcore's recommendations before peeling and pressing the backing. Do not install below 5°C or above 35°C ambient temperature. Lap all joints a minimum of 100mm and seal with compatible tape — the self-adhesive layer does not replace lap sealing tape.
Technical Properties
- Construction: aluminium foil + bitumen + self-adhesive layer — peel-back backing paper for bonded DPC installation
- Integral weep formers at 450mm centres — AS 3700 compliant in one installation step
- Available widths: 200mm, 300mm, 450mm — roll lengths 10m, 20m
Limitations
- Substrate must be dry, dust-free, and primed — adhesion will fail on damp, dusty or contaminated surfaces
- Do not install below 5°C or above 35°C ambient temperature
- Self-adhesive layer does not replace lap sealing tape — all joints must still be lapped 100mm and taped
PROCUREMENT SOURCES
Confirm suitability with the current manufacturer TDS before specifying or applying.
Proofex / Tremco Illbruck — Self-Adhesive Cavity Flashing with Weep Former Provision
Self-adhesive bituminous composite cavity flashing — waterproofing specialist brand
System Description
Proofex (now Tremco Illbruck) supplies self-adhesive bituminous cavity flashing systems through waterproofing specialists and building products distributors. Confirm current product TDS before specifying — Tremco Illbruck's product range has changed following acquisitions. Weep former provision varies by product — confirm whether weep formers are integral or must be installed separately at ordering stage. Substrate must be dry, clean, and primed per manufacturer's TDS before application.
Technical Properties
- Construction: bituminous composite — self-adhesive backing
- Weep former provision: confirm with current product TDS — may be integral or separate depending on product variant
- Distribution: waterproofing specialists and building products distributors
Limitations
- Confirm current product TDS before specifying — Tremco Illbruck product range has changed following acquisition of Proofex
- Waterproofing specialist distribution — not available through standard building materials merchants
- Weep formers may not be integral — confirm at time of ordering whether separate installation is required
PROCUREMENT SOURCES
Confirm suitability with the current manufacturer TDS before specifying or applying.
Grace Construction Products — Perm-A-Barrier Cavity Wall Flashing
Self-adhesive cavity wall flashing membrane — waterproofing grade — engineer specified
System Description
Grace Construction Products (now GCP Applied Technologies) supplies self-adhesive cavity wall flashing membranes for bonded DPC and flashing applications. The Perm-A-Barrier range and equivalent products provide waterproofing-grade self-adhesive performance, and are typically specified by engineers for high-specification or complex cavity wall applications. Weep formers are typically separate — not integral to the membrane product — and must be installed at 450mm centres per AS 3700. Confirm current product availability for the Australian market and applicable TDS before specifying.
Technical Properties
- Construction: self-adhesive waterproofing membrane — Perm-A-Barrier or GCP equivalent product
- Waterproofing-grade self-adhesive performance — higher specification than standard bitumen-composite flashing
- Distribution: waterproofing specialists and engineer-specified supply chains
Limitations
- Confirm Australian product availability with GCP Applied Technologies before specifying — not all Grace products are stocked locally
- Weep formers are typically separate — not integral to the membrane product — install at 450mm centres
- Higher cost than Alcore products — justified for high-specification or engineer-specified applications only
PROCUREMENT SOURCES
Confirm suitability with the current manufacturer TDS before specifying or applying.
System Comparison
Side-by-side comparison of self-adhesive cavity flashing with weep former products. Confirm all product selections against the current manufacturer TDS before specifying.
| Supplier | Product | Adhesive type | Weep formers | Distribution | Key feature | Primary use |
|---|---|---|---|---|---|---|
| Alcore Australia | Self-Adhesive + Weep Formers | Bitumen self-adhesive | Integral — 450mm ctrs | National — Alcore distributors | Integral weep formers — one step | Bonded DPC — standard and remedial |
| Proofex / Tremco Illbruck | Self-Adhesive Cavity Flashing | Bituminous self-adhesive | Confirm with TDS | Waterproofing specialists | Waterproofing specialist brand | Bonded DPC — confirm TDS |
| Grace / GCP | Perm-A-Barrier / equivalent | Self-adhesive membrane | Separate | Waterproofing specialists | Waterproofing-grade adhesion | Engineer-specified / high-specification |
Do not confuse self-adhesive Alcore with:
- Standard Alcore bitumen-aluminium composite — non-adhesive roll form, weep formers are separate — listed on the bitumen-aluminium composite page
- Alcore polyester-reinforced composite — non-adhesive, reinforced grade for wide cavity and parapets — listed on the polyester reinforced composite page
- Self-adhesive flashing tape — a narrow jointing tape, not a structural flashing — not a substitute for cavity flashing
- Substrate priming — self-adhesive products still require correct surface preparation and primer — adhesion failure is the most common installation defect with self-adhesive flashings
- Lead flashing — self-sealing at laps by mechanical compression, different material — listed on the cavity flashing — lead page
Disclaimer
This page provides general technical information only. Flashing type, surface preparation, primer, lap detail, and weep former spacing must be confirmed by a qualified remedial practitioner against project-specific conditions and AS 3700.