Auto Caulk Flashings
Die-formed roof flashings with EPDM rubber collars, available galvanized, aluminum, or copper for plumbing vent penetrations.
Overview
Die-formed roof flashings with EPDM rubber collars, available galvanized, aluminum, or copper for plumbing vent penetrations.
Mayco’s Auto Caulk Roof Flashings have a flexible seal and are die-formed to flashings. You can get them as Galvanized, Aluminum, or Copper. The EPDM rubber collars make them completely waterproof and leak-proof. They fit up to a 40 degree roof pitch and come in four sizes: 1-1/2”, 2”, 3”, and 4”. We also offer two space-saving combo sizes: 1-1/2”, 2”, the 3-in-1 combo, and the 3-in-4 combo (see table below). Copper auto-caulks are only available in combo sizes. “Collars Only” available in combo sizes for quick and easy repairs.
Super Neo-poly The Super Neo-poly is available in 1-1/2″, 2″, 3″, and the 3-in-1 combo. It fits up to a 15/12 pitch (51°) with a polypropylene base and an improved elastomer collar. However, it is not for hot-mopped or built-up roof applications. View Super Neo-poly Flashing Details (PDF)
Traditional Neo-poly This comes in 4″ and 3/4″ combo sizes. The injection-molded polypropylene base has a melt flow rate of 14 and a notched Izod score of 11. That makes for superb impact resistance. Also, we mold a thermoplastic rubber collar onto the base, making a one-piece permanent bonding of the materials. And it fits roofs of up to a 45 degree pitch
Typical applications
Where this product is engineered to perform.
Plumbing vent penetrations on flat and sloped commercial roofs
Multi-pitch roofs up to 15/12 pitch (51°)
Commercial and residential weatherproofing seals
Long-term ultraviolet and thermal degradation resistance
Industries served
Product specifications
| Available Vent Diameters | 1-1/2” | 2” | 3” | 4” | 3-in-1 Combo (1-1/2”, 2”, 3”) | 3-in-4 Combo |
|---|---|
| Galvanized Base Sizes | 8.75” x 12.625” (1-1/2”, 2”) | 10.75” x 14.5” (3”, 3-in-1) | 11.75” x 15.5” (4”, 3-in-4) |
| Aluminum Base Sizes | 8.75” x 12.625” (1-1/2”, 2”) | 10.75” x 14.5” (3”, 3-in-1) | 11.75” x 15.5” (4”, 3-in-4) |
| Copper Base Sizes | Combo sizes only: 10.75” x 14.5” (3-in-1) | 11.75” x 15.5” (3-in-4) |
| Super Neo-poly Sizes | 8.875” x 11.75” (1-1/2”, 2”) | 10.75” x 13.625” (3”, 3-in-1) — fits up to 15/12 pitch (51°) |
| Traditional Neo-poly Sizes | 11.75” x 15.5” (4” and 3-in-4 combo) — fits roofs up to 45° pitch |
| Collar Material | EPDM waterproof elastomer collar (also available as Collars Only) |
| Pitch Capability | Standard metal models fit up to 40° roof pitch; Super Neo-poly fits up to 51° |
Specifications subject to custom engineering and alloy options. Contact Mayco engineering for specific sizes, tolerances, and custom certifications.
Need a custom size, alloy, or configuration?
Mayco provides engineering support and design consultation — from small radiation shielding jobs to large ballast projects. Our team can help specify the right product, dimensions, and tolerances for your application.
Every Mayco product is manufactured in-house across our U.S. plants and backed by our ISO 9001 quality system.
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