MASC - Gutter Seam System for Waterproof Metal Gutters, Clamp, Nanofil Seam Insert & Sealing Rivets, Selectable Variants

✔ Watertight gutter joints in no time – No soldering, completely weather-independent
✔ Professional system in a set or individually – Gutter seam clamp, Nanofil seam insert & sealing rivets
✔ Permanently elastic & self-welding – Extremely durable for decades
✔ Enormous time and cost savings – Immediately functional after processing
✔ Universally applicable – Perfect for half-round metal gutters of all common building materials 

Perfect gutter connection professionally for plumbers & roofers

The MASC - Gutter Seam Clamp & Seam Insert (Nanofil) is the innovative system solution for plumbers, roofers, and tinsmiths for the efficient production of absolutely watertight joints on half-round metal gutters. Forget about time-consuming soldering in all weathers: With the professional combination of the nickel-plated gutter seam clamp and the highly elastic Nanofil sealing insert, you can create precisely fitting, tight, and mechanically extremely stable connections in no time at all.

Especially for demanding projects in roofing technology, this professional tool from MASC ensures consistent, craftsman-like results and maximum safety on the construction site.

All MASC system variants and components at a glance

So that you are perfectly equipped for every gutter and every construction site size, the MASC system is available in the following versions and individual components:

1. MASC Gutter Seam Clamp 33 (Art. No. RNZ33)

• The solution for large gutters: This nickel-plated special clamp has a movable jaw and is precisely dimensioned for 33-size gutters (6-part). It ensures the optimal pre-tensioning of the gutter seam before riveting.

2. MASC Gutter Seam Clamp 28 (Art. No. RNZ28)

• The solution for standard gutters: Identical in construction to the large version, but perfectly matched to 28-size gutters (7-part). Also high-quality nickel-plated and equipped with a movable jaw for maximum precision.

3. MASC Gutter Seam Set (Art. No. RNS)

• The practical combi-pack: Ideal for a quick start or smaller projects. The set contains 1 roll of Nanofil seam insert (6 m) and 200 pieces of the matching stainless steel sealing rivets (3.2 mm).

4. MASC Nanofil Seam Insert (Art. No. NE)

• The heart of the seal: A 25 mm wide sealing insert on a 6-meter roll. The ready-to-use, non-reactive material remains permanently elastic, age-resistant, and self-welding for decades.

5. MASC Sealing Rivets (Art. No. DNE32)

• For mechanical hold: High-strength rivets made of stainless steel (3.2 mm) in a practical 200-piece pack. They ensure the permanent contact pressure of the gutter connection through the sealing insert.

Work efficiently and save time on the roof

With the MASC gutter seam system, you process gutter connections significantly faster and more flexibly than with traditional methods such as soft soldering. The simple, mechanical handling ensures:

✔ Complete weather independence (processing also possible in cold or damp conditions)
✔ No heat generation (ideal for pre-coated or sensitive gutters)
✔ Immediate function without cooling or drying times
✔ Enormous cost savings due to reduced working time on site 

Versatile & environment-friendly for every project

The Nanofil seam insert is a real all-rounder in metalworking supplies:

• Material compatibility: Excellent compatibility with most metallic building materials and materials.
• Resistance: Absolutely age-resistant, weather-resistant, UV-resistant, water- and vapor-tight as well as volume-stable and solvent-free.
• Sustainability: Physiologically harmless, environmentally friendly and practically infinitely storable.

Ideally suited for:

• Half-round metal gutters in new construction & old building renovation.
• Secure gutter connections in snowy or windy regions.

Application & professional tip for the construction site

The correct application:

1. Glue the Nanofil insert to the inside of the cleaned gutter, peel off the cover strip and join the gutters.
2. Securely pre-tension the seam with the silver MASC gutter seam clamp.

Rivet the connection with the stainless steel sealing rivets at intervals of 20 to 25 mm directly through the sealing insert. Important: Always start at the gutter bead, make only one drill hole and rivet immediately.

💡 Plumber's tip:

For easily visible gutters, place the seam directly in the support area and set the rivets just next to the gutter support. When using the gutter seam clamp, attach or push the gutter support only after the seam has been fully formed. For a flawless finish, the rivets can then be treated with a matching paint pen.

Why the MASC Gutter Seam System is a must-have

The great advantage lies in the unbeatable combination of economy, durability, and easy installation. You achieve permanently tight gutter joints with minimal tooling effort and become completely independent of the weather.

You can get the original MASC system components in the well-stocked roofer shop at your Roof specialist Roofify – for professional plumbing work at the highest level.

The MASC Gutter Seam Clamp & Seam Insert (Nanofil) is a mechanical system for plumbers, roofers, and tinsmiths to create watertight joints on half-round metal gutters without soldering. Depending on the task, clamps, seam inserts, sealing rivets, and a set are available as coordinated system components.

Key Features and Technical Data

• Gutter sizes: Gutter seam clamps for 28-size gutters (7-part) and 33-size gutters (6-part).
• Clamp construction: Nickel-plated version with movable jaw for pre-tensioning the gutter seam before riveting.
• Seam insert: Nanofil sealing insert, 25 mm wide, on a 6-m roll.
• Seam insert properties: Non-reactive, permanently elastic, self-welding, age-resistant, and UV, water, and vapor-tight.
• Sealing rivets: Stainless steel, 3.2 mm diameter, 200 pieces per pack.
• Set equipment: The set contains a 6-m roll of Nanofil seam insert and 200 stainless steel sealing rivets with 3.2 mm diameter.

Comparison, What distinguishes this product

Recommended areas of application

• Production of gutter joints on half-round metal gutters in new construction.
• Renovation work on existing gutters, where a mechanical connection without soft soldering is required.
• Construction site deployments in cold or damp conditions, when soldering is impractical due to weather conditions.
• Work on pre-coated or heat-sensitive gutters where no heat should be introduced.
• Gutter connections in snowy or windy regions, where a mechanically secured seam is required.

Frequently Asked Questions