Fischer Thermax: Stop Thermal Bridges with Insulated Fasteners 2026

When you need to attach something to an externally insulated wall, you can't just screw into the cladding. You have to reach the solid structure beneath—but without creating a thermal bridge that lets heat or cold travel between inside and out. That's where Fischer Thermax comes in.

Fischer Thermax is the only thermally insulated fastening system for spaced loads, ideal for buildings with external thermal insulation composite systems (ETICS). It works in concrete, natural stone, solid brick, lightweight concrete, and hollow brick. The secret? A high-performance nylon insulating cone reinforced with fiberglass that breaks the heat flow from the metal component.

The nylon cone screws onto the rear thread of the bolt and sits flush with the plaster. You can then tap or screw M6-M8 threaded elements into it to hang objects on an insulated facade. Perfect for heavy-duty jobs like awnings, air conditioners, and satellite dishes.

For lighter loads, there's the Fischer Thermax Junior—a slightly lighter anchor with a threaded rod paired with a 10 or 12 mm nylon expansion sleeve. Ideal for venetian blinds, signs, gutters, electrical conduits, shutter stops, outdoor lamps, alarm systems, and mailboxes.

Why Avoid Thermal Bridges?

A thermal bridge is like a shortcut for energy—it bypasses your insulation, making your home harder to heat or cool. That means higher bills and less comfort. Using a thermally broken fastener like Fischer Thermax keeps the insulation layer continuous, so your energy stays where it belongs.

Installation Tips for Fischer Thermax

• Drill through the insulation and into the solid wall (concrete, brick, etc.) to the required depth.
• Clean the hole thoroughly.
• Insert the Thermax anchor and tighten until the nylon cone is flush with the plaster surface.
• For Thermax Junior, use the appropriate expansion sleeve size (10 or 12 mm).
• Attach your fixture using M6-M8 screws or threaded rods.

Common Applications

• Heavy outdoor equipment like pergola shades or grill shelters
• Mounting patio heaters on insulated walls
• Securing TV brackets or shelving on insulated interior walls
• Attaching large mirrors or wall decor without compromising insulation

FAQ

Can Fischer Thermax be used in hollow brick?

Yes, it is suitable for hollow brick (foratelli) as well as solid materials like concrete and natural stone.

What load can Fischer Thermax support?

It depends on the substrate and anchor size, but it is designed for heavy loads such as awnings and air conditioners. Always check the manufacturer's load table for your specific wall type.

Is Thermax Junior strong enough for outdoor lamps?

Absolutely. It's perfect for lighter fixtures like outdoor lighting, signs, and gutters.

Do I need special tools to install it?

No—just a standard drill with the correct bit size, a hammer (if needed for setting the anchor), and a screwdriver or wrench for the threaded elements.

Can I use Fischer Thermax on a wood-framed house?

It is designed for masonry substrates (concrete, brick, stone). For wood frames, consult a structural engineer for appropriate fasteners.

For more home improvement solutions and garden supplies, explore our full range of outdoor decor and storage sheds to complement your insulated home.

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