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  • Base doble de hormigón para aspirador estático, resuelve dos tiros de 31 x 31 cm en una sola pieza - Vetonek
  • Base doble de hormigón de 125 x 65 cm para aspirador estático de chimenea, sin junta central - Vetonek
  • Base doble de hormigon color gris ciment con dos aberturas rectangulares instalada sobre el tejado de tejas de una masia rural de piedra, cielo azul con nubes suaves
  • Base doble de hormigon color blanco con dos aberturas rectangulares instalada sobre el tejado de teja curva de una villa mediterranea, jardin con palmeras desenfocado al fondo, luz de mediodia
  • Base doble de hormigon color gris ciment con dos aberturas rectangulares instalada sobre el tejado plano mojado de un atico urbano bajo lluvia ligera, edificios de fondo desenfocados, ambiente nublado
  • Base doble de hormigon color blanco con dos aberturas rectangulares instalada sobre el tejado metalico oscuro nevado de una cabana de montana, pinos nevados desenfocados al fondo, luz de invierno
  • Base doble de hormigon color gris ciment con dos aberturas rectangulares instalada sobre el tejado plano de una vivienda unifamiliar moderna minimalista, jardin con cesped desenfocado al fondo, luz de tarde calida
  • Base doble de hormigon color negro con dos aberturas rectangulares instalada sobre el tejado de teja plana de un edificio historico de casco antiguo, fachadas de piedra desenfocadas al fondo, luz calida de atardecer

Double Concrete Base for Static Chimney Cowl - Twin-Flue Installation

373,58 €
373,58 €
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Double Concrete Base for Static Chimney Cowl - Twin-Flue Installation

Double concrete base: two flues solved with a single piece

When a chimney rises with two twin ducts — one for the boiler and one for the fireplace, or two homes sharing a pillar — the usual approach is to fit two separate bases on the same top. The result is almost always the same: the two pieces end up misaligned, a joint opens up between them that has to be filled with mortar, and that joint is exactly where water starts to seep in within a couple of years. This base fixes the problem at the root: it's a single piece, 125 × 65 × 5 cm, that houses both 31 × 31 cm flues, with no central joint to seal and nothing to misalign.

✅ Key advantages

  • No central joint: both openings are formed in the same piece, with the exact spacing and square faces. There's nothing to set out on site or adjust two bases by eye on the roof.
  • Real watertightness: with no joint between the two flues, the weak point where water gets in disappears. The only joint to seal is the outer perimeter, which is much better protected.
  • Compatible with round and square cowls: whatever tower you need goes on top of each flue, round or square, depending on the look and the flue section.
  • Concrete with no internal reinforcement: acidic smoke condensates and rainwater have no steel to corrode. The piece doesn't swell, doesn't flake from corrosion and needs no maintenance.
  • Large load-spreading surface: at 125 × 65 cm it spreads the weight of both towers across the whole top, instead of concentrating it on two small supports.
  • Two finishes: White and Cement Grey, to match the brickwork or the rest of the cap.

🏗️ Recommended applications

  • Chimneys with a fireplace duct and a boiler duct on the same pillar.
  • Shared flue (shunt) between two homes in multi-family buildings.
  • Double ventilation and extraction outlets on flat or pitched roofs.
  • Renovating double chimney tops that have been leaking through the central joint for years.
  • New builds wanting to unify the cap for two twin ducts.

📋 Technical specifications

  • Piece dimensions: 125 × 65 × 5 cm.
  • Section of each flue: 31 × 31 cm.
  • Internal dimensions: 17 × 31 × 29 cm.
  • Unit weight: 67.3 kg.
  • Units per pallet: 10 (pallet weight, 689 kg).
  • Material: concrete, no internal reinforcement.
  • Colors available: White and Cement Grey.
  • Compatibility: round and square static cowls.
  • Use: outdoor, on the roof.
  • Packaging: single unit or pallet of 10 units.

🧰 Installation

  1. Check that both ducts have a section of 31 × 31 cm or less and that the spacing between their centers matches the piece. Always measure from inside the flue.
  2. Level the top of the pillar with mortar to get a continuous horizontal plane under the whole 125 × 65 cm footprint.
  3. Lift the piece with mechanical aids or with two workers: it weighs 67.3 kg and can't be handled single-handed.
  4. Bed the base on fresh mortar, centering both openings over the flue mouths, and check the level in both directions before it sets.
  5. Seal only the outer support perimeter. Don't block or reduce the section of the openings.
  6. Fit the tower for each cowl on top and let it cure for 48 hours before starting up the appliances.

📦 Available formats

  • 125 × 65 × 5 cm in White, single unit or pallet of 10 units.
  • 125 × 65 × 5 cm in Cement Grey, single unit or pallet of 10 units.

💡 Professional tip: before ordering the base, go up on the roof and measure the distance between the centers of the two flues, not just each one's section. That's the detail most often forgotten, and it decides whether the piece fits or has to be returned: if the ducts are farther apart than the base allows, there's no way to adjust it and you're back to two separate pieces. And don't use the installation as a chance to "join" the two flues internally thinking they'll draw better: two connected ducts steal draft from each other and end up sending smoke from one back into the other. Keep each flue independent all the way to the mouth.

Frequently Asked Questions

¿Por qué una base doble y no dos bases sueltas?

Porque la junta entre dos piezas independientes es el punto por donde entra el agua. Con una sola pieza no existe esa junta central y la estanqueidad la resuelve el perímetro exterior, mucho más protegido.

¿Qué tengo que medir antes de pedirla?

Dos cosas: la sección interior de cada tiro (debe ser de 31 x 31 cm o menor) y la distancia entre los ejes de ambos conductos, que tiene que coincidir con la de la pieza.

¿Sirve para aspiradores redondos o para cuadrados?

Para los dos. La base es el apoyo común; encima se monta en cada tiro la torre que se prefiera, redonda o cuadrada.

¿Puedo unir los dos tiros por dentro?

No. Dos conductos comunicados se roban el tiro entre sí y el humo de uno acaba saliendo por el otro. Cada tiro debe llegar independiente hasta la boca.

¿Cuánto pesa y cómo se sube?

67,3 kg por unidad. Requiere medios mecánicos o dos operarios; no es una pieza de manipulación individual.

¿Se oxida o hay que darle mantenimiento?

No lleva armadura de acero interior, de modo que ni los condensados ácidos ni la lluvia tienen hierro que atacar. No pide mantenimiento.

¿Cuántas entran en un palet?

Diez unidades, con un peso total de 689 kg.