Threshold drain for bi-fold and sliding doors - Grand Designs Magazine

Keep water at bay with a flush threshold drain

Sliding and patio doors perform best with a leak-proof drainage system

Promotional Feature By Caroline Rodrigues |

A quick flick through the pages of Grand Designs magazine reveals that sliding and bi-fold doors are very much in style. As a sleek addition to large open-plan living spaces they blur the boundaries between the interior and patio, especially when indoor and outdoor surfaces are set at the same level. A flush threshold drain is the solution to creating this seamless join.

Without the correct drainage, sliding or bi-fold doors could let water in via the door tracks. If left long enough, leaks like this can cause significant damage to your home. If you’ve had this issue in the past or are fitting new doors, Aquabocci’s R-47 x Blade Threshold Drain not only promises to stop leaks in their tracks but guarantees a perfectly flush finish.

threshold drainage products come in a variety of colours

Aquabocci drainage products offer versatility and a great colour selection

What is a flush threshold drain?

A threshold drain is a linear drain that prevents the build-up of water in door tracks or under door sills. The drain is considered ‘flush’ when it allows for indoor and outdoor surfaces at the same level. Under UK regulations, surface water must be directed away from the house into a drain, and the R-47 x Blade Threshold Drain fitted beneath patio doors is ideal for this.

Leaks occur when water from heavy rainfall or another source builds up over a long period. While glazed doors are designed to repel water, they don’t help it drain away effectively. Threshold drains act as conduits so that water doesn’t have the chance to accumulate, thus preventing leaks and potentially expensive damage to your property.

threshold drain fitted to sliding door connecting indoors and out

Aquabocci R-47 X Blade Flush threshold drain achieves a completely flush finish

What are the benefits of the R-47 x Blade Threshold Drain?

The R-47 x Blade, which won a prestigious Red Dot award for design, has the following key features.

  • Effective drainage: The R-47 x Blade uses Aquabocci’s signature ‘drainage technique’ to repel and drain water as efficiently as possible. Its EPDM membrane collects water from drainage holes in your door track, allowing it to flow freely through the PVC drainage channel.
  • A flush fit: A huge advantage of using a flush threshold drain over another drainage solution is that it’s subtle. Once you install the R-47 x Blade, you won’t even know it’s there, and there’s certainly no risk of you tripping over it.
  • Customisable to your decor: The R-47 x Blade comes in GT Silver, Titanium, Black or Champagne and has a number of possible configurations, including external and internal corners, allowing you to match it to the exact shape and style of your door.
  • Corrosion resistant: Great news for pool owners! Since it’s made from corrosion-resistant material, the R-47 x Blade won’t rust, corrode, or tea-stain around saltwater or chlorine.
modern home with sliding doors connecting dining room with large terrace area

The Aquabocci R-47 x Blade Threshold Drain creates a flush finish to the balcony area

Is a threshold drain easy to install?

You don’t have to be a drainage expert to fit the R-47 x Blade Threshold Drain yourself. Installation is made easy by the drain’s PVC spigot pipe that glues to the underside of the PVC channel in the exact location of your groundwork pipes.

Find out more

Aquabocci is known worldwide for its cutting-edge, innovative drainage solutions. Find a full range of Aquabocci’s products, including swimming pool drains, wet room and shower kits, and balcony and garden drains online at or call 020 3697 1252.