ACO Threshold Drain

Drainage channel for domestic thresholds

• Contemporary-style finish: Sleek horizontal inlets provide a sleek, contemporary threshold drainage solution. 
• Threshold protection: Prevents water ponding and ingress with level thresholds. 
• Finish your threshold: Select from silver or black aluminium, stainless or CorTen steel gratings.
• Ample accessories: Full range to facilitate installation flush with doorstep and to connect to onward drainage. 

ACO Threshold Drain with either a silver (19000) or black (19005) aluminium grating is ACO’s entry-level threshold drainage solution. The anodised aluminium grating provides a durable yet cost-effective option. The contrasting silver and black options allow the sleek, contemporary-look grating to stand out or blend in against darker or lighter paving tones.

The channels across the ACO Threshold range are made from light-weight yet robust extruded polypropylene and come with a full range of accessories to contain and connect rainwater to onward drainage. All gratings are removable to facilitate channel maintenance. 

ACO Threshold Drain with a stainless-steel grating (19058) uses 316 stainless steel for the grating. 316 stainless steel has enhanced resistance in harsher conditions, for example marine environments, and so is less susceptible to corrosion pitting. Therefore the grating delivers a distinct high-end finish for threshold and smaller patio* projects.

The distinctive look of CorTen steel is a regular feature in show gardens and garden design magazines, utilised in planters, edging, trellises and moon gates. Consequently an ACO Threshold Drain with a CorTen steel grating (19012) contributes to this orange-hued aesthetic for threshold and smaller patio* projects. 

CorTen develops its characteristic rusty appearance after it has been exposed to rainwater, therefore the grate may have a smooth silver-grey appearance when first delivered. Over time and contact with rainwater the surface changes to the characteristic textured orange patina, an oxidised layer than protects the steel from further corrosion. During formation of the patina, rainwater running off CorTen steel can be brown in colour, which can stain surrounding porous surfaces, particularly lighter tones.

As with all channel drainage installations, the grating must be positioned 3-5mm below the adjacent paving level. In this way, water is directed into the channel, reducing the risk of discoloured water staining surrounding paving. When using very porous and/or light-coloured paving, it is recommended to allow the CorTen gratings to corrode in a location where staining is not a concern, and only install when the patina has fully developed.

ACO bears no responsibility for stains on paving when using CorTen gratings. In case of doubt, use the aluminium or stainless-steel gratings with this channel.

*In comparison to other ACO channel drains, ACO Threshold Drain has a lower hydraulic capacity. This must be taken into account when installing this product in patios. A 10m run of Threshold Drain could drain up to 50m² paved area during a 50mm per hour rainfall event (in accordance with the guidance in Building Regulations for England 2015 Section H3 2.4).

Threshold Drain accessories

19006 - Corner unit silver

19007 Corner unit black

19013 Corner unit CorTen

19059 Corner Unit Stainless Steel

19001 Threshold Drain Connector

19004 Threshold Drain Closing End Cap

19003 ACO SlimLine 50 mm End Cap Reverse

19011 - Threshold Drain bottom outlet

ACO Threshold Channels are supplied with a protective plastic film covering the aluminium and stainless steel gratings to prevent damage during transit and installation. Please note that prolonged exposure to UV light during storage may cause this film to deteriorate and become brittle, making it difficult to remove. We recommend storing the product in a covered or indoor location and remove protective film directly after installation.

ACO Threshold Drain enables installers to deliver an external accessible threshold as required by the Building Regulations. 

In England and Wales, Approved Document M of the Building Regulations covers access to and use of buildings. Volume 1 applies to ‘newly erected dwellings and dwellings undergoing material alteration only.’ In each of the three categories, external thresholds must have an ‘accessible threshold’, defined as ‘level or, if raised, has a total height of not more than 15mm, a minimum number of upstands and slopes and with any upstands higher than 5mm chamfered.’ In Scotland the same requirement is covered in Section 4.1.9 of the Scottish Building Standards. 

Where there is a level entry to a building, provision of threshold drainage is even more important to minimise the risk of water entering the property.  

 

• Approved Document M (England)
• Approved Document M (Wales)
• Domestic Technical Handbook (Scotland)

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