Download. . Stora Drain C250 25 Tonne With Steel. Step 6: Complete the installation of ACO Drain. It can be installed without the need of taking up a large amount of pavers from your. Once you have laid your concrete foundation, leave for 48 hours to dry, covering the trench if necessary to protect it from rain water. Floor area of building (m2) Minimum ventilation provision (mm2) 40. Channels are. Load Class A-C. Beechcraft St. Make sure your property is airtight and get damage fixed promptly if it occurs. Download. The DPC is not clear from the 'two bricks' photo. 20,000. Can I build an Aco drain at the DPC level or must there be a drop between DPC and the Aco drain? If so,. Please contact Technical Support at +44 345 600 9355 for assistance. French drain - Cut away pavers 6" from house, dig trench, lay geotextile, 20mm gravel and perforated pipe, knock through drain surround below ground and feed pipe into surface water gulley. With your foundations set, you can now install your ACO drain. With the increasing usage of SuDS for drainage, the role of soakaways has never been more important, so their construction and they way in which they work needs to be better understood, which is the aim of this page. I raised our patio by building a low wall 200mm out from the house (out of building blocks) to create a dry moat/French drain. Pipe a DPC cream into the holes with a caulk gun. If you was installing storm drains I would recomend that you install them lower than you dpc level and tap in to the nearest underground waste pipe so the water has somewhere to go. It can also help to prevent standing water, drain puddles that damage your grass and plants, and stop leaks from infiltrating your basement or washroom. 26 Apr 2020. Cavity trays – roll damp course material. In cases where lead is used, the lead should be at least a code four (colour code blue). freetown. I have been advised that running an aco drainage channel along the wall of the house would be sufficient. Generally a new driveway or patio area does not require building regulations approval. ACO Pty Ltd. By contrast, the Defense Contract Audit Agency, or DCAA, has the primary responsibility for monitoring and auditing the accounting systems of contractors in doing their work for the DoD. Rob Denness New Member. The DPC in the extension is the same level as the patio. Check your existing physical damp proof course (DPC), which should sit 150mm above ground level (see Fig 1 above). b) fit the Aco flush to the door which would need me to cut off the sill. CINs are led by physicians who want to assemble the resources needed to manage. Fast forward 2 years and noticed the vinyl floor had started coming away from the chipboard raised floor in the house (this was to make it all level access). See us at. Having ACO drains installed at the front of your house is a common. A line should be fixed along the length of the trench in order to determine the finished height and alignment of your drainage channel. Stick the nozzle into the hole as deep as you can and pull the trigger on the caulk gun. I have some questions around insulating below the DPC though. We offer a range of stainless steel gullies for shower, wetroom and bathroom applications. Would aco drains be reccomended at the front of the property, given the slope is away from the house or would it be sufficient to dig below the DPC and air brick then line with shingle to soak into the. By the sounds of it (steps up to the garden, drain along the side), steps have been taken during construction to avoid. Building reg's, stipulate, for new dwellings, level access must be provided at least 1 doorway. 8. 50 incl VAT. Track and field drainage systems. I intend to have the patio fall in two directions - away from the house and also towards a soakaway. Is this OK and if not is there anything I can do to. High quality ACO stainless steel channel drainage, designed. However, if your patio is directly next to the building, make sure that the design takes drainage needs into account. au. Set Bottle Gulley in desired position to join up with Aco drain, suitable bends and required pipework can be used to join the outlet up with. The level at the crown of the pipe. Also I'd gamble on the DPC spanning the cavity and causing pooling. Patio level with dpc We are wanting to raise our patio level with the french doors. Most are variations on the theme of an enclosed channel, typically with a u-shaped cross-section and some form of grating over the top. i basicaly reduced the ground level 150mm below the dpc level of the house and installed a french drain running along the rear of the house. The bridged DPC continues on around the corner of the house also. o. Northeast Office Toll Free: 800-543-4764 9470 Pinecone Dr. Multiskillmaster, Dec 3, 2019 #3. . When working on a new build basement, you should use an external waterproofing system to reduce or block the passage of water through your external earth-retaining walls. ACO Drain® – robust durable trench drains for all applications; Understanding slip resistance; ACO. I know the rule is 150mm but technically it is the top of the linear drain that is 75mm below the dpc and the ground height next to the house is well below the 150mm. we hereby give notice that on all plots starting or at DPC level as at 1st January 2023, the use. Founded in 1946, the ACO Group manufactures products for the building and construction industry. Do I:-. ACO Drain ® systems consist of factory manufactured modular channel units made from corrosion resistant Polycrete ® channels, together with grates from a variety of materials for all loading applications. . Kontakt. If the level of your driveway is above the damp-proof course (DPC) line, it can potentially cause issues with water ingress into your property. Internally I have 2 level floors but ones solid and ones wodden due to 2 rooms being knocked together. This will be flush with the patio slabs. Between the drain and wall would be a small space. In fact, we have to put an aco drain in anyway I believe in order to not leave 2 courses of engineering bricks. The mortar bed upon which the DPC is to be laid should be made level, even and free from projections. Ensure the channel discharges to a drainage system. Find us on. Kerbed edging and then a drop to the aco drain below DPC or a second grate level with driveway and above the DPC that sits on top of Aco. My conclusions so far. . ACO Multiline. In this circumstance, you should excavate to the level of walls and apply MB2K+. Building Regulations. In Greater Manchester’s Metrolink, ACO’s grooved RailDrain boxes offer a one-piece dedicated drainage point to intercept water. ACO Građevinski elementi d. Supply and erect all necessary formwork and shuttering. 0. If you decide you don’t want Medicare to give your health care information to your doctors or other providers, Medicare will continue to use your information for some purposes, like evaluating financial performance and quality of care. 4. the gap between the door and head or jamb should be a maximum of 4mm (for double doors, the gap at the meeting stiles should be within 4mm) and uniform. All ACO’s channel systems are design to integrate with other systems that address these. ACO Threshold Drain Drainage Channel with Stainless Steel Grating - 1m. The new drive way is like a L shape and continues around the side of the house. There is an enormous range available, from simple half-metre or metre-long polymer. AS101 DPC Channel. 037. The ‘strip’ should be dug out to at least the level of the bottom of the sub-base layer, or 300mm below DPC, whichever is greater. It is rare to see those on new builds now due to the difficulty in achieving the necessary U value in a floor with a ventilated void. 1 told us we need to lower the patio while the other has suggested raising the patio to dpc line and putting in an aco drain against the house!N. Drainage water is fed into catch drain by the suitable longitudinal slope in the main drain. The first thing to do is excavate a trench area at the installation site that matches the depth and width of your ACO drain and accommodates the channel and the bed. Ground and paving levels are commonly asked to. So there is a slight step, probably about 20mm. My plan was to lay a small path around the house and install ACO drainage channels next to the property but I've run into a bit of a problem. A clear cavity of at least 225mm below the DPC should be maintained. Manthorpe G930 Combination Airbrick. Diagram B20 - Rising walls - changes in level 150-800mm. Drainage requirements. A level internal to an external threshold at Foxwood. 104 in stock. ACO TramDrain 200 is a higher-capacity drainage system that is also in place in this light rail system. Used in garage thresholds, landscaping projects and a range of DIY garden and patio applications. End cap can be used with both male & female connections. 9. Mark your line. #1. It can be installed without the need of taking up a large amount of pavers from your. Issues to be taken into account include: general construction considerations. . ACO stands for professional drainage, efficient cleaning, and the controlled discharge or reuse of water. Product AS101 DPC Channel AS101 DPC Channel For drainage applications where damp proofing is required. Excavate to reduced depth of 100mm below finished level (250mm below dpc) and cart all spoil to licensed, off-site tip. It could be that the render has been applied down to the same level as the DPC, in which case the two-bricks height above the existing concrete should be fine. Rising Walls Changes in Level. Yes they should have installed the driveway 150mm below the damp course, if this was unfeasible then an aco drain should have been installed right around the house (where the dpc is compromised) and should of been connected to an existing gully for drainage. Beechcraft St. High mechanical and chemical resistance. distortion across doors should be limited to a maximum of 5mm in height, and 3mm in width. Beechcraft St. ding of the parapet should provide a clear drainage plane that redirects water away from the building and allows moisture in the form of vapor to escape from the interior. The. Northeast Office Toll Free: 800-543-4764 9470 Pinecone Dr. By having the finished external ground level 150mm below dpc, air bricks are usually at least 75mm above the ground. So we are having this outside the bifolds. So we wanted to bring the patio to about 50mm below the DPC and was thinking of using an aco drain (or linear drain). This ACO BrickSlot HexDrain is a slot drain channel drainage system that seamlessly clips together and requires no additional fixings, with a 500mm mark for an easy-cutting guide. Would aco drains be reccomended at the front of the property, given the slope is away from the house or would it be sufficient to dig below the DPC and air brick then line with shingle to soak into the. The external landing should be sufficiently large and level for ambulant disabled people and wheelchair users to be able to approach and, if necessary, turn to face the door. N. b) fit the Aco flush to the door which would need me to cut off the sill. Kanal od polimer betona za linijsko odvodnjavanje sa pokrivnom rešetkom. Tony McC Site Admin Posts: 8346 Joined: Mon Jul 05, 2004 6:27 pmACO Building Drainage Complete system for indoor drainage. System shall be frame-anchored, with grating to suit DIN Class load rating. Frames supplied with plastic snap-fit studs for connecting to fiberglass body. Installation Instructions. System inlcudes frame conenctors, grate lockdowns, and construciton covers. Department of the Air Force, and Defense agencies and activities awarded a Tailored Task Order #47QRAC18F0003 to U. In March 2021 ACO and AIT-Dialog have been successfully launching a virtual tour of the world's seven continents inviting architects, urban planners, engineers and landscape architects to become part of "beyond. Between the drain and wall would be a small space. I raised our patio by building a low wall 200mm out from the house (out of building blocks) to create a dry moat/French drain. Add 2″ to length of each channel for female joining flange (only applicable at shallowest end of trench run). Customer Sales 01753 944210. To allow water to drain out of the cavity, weepholes should be provided in the outer leaf immediately above the cavity tray and positioned at a maximum distance of 900mm centres. ) Army, U. Without seeing the job it’s hard to say if this response is accurate. We can live with 1 brick below dpc and the floors are set at dpc level. The old paving was at the same level as the DPC, that's why I think the previous owners installed the heavy duty steel trenches. + Water can drain away below DPC. DR800 ACO Drain Price List 1 of 5 (Standard Products) 2022. Sand Filling is a stage of building construction arrived once the building has reached the DPC Level. Product options. AS101 DPC Channel. ACO is a global leader in water management, with products to collect, clean, hold and release water; addressing all phases of the water cycle and supporting water sensitive urban design. Retaining wall 150mm away with an acco finishing 150mm below dpc at the the bottom - then you have a "normal" build - otherwise take your chances with polythene sheets, internal tanking etc - and don't skimp on the detail. Please note this house was built in 1810 and has no DPC. I then find the DPC on the internal block work is 100mm HIGHER than FFL and I doubt the floor has DPM under it. Lawns and landscaping are an important part of your home’s aesthetics; they catch the eye and add curb appeal as well as providing a place for family relaxation and recreation. Green, Apr 5, 2009. Labour. Layout of Drain – Plan view. 6 Drives, paths and landscaping. 4 (formerly Ch 4. This is where the damp from the ground is able to travel up past the DPC because of a construction fault. West Office Toll Free: 888-490-9552 825 W. ACO Threshold Drain comes complete with either a silver or black aluminium, CorTen steel or stainless steel Heelguard grating suitable for pedestrian traffic. Patio above DPC with Aco Slot Drain? We would like a patio built flush to our low threshold bi fold doors so the floors indoor and out flow. 27 Feb 2023. or similar approved. creating the future of drainage ACO Aquaduct The ACO group was founded in 1946. Left hand set shown. Damp Proof Course or DPC is the protective layer applied to prevent the rising of moisture to the walls from the ground due to capillary action. The patio slops towards the back of the house and he installed a drainage channel that goes along the back wall to an existing drain (laid in July 2019). Each is a subset of what PerfMon shows as "% privileged time" - which should have been labeled "kernel. So here lies my concern - will the aco drain cause a bridge for. A drain can be installed between the sill and external landscaping flush with the level floor or hidden under the finishes. Typically, the vapor barrier encapsulates the top of the parapet wall directly underneath the coping, transitioning along the vertical face of thepollution. This will transmit an unclosed contract status notification (PKX) to the PCO (which is the DFAR allowed. Oldham. the scoring idea is so you get a good visible line to then do rest of the cut. Track and field drainage systems. either welded or lapped by 100mm minimum. Using your string, mark the line along the trench that will show the finished level of the grate. ACO Drain ® systems are available in 50mm, 100mm, 200mm and 300mm internal widths, and are available with a built-in slope for up to 40 metres of. The old paving was at the same level as the DPC, that's why I think the previous owners installed the heavy duty steel trenches. #4. We understand the importance of better utilizing one of our planet's vital resource, water, and are working tirelessly to improve its utilization, collection and reuse. DPC may be bitumen, mastic asphalt, bituminous felts, plastic sheet, metal sheets, cement concrete DPC may. Mentor, OH 44060. Benefits and Drawbacks of a French Drain. Kerbed edging and then a drop to the aco drain below DPC or a second grate level with driveway and above the DPC that sits on top of Aco. 1 Compliance;. 5. The Aco Drive Drain system is a surface drain. I would look into getting a new dpc injected, that would guarantee the water is kept below. How to build a French drain for a patio: Dig a channel 500mm deep. Dpc level with concrete patio We moved into our house in October. 2m³ of concrete will be required. Enter postcode for local availability. I've now got down to the level of the drains but I don't know whether to. ACO DoorWay Drain comes complete with a two piece, corrosion resistant, Heelguard grating, suitable for pedestrian traffic. This is the second page of a three page case study following the installation of an Aco Drive Drain to a residential driveway. This will be flush with the patio slabs. This will be above the DPC, hence my plan is as follows: * Patio will slope away from house. ACO shall again notify the PCO with the reasons for the delay and a new target date. Agreed, thumbed in pointing with a lot of cement content Looks lovely . It will stop the water collecting around the house above the DPC. 45 each. Some folk fill the gap with pebbles/stones but I leave it empty. A line should be fixed along the length of the trench in order to determine the finished height and alignment of your drainage channel. nz. With its integrated approach, ACO stands for professional drainage, economical cleaning, and the controlled release and reuse of water. We know that the gully at K is 90mm below R, so Points L and M need to be 125 - 90 = 35mm higher than point R, which means it would be 150mm - 35mm = 115mm below DPC level. Iv seen a lot of cowboy builders installing aco drains on. Get Quote. 17 and 7. ACO has a number of drainage solutions specifically for tram and light-rail applications. A CIN is an arrangement (typically a separate legal organization) that is usually sponsored by an IPA or a hospital. 8. Filling sand isIf the grate lays on the (deliberately) sloped drain channel, then at one end it will be flush with the existing ground level, and at the other end it will be a centimetre or so below the ground level (assuming 1/200 fall, 2m length of drain). Slip-Resistant – ACO has tested grate patterns for slip resistance using the widely accepted pendulum test. the gap between the underside of the door and unfinished floor should be between 10mm and. Concrete Hardstanding. Types of showerdrain channels. My plan was to lay a small path around the house and install ACO drainage channels next to the property but I've run into a bit of a problem. 1. 30 Further information; 6. Proizvodi se u šest nominalnih širina. There are two steps down inside the house as you get to the back rooms and I feel fairly confident that the ground level at the back and sides. A strong brand around the world. 8. 12 Feb 2014. A solid layer of DPC is built and provide in the walls of the constructions and placed above the ground level so through the capillary action the moisture rising over the wall should be prevented. Structural dampness is the presence of unwanted moisture in the structure of a building, either the result of intrusion from outside or condensation from within the structure. This bifolding door brand also comes with a low ramp-type threshold, also having a weather rating. My problem is the top of the channel is 1 brick below the DPC and the air-bricks are directly below the DPC and so the bottom hole of the air-bricks are at the same level of the top of the. Often abbreviated to RWP on drainage drawings, is simply a drainage fitting that takes surface water from a roof downspout or collects surface water. Reaction score. Casa Grande, AZ 85122. The ACO drain can then be lowered into the trench and sealed to the drainpipe before packing it to the correct level. West Office Toll Free: 888-490-9552 825 W. #2. The door sill’s are also under the decking so my problems are:-. ACO Systems and Solutions Private Limited Third Floor, 627/4, 36B, II Phase, 60 Feet Road, Near NTTF, Chokkasandra, Peenya Bangalore - 560 058 Karnataka, India. 0125 = 0. User mode threads usually run at IRQL = passive level and cannot block ISR DPC routine. 4 side connections make it easy to install "T" and "L" shape drainage connections. 6 Drives, paths and landscaping. Reply; In reply to Cavity trays at dpc level by James. ACO DRAIN® Multiline® generacija kanala za odvodnjavanje postavlja nove standarde u oblasti projektovanja, izvođenja i efikasnosti linijskih sistema odvodnjavanja. 643. Any advice would be appreciated, cheers. We are wanting to raise our patio level with the french doors. 0. OIF-CFP2-ACO-01. However, you will need to make sure that any alterations do not make access to the dwelling any less satisfactory than it was before. In the definitions section of the Drainage Introduction page, the three classifications of drainage (Foul, Surface and Combined) are introduced. French Drains – How They Work. KlassikDrain Steel edge, modular trench system in 100mm, 200mm & 300mm internal width: PowerDrain Heavy duty iron edged, modular trench system in 100mm, 200mm &. ACO in New Zealand was established in 2012 and utilizes the 24 ACO manufacturing facilities globally, including the Australian facility located in Sydney, New South Wales. For easy disabled access. Specifications General The catch basin shall be ACO Drain K1-621 Catch Basin, comprising of a top section, trash bucket and base as manufactured by ACO, Inc. #2. AS1010 Brickslot Drainage Channel. Raise level externally but have a gap adjacent to the wall with a gravel area at normal level (150 below dpc). 3. - Kingspan styrozone H350R below the DPC fixed to the wall all the way to the foundations. Can I build an Aco drain at the DPC level or must there be a drop between DPC and the Aco drain? If so, what is the minimum drop? Thanks. the current patio is only a course to 1. Cost of Doing Business. Total installation height = 50mm. cavity in the middle, but that's now how this is) then on top of that we have a 450mm wide membrane. The treatment is to waterproof the wall area from one brick below the DPM to one brick above the final patio level with a waterproof render of at least 20mm in. Add to basket. Qty. With its holistic approach, ACO stands for professional drainage, economical cleaning and controlled drainage or reuse of water. B. The dpc height in the new extension is 12 courses high from ground level at the lowest point of the driveway . retains the integrity of the dpc, provides integral weep and reduces the visual impact of the flashing. 5 cm thick with a ratio of rich cement concrete 1:1. It is important that air bricks do not become obstructed. It is provided from the plinth level to the. One of the issues he has identified is the high ground level of a new house next door (finished around 18 months ago). The NHBC (National House Building Council) states that air bricks should ideally be placed at least 75mm above ground level. I suspect when I take up the decking I might also find an air brick below finished level. 21 Sep 2011. Slot size: 6mm x 50mm. £15. ACO manufacture sloping channels from No. Installation into Asphalt:ACO Hexdrain Channel Drain End Caps and Outlet Accessories Pack. West Office Toll Free: 888-490-9552 825 W. Retaining wall 150mm away with an acco finishing 150mm below dpc at the the bottom - then you have a "normal" build - otherwise take your chances with polythene sheets, internal tanking etc - and don't skimp on the detail. ACO stands for professional drainage, efficient cleaning, and the controlled discharge or reuse of water. comfor a bit of fun tik tok @buildingmark. Render abutting exposed features, such as stone string courses or quoins, should be finished neatly without gaps. #1. Aco drain around patio leak the water to the ground. Yes fitting an aco type drain channel around the conservatory should help with this. Country. Figure b also. Patio level causing damp. Discontinuance of Partial Quantity Disbursements While the DPC memo applies to all, the DFAS memo applies only to MOCAS paid contracts Effective for. I cant increase the digging out to get the correct level due to retaining wall. Country. So, for example, changing levels to introduce steps where none existed before would be a contravention. 2. What are gullies? By definition, a gully (in the context of a drainage system) is a drainage fitting with an open top, a definite base and an outlet to one or more sides. Cavity trays don’t have to be installed at DPC levels. The ACO would be about 75mm below DPC for most the run and drop into where the house guttering. Supply and place 1 layer of PIFA 1200 Damp Proof Membrane to base. 1) is it fine for a downpipe to go into the ACO (the ACO is connected into a gully) 2) how long can a run of ACO be? is there a point where it is too long to be effective?Welcome to ACO Drain and our extensive range of stormwater pits, the leading commercial surface drainage solution in Australia. ACO Drain consists of cast polymer concrete bodies with either galvanized steel, stainless steel or cast iron wearing edges. Depending on the type of gully, they can be used to connect wastewater outlets or stormwater/rainwater outlets to suitable drains. If one is to raise the ground level to above the original DPM, one is affectionately bridging the system to prevent rising dampness and in this case , lateral penetration of water . Drain systems and other products for home and garden. The company offers various drainage systems specifically designed to manage stormwater runoff, protecting people from hazards and properties from potential damage. Kerbed edging and then a drop to the aco drain below DPC or a second grate level with driveway and above the DPC that sits on top of Aco. (with a sizeable step (circa 175mm) into the house as it stands). Channel weights are for fiberglass body only. Provision of DPCs and cavity trays. Gradients from 1 in 40 to 1 in 110 will normally give adequate flow velocities. Is a drain used for the drainage of one building or any buildings or yards. To the rear of my 1930s property, the brickwork below and around the slate DPC is very weathered, damaged and parts have moss growing on it. The drain should be 150mm below dpc and ideally connected. If I laid patio level, it would finish above DPC or very close too. ₹ 2,000/ Meter. You might find that your penetrating damp is being caused by water leaking from gutters and downpipes on the outside of your home, so examine them for cracks. Get Quote. 350mm overlap. 00 incl VAT. 0m max 1:12 1:15 5. - It's invasive, there's the gas supply and a cable running parallel to wall. Dampworks LTD. Set of products to bring drainage design to the bathroom floor. In London in the year 1975, the DPC or damp proof course became mandatory. Minimum floor level for a site below the road level. ACO Hexdrain Channel Drain End Caps and Outlet Accessories Pack. minimum sub-base thickness. You can use permeable surfaces that allow water to drain into them or by other methods such as rain gardens (see below). Easy to assemble. For guidance on the design and installation of damp-proof courses in masonry construction, the Code of Practice - BS 8215: 1991 should be referred to. 3m high from the invert of the drain that it connects to. This would still leave the foundations higher than the. Click here for a calculator that estimates the quantities of each ingredient required to mix a C20-equivalent concrete. 10. This system of the Damp Proof Course involves fluid or liquid being injected into the wall to stop the dampness from the ground from rising above the damp proof course acting as a water-repelling layer. Tunnels and fence systems for small animals crossing roads. The plan was to paint the below ground brick and over the dpc with a bitumen emulsion and back fill. dated and must be annotated to indicate whether the liquid level was determined manually or via Tank Level Indicator (TLI). ₹ 3,500/ Meter. DR803 ACO Drain Price List 4 of 5 (Fabrications) 2022. 2,682. Ensure water falls away from the doorway in a single direction and make sure there are no cross falls. Mentor, OH 44060. 10 × (1÷80) = 10 × 0. € 58. The same applies to using <spit> decking. 2 T9070-AF-DPC-010/079-1, Design Practices and Criteria for U. 0m max Diagram 3 –. French drain - Cut away pavers 6" from house, dig trench, lay geotextile, 20mm gravel and perforated pipe, knock through drain surround below ground and feed pipe into surface water gulley. Pendulum test – A pendulum is swung over a wet surface and measures surface frictional properties. Here’s how to get the external landing and drainage right. Welcome to ACO! We specialise in designing and manufacturing high-grade concrete trench drain systems, engineered to tackle water management challenges in any environment. • You can also use the Brett High Kerb for steps, level changes, edges and borders• Colour: Charcoal• Dimensions: 150mm x. Aco Drive Drain - Case Study II. When a horizontal DPC is to be continued up a. This South African standard was approved by National Committee SABS SC 59J, Construction standards – Waterproofing membranes, films and barrier products for construction purposes, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. Some folk fill the gap with pebbles/stones but I leave it empty. The front of the house is fine with a surface which slopes downwards away from the house. ? I was thinking of using a dpc paint 3 bricks up from aco to stop penetration via splashback from rain. 804-3 also states that Components may apply additional conditions not listed in Figure 5 above, as necessary to ensure all contract requirements have been completed prior toOur RainDrain B 125 installation tutorial shows you how easy and quick it is to prepare and install ACO RainDrain B 125 drainage channels and accessories. 2. Hi, My patio is only 75mm below the damp course but has a linear drain running along the edge of the house.