{"title":"Cavity Drain","description":"\u003cp\u003eA cavity drain system is a Type C approach to waterproofing below-ground structures, as classified in BS 8102. Rather than attempting to resist water at the structure itself, a Type C system accepts that water may enter and controls it by diverting it safely to a drainage point. A studded membrane is fixed to the internal faces of walls and laid across floors, creating a drainage void between the membrane and the substrate. Water that passes through the structure is captured within this void and channeled to a perimeter drainage system, from where it is diverted to a sump and pump or a gravity drain for disposal.\u003c\/p\u003e\n\u003cp\u003eThis approach is suitable for basements, sub-structures and retaining walls, and can be used in both new build and retrofit projects. It is particularly well suited to retrofit waterproofing of existing structures where achieving a reliable Type A tanking barrier would be difficult or impractical, as it does not rely on the structural envelope being fully watertight. When correctly specified and installed, a cavity drain system is capable of providing Grade 1, 2 and 3 levels of protection as classified in BS 8102. BS 8102 also requires that Type C cavity drain systems are maintainable, meaning the drainage channels must remain accessible for inspection and maintenance throughout the life of the structure.\u003c\/p\u003e\n\u003ch2\u003eCavity Drain Membranes\u003c\/h2\u003e\n\u003cp\u003eCavity drain membranes are high density polyethylene studded sheets fixed to the internal face of below-ground walls and laid across floors. The studded profile holds the membrane away from the substrate, creating the drainage void that allows water entering the structure to travel freely downward to the perimeter drainage channel at the base of the wall. The size of the stud determines the depth of the drainage void behind the membrane.\u003c\/p\u003e\n\u003cp\u003eThey are designed for basements, sub-structures, vaults and tunnels, and can be applied to walls and floors with minimal surface preparation. They can be installed on wet substrates without requiring a drying-out period, and internal finishes and dry lining can be installed directly after the membrane is in place. The membranes provide a complete barrier to water and water vapour, and are resistant to ground salts, roots and contaminants encountered in below-ground environments and are BBA certified and suitable for use as a Type C waterproofing system in accordance with BS 8102.\u003c\/p\u003e\n\u003ch2\u003ePerimeter Drainage Channels\u003c\/h2\u003e\n\u003cp\u003eThe perimeter drainage channel is installed at the critical wall-to-floor junction, where water draining down within the void behind the wall membrane collects and enters the channel through pre-drilled drainage holes. From there it is diverted along the channel to an outlet point connected to a sump collection chamber or a gravity drain for disposal. The drainage channel range from RIW includes outlet fittings that connect the channel to the sump or discharge point, and rodding eyes that provide access points for inspection and flushing of the channel at regular intervals along its run. Maintaining access for inspection is a requirement of BS 8102 for Type C systems and must be built into the layout of the drainage channel from the outset.\u003c\/p\u003e\n\u003cp\u003eA drainage board is also available for applications where both water management and membrane protection are needed. It promotes drainage of water away from the structure while providing a protective covering over an applied membrane.\u003c\/p\u003e\n\u003ch3\u003eCavity Drain Ancillaries\u003c\/h3\u003e\n\u003cp\u003eA complete cavity drain installation requires a set of ancillary products to secure the membrane, seal laps and junctions, and maintain the integrity of the system at all vulnerable points. Fixing plugs are used to mechanically secure the membrane to the wall substrate, driving through the membrane and into the substrate below.\u003c\/p\u003e\n\u003cp\u003eEach fixing point requires sealing rope placed around it as a gasket to prevent water tracking through the fixing location. Sealing rope is also applied at laps between overlapping sheets of membrane, and around any service entry pipes or penetrations that pass through the membrane, ensuring the drainage void remains continuous and sealed at all these points.\u003c\/p\u003e\n\u003cp\u003eOver tape is a self-adhesive butyl rubber tape applied at wall-to-floor, wall-to-wall and wall-to-soffit junctions, around pipe penetrations, and to seal membrane laps and joints where required. Where the cavity drain system is being used as a radon barrier, all lap joints in the membrane must be sealed with over tape to ensure the system performs as a gas barrier as well as a water management system.\u003c\/p\u003e\n\u003ch3\u003eInstalling a Cavity Drain System\u003c\/h3\u003e\n\u003cp\u003eInstallation follows a logical sequence from drainage to membrane to finish. The perimeter drainage channel is installed first at the wall-to-floor junction, connected to the sump or discharge point before work on the membrane begins. Rodding eyes are positioned at appropriate intervals along the channel run to ensure the system remains accessible for maintenance.\u003c\/p\u003e\n\u003cp\u003eOnce the drainage channel is in place, the membrane can be applied to wet substrates without a drying-out period. Surfaces must be clean and free from loose material, grease and frost before sealing rope and over tape are applied. The membrane is mechanically fixed to the wall substrate using fixing plugs, with sealing rope used at each fixing point and at all sheet laps to seal the drainage void. Over tape is applied at all junctions, penetrations and membrane laps where required. All sealing must be completed before dry lining and internal finishes are installed, as these points will be inaccessible once fit-out begins. On floors, the membrane is laid across the substrate with laps sealed using sealing rope, with laps and junctions sealed to ensure water flows freely to the drainage channel.\u003c\/p\u003e\n\u003ch2\u003eChoosing a Cavity Drain System\u003c\/h2\u003e\n\u003cp\u003eA cavity drain system is typically specified when the structure cannot reliably be made watertight by a Type A or Type B approach, or where the design requires a maintainable internal waterproofing system. It is the standard solution for retrofit waterproofing of existing basements and sub-structures where the external face of the structure is inaccessible, and is regularly used in new build applications where ground conditions or programme constraints make Type A tanking impractical.\u003c\/p\u003e\n\u003cp\u003eUnder BS 8102, the required Grade of internal environment determines the level of protection the system must deliver. Grade 1 covers utility and storage areas, Grade 2 covers working environments and Grade 3 covers fully habitable space. A correctly specified and maintained cavity drain system can meet all three grades. The membrane specification, drainage channel layout and sump capacity should all be confirmed at design stage against the applicable Grade requirement. Where the structure is subject to ground gas or radon in addition to water ingress, all membrane laps must be sealed with over tape to ensure the system provides an effective gas barrier as well as a water management solution.\u003c\/p\u003e\n\u003ch2\u003eWhy Choose Construction Supplies UK for Cavity Drain Systems?\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCavity drain membranes, drainage channels and ancillaries in one place:\u003c\/strong\u003e From BBA-certified HDPE studded membranes to perimeter drainage channels, outlets, rodding eyes, fixing plugs, sealing rope and over tape, we stock the full component set for a Type C cavity drain system.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTrusted industry brands: \u003c\/strong\u003eShop cavity drain products from RIW and Wykamol, two established brands in below-ground waterproofing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCompetitive trade prices: \u003c\/strong\u003eCavity drain products supplied at competitive trade prices with no minimum order value.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFast UK-wide delivery:\u003c\/strong\u003e Reliable nationwide delivery with free shipping available on orders over £300.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExpert support when you need it:\u003c\/strong\u003e Our team can help you select the right membrane and system components for your project. Get in touch @ sales@constructionsuppliesuk.co.uk or call us on 03300 55 32 02.\u003c\/p\u003e","products":[{"product_id":"wykamol-cm8-cavity-drain","title":"Wykamol CM8 Cavity Drain","description":"\u003cp\u003eWykamol CM8 is a Type C cavity drain membrane system for below-ground structures. The 8mm studded HDPE profile holds the membrane away from the substrate, creating a drainage cavity that channels groundwater to perimeter drainage and a sump pump, controlling water ingress rather than resisting it. The clear membrane makes it straightforward to locate and fix CM Brick Plugs during installation.\u003c\/p\u003e\n\u003cp\u003eThe membrane requires minimal surface preparation and can be applied to walls, floors and ceilings. Because no drying-out period is needed, internal finishes and dry lining can be installed immediately after the membrane is in place. Perimeter drainage channels should be installed at the base of walls to optimise water flow towards the sump location.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMinimal surface preparation required\u003c\/li\u003e\n\u003cli\u003eNo drying-out period before applying internal finishes\u003c\/li\u003e\n\u003cli\u003eLow and high temperature tolerance\u003c\/li\u003e\n\u003cli\u003eDurability, will last the lifetime of the structure\u003c\/li\u003e\n\u003cli\u003eWaterproof, salt inhibiting, root and contaminant resistant\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know \u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eType C cavity drain system — BS 8102:2022 compliant\u003c\/li\u003e\n\u003cli\u003eBBA certified\u003c\/li\u003e\n\u003cli\u003eStore upright, under cover, away from heat and open flames\u003c\/li\u003e\n\u003cli\u003eTypical applications, internal waterproofing of basement walls and floors — Type C BS 8102:2022, dry lining using timber battens or steel dry lining systems, vaults and tunnels and External foundation waterproofing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Wykamol","offers":[{"title":"Default Title","offer_id":57127680147788,"sku":"BM05996","price":112.3,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/wykamol-wykamol-cm8-cavity-drain-1232467445.jpg?v=1776263495"},{"product_id":"riw-cavity-drain-sealing-rope","title":"RIW Cavity Drain Sealing Rope","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eRIW Sealing Rope is a flexible butyl and rubber blend sealing rope designed specifically as an accessory within the RIW cavity drainage waterproofing system. Its good adhesion to most common surfaces combined with good movement capability makes it well suited to the dynamic conditions encountered in below-ground waterproofing installations.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe rope performs three key roles within the Cavity Drain system. It provides a reliable seal at overlapping sheet junctions between Cavity Drain R20 and R7 membranes, ensuring continuity of the waterproof barrier at laps. It seals around service entry pipes where they penetrate the membrane, preventing water tracking through these vulnerable details. It also acts as a gasket around the mechanical fixings used to secure Cavity Drain R20, R7 and Plaster Drain, maintaining a watertight seal at each fixing point.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eButyl \u0026amp; rubber blend\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eGood adhesion to most surfaces\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eSeals around service entry pipes\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eIt acts as a gasket around the mechanical fixings used to secure Cavity Drain R20, R7 and Plaster Drain, maintaining a watertight seal at each fixing point.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e \u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eGood to know \u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eAll surfaces should be clean \u0026amp; dry and free from loose material\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eGood movement capability makes it well suited to the dynamic conditions encountered in below-ground waterproofing installations.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"RIW","offers":[{"title":"Default Title","offer_id":57127690404172,"sku":"BM05727","price":31.68,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/riw-riw-cavity-drain-sealing-rope-1232467485.png?v=1776259891"},{"product_id":"riw-cavity-drain-over-tape","title":"RIW Cavity Drain Over Tape","description":"\u003cp\u003eRIW Cavity Drain Over Tape is applied over the top of joints and fixing positions in cavity drain membranes to provide an additional seal. It supplements the Cavity Sealing Tape as a secondary barrier to prevent fine materials entering the drainage cavity, particularly where there is a risk of screed or plaster penetrating joints under pressure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSecondary self-adhesive sealing layer for previously sealed joints and fixing plug penetrations\u003c\/li\u003e\n\u003cli\u003ePrevents screed and plaster from entering the drainage cavity at joints and fixing points\u003c\/li\u003e\n\u003cli\u003eProvides additional protection at vulnerable fixing plug penetrations where the membrane has been perforated\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know\u003c\/strong\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eApply over all previously sealed joints (on top of Cavity Sealing Tape) and over all fixing plug penetrations\u003c\/li\u003e\n\u003cli\u003eUsed as a complement to RIW Cavity Sealing Tape, not a standalone replacement.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"RIW","offers":[{"title":"Default Title","offer_id":57127695909196,"sku":"BM05740","price":99.65,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/riw-riw-cavity-drain-over-tape-1232467525.jpg?v=1776258855"},{"product_id":"riw-cavity-rapid-fixing-plugs","title":"RIW Cavity Rapid Fixing Plugs","description":"\u003cp\u003eRIW Cavity Rapid Fixing Plugs are a faster alternative to standard cavity drain plugs, designed to be driven directly into the substrate without pre-drilling in suitable masonry and block work, significantly speeding up the installation of cavity drain membranes on site.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFaster installation, designed for direct driving without pre-drilling in suitable substrates, reducing labour time on site\u003c\/li\u003e\n\u003cli\u003eProvides secure mechanical fixing for RIW Cavity Drain R20 membrane\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCompatible with RIW Cavity Drain R20 and other cavity drain membranes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCheck substrate to ensure pre-drilling isn't required\u003c\/li\u003e\n\u003cli\u003eConcrete and harder masonry may need to be pre-drilled\u003c\/li\u003e\n\u003cli\u003eSpace fixings at approx 300mm centres\u003c\/li\u003e\n\u003cli\u003eSeal over penetrations with RIW Cavity Drain Over Tape\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"RIW","offers":[{"title":"Default Title","offer_id":57127696236876,"sku":"BM05742","price":34.6,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/riw-riw-cavity-rapid-fixing-plugs-1232467492.jpg?v=1776258811"},{"product_id":"riw-cavity-drain-plugs","title":"RIW Cavity Drain Plugs","description":"\u003cp\u003eRIW Cavity Drain Plugs are mechanical fixings used to secure RIW Cavity Drain membranes to walls in Type C basement water management systems. They are driven through the membrane into pre-drilled holes in the wall substrate and create a positive mechanical fix that holds the membrane in place during plastering or board fixing operations.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMechanical fixing specifically designed for RIW Cavity Drain R20 membrane, secures the membrane firmly to the wall substrate\u003c\/li\u003e\n\u003cli\u003ePrevents membrane displacement during finishing operations (plastering, dry lining, screed laying)\u003c\/li\u003e\n\u003cli\u003eFor use with Cavity Drain R20\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know \u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDrill substrate to the appropriate diameter. Press the plug through the membrane stud and into the pre-drilled hole.\u003c\/li\u003e\n\u003cli\u003eSpace fixings at typically 300 mm centres\u003c\/li\u003e\n\u003cli\u003eSeal over plug penetrations using RIW Cavity Drain Over Tape\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"RIW","offers":[{"title":"Default Title","offer_id":57127696400716,"sku":"BM05743","price":24.92,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/riw-riw-cavity-drain-plugs-1232467530.png?v=1776258754"},{"product_id":"riw-aqua-channel-rodding-eye","title":"RIW Aqua Channel Rodding Eye","description":"\u003cp\u003eThe RIW Aqua Channel Rodding Eye is installed at strategic points in the perimeter drainage run to allow access for inspection, rodding to clear blockages, and maintenance of the drainage system. Current drainage design guidance and structural waterproofing standards.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eProvides maintenance and inspection access to the perimeter drainage system, essential for clearing blockages and verifying system performance\u003c\/li\u003e\n\u003cli\u003eRequired for BS 8102:2009 Type C system compliance, fully maintainable systems are a code requirement\u003c\/li\u003e\n\u003cli\u003ePart of the complete RIW Aqua Channel drainage system\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIt is recommended that one of these units is installed at approximately every 12 linear metres along the straight lengths of Aqua Channel\u003c\/li\u003e\n\u003cli\u003e40mm hole is cut into the top of the Aqua Channel to enable a straight connector with a removable cap and rubber seal to be solvent welded to a male coupling\u003c\/li\u003e\n\u003cli\u003eAdditional pipework may be added, if required, to suit location of inspection point.\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"RIW","offers":[{"title":"Default Title","offer_id":57127696728396,"sku":"BM05744","price":23.53,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/riw-riw-aqua-channel-rodding-eye-1232467534.png?v=1776258914"},{"product_id":"riw-aqua-channel-outlet","title":"RIW Aqua Channel Outlet","description":"\u003cp\u003eThe RIW Aqua Channel Outlet connects the perimeter drainage channel to the sump chamber, allowing water collected in the channel to discharge into the sump for pumping away. It is an essential component of every Type C system.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePurpose-designed outlet connecting the perimeter Aqua Channel drainage system to the sump chamber or pump\u003c\/li\u003e\n\u003cli\u003eProvides a controlled clean connection to the sump, essential for ensuring collected water discharges efficiently.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePVC construction for long-term durability in below ground conditions\u003c\/li\u003e\n\u003cli\u003ePart of the complete Aqua Channel system\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know \u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePosition the outlet at the lowest point of the perimeter drainage channel run, immediately adjacent to the sump chamber.\u003c\/li\u003e\n\u003cli\u003eEnsure a positive fall toward the outlet from all points of the channel run\u003c\/li\u003e\n\u003cli\u003eConnect securely to the sump inlet pipe.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"RIW","offers":[{"title":"Default Title","offer_id":57127696826700,"sku":"BM05745","price":12.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/riw-riw-aqua-channel-outlet-1232467535.png?v=1776258931"},{"product_id":"riw-aqua-channel","title":"RIW Aqua Channel","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eRIW Aqua Channel is a purpose-designed internal peripheral PVC drainage conduit for use in below-ground waterproofing systems. Its distinctive pentagonal profile allows it to sit neatly at the wall and floor junction — the most vulnerable point for water ingress in a basement — where it collects any water entering through the structure and diverts it to a suitable drainage outlet.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eWater enters the channel through the pre-drilled 19mm holes, spaced at 70mm centres along its length, and is then directed either to a natural gravity-fed outlet or to a mechanical sump and pump system depending on the site conditions. This makes it highly adaptable across a wide range of below-ground drainage scenarios.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eSupplied in 2m lengths for straightforward site handling \u0026amp; installation\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003ePentagonal PVC profile fits neatly at wall\/floor junction\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eCompatible with Cavity Drain R20\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eType C compliant \u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eSpecifically designed for the control of water ingress in below ground situations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAqua channel is fitted around the periphery of an internal floor at the vulnerable wall \u0026amp; floor junction to collect and discharge water ingress\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e \u003c\/p\u003e","brand":"RIW","offers":[{"title":"Default Title","offer_id":57127697285452,"sku":"BM05748","price":35.89,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/riw-riw-aqua-channel-1232467538.png?v=1776258633"},{"product_id":"riw-double-drain","title":"RIW Double Drain","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eRIW Double Drain is a cold-applied HDPE profiled drainage sheet bonded with a permeable geotextile filter fabric, engineered to manage groundwater at the external face of a structure. Rather than acting as a barrier membrane, it works by channelling groundwater away from the structure to land drainage, effectively relieving hydrostatic pressure and preventing water buildup against the waterproofed surface.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe geotextile filter fabric prevents fine soil particles from entering and blocking the drainage layer, ensuring long-term drainage performance even in challenging ground conditions. The product's good impact resistance also makes it an effective protection layer for primary waterproofing systems during backfilling and construction activity, guarding against mechanical damage that could otherwise compromise the membrane.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eDouble drain can be used on its own to isolate the structure from surrounding earth or in conjunction with a primary waterproofing system\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eRelieves hydrostatic water pressure\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eHigh drainage capacity\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eGood impact resistance, providing protection to the primary membrane\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eQuick \u0026amp; easy to install\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003ePrevents ground water reaching structure\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eEliminates necessity for granular backfill\u003c\/li\u003e\n\u003cli\u003eCan be applied to concrete masonry and a primary membrane.\u003c\/li\u003e\n\u003cli\u003eJ40 - Flexible Sheet tanking\/Damp Proofing in accordance with NBS Clauses\u003c\/li\u003e\n\u003cli\u003eSurfaces should be clean and dry before application\u003c\/li\u003e\n\u003cli\u003e Double Drain should be applied to the outer face of the structure, with the geotextile filter fabric facing outwards\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"RIW","offers":[{"title":"Default Title","offer_id":57127697809740,"sku":"BM05749","price":683.53,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/riw-riw-double-drain-1232467540.jpg?v=1776258530"},{"product_id":"riw-cavity-drain-r20","title":"RIW Cavity Drain R20","description":"\u003cp\u003eRIW Cavity Drain R20 is a 1mm thick HDPE profiled sheet cavity drainage membrane with 20mm high studs, designed for use as an internal Type C waterproofing system in basements, sub-structures and retaining walls. Rather than resisting water at source, it collects incoming water within the cavity created by its studded profile and channels it to a sump or drainage point for controlled disposal — protecting the usable space behind without relying solely on the structural envelope.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBenefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e20mm stud height provides a generous drainage void.\u003c\/li\u003e\n\u003cli\u003eHigh compressive strength makes R20 well suited to floor and wall applications where robust performance under load is required.\u003c\/li\u003e\n\u003cli\u003eIt can be applied to wet substrates and is compatible with concrete masonry sheet \u0026amp; concrete piled walls.\u003c\/li\u003e\n\u003cli\u003ePractical for a wide range of below ground applications\u003c\/li\u003e\n\u003cli\u003eComplete water and vapour barrier\u003c\/li\u003e\n\u003cli\u003eWhen using on walls \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWhen installed correctly cavity drain R20 is capable of meeting the protection requirements for grade 1,2 \u0026amp; 3 basements as classified in BS8102:2009, \u003c\/li\u003e\n\u003cli\u003eBBA certified\u003c\/li\u003e\n\u003cli\u003e1mm thick HDPE with 20mm studs\u003c\/li\u003e\n\u003cli\u003eHigh compressive strength\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eChemically resistant \u003c\/li\u003e\n\u003cli\u003eFixings required for one roll of R20 applied to walls is 5 brick plugs per m² and 6 rolls of sealing rope\u003c\/li\u003e\n\u003cli\u003eFixings required for one roll of R20 applied to floors is 5 rolls of sealing rope\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"RIW","offers":[{"title":"Default Title","offer_id":57127697908044,"sku":"BM05750","price":391.77,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/files\/riw-riw-cavity-drain-r20-1232467541.jpg?v=1776258495"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1046\/6715\/2716\/collections\/0002099_riw-r20-cavity-drain-2-x-20m_510.jpg?v=1775131206","url":"https:\/\/www.constructionsuppliesuk.co.uk\/collections\/cavity-drains.oembed","provider":"Construction Supplies UK","version":"1.0","type":"link"}