{"product_id":"mapei-idrostop-hydrophilic-waterbar","title":"IDROSTOP B25 N","description":"\n\u003csection class=\"cs-product\"\u003e\n\n\u003ch2\u003eMapei Idrostop Waterbar – Hydrophilic Expanding Waterstop for Concrete Construction Joints\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eMapei Idrostop\u003c\/strong\u003e is a pre-formed, flexible hydrophilic rubber profile designed to create watertight construction joints in concrete structures. Manufactured with an acrylic polymer base, it gradually expands when in permanent contact with water, forming an active barrier that helps prevent water passing through construction joints.\u003c\/p\u003e\n\n\u003cp\u003eUnlike bentonite-based waterstops, Idrostop contains no bentonite. Its composition is designed to maintain its properties through repeated expansion and contraction cycles and in contact with aggressive water, including seawater and water found in sewage treatment plants and sewers.\u003c\/p\u003e\n\n\u003cp\u003e\u003cimg src=\"https:\/\/clevershieldcoatings.co.uk\/cdn\/shop\/files\/idrostop-waterbar-watertight-concrete-seal-959-sk.webp\" alt=\"Mapei Idrostop hydrophilic expanding rubber waterbar for waterproofing concrete construction joints\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydrophilic expansion:\u003c\/strong\u003e Gradually expands in permanent contact with water to create an active waterproofing barrier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUp to 5 atm water resistance:\u003c\/strong\u003e Mapei states impermeability up to 5 atm under its test conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBentonite-free:\u003c\/strong\u003e Acrylic polymer-based formulation without bentonite.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePositive and negative water pressure:\u003c\/strong\u003e Expanding profile creates a barrier against water pressure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible pre-formed strip:\u003c\/strong\u003e Suitable for different concrete joint configurations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResistance to aggressive water:\u003c\/strong\u003e Maintains its properties in contact with seawater and water in sewage treatment plants and sewers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMultiple installation options:\u003c\/strong\u003e Can be fixed using Idrostop Mastic or suitable mechanical fixings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cp\u003eIdrostop is designed to create watertight construction joints in civil, industrial and hydraulic structures, including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eJoints between concrete floor slabs and vertical walls.\u003c\/li\u003e\n\u003cli\u003eConstruction joints in foundations and retaining walls.\u003c\/li\u003e\n\u003cli\u003eContact joints between different materials, including PVC or steel pipes passing through concrete.\u003c\/li\u003e\n\u003cli\u003eSwimming pools and sewage treatment tanks.\u003c\/li\u003e\n\u003cli\u003eReservoirs, cisterns and hydraulic structures.\u003c\/li\u003e\n\u003cli\u003eConstruction joints in tunnels and dams.\u003c\/li\u003e\n\u003cli\u003eDrinking-water reservoirs.\u003c\/li\u003e\n\u003cli\u003eJoints where conventional waterstops are difficult to install because of dense reinforcement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAvailable Sizes and Packaging\u003c\/h3\u003e\n\u003cp\u003eMapei Idrostop is available in the following sizes:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIdrostop 10:\u003c\/strong\u003e 20 x 10mm – 6 rolls of 10 metres (60 metres total per box).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIdrostop 15:\u003c\/strong\u003e 20 x 15mm – 6 rolls of 7 metres (42 metres total per box).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIdrostop 25:\u003c\/strong\u003e 20 x 25mm – 6 rolls of 5 metres (30 metres total per box).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Mapei.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct:\u003c\/strong\u003e Idrostop.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct type:\u003c\/strong\u003e Hydrophilic expanding rubber waterstop.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eForm:\u003c\/strong\u003e Pre-formed flexible profile.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBase material:\u003c\/strong\u003e Acrylic polymer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColour:\u003c\/strong\u003e Blue.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDensity:\u003c\/strong\u003e Approximately 1.5g\/cm³.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater solubility:\u003c\/strong\u003e Insoluble.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWaterproofing performance:\u003c\/strong\u003e Up to 5 atm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElongation at break:\u003c\/strong\u003e 70–100% according to ASTM 638 M-89.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature stability:\u003c\/strong\u003e -30°C to +50°C.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStorage:\u003c\/strong\u003e 36 months in a dry place at temperatures between +10°C and +40°C.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eExpansion Performance\u003c\/h3\u003e\n\u003cp\u003eIdrostop gradually expands when in permanent contact with water. The manufacturer's stated expansion figures are:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAfter 24 hours:\u003c\/strong\u003e Approximately 45%.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAfter 2 days:\u003c\/strong\u003e Approximately 70%.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAfter 3 days:\u003c\/strong\u003e Approximately 82%.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAfter 7 days:\u003c\/strong\u003e Approximately 120%.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Guidance\u003c\/h3\u003e\n\u003cp\u003eThe concrete surface must be clean and sound before Idrostop is installed. Remove cement laitance, dust and loose material. The profile can be applied to slightly damp surfaces, but it must not be installed while the structure is immersed in water. Remove free-standing water and allow several hours before installation.\u003c\/p\u003e\n\n\u003cp\u003eIdrostop can be fixed using Idrostop Mastic, a ready-to-use MS polymer adhesive, or suitable mechanical fixings such as nails or screws.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUsing Idrostop Mastic:\u003c\/strong\u003e Apply the adhesive evenly and press the profile firmly onto the prepared substrate. Allow 24 hours before pouring the next concrete section.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced waiting time:\u003c\/strong\u003e Where necessary, the waiting time can be reduced to a minimum of 4 hours after applying Idrostop Mastic, with additional nails or screws placed every metre to prevent movement during the concrete pour.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUsing nails or screws:\u003c\/strong\u003e Fixings should be spaced no more than 25cm apart. Concrete can be poured immediately after mechanical fixing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication temperature using Idrostop Mastic:\u003c\/strong\u003e +10°C to +40°C.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVertical installation:\u003c\/strong\u003e Mapei recommends installing the profile in lengths of approximately 1 metre on vertical surfaces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConcrete cover:\u003c\/strong\u003e The thickness of concrete protecting the installed Idrostop should be at least 8cm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJoint connections:\u003c\/strong\u003e The ends can be aligned end-to-end. Mapei also illustrates a 2–3cm staggered overlap for improved sealing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Do not install Idrostop on surfaces heavily contaminated with acids or solvents. Ensure the profile is correctly positioned and adequately confined within the concrete. Follow the manufacturer's current technical datasheet for the complete installation procedure.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003ch4\u003e1. What is Mapei Idrostop used for?\u003c\/h4\u003e\n\u003cp\u003eMapei Idrostop is used to waterproof construction joints in concrete structures. Typical applications include foundations, retaining walls, swimming pools, reservoirs, tunnels, dams and other civil, industrial and hydraulic structures.\u003c\/p\u003e\n\n\u003ch4\u003e2. How does Idrostop Waterbar work?\u003c\/h4\u003e\n\u003cp\u003eIdrostop gradually expands when in permanent contact with water. This expansion creates an active barrier within the concrete construction joint, helping to prevent water passing through the joint under hydraulic pressure.\u003c\/p\u003e\n\n\u003ch4\u003e3. What water pressure can Idrostop withstand?\u003c\/h4\u003e\n\u003cp\u003eMapei states impermeability up to 5 atm under its test conditions. Actual performance depends on correct installation, concrete quality and the construction details surrounding the waterstop.\u003c\/p\u003e\n\n\u003ch4\u003e4. What sizes does Idrostop come in?\u003c\/h4\u003e\n\u003cp\u003eThe sizes listed here are Idrostop 10 (20 x 10mm), Idrostop 15 (20 x 15mm) and Idrostop 25 (20 x 25mm). Each is supplied in boxes containing six rolls.\u003c\/p\u003e\n\n\u003ch4\u003e5. Does Idrostop contain bentonite?\u003c\/h4\u003e\n\u003cp\u003eNo. Idrostop has an acrylic polymer base and does not contain bentonite. Its composition is designed to maintain its properties through repeated expansion and contraction cycles.\u003c\/p\u003e\n\n\u003ch4\u003e6. How do you fix Idrostop to concrete?\u003c\/h4\u003e\n\u003cp\u003eIdrostop can be fixed using Idrostop Mastic or suitable mechanical fixings. When using Idrostop Mastic, the normal waiting time before pouring concrete is 24 hours. Mechanical fixing with nails or screws allows concrete to be poured immediately.\u003c\/p\u003e\n\n\u003ch4\u003e7. Can Idrostop be installed on a wet surface?\u003c\/h4\u003e\n\u003cp\u003eIt can be applied to slightly damp concrete, but it must not be installed while the structure is immersed in water. Remove free-standing water and allow several hours before fixing the profile.\u003c\/p\u003e\n\n\u003ch4\u003e8. How much concrete cover is required?\u003c\/h4\u003e\n\u003cp\u003eMapei specifies a minimum concrete cover thickness of 8cm around the installed Idrostop profile.\u003c\/p\u003e\n\n\u003ch3\u003eBuy Mapei Idrostop Waterbar from Clever Shield\u003c\/h3\u003e\n\u003cp\u003eClever Shield supplies professional Mapei waterproofing products throughout the UK, including specialist waterstops for concrete construction joints, basement waterproofing and hydraulic structures.\u003c\/p\u003e\n\n\u003cp\u003eOrder Idrostop 10, Idrostop 15 or Idrostop 25 for your next concrete waterproofing project. Contact our team for availability, pricing and delivery enquiries.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Downloads\u003c\/h3\u003e\n\u003cdiv class=\"cs-buttons\"\u003e\n\u003ca class=\"cs-btn\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0321\/5320\/6920\/files\/IDROSTOP_DATA_SHEET.pdf?v=1730467954\" target=\"_blank\" rel=\"noopener\"\u003eDownload Technical Data Sheet\u003c\/a\u003e\n\u003ca class=\"cs-btn\" href=\"https:\/\/cdnmedia.mapei.com\/docs\/librariesprovider57\/products-documents\/1_00411_idrostop_en-tr_e5a2d2b9d0b9429180cfa758c96b344b.pdf?sfvrsn=cc9b83c3_0\" target=\"_blank\" rel=\"noopener\"\u003eView Official Mapei Data Sheet\u003c\/a\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eIdrostop is classified by Mapei as an article and does not require a Safety Data Sheet under the applicable REACH requirements.\u003c\/p\u003e\n\n\u003cp\u003eClever Shield supplies Mapei waterproofing products throughout the UK. We supply products and manufacturer documentation but do not provide project-specific waterproofing design or specification.\u003c\/p\u003e\n\n\u003c\/section\u003e\n","brand":"Mapei","offers":[{"title":"25x20mm - 6 x 5m Rolls (30m Per Box)","offer_id":57008564928887,"sku":"IDROSTOPB25N","price":675.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0321\/5320\/6920\/files\/idrostop-waterbar-watertight-concrete-seal-164.webp?v=1765891663","url":"https:\/\/clevershieldcoatings.co.uk\/products\/mapei-idrostop-hydrophilic-waterbar","provider":"Clever Shield - Asset Protection","version":"1.0","type":"link"}