{"product_id":"mapei-idrostop-b25","title":"Mapei Idrostop B25","description":"\u003csection class=\"description-generic margin-bottom-md\"\u003e\n\u003csection class=\"description-generic margin-bottom-md\"\u003e\n\u003cdiv class=\"col-sm-10 col-sm-push-1 col-xs-12\"\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"col-sm-6 col-xs-12 no-padding-xs\"\u003e\n\u003cdiv class=\"ProductDescription margin-xs-top-md\" style=\"text-align: start;\"\u003e\n\u003csection class=\"description-generic margin-bottom-md\"\u003e\n\u003csection class=\"description-generic margin-bottom-md\"\u003e\n\u003ch2\u003e\u003cspan\u003eIdrostop B25 – Hydro-Expanding Bentonite Waterstop\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eIdrostop B25\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is a pre-formed hydro-expanding bentonite waterstop designed to create watertight construction joints in civil, industrial and hydraulic concrete structures. It is manufactured from natural sodium bentonite and polymers, providing a flexible and stable joint-sealing material.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWhen Idrostop B25 comes into contact with water, it expands gradually and uniformly. This expansion allows the strip to adapt to the surrounding concrete and seal localised voids, helping prevent water from passing through construction joints. It can be used against both positive and negative water pressure.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0321\/5320\/6920\/files\/idrostop-b25.jpg?v=1791280647\" alt=\"Mapei Idrostop B25 hydro-expanding bentonite waterstop strip for waterproofing concrete construction joints.\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eKey Benefits\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eHydro-expanding bentonite waterstop\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDesigned for watertight concrete construction joints\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eMade from natural sodium bentonite and polymers\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eControlled, gradual and uniform expansion\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCreates an active barrier against water\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSuitable for positive and negative water pressure\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eFlexible pre-formed strip\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHelps seal localised voids in concrete\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSuitable for civil, industrial and hydraulic construction\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSuitable for joints between different materials\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eNo waiting period required before concrete casting\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSuitable for application from -5°C to +50°C\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eApplications\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eIdrostop B25 is suitable for waterproofing construction and contact joints, including:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eConcrete foundation-to-wall construction joints\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eJoints between concrete pours\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eJoints between different construction materials\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSteel pipes passing through concrete\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePVC pipes passing through concrete\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSwimming pools\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eWater-treatment structures\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eStorage tanks and reservoirs\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHydraulic structures\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCivil and industrial concrete construction\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSealing elements passing through bentonite waterproofing membranes\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eTechnical Information\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eProduct type:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Hydro-expanding bentonite waterstop\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eForm:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Pre-formed strip\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eComposition:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Natural sodium bentonite and polymers\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eDimensions:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 20 × 25mm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eColour:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Dark green\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eApplication temperature:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e -5°C to +50°C\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eWater solubility:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Insoluble\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eMain property:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Expands on contact with water\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003ePackaging:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 6 × 5m rolls per box\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eTotal per box:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 30 linear metres\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eWaiting time before concrete casting:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Not required\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eStorage:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 24 months\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eHow Idrostop B25 Works\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eIdrostop B25 is positioned within the construction joint before the second concrete pour. When water reaches the bentonite strip, it gradually expands and fills available spaces within the joint.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe controlled expansion allows the material to conform to the surrounding concrete and helps close localised voids, creating a barrier against water penetration.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eInstallation \u0026amp; Important Requirements\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe installation surface should be suitable for application and free from standing water. Idrostop B25 should not be installed while the structure is immersed in water.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe substrate should also be free from significant acid or solvent contamination.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eImportant installation requirements include:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eIdrostop B25 must not be used as a structural expansion joint.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eThe boundary distance must be at least \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e80mm\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eReinforcement spacers must be positioned at least \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e50mm\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e from the surface on which Idrostop B25 is installed.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eFollow the manufacturer's installation requirements for positioning and fixing.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThe suitability of the product should be assessed for the specific project and substrate.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eFrequently Asked Questions\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e1. What is Idrostop B25 used for?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eIdrostop B25 is used to waterproof construction joints in concrete structures using a hydro-expanding bentonite waterstop.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e2. How does Idrostop B25 waterproof a joint?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eThe natural bentonite within the strip expands when it comes into contact with water. This expansion fills available spaces around the joint and helps prevent water from passing through.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e3. What size is Idrostop B25?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eIdrostop B25 has a cross-section of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e20 × 25mm\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and is supplied as 5m rolls.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e4. How much Idrostop B25 is supplied in a box?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eEach box contains \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e6 × 5m rolls\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, providing a total of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e30 linear metres\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e5. Does Idrostop B25 need to expand before concrete is poured?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eNo. There is no required waiting period before casting the concrete after installation.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eImportant Limitations\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eIdrostop B25 should not be installed where there is standing water or while the structure is immersed in water.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIt should \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003enot be used as a structural expansion joint\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. The required minimum boundary distance and reinforcement clearance must also be maintained during installation.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 class=\"text-base description-adv text-brand text-weight-700 margin-bottom-md\"\u003e\u003cspan style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 0.875rem;\"\u003eDownloads\u003c\/span\u003e\u003c\/h2\u003e\n\u003c\/section\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/section\u003e\n\u003csection class=\"description-tecnici margin-bottom-md\"\u003e\n\u003cdiv class=\"text-smedium\"\u003e\n\u003cdiv class=\"container-fluid bg-grey-white is-shadowed\"\u003e\n\u003cdiv class=\"container container-padded padding-top-big\"\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"col-sm-10 col-sm-offset-1 col-xs-12\"\u003e\n\u003cp class=\"h4 text-center 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d-flex justify-content-start justify-content-sm-end\"\u003e\n\u003cdiv class=\"box-attached-documentation-tools padding-horizontal-md no-padding-sm-horizontal no-padding-xs-horizontal flex-1 flex-wrap flex-sm-nowrap d-flex justify-content-end\"\u003e\n\u003cdiv class=\"sds-helper-selector helper-wrapper d-flex w-auto\"\u003e\n\u003cdiv class=\"text-left text-uppercase\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e","brand":"Mapei","offers":[{"title":"20 × 25mm x 6 Rolls","offer_id":57514055631223,"sku":"IDROSTOPB25","price":576.0,"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-b25","provider":"Clever Shield - Asset Protection","version":"1.0","type":"link"}