1. DPC & Cavity Trays. RIW Cementseal. Your product has been successfully added to your basket. Over expansion joints allow slack in theby RIW Cementflex is a two component, polymer rich and flexible Cement based waterproof coating for concrete and masonry, with excellent adhesion to prepared substrates. Cementflex is a two component, polymer rich and flexible cement based waterproof coating for concrete and masonry, with excellent adhesion to prepared substrates. co. uk website: British Board of Agrément tel: 01923 665300 Bucknalls Lane fax: 01923 665301 Watford e-mail: mail@bba. pdf. The Fastglobe team have been at it again at Tower Hamlets, London. View. Temporary waterproofing: Cementseal may be applied 1mm thick over the area as required, to limit water ingress during construction. by RIW Cementseal is a two component, polymer modified Cement based waterproof coating for concrete and masonry, with excellent adhesion to prepared substrates. RIW Cementseal Primer Data Sheet. MIXING RIW Cementfill HB should be mechanically mixed in the tub supplied using a slow speed drill and paddle or a forced. DPM Blue; DPM Red; Sheetseal 226DPC & Cavity Trays. RIW LTD 580 / 581 Ipswich Road, Slough, Berkshire, SL1 4EQ, UK T: +44 (0) 1753 944200 E: technical@riw. Search products by application Find your local stockist Take one of our online CPD’s. Highly porous substrates should be primed with RIW Cementseal Primer. All applications. BENEFITS l Totally waterproof l Resists up to 100m head of positive and negative water pressure l Seamless and fully bonded l Applied to damp surfaces l Abrasion and impact resistant l Quick and easy to apply by hand or. Applying Damp Proof Membranes. 8. Betec Mesh 100. level above ground. uk Herts WD25 9BA ©2014 website: strength of the concrete sub-base should be a minimum of 20 N/ mm². Cementflex was used at horizontal and vertical junctions to reinforce the Cementseal against differential movement. RIW Aqua Channel A PVC drainage conduit designed to control water ingress in below ground structures. RIW Cementseal Primer – a ‘primer’ for use on all horizontal and porous surfaces. RIW-TD-402 - View presentation slides online. U. RIW Cementseal is a two component polymer modified cement based waterproof concrete sealer coating with excellent adhesion to prepared concrete and masonry substrates. RIW Cementseal is a cement-based, polymer-modified, two-component, coating that acts as a waterproofing agent. Cementflex was used at horizontal and vertical junctions to reinforce the Cementseal against differential movement. compound, RIW Cementfill WP. Precon Products, A leading national independent supplier of construction productsDownload data sheets Search products by application Download typical details Find your local stockist Take one of our online CPD’s. Precon Products, A leading national independent supplier of construction products Download data sheets Search products by application Download typical details Find your local stockist Take one of our online CPD’s. All gas membranes to be inspected and verified in accordance with Table 7 of BS8485:2015. pdf. RIW produce a range of ancillary products for use with Sheetseal 226 which include: Cementfill FC - Cement based waterproof fairing coat and repair mortar for filling minor holes, voids and defects. The product cures to form a durable, highly. Gas Seal Black Data Sheet. RIW Aqua Channel acts as a maintainable drainage channel, and must be installed including :RIW Cementseal Primer Cementseal Primer is a multi-functional, water based primer/curing agent, formulated on an aqueous acrylic copolymer. Call Technical on 01753 944200 for more information. A single component cementitious high build mortar, which incorporates the most advanced cement chemistry, microsilica, fibre and styrene acrylic copolymer technology. Below the concrete slab we recommended RIW Sheetseal 226. Move the exposed person to fresh air. This detail is suitable for damproofing only and should not be subjected to water pressure. 1. A full list of data sheets, including liquid applied systems, DPC & Cavity Trays and many more PDFs - available to view online or download. Seamless and fully bonded. 2. co. ) Tunnels and subway systems Construction joints Foundations Water retaining structures. MultiJoint is designed for use in all types of movement joints and construction gaps, to provide a waterproofing system between structural elements. CCL installed RIW Cementseal cementitious waterproof coating to pile heads, top of concrete ground beams and secant piles whilst RIW Cementfill FC was used to repair and make good the side of piles, prior to the application of RIW Cementseal coating. The presentation demonstrates all the necessary steps such surface preparation, priming, application of the product, and. Cementfill HB - Cement based waterproof high build repair mortar for profiling and providing fillets. Excellent chemical resistance. Cementseal is a two component, polymer modified, cement based, waterproof coating for concrete and masonry. About Us; Products +. co. Cementflex is a two component, polymer modified, flexible, cement based, waterproof coating for concrete and masonry. RIW Liquid GM Data Sheet. It is fitted around the perimeter of the floor at theRead The Hallmark case study by Ceren Balkanay on Issuu and browse thousands of other publications on our platform. Features and benefits: A rapid hardening, low density, high strength mortar with enhanced polymer properties. in accordance with the BS8102, as perching may occur exerting water pressure on the structure for intermittent. The RIW Cementseal provided an impact resistant application, which allowed the deck to be trafficked by subsequent trades without the risk of damage to the membrane. Basements can become damp, so you may need to treat any concrete areas with RIW cementseal to ensure they are waterproof. RIW Flexiseal was then overcoated onto the. Eye contact May cause irritation to eyes. Technical number: 01753 944200. Cementflex is a two component, polymer rich and flexible cement based waterproof coating for concrete and masonry, with excellent adhesion to prepared substrates. Consideration should be given to applying the DPM to the top of the slab, as the installation and moisture sensitive internal finishes are then protected from any residual moisture in the concrete. Product code : 82CAT. RIW Download. For most situations where internal floor areas are greater than 600mm below external ground level, additional protection may be required. The company is almost 100 years old and RIW stands for Remember It's Waterproof, which was the slogan of an advertisement for the company in 1921. RIW Download. Sales number: 01753 944210. The product is highly polymer modified and as a result concrete surfaces do not generally require a primer. A full list of data sheets, including liquid applied systems, DPC & Cavity Trays and many more PDFs - available to view online or download. RIW Cementseal is a cement-based, polymer-modified, two-component, coating that acts as. P305+P351+P338 - IF IN EYES: Rinse cautiously with water for several minutes. co. RIW Double Drain. Reinforced, loose laid, damp-proof and gas resistant membrane. The Code of Practice for waterproofing of below ground structures, also known as the British Standard BS 8102, has undergone updates. RIW in the UK has over 90 years experience in structural waterproofing. View more info. Category Concrete Repair. Play video. RIW Flexiseal was then overcoated onto the. 1. RIW . Verified by manufacturer 7 months ago . RIW Sheetseal GR . RIW Cementseal Primer – a ‘primer’ for use on all horizontal and porous surfaces. Upload: others. Cementseal is a two component, polymer modified cement based waterproof coating for concrete and masonry, with excellent adhesion to prepared substrates. RIW Sheetseal 226 is a cold applied, high density polyethylene film, coated with bitumen / rubber self adhesive layer with a removable reinforced silicone paper. Match case Limit results 1 per page. RIW Cementseal Primer benefits. RIW CEMENTFILL FC Cementfill FC is a thixotropic, polymer modified, cement based, waterproof , engineering quality fairing coat. Download BIM Sponsored RIW Gas Seal Black - Gas Resistant Membrane . Concrete surfaces: Should be pre-treated with Cementseal Primer to reduce the risk of leaching of free lime or mineral salts, and to avoid the. button. Excellent low temperature flexibility. View more info. For a surface sealant, RIW Cementseal is a two-component polymer for concrete and masonry substrates, which has superb adhesion. Aqueous acrylic copolymer that stabilizes the substrate and reduces the evaporation of water. 1 2. RIW Download Sponsored RIW Heviseal . Product code : 82CCSEALP. RIW Cementseal Data Sheet. Gas Proofing Systems [{product_related_downloads:count}] pdf. How to Specify. Concrete surfaces must be first treated with RIW Cementseal Primer, to reduce the risk of leaching of free lime or mineral salts. Highly porous substrates should be primed with RIW Cementseal Primer. Cementseal is a two component, polymer modified, cement based, waterproof coating for concrete and masonry. pdf), Text File (. Excellent low sag properties. RIW Cementseal Data Sheet. RIW Flexiseal 500 HG . BENEFITS l Totally waterproof l Resists up to 100m head of positive and negative water pressure l Seamless and fully bonded l Applied to damp surfaces l Abrasion and impact resistant l Quick and easy to. Flexible: Permanently elastomeric composite. A cold applied, high density polyethylene film typically used to provide a water and water vapour barrier in all forms of construction. Gas Seal Ancillaries Data Sheet. 6 company wide current stock level. DPM Blue is a three-layer, low density polyethylene damp proof membrane with a polypropylene reinforcing grid. RIW Cementseal provides enhanced resistance to carbonationRIW CEMENTSEAL Cementseal is a two component, polymer modified, cement based, waterproof coating for concrete and masonry. pdf; ESD04 floor wall detail bent. RIW Cementseal - Waterproof Coating System . Concrete surfaces: Should be treated with Cementseal Primer to reduce the risk of leaching of free lime or mineral salts, and to avoid the obstruction of the drainage system. com. Appropriate engineering controls Ensure adequate ventilation of the working area. Start here!. level above ground. RIW in the UK has over 90 years experience in structural waterproofing. Fully compatible with RIW waterproofing systems. About Us; Products + Browse by application. txt) or view presentation slides online. Jump to:. POA. Technical number: 01753 944200. DPM Blue; DPM Red; Sheetseal 226A full list of data sheets, including liquid applied systems, DPC & Cavity Trays and many more PDFs - available to view online or download. RIW Structureseal is a waterproofingRIW Cementflex. Pro SECTION Capping Beam Phase 1 RIW Structureseal RIW Sealing Compound around piles RIW Structureseal across bottom of pile cap, cut around piles Provide 2 layers of polythene sheeting over Structureseal, such that it does not bond to concrete RIW. waterproofing solutions, such as RIW Tilesafe and RIW Cement Based Coatings have been added to the range to complement classic systems such as RIW LAC; known throughout the industry as ‘two coats of RIW’. Cementflex is a two component, polymer rich and flexible cement based waterproof coating for concrete and masonry, with excellent adhesion to prepared substrates. RIW were asked to advise on waterproofing in the early stages of the design process by Jestico + Whiles. pdf. Cementseal Primer is required for all horizontal applications, and is also used on porous surfaces, prior to applying Cementflex. RIW Cementjoint – a flexible waterproof composite tape, for embedding in Cementseal, to reinforce joints etc. pdf. When embed- ded in RIW Cementseal, it gives a highly flexible, impermeable seal over ‘live’ cracks and expansion/ construction joints. Cementseal Primer is required for all horizontal applications, and is also used on porous surfaces, prior to applying Cementseal. Choose between our online CPD below, which focuses on Waterproofing At or Below Ground Level (BS8102:2009) or contact us to book an in-house session. Your product has been successfully added to your basketRIW CEMENTSEAL PRIMER Cementseal Primer is a multi-functional, water based primer/curing agent, formulated on an aqueous acrylic copolymer. Contact us: 01344 397777 technical@riw. NBS Source is the new home of the NBS National BIM Library - BIM objects and Revit families (free to download). Match case Limit results 1 per page. This self adhesive bitumen membrane turned up at the slab perimeter onto the waterproofed walls, completing the tanking. 0 company wide current stock level. co. Gas Seal Ancillaries Data Sheet. Showing 1-36 of 40. pdf. Data Sheets | Technical Downloads | RIW. Seamless and fully bonded. Permanently elastomeric composite membrane embedded in backing fabric, exhibiting over 600% elongation. Aqueous acrylic copolymer that stabilizes the substrate and reduces the evaporation of water. Two colour coded coats. RIW Cementfill HB 20kg. We are well known for our expert Technical Advisory Service, with both in-house and field Technical RIW CEMENTSEAL PRIMER Cementseal Primer is a multi-functional, water based primer/curing agent, formulated on an aqueous acrylic copolymer. Visit us at riw. pdf. This self adhesive bitumen membrane turned up at the slab perimeter onto the waterproofed walls, completing the tanking. RIW Cementseal . pdf. Technical number: 01753 944200. Upload: riw-ltd Post on 13-Apr-2017. Cementseal is used to prevent water ingress into basements, cellars and other below ground structures. RIW Aqua Channel A PVC drainage conduit designed to control water ingress in below ground structures. Products by RIW - We help design and project delivery teams keep water and ground gases out of buildings. It can be used to seal concrete and masonry substances. 0 downloadRIW Sheetseal 226 Self Adhesive Tanking Membrane. Call for Price. The product hydrates to form a. The product is highly polymer modified and as a result concrete surfaces do not generally require a primer. Nitocote CM210 White KIT (18. txt) or view presentation slides online. When designing Type A structures (as classified in BS8102:2009), the product applied correctly, is capable of providing the levels of protection required for Grades 1, 2 & 3. About Us; Products + Browse by application. Radon is a naturally occurring radioactive gas that is found within certain areas of the country and maps are available in BRE Digest 211 ; RADON. SECTION RIW Sheetseal 226; see Notes 5 & 6 RIW Sheetseal 226 to seal top of RIW Double Drain against vertical membrane RIW LAC; Provide reinforcing strips of RIW Sheetseal 226 where required / indicated RIW Double Drain; see Notes 1 & 2 Sub. pdf. RIW Cementjoint Data Sheet. Specification Guide: RIW WATERPROOFING SYSTEMS May 2014 4 l Specification Guide to RIW Waterproofing Systems Technical Expertise How to Specify Waterproofing RIW has been…Cementseal Primer is required for all horizontal applications, and is also used on porous surfaces, prior to applying Cementflex. net Lodge Farm Hook Road North Warnborough Hook Hampshire RG29 1HA The British Museum The British Museums’ new World Conservation & Exhibitions Centre required a comprehensive waterproofing solution to. Gas Seal Ancillaries Data Sheet. SKU: 014cfhb. or : for floor coatings, and / or temporary waterproofing - Number of coats : One - Thickness : 2mm overall. 2–2. Design Requirements • Architect: Frank Shaw Associates (Cambridge) Royal Winchester House is being developed as a 19The concrete sub-base should be a minimum of 20 N/ mm². RIW Cementseal Datasheet RIW Ltd 189 views • 4 slides CAPALAND PLUS - Cement Based Tile Adhesive for Professional Use CAPA India 27 views • 2 slides CAPA FLEX- Best Tile Gel Adhesive in India CAPA India 24 views • 2 slidesriw cementseal primer . This self adhesive bitumen membrane turned up at the slab perimeter onto the waterproofed walls,. Existing substrates and structural elements should be assessed for suitability to withstand any increase in applied loads from water pressure. pdf. pdf. RIW Cementseal Primer - 5 litre tin | £ 114. Product code : 82CCSEAL1. A full list of data sheets, including liquid applied systems, DPC & Cavity Trays and many more PDFs - available to view online or download. Gas Seal Ancillaries Data Sheet. RIW Flexiseal 500 HG Data Sheet. A list of approved stockists is available from RIW’s offices. The numerous interfaces and changes in level. RIW has been delivering reliable waterproofing solutions for 100 years. Search. pdf. RIW Cementseal is a waterproof coating that is used for concrete and masonry work. Both RIW Cementseal and RIW Cementflex were used: Cementseal’s robust abrasion resistant properties make it ideal for areas where tenants may walk on the gravel, moving it around. When using Cementseal, masking tape can be used to create an exposed joint by removing when the embedment coating is still wet. Below the concrete slab we recommended RIW Sheetseal 226. Specialising in offering the most expert technical advice for commercial waterproofing, damp proofing applications at any level. RIW Sheetseal 226 should be covered and protected to reduce the risk of damage from following works. RIW Download. The concrete sub-base should be a minimum of 20 N/ mm². BENEFITS l Totally waterproof l Resists up to 100m head of positive & negative water pressure l Tough & flexible to accommodate differential movement l Seamless & fully bonded l Applied to. Linkedin. pdf. RIW Sheetseal 226, RIW Toughseal, RIW Cementseal and RIW Waterstop. pdf. RIW Gas Seal HC Data Sheet. May also be used as a curing membrane. Abrasion and impact resistant. Permanently elastomeric composite membrane embedded in backing fabric, exhibiting over 600% elongation. When designing Type A structures (as classified in BS8102:2009), the product applied correctly, is capable of providing the. Solvent Free. Cementseal is used to prevent water ingress into basements, cellars and other below ground structures. Technical number: 01753 944200. Eye / face protection In case of splashing, wear:. Waterproofing above ground level;A full list of data sheets, including liquid applied systems, DPC & Cavity Trays and many more PDFs - available to view online or download. pdf. The product is resistant to salts and most chemical attack, and having good UV resistance, is suitable for use in exposed exterior applications. RIW Cementseal Primer Data Sheet. A full list of data sheets, including liquid applied systems, DPC & Cavity Trays and many more PDFs - available to view online or download. RIW Limited Arc House Terrace Road South Binfield Bracknell RG42 4PZ Tel: 01344 397777 Fax: 01344 862010 e-mail: technical@riw. Encon Construction Products offers a huge range of construction products & accessories, primarily for use in infrastructure and major building projects. Suitable for horizontal, vertical and overhead applications. CCL installed RIW Cementseal cementitious waterproof coating to pile heads, top of concrete ground beams and secant piles whilst RIW Cementfill FC was used to repair and make good the side of piles, prior to the application of RIW Cementseal coating. POA . 6 litres of clean water per 20 kg bag, depending upon desired. RIW, Arc House, Terrace Road South, Binfield, Berkshire G42 4PZ Call Technical: 01753 944200, Call Sales: 01753 944210. V. 6 litres of clean water per 20 kg bag, depending upon desired. Product name RIW 36A: RIW Cementseal Part A 1. Cementfill FC incorporates the most advanced microsilica, polymer and fibre technology, curing to provide high waterproofing properties, excellent protection from acid gases, chlorides and freeze/thaw cycles as well as enhanced chemical resistance. POA. RIW Sheetseal 9000 DPC 300mm x 20m. RIW Cementseal Data Sheet. U. Structural Waterproofing > RIW Waterproofing > RIW Cementseal Primer . POA . RIW Cementseal is a two component polymer modified cement based waterproof concrete sealer coating with excellent adhesion to prepared concrete and masonry substrates. View. pdf. Below the concrete slab we recommended RIW Sheetseal 226. The product is supplied as a single component system. RIW CEMENTSEAL PRIMER Cementseal Primer is a multi-functional, water based primer/ curing agent, formulated on an aqueous acrylic copolymer. Cementseal is a two component, polymer modified, cement based, waterproof coating for concrete and masonry. RIW Cementseal provides enhanced resistance to carbonation which in a costal environment is extremely important. RIW Cementseal is a two component polymer modified cement based water- proof concrete sealer coating with excellent adhesion to prepared concrete and masonry substrates. Relevant identified uses of the substance or mixture and uses advised against Description Two component cementitious coating. RIW Gas Seal HC Data Sheet. ‘The Mid Harbour Estate project is a government led social housing project in Gibraltar. Impermeable to water under 10 bar hydrostatic pressure, yet allows the free passage of water vapour. Features and benefits: A rapid hardening, low density, high strength mortar with enhanced polymer properties. co. Sales. phrases % ammonia <. RIW Sheetseal 9000 DPC 100mm x 20m. Customer Sales 01753 944210. RIW Cementseal Primer is a water-based primer and curing agent that can be applied to damp surfaces. Gas Seal HC CE Mark DoP. pdf. SKU: 014csp. Tekcem 025 Industrial SETTING NEW LEVELS The Screed Development Centre Unit5 The Business Centre, Barlow Drive, Winsford, Cheshire CW7 2GN Sales: 03300 555 227 Technical: 03300 553 714 OVERVIEW Tekcem 025 Industrial is ideal for application over sound substrates. Cementseal - cement base waterproof coating applied by hand or spray as a continuity membrane through the foundation bearing plane. We were approached to carry out the. RIW LTD 580 / 581 Ipswich Road, Slough, Berkshire, SL1 4EQ, UK T: +44 (0) 1753 944200 E: technical@riw. treated with RIW Cementseal Primer, to reduce the risk of leaching of free lime or mineral salts. The RIW product range has expanded and evolved Cementseal Primer is required for all horizontal applications, and is also used on porous surfaces, prior to applying Cementseal. RIW Cementfill HB – a waterproof high build repair mortar for profiling and providing fillets. DPM Blue is a three-layer, low density polyethylene damp proof membrane with a polypropylene reinforcing grid. star. Structural Waterproofing, Basement Tanking & Damp Proof Membranes. Cementflex was used at horizontal and vertical junctions to reinforce the Cementseal against differential movement. P304+P340 - IF INHALED: Remove person to fresh air and keep comfortable for breathing. The concrete sub-base should be a minimum of 20 N/ mm². The cementseal is what RIW recommend for internal tanking. BENEFITS Applied to damp. Call for Price. Good. RIW takes care of your waterproofing strategy from start to finish, including technical advice and guidance, preparation of sectional details, approval of drawings, site inspections and ongoing site support. RIW Cementjoint – a flexible waterproof composite tape, for embedding in Cementseal, to reinforce joints etc. RIW Cementfill HB is highly polymer modified and as a result concrete surfaces do not generally require a primer. Gas Seal Black; Gas Seal HC; Liquid GM; Sheetseal GR; Structureseal GPT;. Cementseal NBS Clause. 12m. All surfaces must be free from all unsound material, rust and organic growth. Sheetseal 226 is typically used to provide a water and water vapour barrier in all forms of construction, particularly where large unobstructed areas are to be treated. RIW in the UK has over 90 years experience in structural waterproofing. Compare this product to another (up to 4 items) Quantity. A full list of data sheets, including liquid applied systems, DPC & Cavity Trays and many more PDFs - available to view online or download. RIW Cementfill FC. Application rate: Normal applications: 2. RIW has a broad range of high performance structural waterproofing products. Please call the Sales line for more information on 01753 944210. the retaining walls were stepped. Request Callback; 01753 944200; [email protected]. 56 (inc. RIW Cementseal. Product code : 82CSS226. RIW CEMENTFLEX Cementflex is a two component, polymer modified, flexible, cement based, waterproof coating for concrete and masonry. 3. Features & Benefits of Cementseal. piles, prior to the application of RIW Cementseal coating. RIW has a broad range of high performance structural waterproofing products. Identification code: Surface protection system for protection of concrete against ingress – Rigid trafficked system 2. Verified 7 months ago . Your product has been successfully added to your basketRIW CEMENTSEAL Cementseal is a two component, polymer modified, cement based, waterproof coating for concrete and masonry. RIW Cementseal Primer Data Sheet. When embed- ded in RIW Cementseal, it gives a highly flexible, impermeable seal over ‘live’ cracks and expansion/ construction joints. uk website: British Board of Agrément tel: 01923 665300 Bucknalls Lane fax: 01923 665301 Watford e-mail: mail@bba. A single component cementitious high build mortar, which incorporates the most advanced cement chemistry, microsilica, fibre and styrene acrylic copolymer technology. RIW Cementseal Primer Data Sheet. Post on 02-Oct-2021. Gas Proofing Systems [{product_related_downloads:count}] doc. RIW has over 90 years experience in structural waterproofing within the UK. BENEFITS l Totally waterproof l Resists up to 100m head of positive and negative water pressure l Seamless and fully bonded l Applied to damp surfaces l Abrasion and impact resistant l Quick and easy to apply by hand or. 2. Technical number: 01753 944200. The forces are generally distributed equally into the piles, but piles are not always installed in the. Sheetseal 9000 DPC; Sheet Applied Systems. BSSP 10 Fosroc 18 Tarmac 4 Weber 7 DCP 6 Flexcrete 10 Ultracrete 3 Sika 4 Parex 5 Nufins 4 Ardex 6 Ronacrete 14. Address. co. Can be used on damp surfaces. RIW Cementfill HB – a waterproof high build repair mortar for profiling and providing fillets. 14 views. Jump to: Specification data ; Add to spec +44 (0)1753 944200. l Totally waterproofl Resists up to 100m head of positive & negative water pressure l Tough & flexible to accommodate differential movementl Seamless & fully bondedl Applied to damp surfaces. The Code of Practice for waterproofing of below ground structures, also known as the British Standard BS 8102, has undergone updates. pdf. Royal Winchester House, Bracknell Case Study. Start here! particular to overlap Cementseal on the transition from foundations up to DPC level. 6 litres of clean water per 20 kg bag, depending upon desired. ingredient concentration cas number hazard r. P305+P351+P338 - IF IN EYES: Rinse cautiously with water for several minutes. RIW Sheetseal 226. RIW Ltd Arc House Terrace Road South Binfield Bracknell Berkshire RG42 4PZ Tel: 01344 397777 Fax: 01344 862010 e-mail: [email protected] full list of data sheets, including liquid applied systems, DPC & Cavity Trays and many more PDFs - available to view online or download. This voluntary-aided school in Hackney was part of the BSF programme. Technical Hotline 01753 944200. Cementseal Primer is required for all horizontal applications, and is also used on porous surfaces, prior to applying Cementflex. Gas Seal Black Data Sheet. 2. The cementseal is what RIW recommend for internal tanking basement refurbishment, it's good for 100m head positive/negative water pressure apparently.