DOCSLIB.ORG

Unit 11 Water and Damp Proofing

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Unit 11 Water and Damp Proofing UNIT 11 WATER AND DAMP PROOFING Structure 11.1 Introduction Objdvea 11.2 Principles of Water Proofing 11.3 Procedure for Damp Proofing~WaterProofing 11.4 Dampness and Leakage 1 1.4.1 Signs of Dampness 11.4.2 Detection of Dampaess 11.5 Causes of Dampness 11.5.1 Condensation 1 1.5.2 Rain Penchation 1 1.5.3 Built-in Water 1 1.5.4 Pipe Leakage 11.5.5 Spillage 11.5.6 Seepage I 1.5.7 Rising Dampness 11.5.8 Hygroscopic Salts 11.6 Prevention of Dampness 11.6.1 Planning and WinStage 1 1.6.2 Constmction Stage 1 1.6.3 Remedial Meatjures and Treatment 11.7 Dampness in Old Structure and Remedial Measures 11.8 Water Proofing 1 1.8.1 Integral Water Proofing 1 1.8.2 Surface Treatments 1 1.8.3 Metallic Water Proofing 11.9 Different Methods of Waterproofing and Case Studies 1 1.9.1 Water Proofing Basements 1 1.9.2 Polyma Plaster for Roof and Hm- PROOFSOL 1 1.9.3 Wat,er Proofing of Roofs -Nina Industries Method 11.9.4 \V&r Proofing by Algiproothg Method 1 1.9.5 Case Studies 11.10 Spectrum of New Water Proofmg MaterialslSystems 11.11 Summary 11.12 Answers to SAQs 11.1 INTRODUCTION You have already learnt about strengthening of stone and brick masonry and about repair of floors, in previous blocks. Now in this unit, dampness and water leakage in buildings their causeslreasons and ways and methods to avoidlprevent them is dealt with. Dampness and water leakages in buildings is a serious concern of Civil Engineers all over the world. In spite of proper supervision during construction, buildings are still affected by these problems. Building materials such as bricks, concrete, plaster, timber etc., have a moisture content which under normal circumstances is no cause for concern. ?be rise in moisture content of these materials to a level where it becomes visible or when it causes deterioration is the real dampness. Objectives At the end of this unit, you should be able to: know methods to detect dampness, find the causes for dampness, know the methods adopted to prevent dampness, and Repair & Preventive understand the various types of water proofing methods. Maintenance Techniques Thus you will be able to guide the artisans to take care during construction to avoid dampnegs and provide correct water proofing. Definition I Dampness is defiid as presence of moisture in air or on surface or diffused I tbrough solid. Any indication of slight wetness or moisture is termed as dampness. 112 PRINCIPLES OF WATER PROOFING Most of be building materials used in construction are exposed to water and are not impervious and do allow water to enter into their systems. Sometimes the building materiais may be good but the bondihi materials like mortar may be pervious and may permit water inside. Cracks occur due to expansion and shrinkage of construction material which in turn form voids which allow water to pass through. Some materials absorb water from outside. Thus the: basic principle involved to prevent dampness and avoid water proofing problems is to make construction materials voidsfree and avoid voids formation after the construction. If porous materials are unavoidable they have to be made impervious with materials in the pore filling class or covered completed with impervious layers to repel water. The pore filling materials fill in the voids, expand because of chemical reactions and thus enSure water dghtness. 113 PROCEDURE FOR DAMP PROOFINGIWATER PROOFING a) The source of dampness involk,d is to be established. b) If any hydrostatic pressure is involved including uplift pressure, measures to counter this pressure are to be adopted. c) The most common construction material, concrete must be fully compacted while casting. d) Decide whether water proofing is to be on the positive sidelface, i.e water face or on the opposite si& depending upon the construction details. e) Decide about the water proofing system-pore filling or repelliint. f) Follow instructions by the manufacturer in respect of specific materialslfiystemsused. 11.4 DAMPNESS AND LEAKAGE 11.4.1 Signs of Dampness In case of dampness it is very important to maintain a complete record from the period when it is first noticed. If it can be established that the occurrence of dampness is related to temperature or weather, this can help significantly in limiting the possible causes of the trouble. Signs of dampness which are directly evident are a) Stains on different surfaces of buildings. b) Visible water such as a fhofmoisture or drops of water on a surface. Bad smell, mould, insects, salts and other corrosion products also testify to the presence of dampness. Detachment and falling of paint films, wall papers, plaster, timber, ceiling plaster are indicative signs of dampness. Displacement of parapets, wall tiles, floor tiles and cracking of glass dwalls, also take place due to dampness. 11.4.2 Detection of Dampness There is no limit to the size of a dampness stain. One of the ways of telling whether a dampness stain is still active is to remove any growth of mould or efflorescence after a record hds been ma& of the condition and to see how much it returns before the next inspection. This way it can somet-s be determined whether the dampness is decreasing or increasing. Similarly it can be useful to draw a pencil line around the outline of the Water & ~~mp~~ooting dampness stain and to date it. The size of the stain depends on the material behind the surface. The shape of stain is not only informative but can also be conclusive. 'rhe crescent shape in the comer of a surface is conclusive evidence of condensation while the convex shape of a stain indicates that the source of water is other than cbndensation. 11.5 CAUSES OF DAMPNESS Dampness in buildings is generally due to bad design, faulty construction andor poor materials used. Structures built on high ground and well drained soil are far less liable to suffer from foundation dampness than those built on low-laying water logged areas where a sub soil of clay or peat is commonly found through which dampness will inevitably rise unless properly treated. A sub-soil through which water can easily pass such as fm gravel,m., sandy soil or a soil containing light clay, will usually keep the foundations fairly In coastal towns walls are particularly prone to seepage because of the high humidity and salt particles in the atmosphere. Since salt absorbs water, the walls become damp. When that happens, the plaster peels off, exposing the steel reinforcement. In course of time, the steel is corroded, further weakening the structure. The sand mixed with cement for the reinforced concrete is also sometimes salt-contaminated,endangering the life of the structure. Leaks generally occur from the sanitary fittings. In new constructions, leaks are due to inadequate curing of the concrete, substandard quality of the concrete etc. The various causes for dampness are explained below: 11.5.1 Condensation The deposition of moisture from the atmosphere, either internal or external, on relatively cold surfaces. Condensation takes place on surfaces at temperatures below the dew point. Internal air should be allowed to circulate by providing proper ventilation especially in closed rooms. 11.5.2 Rain Penetration Penetration of rain water in a structure takes place due to usage of defective materials, faulty designs, or construction techniques. AU constructional defects allowing penetration of rain water in any part of the structure should be immediately rectified. The building should be dried thereafter by natural ventilation, by keeping the windows open or by using suitable heaters. Dehumidifiers may be used keeping the windows closed. Fast drying methods which affect timber joints, plaster, paint and wall papers, etc., should be avoided. 11.5.3 Built-in Water The presence of water which has been enclosed with the structure during ,the construction I process, such as water used in mixing concrete, mortar, plaster, water from atmosphere like rain, snow, frost and dews. Large quantities of water used during construction evaporate into the internal air of a building and become available for condensation In I unoccupied new buildings, this effect is felt more. The problem may, however, disappear 1 completely within two years, excepting in the case of water entrapped within the roof of the structure. The remedy lies in drying out the affected areas of the building and providing good ventilation. ' 11.5.4 Pipe Leakage The leakage of water from water supply line or drains and trenches. Leakage from a water supply line or rainwater pipes or a drainage systems, if not attended to in time, proves to be an effective source of dampness. Such leakages should immediately be repaired and I water collecting near the fault point drained off. ' 11.5.5 Spillage I The spillage of water from industrial and domestic activities is an active source of dampness. similarly, waste waters are contributed by dwellings and industrial buildings I I Rep& & Preventive als?. To check spillage of water, remedial measures like the provision of proper drainagc Msintenaoce Techniques should be ensured. 11.5.6 1 Seepage The passage of wateran or in the ground through structure wholly or partly laid undergnbund. Seepage in buildings takes place due to passage of water wholly or partly below the ground water. Proper care during construction can make the structure ~eepage~fiee.External and internal drainage systems should be fitted with all possible care. 11.5.7 Rising Dampness The sloy rise of water from the ground up into the wallslfloors due to defective or missing damp-proofing coursesltreatments.
Load more

Recommended publications
  • Damp-Proofer & Waterproofer
    Damp-Proofer & Waterproofer AQUAPRUFE Date: 03 October 2016 Fact Sheet No.: TDS00461 YOUR SMART ADVANTAGES and out of direct sunlight. Protect from frost. For concrete and brick walls & floors TYPICAL PERFORMANCE DATA (Approx.) Can be applied to damp surfaces Application +5°C to +35°C Temperature Brush on Viscosity 4000-9000 MPas USES Drying Time Approx. 24 hours per coat depending Bostik Aquaprufe Damp-Proofer & Waterproofer is a on drying conditions. However flexible, cold applied, odourless, rubber enriched bitumen product always remains tacky emulsion for use both internally and externally. Coverage Floors: 1.25m2 per litre per coat Bostik Aquaprufe Damp-Proofer & Waterproofer provides a highly efficient sandwich damp-proof membrane for floors Walls: 2m2 per litre per coat - Bostik Aquaprufe Damp-Proofer & Waterproofer must be overlaid with a minimum 50mm flooring screed. It also acts Depending on application technique as a waterproofer for walls when plastered or plaster and ambient conditions boarded over. Bostik Aquaprufe Damp-Proofer & Waterproofer must always be covered as it remains tacky. Solvent for Cleaning Warm soapy water whilst still wet Up White spirit when dry PRODUCT CHARACTERISTICS Colour Dark Brown, dries black DIRECTIONS FOR USE IMPORTANT: Before using Bostik Aquaprufe Damp-Proofer Form A structured liquid & Waterproofer refer to the relevant Health & Safety Data Sheet, available at www.bostik.co.uk. Specific Gravity 1.0 approx. PREPARATION Composition Bitumen and rubber latex aqueous 1. Bostik Aquaprufe Damp-Proofer & Waterproofer dispersion should be applied to slightly damp, not wet surfaces. Do not apply outdoors when raining or if there is risk of Product Codes 30812206 2.5 Litre x 6 rain, frost, fog, or dew before Bostik Aquaprufe Damp- 30812207 5 Litre x 4 Proofer & Waterproofer has dried.
    [Show full text]
  • Omnimat Flexible, Damp-Resistant And
    WD OMNIMAT DECOUPLING MEMBRANE FLEXIBLE, DAMP-RESISTANT AND WATERPROOF MAT, WITH ACCESSORIES FOR LAYING UNDER TILES Characteristic product properties n Very good chemical resistance. n Suitable for surfaces that are sensitive to moisture, such as wood, plasterboard and plaster coatings. n Only a very thin 0.4 mm layer is required. n Can be used on walls and floors. n Suitable for interior and exterior use under certain conditions. Applications Using WD omnimat and these accessories ensures a perfect damp-proof seal and decoupling under tiles and natural stone. The mat has very good chemical resistance and can easily be used on surfaces that are sensitive to moisture, such as wood, plasterboard and plaster coatings. Showers, bathrooms, sports facilities, spa facilities and areas affected by intense moisture are just a few examples of how it can be used. If you would like to use it in swimming pools and other specific applications, we recommend that you contact us. Appropriate surfaces n Anhydrite (white powder adhesive) n Approved fibre-plaster boards n Brick (white powder adhesive) n Existing tiles n Pressed wood fibres/underlayment n Concrete n Multiplex wood n Concrete blocks n Lime-cement coating n Cellular concrete n Sand-limestone n Cement coating n Ceramic interior bricks n Cement screed n Cork n Cement screed with underfloor heating n O-BOARD n Electric underfloor heating n Polystyrene board n Epoxy coating n Decorative coating n Plaster coating (white powder adhesive) n Silicate board n Plaster blocks (white powder adhesive) n Stone carpet n Plasterboard n Paint n Approved fibre-cement boards n Wall heating For specific details, please refer to our “General instructions for surfaces”.
    [Show full text]
  • Thermal and Moisture Protection: Keeping the Weather out Internet Course
    Rich Text Editor,editor1 http://www.licensetobuild.com/web-class/controls/?mt=coursemanagem... Thermal and Moisture Protection: Keeping the Weather Out Internet Course Learning Objectives Summarize the key elements (either natural or mechanical) of a properly ventilated structure. List and describe at least three specific installation techniques and/or materials that contribute to a properly constructed roof system. Outline at least one design strategy based on "best practices" for the construction of buildings in areas with high humidity. Identify and implement proven methods that will effectively divert moisture from the foundation of a structure. Keeping the Weather Out Protecting buildings from weather and moisture related problems is important for all building professionals. In areas of high humidity, (and ALL Florida counties are considered "warm humid counties" by the Florida Building Code: Energy Conservation 301.2), it is even more important that builders, their employees, and their subcontractors use “Best Practice” procedures to carefully install thermal and weather resistant components. Because of the potential for loss due to consumer complaints and claims, it makes sense for contractors to be trained in moisture control for the homes and buildings they are constructing or renovating. Major performance objectives. One objective of a building envelope system is to provide moisture control. Construction of a building envelope system needs to incorporate methods and materials that prevent or minimize the impact of moisture intrusion. The photo below shows typical damage caused by poorly installed or maintained building envelope components! Too often, exterior shells are simply sealed up without regard for proper installation of house- wraps, flashing and ventilation.
    [Show full text]
  • Lime Plaster & Plaster Lath for Damp Buildings
    Lime Plaster & Plaster Lath for Damp Buildings Lime Plaster & Plaster Lath for Damp Buildings Surveying for Damp Issues with Historic Buildings. Buildings fall into two categories for the purposes of surveying for damp: I. Modern buildings built with a damp proof course and barriers to rainwater penetration. II. Old buildings built prior to mid to late 19th century depending upon the region of the country. Old buildings relied on the walls breathing and shedding moisture before damp became a problem. Damp Proofing Old Buildings In old buildings, walls were built to such a thickness that normally damp would not penetrate to the inside. The joints were always of lime mortar or earth and were more porous than the building’s structural elements comprising brick, stone etc. Consequently the joints would drain and shed water by evaporation, therefore not allowing damage to these structural elements. The joints were the sacrificial element of the building. Because lime and earth mortars are so porous, timber in contact with these mortars is less prone to decay than when bedded in cement mortar. Historic houses, when built, were able to breathe and shed water. They were also heated by coal or log fires in an open fireplace which promoted rapid air changes by way of air being drawn out through the chimney. Windows and doors were not sealed as they are today allowing air movement into and out of the building. Internal finishes were lime washed which allowed surfaces to breathe and, although it would discolour when damp, it would not peal off the wall like wall paper nor blister like modern paint.
    [Show full text]
  • Model Building Bye Laws Brought out in 2004
    ,2016 Revised and Published in 2016. © Ministry of Urban Development, Government of India, 2016 Material from this publication may be used for educational or other purposes with due credits. Overall guidance Sh. Neeraj Mandloi, IAS. Joint Secretary, Ministry of Urban Development, Govt. of India Technical Team TCPO Late Sh. J.B. Kshirsagar. Former Chief Planner Sh. R. Srinivas TCP (Head), MUT Division Sh. Sudeep Roy Assistant TCP Ms. D Blessy Assistant TCP Stakeholders in Consultative Workshop Central Governments agencies/ Institutes: National Disaster Management Authority Bureau of Indian Standards National Building Construction Corporation National Remote Sensing Centre Delhi Development Authority National Capital Region Planning Board Indian Institute of Public Administration Municipal Corporation of Delhi (South) Housing and Urban Development Corporation Schools of Planning and Architecture State Government Departments State Town and Country Planning Departments Selected Urban Development Authorities Selected Urban Local Bodies. Associations like CREDAI and NAREDCO Expert Review Prof. Dr. PSN Rao Chairman, Delhi Urban Arts Commission. New Delhi PRELUDE Building Bye-Laws are legal tools used to regulate coverage, height, building bulk, and architectural design and construction aspects of buildings so as to achieve orderly development of an area. They are mandatory in nature and serve to protect buildings against fire, earthquake, noise, structural failures and other hazards. In India, there are still many small and medium sized towns which do not have building bye-laws and in the absence of any regulatory mechanism, such towns are confronted with excessive coverage, encroachment and haphazard development resulting in chaotic conditions, inconvenience for the users, and disregard for building aesthetics, etc.
    [Show full text]
  • 10 Year Solution – Exterior Walls
    Summary - 10 year solution – exterior walls Remove plaster up to 1.2m above DPC line Re-glue brittle bricks with Dampsure GlueBack Drill 12mm dia holes one brick above highest ground level, min 100mm apart Inject chemical DPC Cream stopping future rising damp Waterproof wall where plaster was removed with Dampsure Dampcrete47 – prevent retained moisture to permeate into new plaster Apply mixture of Bonding Liquid with river sand to waterproofed wall Re-plaster with Dampsure Plastersure Plaster Additive – capillaries in plaster are rubberised and Salt Neutraliser prevents forming of efflorescence (bubbling of paint) Put a Dampcrete47 waterproofing sock onto new plaster Paint 28 days after remedial work was done The diagram below depicts the process to be followed: Dampsure is achieving phenomenal damp proofing results with its 10 year rising damp solution. This recipe has been designed in Europe to fix rising damp problems. This recipe is long lasting and has stood the test of time. Dampsure has had no comebacks or failures on the above recipe. Dampsure Cnr Hendrik Potgieter & Gordon rd, Florida 083 501 0060 Recipe - Rising damp – 10 year solution Preparation Warning!! before You are going to work with moisture and products that may damage floors and furniture. starting with Cover all tile floors, paving etc with plastic to minimize moisture and or chemical damage project and or water ingress Tape aluminium window and door frames with yellow aluminium tape Cover window panes with plastic Tape all pipes and fittings on walls Close all electrical points with waterproofing tape or plastic Remove all skirting and fixtures that are in the area that will be treated Identify the areas where water pipes and electrical wires might be damaged by drilling or chipping, mark these area and handle these areas with care.
    [Show full text]
  • Practical Building Conservation
    ENGLISH HERITAGE PRACTICAL BUILDING CONSERVATION BUILDING ENVIRONMENT ENVIRO27JULY2014.inddENVIRO 27 JULY 2014.indd a 29/07/2014 00:00 © English Heritage 2014 All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise without the prior permission of the publisher. English Heritage has asserted their right under the Copyright, Designs and Patents Act 1988 to be identified as the author and editor of this work. English Heritage 1 Waterhouse Square 138–142 Holborn London EC1N 2ST Published by Ashgate Publishing Limited Ashgate Publishing Company Wey Court East Suite 420 Union Road 101 Cherry Street Farnham Burlington Surrey GU9 7PT VT 05401-4405 England USA www.ashgate.com British Library Cataloguing in Publication Data Practical building conservation. Building environment. 1. Building materials–Environmental aspects. 2. Weathering of buildings. 3. Historic buildings– Conservation and restoration. I. English Heritage. 720‘.288-dc22 Library of Congress Control Number: 2001012345 ISBN-13: 9780754645580 ENVIRO 27 JULY 2014.indd b 06/08/2014 09:51 To the memory of John Ashurst (1937–2008), an inspiration and friend to all the editors, whose encouragement and support was a great motivation for this new series of Practical Building Conservation. ENVIRO 27 JULY 2014.indd c 29/07/2014 00:16 ENGLISH HERITAGE PRACTICAL BUILDING CONSERVATION BUILDING ENVIRONMENT Series Editors: Bill Martin and Chris Wood Volume Editors: Robyn Pender, Brian Ridout, Tobit Curteis ENVIRO 27 JULY 2014.indd i 29/07/2014 00:20 ii NOTES ON VOLUME EDITORS & CONTRIBUTORS Volume Editors & Principal Authors: Robyn Pender, Brian Ridout, Tobit Curteis Dr Robyn Pender is a Senior Architectural Conservator in the Building Conservation and Research Team at English Heritage, and serves on the Cathedrals Fabric Commission for England.
    [Show full text]
  • Damp Proofing Footing , Columns
    Roof shingles Ridge vent Ridge Board Cap with roof shingles. Pitch of roof Felt paper Drip edge 5/12 Sheathing , roof Sheathing, wall Ice & shield Strong back Insulation , ceiling Bridging Exterior Baffles Collar tie Rafter Finish Gutter Top Underlayment plates Fascia Sheathing , floor Ceiling Joist Support ( Sub-floor ) Support Soffit / vented Header header , Drywall, ceiling window or door Hurricane tie Stud Drywall , wall Window Sill Strapping Shoe Interior partition Cripple stud metal Stud Floor joist House Wrap Box Grade Insulation , wall Bridging Span Girder Sill Insulation , floor Sill sealer Slab Drain pipe, Anchor downspouts , bolt Gravel solid Lally Damp proofing Column Plastic , vapor Drain pipe, barrier foundation , perforated Foundation Soil , compacted Footing , foundation Footing , columns MaterialMaterial Description Function Alphabetical order AnchorAnchor Bolt Bolt Galvanized J- shape bolt, 1/2” dia. ( 8” – 16” long ) , treaded on top with galvanized washer & nut. Secures wooden sill to concrete foundation. BafflesBafflesBaffles Plastic or Styrofoam , pre made to fit between rafters , slightly contoured to create a cavity Creates a barrier ( Air-Flow ) between roof & insulation BridgingBridging Wood installed perpendicular to either floor or ceiling joist at mid span. Unites joist thus distributes the weight , prevents joist from twisting BoxBox Outer perimeter floor member , single when perpendicular to floor joist , double when parallel. Structural member , supports weight of exterior walls . CeilingCeiling Joist joist Wood structurally member , varies in size based on span , usually installed 16” on center. Prevents exterior walls from bowing out , nailing surface for drywall CollarCollar Tie tie Wood framing ( usually 2” x 4” or 2” x 6 “ or 1” x 6” ) , secured to opposing rafters.
    [Show full text]
  • Moisture Control Guidance for Building Design
    www.epa.gov/iaq/moisture Foundations Issue control the surface flow of water, or meet a more stringent local building code requirement. Applying Building foundations are vulnerable to moisture this slope to a distance of 6 to 10 feet from the problems for a number of reasons, including: foundation generally is acceptable. • Reduce water infiltration into the soil surrounding • Water from rain and from plumbing leaks is drawn the building using a barrier at or slightly beneath by gravity to foundations, which are exposed to the surface (e.g., a cap of silty-clay soil or surface water, rain-soaked soil and, possibly, high subsurface drainage landscape membrane). Care water tables. must be taken to prevent the roots of plants in this • Water may condense on foundation materials during zone from penetrating the barrier. warm weather because the materials are cooler than • Design the foundation and surrounding grade the outdoor air. so there is a minimum of 8 inches of exposed • Crawl spaces and basements are holes in the foundation after the final grading. ground and have more extensive contact with soil than slab-on-grade foundations. Guidance 2: Design below-grade drainage systems to divert water away from the foundation and specify • Many moisture problems can be avoided by properly capillary breaks to keep water from wicking through designing the foundation. Moisture problems the foundation to moisture-sensitive materials (e.g., associated with improperly designed foundations wooden framing and paper-covered gypsum board). can be difficult and expensive to identify and fix, can create the potential for health problems resulting from mold growth, and can be a liability Slab-On-Grade Liquid Water Control (See Figure 2-2) for building owners.
    [Show full text]
  • Damp Proofing Or a Damp Proof in Construction Is a Type of a Moisture
    DAMP PROOFING Damp proofing or a damp proof in construction is a type of a moisture control applied to building walls and floors to prevent moisture from passing into the interior spaces. Dampness problems are among the most frequent problem encountered in residences. MATERIAL USED FOR DAMP PROOFING 1. Property of the material An effective damp proofing material should have the following properties 1. It should be impervious. 2. It should be strong and durable and should be capable of withstanding both dead as well as live loads without damage. 3. It should be dimensionally stable 4. It should be free from deliquescent salts like sulphates chlorides and nitrates 5. The material should be reasonably cheap. 6. The material should be such that it is possible to carry out leak proof joining work. 2. Classification of material The materials commonly used to check dampness can be divided into the following four categories a) Flexible material Material like bitumen felts (which may be Hessian based or fibre/glass fibre based), plastic sheeting (polythene sheet) etc b) Semi rigid materials Materials like mastic asphalts or combination of materials or layers. c) Rigid materials Materials like first class bricks, stones, slates, cement concrete etc d) Grout materials Grout consists of cement slurry and acrylic based chemical or polymers. 3. Material used for damp proofing Following are the materials, which are commonly used for damp proofing. 1. Hot bitumen This is a flexible material and is placed on the bedding of concrete or mortar. This material should be applied with a minimum thickness of 3 mm.
    [Show full text]
  • Damp Proofing Material
    Damp Proofing Material 1- Flexible Materials: The materials, which do not crack and deform their shape when subjected to loading, are called Flexible Materials a- Bitumen Mastic (Mastic Asphalt) It consists of asphalt or bitumen mixed with fine sand in hot state to form an impervious mass. Due to this consistency it can be spread (when hot) to a depth of 2.5cm to 5cm, which sets on cooling. It provides good impervious layer but special care is needed in its laying. b- Bitumen Felts (Sheets): It consists of 6mm thick sheet of bitumen prepared in rolls having width equal to that of brick wall. c- Hot laid Bitumen: This material is used on a bedding of cement concrete or mortar. This should be applied in two layers at the rate of 1.75kg/ m2 of the area. d- Metal Sheets: Metal sheets of Copper, Aluminum, or Lead are used to prevent dampness, but they are costly. Sheets of these materials are used through out the thickness of the wall. The sheets of Lead are laid over Lime Mortar and not with Cement Mortar due to the chemical reaction of Cement over the Lead. The sheets of metal should be coated with asphalt. The thickness of the sheets should not be less than 3mm. 2- Rigid Materials: The materials, which do not resist transverse stresses and cracks when subjected to sever loading, are known as Rigid Materials. a- Rich Concrete 1.2cm to 4cm thick layer of Rich Concrete (1:2:4) painted with two coats of hot bitumen is used as horizontal D.P.C.
    [Show full text]
  • Brochure Industry Object
    Tiling for industrial, commercial & residential construction Specialist systems for the professional tiler Tiling systems for industrial, commercial & residential construction Specialist systems for professional tilers Expert Building Materials www.botament.com Tiling Wet Spaces Spas, Pools and Bathrooms • Public Showers 6 - 7 • Swimming Pools 8 - 9 • Spas (Wellness Facilities) 10 - 11 Industry • Industrial Kitchens 12 - 13 • Food & Drinks Industry 14 - 15 • Car Wash Plants 16 - 17 • Application Details - Wet Spaces 18 - 23 Tiling Requiring High Mechanical Strength • Factories and Warehouses 24 - 25 Electrically Conductive Tiling • Work Areas With Electrically Conductive Tiling 26 - 27 • Application Details Electrically Conductive Tiling 28 - 29 • Regulations 30 - 31 The information provided here as product description is based on our experience and is given to the best of our knowledge, but is non-binding. All instructions must be adapted to suit the individual building projects, the application purpose and the specific local conditions. To achieve optimal results we recommend carrying out a site-specific test application first. In any 2 case, the generally accepted technical rules must be adhered to. Tiling for industry and commerce. A job for professional tilers alone! Tile fitting in industrial kitchens, swimming Our effective and easy to understand product pro- pools, production halls and other specialist areas gramme, consisting of components that have been not only demand the highest level of professio- developed to build harmonised systems, offer our nal skill, fitters also have to have detailed expert customers the highest level of application security, to- know how of all applicable requirements and sta- gether with the highest degree of flexibility - all thanks tutory guidelines valid at the time of fitting.
    [Show full text]