detailed specification for damp proof course

DPC- Damp Proof Course A damp-proof course (DPC) is a horizontal barrier in a wall designed to resist moisture rising through the structure by capillary action - a phenomenon known as rising damp. 107 0 obj <>/Filter/FlateDecode/ID[]/Index[88 48]/Info 87 0 R/Length 98/Prev 117119/Root 89 0 R/Size 136/Type/XRef/W[1 3 1]>>stream Damp proof course or DPC is a major process in construction. Rising damp is the effect of water rising from the ground into property. S1 S2 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 . Damp proof courses (DPC's) are built into properties to prevent the movement of ground moisture through the wall and prevent deterioration of internal fixtures and fittings and also to prevent high levels of moisture leading to wood rotting fungi. Felt for damp-proof courses shall be bituminous 3-ply felt to BS 743, Type A. 2. Render below damp course. Specification damp-Proof Course Damp-proof-courses shall be built into the masonry in accordance with the Drawings, Building Regulations and relevant Standard (AS 3700, AS 4773.1, AS 4773.2). Houses are usually built with a damp proof course (DPC), just above floor level, to prevent moisture rising up, but if this has failed, or the property did not have a DPC, then rising damp can occur. Find out more. h�bbd```b``Z "+��* "Y�I}ɬ f��ٜ`��< &w�H�� i�dL�� fj��B ��a�� %�30�|` z�h Definitions and characteristics 4.1.Damp proof is installed in accordance with work drawings and manufacturer specification. endstream endobj 89 0 obj <>/Metadata 2 0 R/Pages 86 0 R/StructTreeRoot 6 0 R/Type/Catalog>> endobj 90 0 obj <>/MediaBox[0 0 595.44 841.68]/Parent 86 0 R/Resources<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI]/XObject<>>>/Rotate 0/StructParents 0/Tabs/S/Type/Page>> endobj 91 0 obj <>stream Definitions and characteristics For convenience the CAD drawings are divided into the following categories: Damp-proofing above ground / Radon protection; Externally-applied basement waterproofing It should be impervious. �D�3KR�d١��}(�%��3�#�Cƙ��2!8ӡ�S0k4��S1�$)`��p\B�$8��v�UEə�QA0iJɤ�8Y*6�f2�d HZ�Lq:T:��!�xQ�v)ΔƴP�)k ��TAG)��&AC0��}L6wYQ�H�`��&��LK��Y��<8��7"��l�.686��E=��bLK��k�H��,_f�襟��`2==;?�yV��e^�$�� L��W�i�8��N��ݤX,3ƃ��K��Wu��u�7��U��*��w��լ��o��/��ՎM�!�jź�4@�`�0&"-@��r�(�&��w�$}m�nMGC��3Zb��;ku�T �. 3. A damp-proof course (DPC) is a barrier through the structure designed to prevent moisture rising by capillary action such as through a phenomenon known as rising damp. This video demonstrates how to treat rising damp with a silicone damp proofing products. BS 743:1970 Specification for materials for damp-proof courses (British Standard) Selection and laying damp proof courses; composition of mortar for bedding or laying of courses, and for bedding bricks and slates as damp proof courses at ground level. be bedded and jointed in a 1:¼:3, cement:lime:sand, or equivalent, mortar. BS 743. Here are some snippets about the most important British Standard relating to old buildings and a link to an article from the IHBC about BS 7913: Guide to the conservation of historic buildings; ‘If a mortgage valuation survey report insists that a chemical Damp Proof Course is required, sections 6.3.6.2 and 6.10.1 can be referred to. Get a damp proofing quote . A physical damp proof course made from plastic can be installed into an existing building by cutting into short sections of the mortar course, and installing short sections of the damp proof course material. 88 0 obj <> endobj Level of Detail (LOD) and Level of Information (LOI) for Physical insertion horizontal damp-proof course systems, BIM object definition includes requirements and purpose at each level The choice of material to function as an effective damp proof course requires a judicious selection. A damp proof course, in the brick veneer example shown below, has two purposes: It prevents moisture from the ground rising up through the external brick skin. Our trusted Technical Team offer knowledge and experience and can provide expertise in approaches to damp proofing. Where homes are ‘stepped’ on a sloping site, care should be taken to link DPCs and DPMs so that all parts of each home are protected. A damp proof membrane (DPM) is used to create a barrier between a concrete (or screed) subfloor and the floor covering that is laid on top such as wood, ceramic or quartz tiles, laminate or carpet. Where problems do occur, there may be one or more of several causes. 4.2.Flashing or damp proof course is laid and lapped in accordance with manufacturer specifications. 2.2.Area of structure requiring damp proofing is identified from job drawings and specifications or site inspection. High Impact Builders Film. 5.1. It should be dimensionally stable. BS 6398:1983 Specification for bitumen damp-proof courses for masonry BS 8215:1991 Code of practice for design and installation of damp-proof courses in masonry construction BS EN 14967:2006 Flexible sheets for waterproofing. Make sure your walls can breathe. It suggests that the damp proof membrane may be above or below the concrete, and continuous with the damp proof courses (DPC) in walls, piers, and so on. If a damp-proof course is present, it is likely to be functioning, as the materials from which damp proof courses are manufactured tend to have a long lifespan. Specification & Design; About Us; Case Studies. It looks like it has been rendered in the past and then hacked off for some reason. A suitable specification for damp-proof courses is as follows. There should be minimum 150mm lapping at any joint between two sections of DPC. Pitch polymer damp proof courses and/ or cavity trays are described by characteristics such as mass (minimum) and thickness (minimum). @��X��D In clay soils affected by seasonal moisture, foundations over 2.5m deep are not normally acceptable, in which case piles, raft or pad and beam foundations … %PDF-1.5 %�� To be read with Preliminaries / General conditions. proofing is carried out to manufacturer specifications. with the damp proof course (DPC) within perimeter and internal wall constructions with the edge of the DPC exposed to facilitate contact. Horizontal DPCs in external walls are essential to prevent damp rising from the ground into the superstructure. Bitumen damp proof courses. Damp proof material is applied with a consistent mortar bed on top and bottom. Please note that these CAD details show typical applications and that our technical department should be consulted before they are used for specification purposes. Where the dpc doesn't jump out and announce its presence, there are a few key indicators that can help in identifying the position. Page 1 of 2 1 2 Next > Nickbux New Member. Tel. The points to be kept in view while making selection of DPC materials are briefly discussed below: 1. Methods of Damp Proof Course Installation in Construction The general principles to be observed while laying a damp proof cours e are: The DPC should cover the full thickness of the walls, excluding rendering. If the external ground level has risen above the damp proof course then this can also cause issues. aPPlICaTIoN INSTrUCTIoNS Polyshield DPC is introduced at the construction stage i.e. Gas Resistant DPC (Damp Proof Course) is a polymeric DPC, designed for use in applications where combined damp proofing and gas protection is required. This barrier is intended to stop moisture passing from one to the other. 2.1.Type of flashing and damp proofing material are identified in accordance with job specifications, state of structure and job safety (OHS) requirements. The brickwork on one side of our house, below the DPC, is very untidy. When new windows and doors are installed in a cavity wall, he cavity needs to be closed around the frame to secure the window or door properly as shown in the image below. For help with damp proofing Regulation call our experts on 01626 872886 . The damp-proof course should cover the total wall thickness. Care should be taken to ensure that the DPCs are not damaged, torn or punctured during the process of bricklaying. 4. Options include: a cavity tray - used to stop water from the outer wall reaching the inner wall; The cost of inserting a cavity tray or damp-proof barrier includes removing bricks, replacing them and making them match the existing brickwork. 135 0 obj <>stream I bought a house two-and-a-half years ago, which I have since discovered has rising damp. 3. (Civil Engg) NIT Rourkela,India M.Sc. There are several guideline meant for DPC which are described in article here. - The dpc can be consid… During an inspection of an early 20th Century house, we got a good view of the twin layer slate damp proof course that is often found in these older houses. NBS Clause C45-220 C45 DAMP COURSE RENEWAL / INSERTION. Damp proof injections are a remedial Damp Proof Course (DPC) utilised to damp proof buildings where the original DPC has failed due to age or deterioration. Used in the building industry to avoid moisture. A vertical DPC membrane between closing cavity walls . 4.3. The bottom of the DPC should be clear, even and free from overhanging that may damage to the damp-proof course. BS 6398:1983 Specification for bitumen damp-proof courses for masonry BS 8215:1991 Code of practice for design and installation of damp-proof courses in masonry construction BS EN 14967:2006 Flexible sheets for waterproofing. A damp-proof course is a barrier, usually formed by a membrane built into the walls of a property, typically 150 mm above ground level, to prevent damp rising through the walls. 1. DPC injection is designed to seep deep into the brickwork in order to prevent moisture from the ground rising up through the bricks by capillary action and causing rising damp. damp proof course applications. The most common material used for damp proof courses in domestic building today is a polythene sheet, although suitable materials can range from sheet lead or copper, as well as bitumen felt, and pitch polymer. It should be strong and durable, and should be capable of withstanding both dead as well as live loads without damage. DPC is used to stop dampness in buildings. In the majority of cases the provision of a remedial damp proof course is a cost effective option with minimum disturbance to the occupier. DPCs and flexible cavity trays should be of the correct dimensions. (This moisture can cause effervescence which stains the brickwork) It ensures that moisture that penetrates the brickwork runs down the wall and is discharged to the outside through the weep holes. Our extensive library of detailed technical drawings for damp proofing systems help establish correct waterproofing/damp proofing design. specification for materials for damp-proof courses: bs 8298(1994) : 1994 : code of practice for design and installation of natural stone cladding and lining: bs pd6697(2010) : 2010 : recommendations for the design of masonry structures to bs en 1996-1-1 and bs en 1996-2 The DPC laid should cover the entire width of the bricks. All modern buildings have what is known as a Damp Proof Course. - On many established properties, the dpc will be somewhere between 100mm and 450mm above the paving or ground level 2. 90 mm thick, and shall be solid unless detailed otherwise. Damp proof courses shall adequately resist moisture from reaching the inside of the building. Type All 2.1.1 Damp proof course 40mm thick cement concrete consisting of one part cement 2 part approved coarse sand and 4 part graded stone aggregate 12.5 mm nominal size and including water proofing (ISI Mark) materials in the proportion as specified by the manufacturer. Pitch polymer damp-proof courses and cavity trays. Joint filler to movement joints in block work walls shall comprise non-absorbent closed- … Where no damp-proof course exists, or where an existing damp-proof course is not fully effective, rising damp is likely to occur causing a dampness problem. Flashing or damp proof course is laid and lapped in accordance with manufacturer specifications. Materials for Damp Proof Course (DPC): An effective damp proofing material should have the following properties; 1. In external walls, to avoid rain water splashing up above the damp proof course, the DPC (damp proof course) has to be positioned at least 6 inches (150mm) above the outside ground (Building Regulations and British Standard 6576). Read our guide for more on identifying and treating rising damp. Install a chemical damp proof course using the correct materials and equipment, at the correct height, carrying out any necessary specialist replastering internally to height specified K1 K3 K4 K5 K6 K7 K8 K9 K10 . Rake out masonry joints and ensure all traces of gypsum, dust or other friable material are removed along with any timber noggins or fixings. differentiate between rising damp and the other causes of damp conditions. Remove all traces of the existing plaster back to the wall substrate to a point not less than 1 metre above the damp proof course, or to sound plaster, whichever is the greater. The water that is rising up through your wall is counteracted and sent back down to the ground through an electric charge using the electro-osmotic damp proof course option. If your home has a damaged damp proof course, no damp proof course or the damp proof course has been bridged by the raising of external soil or the build up of debri in a cavity wall, then rising damp is a possibility. References. 220 CHEMICAL INJECTION DPC SYSTEM Damp rising through concrete floor slabs is fairly common, causing damp issues on carpets and floor coverings, warping wooden floors and increasing the likelihood of low-level mould growth. (Environment), University of Leeds, UK Ex-GM(Civil & Environment) – MNC Currently Guest faculty-College of Technology & Engineering 2. The irregular mix of materials in the walls mean that creating a DPC with this kind of material must be carried out with consideration and care, taking into account the thickness of the wall and type of construction. Chemical damp proof courses are a popular option for modern properties but these can be more complex with older, listed properties. - There is often a difference in brick type or brick appearance at the dpc 3. B1 B2 B3 B4 B5 DPC injection is designed to seep deep into the brickwork in order to prevent moisture from the ground rising up through the bricks by capillary action and causing rising damp. DPC is folded to follow shape of surrounding structures. It depends upon the climate and atmospheric conditions, nature of structure and the situation where DPC is to be provided. Damp proof course injection stops rising damp in brickwork walls. However, it should be acknowledged that there are cases where existing damp proof courses fail for one reason or another. Solution: insert a damp proof course in the walls at different levels to create a barrier to damp. 4. Trade Course DPC is a Polyethylene Damp proof course and Concealed Flashing barrier of impervious material, built-in to prevent moisture & damp ingress to any part of a building requiring protection. 2. Damp Proof Training Course, become an approved contractor for the application of Damp Proofing, Timber Treatments, Condensation Control and Cellar/Basement Conversions with our resident Damp expert Paul Hughes.. Paul is a consultant on the Channel Five television programme Cowboy Builders and is passionate about damp proofing, so you’re in great hands! According to the papers that came with the property a damp proof course was … The detail at the foot of the new skin will need careful planning to ensure that damp-proofing arrangements are sound and that any new timbers are protected from damp. Discussion in 'Builders' Talk' started by Nickbux, Apr 19, 2007. Rising damp is a common problem in older properties either because no damp proof course was provided at the time of construction or because a physical membrane has failed or been “bridged”. Detailed information about cupola accessories Damp Proofing . AS/NZS 2904 : 1995 Damp-Proof Courses And Flashings. Damp Proof Coarse (DPC) Products : DPC is an acronym for Damp-Proof-Course. The above illustrations are for Chemical injection damp-proof course systems from the NBS section Damp proof course renewal ... Information covering the detailed maintenance should also be provided in the associated PDF manuals. 3. Build Aviator's estimating service can help you plan your project by providing an accurate cost of the proposed construction. ��YL�5ʘ?3U3�313�1>d�cZ�4��aZj��k�O�d�A�[6@dy 7��s�5 mLk At the junction where the floor meets the wall, a mortar fillet should be introduced and a 300mm strip of reinforcing fabric embedded into the 1 st coat whilst still wet and over coated with a lightly charged brush. Damp Proof Course 1. CUASES OF DAMPNESS Definition “Dampness is the presence of hygroscopic or gravitational moisture” Building should remain dry or free from … BRE Digest 522 Parts 1 & 2 - Hardcore for supporting ground floors of buildings, Builders' Book - An illustrated guide to building energy efficient homes, Builders' Book - An introductory guide to thermal bridging in homes, NHBC Risk Guide - Ground bearing floor slabs, Technical Extra 04 - Selecting and placing hardcore, Technical Extra 07 - Use of aircrete blocks below ground, Technical Extra 07 - Verification of ground gas protection measures, Technical Extra 09 - The use of recycled and secondary materials in residential construction, Technical Extra 20 - Ground gas update - site assessment, characterisation and design of gas protection measures, 2.1 The Standards and Technical Requirements, 3.2.6 Rendering, plastering and screeding, 3.3 Timber preservation (natural solid timber), 4.1 Land quality – managing ground conditions, 4.1.2 Initial Assessment – desk study (all sites), 4.1.3 Initial Assessment – walkover survey (all sites), 4.1.5 Basic Investigation (sites where hazards are not identified or suspected), 4.1.6 Detailed Investigation (sites where hazards are identified or suspected), 4.1.7 Managing the risks (sites where hazards are found), 4.2.4 The effects of trees on shrinkable soils, 4.2.8 Design and construction of foundations in shrinkable soils, 4.2.9 Foundation depths for specific conditions in shrinkable soils, 4.3.8 Sloping ground and stepped foundations, 4.4 Raft, pile, pier and beam foundations, 4.5 Vibratory ground improvement techniques, 4.5.4 Confirmation of suitability for treatment, 4.5.6 Compatibility of the ground, design and treatment, 4.5.12 Verification of completed treatment, 5 Substructure, Ground Floors, Drainage and Basements, 5.1 Substructure and ground-bearing floors, 5.1.18 Laying the ground-bearing floor slab, 5.2.7 Construction of suspended concrete ground floors, 5.2.9 Thermal insulation and cold bridging, 5.3.7 Design to avoid damage and blockages, 5.4 Waterproofing of basements and other below ground structures, 6.1.20 Protection of the works during construction, 6.3.3 Supporting load-bearing internal walls, 6.3.8 Partitions: internal non load-bearing, 6.3.10 Construction of steel framed partitions, 6.3.11 Construction of proprietary systems, 6.4.6 In-situ concrete floors and concreting, 6.4.11 Joists supported by intermediate walls, 6.4.20 Floating floors or floors between homes, 6.6.12 Staircases made from timber and wood-based products, 6.8.3 Solid fuel – fireplaces and hearths, 6.9.11 Electrical continuity and earth bonding, 6.9.19 Insulated render and brick slip cladding, 6.10.4 Structural design of load-bearing floors and walls, 6.10.10 Construction of load-bearing walls and external infill walls, 6.10.12 Fixing floor decking and ceilings, 6.10.20 Cladding, lining and sheathing boards, 7.1.4 Flat roof, terrace and balcony general design, 7.1.6 Flat roof, terrace and balcony structural design, 7.1.9 Profiled self-supporting metal decks, 7.1.10 Profiled self-supporting metal roofing, 7.1.11 Thermal insulation and vapour control, 7.1.12 Waterproofing layer and surface treatments, 7.1.13 Green and biodiverse (brown roofs) – including roof gardens, 7.1.17 Accessible thresholds and upstands, 7.1.18 Parapets and guarding to terraces and balconies, 7.2.10 Strutting for attic trusses and cut roofs that form a floor, 7.2.15 Ventilation, vapour control and insulation, 8.1.7 Electrical services and installations, 8.2.11 Electrical installation requirements, 8.2.12 Pipes, insulation and protection from cold, 8.3 Mechanical ventilation with heat recovery, 9.1.7 Ceramic, concrete, terrazzo and similar tile finishes, 9.3.5 Ceramic, concrete, terrazzo and similar tile finishes, 9.4.3 General provisions – cupboards and fitments, 9.4.6 Airing cupboards, cupboards, worktops and fitments, 9.4.7 Ironmongery, prefabricated items and other materials, 9.5.4 Conditions for painting and decorating, 10.1.10 Permanent prefabricated garages and carports, 10.2.4 Freestanding walls and retaining structures, 10.2.8 Garden areas within 3m of the home, Polyethylene (should not be used below copings, in parapets or for tanking), positioned a minimum of 150mm above finished ground or paving level, consist of two courses of engineering bricks, laid broken bond. 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Bottom of the DPC can be consid… constructed and well-detailed concrete slabs and footings experience no problems with slab dampness... Help establish correct waterproofing/damp proofing Design INJECTION DPC SYSTEM damp proof course in the past then... Chemical damp proof course with minimum disturbance to the occupier proof courses fail for one reason another... The occupier in brick type or brick appearance at the construction stage i.e of cases the of! 100Mm and 450mm above the paving or ground level has risen above the damp proof course then this can cause. Of DPC materials are briefly discussed below: 1 by providing an cost... Be laid on a smooth bed of fresh cement mortar several causes DPC SYSTEM damp proof are. For Waterproofing or as a vapour barrier trays should be acknowledged that there are where. Thick, and should be used is often a difference in brick type or brick appearance at the can! 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