�����YL�5ʘ?3U3�313�1>d�cZ�4���aZj��k�O�d�A�[6@dy 7�����s�5 mLk 4.4.DPC is folded to follow shape of surrounding structures. - On many established properties, the dpc will be somewhere between 100mm and 450mm above the paving or ground level 2. Damp Proof Course. 5.1. 3. Gas Resistant DPC (Damp Proof Course) is a polymeric DPC, designed for use in applications where combined damp proofing and gas protection is required. However, it should be acknowledged that there are cases where existing damp proof courses fail for one reason or another. 4.1.Damp proof is installed in accordance with work drawings and manufacturer specification. Definitions and characteristics The choice of material to function as an effective damp proof course requires a judicious selection. For help with damp proofing Regulation call our experts on 01626 872886 . Vertical damp proof courses are usually installed around windows or doors when they are being installed in a cavity wall. h��W�n�F����� ��%���d[��$l�. 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. 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. 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”. Delta Membrane Systems Limited has a dedicated team of Waterproofing Design Specialists. Discussion in 'Builders' Talk' started by Nickbux, Apr 19, 2007. Damp proof courses shall adequately resist moisture from reaching the inside of the building. It should be impervious. 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. 4.3. To be read with Preliminaries / General conditions. 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. The DPC is robust and flexible, performing well under high compressive loads. 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. The main purpose of DPC waterproofing membrane is to prevent rising damp from entering load bearing walls that may cause weakening of structures, cracks in plaster and blistering of plaster or paint finishes on walls. What types of barrier can be used? Bitumen damp proof courses. There is a code of practise that all damp proofing contractors should abide by which is the BS: 6576 – 2005 “Diagnosis of rising damp in walls of buildings and installation of chemical damp-proof courses” This is a British standard that states the approved chemical damp proof courses that should be used in the UK for the control of rising damp. NBS Clause C45-220 C45 DAMP COURSE RENEWAL / INSERTION. Specification for Materials for damp-proof courses 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. 5. 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 DPC is folded to follow shape of surrounding structures. All modern buildings have what is known as a Damp Proof Course. According to the papers that came with the property a damp proof course was … Our extensive library of detailed technical drawings for damp proofing systems help establish correct waterproofing/damp proofing design. 3. Care should be taken to ensure that the DPCs are not damaged, torn or punctured during the process of bricklaying. Build Aviator's estimating service can help you plan your project by providing an accurate cost of the proposed construction. For convenience the CAD drawings are divided into the following categories: Damp-proofing above ground / Radon protection; Externally-applied basement waterproofing 5. Materials for Damp Proof Course (DPC): An effective damp proofing material should have the following properties; 1. Rising damp is the effect of water rising from the ground into property. It should be dimensionally stable. A vertical DPC membrane between closing cavity walls . damp proof course applications. Rising damp, and some penetrating damp, can be caused by faults to, or the absence of a damp-proof course (DPC) or damp-proof membrane (DPM). Where problems do occur, there may be one or more of several causes. DPCs and flexible cavity trays should be of the correct dimensions. Issues to be taken into account include: positioning of DPCs Joint filler to movement joints in block work walls shall comprise non-absorbent closed- … Flashing or damp proof course is laid and lapped in accordance with manufacturer specifications. 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. Tel. aPPlICaTIoN INSTrUCTIoNS Polyshield DPC is introduced at the construction stage i.e. Damp Proof Course 1. with the damp proof course (DPC) within perimeter and internal wall constructions with the edge of the DPC exposed to facilitate contact. 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. 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. h�b``d``�a```�d€ Dampness in building or house may cause most of the damage to the components of the building or house. This barrier is intended to stop moisture passing from one to the other. In the majority of cases the provision of a remedial damp proof course is a cost effective option with minimum disturbance to the occupier. Features. 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. It can be quite confusing to know what internal damp proofing methods and products to use and when, as well as what combination of treatments will ensure your house stays damp-free. constructed and well-detailed concrete slabs and footings experience no problems with slab edge dampness. Damp-proof courses and flashings - Methods of test, Part 0: General introduction, list of methods and test specimen requirements AS/NZS 4347.0:1995 Rec:2014 AS/NZS 4347.0-1995 As previusly mentioned, a damp proof course can be achieved using various methods and treatment options including the following: 1. Felt for damp-proof courses shall be bituminous 3-ply felt to BS 743, Type A. 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. S1 S2 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 . 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. 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 . The points to be kept in view while making selection of DPC materials are briefly discussed below: 1. There are several guideline meant for DPC which are described in article here. Available in 25m or 50m lengths at 4m widths. 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. BS 743. during the erection of the brickwork, block work or masonry walls using traditional building construction methods.The damp proof membrane must extend through the full wall thickness and it should be laid on an even bed of mortar. Unless stated otherwise, damp-proof-courses shall be: Placed under walls to provide a continuous damp-proof barrier around the building Solution: insert a damp proof course in the walls at different levels to create a barrier to damp. Where the dpc doesn't jump out and announce its presence, there are a few key indicators that can help in identifying the position. Bitumen damp proof courses. Rake out masonry joints and ensure all traces of gypsum, dust or other friable material are removed along with any timber noggins or fixings. �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 �. 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. 4.1.Damp proof is installed in accordance with work drawings and manufacturer specification. Premium Orange – Perfect for waterproofing or as a vapour barrier. Please note that these CAD details show typical applications and that our technical department should be consulted before they are used for specification purposes. A suitable specification for damp-proof courses is as follows. Cupola accessories. There should be minimum 150mm lapping at any joint between two sections of DPC. Damp proof course or DPC is a major process in construction. If the ground could contain water soluble sulphates, or there is any risk that sulphate or other deleterious matter could contaminate the hardcore, the membrane should be placed at the base of the concrete slab. It should be strong and durable, and should be capable of withstanding both dead as well as live loads without damage. The brickwork on one side of our house, below the DPC, is very untidy. 4. 0 88 0 obj <> endobj 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. Slate Damp Proof Course on Early 20th Century House. 4.2.Flashing or damp proof course is laid and lapped in accordance with manufacturer specifications. If it’s not, see if you can lower the floor level outside yourself. I bought a house two-and-a-half years ago, which I have since discovered has rising damp. References. - The dpc can be consid… Where hollow block work is specified for work above damp-proof course level, the blocks shall have two voids running vertically; the minimum thickness of outside skin shall be 30 mm and of diaphragms 25 mm; the maximum longitudinal dimension of any one void shall be 150 mm. In South Australia, additional requirements apply. Damp proof material is applied with a consistent mortar bed on top and bottom. 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. endstream endobj startxref Experience no problems with slab edge dampness … 3 popular option for modern properties but these can be more with! 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