Bs 8102 was updated in 2009 from a previous version written in 1990, to reflect the increase in deep urban constructions and residential basement conversions. Bs 8102 code of practice for protection of below ground. For a type c cavity drainage system to meet bs 8102, the system must be accessible for servicing and maintenance. Waterproofing a basement how to comply with bs8102. Home publication index british standards institution bs 8102. A well designed basement waterproofing system thats been correctly installed will provide years of good performance if adequately maintained. The first thing to understand is that these grades are defined within british standard 8102 2009 code of practice for protection of below ground. Cavity drain membrane systems aquarend group 01708. Although not uk law, failure to use bs 8102 could result in the designer.
What follows is an in depth account of all of the factors involving water when designing a below ground structure. However, this grade has not been retained as its only difference from grade 3 is the performance level related to. Environmental grades 1 to 3 are used to define levels of dryness, within a given basement or cellar, with a grade 1 environment essentially being more wet, than a grade 3 environment. These grades and types are intended to make a clear distinction between the types of basement waterproofing systems available and the sort of results that can be expected.
The bca waterproofing design guide has been updated and now published by tbic, to provide general guidance to bs8102. Internal environment grade 1 car parking and plant rooms excluding electrical equipment and workshops some seepage. The car park and habitable areas of the basement were designed for bs 8102. British standard bs 8102 2009 ink technical services ltd. The first thing to understand is that these grades are defined within british standard 8102 2009 code of practice for protection of below ground structures against water from the ground. Bs8102 basement waterproofing regulations how to comply. Implications of bs8102 for newbuild basements in deciding the method for waterproofing a newbuild basement it is. Grade 1 grade 2 3 grade 4 all of the 4 grades of use can be created by incorporating a selection of sika products for types a, b or c form of construction as described in b. These specific grades relate to the usage of the basement itself and provide requirements regarding each specific level or grade. Grades 3 and 2 are suitable for habitable areas such as office and domestic uses. How to select the most appropriate basement waterproofing system for your structure in accordance with bs 8102. Certified by the british board of agrement bba, sika1 meets the requirements of bs 8102 grades two, three and four, with grade 3 used to seal the hugo boss store. The new revision of bs 8102 and how it may affect your waterproofing design the code is not specific about what the qualifications of the waterproofing specialist, which is why the property care association with the approval of the bs 8102 committee, as well as the basement information centre is. The new revision of bs 8102 and how it may affect your waterproofing design the code is not specific about what the qualifications of the waterproofing specialist, which is why the property care association with the approval of the bs 8102 committee, as well as the basement information centre is putting together a.
What is bs 8102 and how does it affect basement waterproofing. Cavity drain membrane systems aquarend group 01708 222786. Bs 8102 is a design document whose purpose is to inform the designer of the various methods of waterproofing available and to assist in the correct specification of those systems. Download the nhbc guide to basements and waterproofing. Basement grades are stipulated in the british standard bs 8102.
Many people in the waterproofing industry refer to the british standard bs 8102. Guidance with respect to ventilation may be found in references 6 and 8. Most basements will be for domestic accommodation, which is grade 3. Ensure proposals comply with the requirements of bs 8102. Nbs chorus intelligent construction specification, in the cloud features and pricing a range of subscription options to make nbs chorus work for you book a demonstration sign in to nbs chorus other tools nbs offers a range of tools for specification and collaboration national bim library the most trusted bim library in the uk, certified to the internationallyrecognised nbs bim object standard. Bs 8102 table 2 gives guidance as to the performance required from structural waterproofing.
Load bearing steel intensive basement pressin method and thorough inspection technique case study. Most of them wont be relevant to your particular situation and. This classification of standards sees waterproofing. These grades and types are intended to make a clear distinction between the types of basement waterproofing systems available and the sort of results that can be expected when each is applied. A february 2014 telegraph article reckoned that, on standard four bedroom period homes, basement conversions can increase value by around 15 per cent. Bs 81021 gives guidance on the construction of new basements, introducing three performance grades.
The methods can be selected as type a, b or c, or as a combined system. Basement waterproofing regulations guide that explores all you need to know about complying with the bs8102 guidelines when. These grades and types are intended to make a clear distinction. These are defined in bs 8102 as type a barrier system, type b structurally integral system and type c drained system. Table 1 of bs 8102 relates environmental performance levels to basement usage, and defines them in grades 1 to 4. Nov 02, 2015 bs 8102 is british standard code of practice, advising designers on how to specify basement waterproofing systems to achieve outcomes of various levels contractors are not legally bound by british standards such as bs 8102 but, should there be a failure in the system due to shortcomings in the design, this is the code of practice.
Waterproofing 2 basement usage table 1 relates environmental performance levels to basement usage, and defines them from grades 1 to 3. The basement waterproofing protection system will be selected to create grade 1, 2 or 3 environments as required in terms of its performance. Sep 16, 2015 a february 2014 telegraph article reckoned that, on standard four bedroom period homes, basement conversions can increase value by around 15 per cent. Can a grade 3 basement be achieved with one system. Alongside the waterproofing requirements specified for basement types, grading is another way in which basements can be defined under the bs 8102, as of 2009. The best way to achieve this is by providing access to perimeter drainage channels. Bs8102 waterproofing structural waterproofing for everyone. Table 1 bs 8102 grades of waterproofing protection grade example of use of structure performance level 1 car parking. Bs 8102 does not give recommendations on the use of embedded heating in structures, floors and walls or for the special requirements in connection with the design and construction of cold stores. The certificate states grade 3 performance as 200 mnsg1 and grade 4 as 550 mnsg1.
Bs 8102 is the british standards institute code of practice for protection of below ground structures against water from the ground. Archives, landmark buildings, and stores requiring a controlled environment. Basement waterproofing grades wise basement systems. Case studies of remedial waterproofing and repair of. Types of waterproofing there are three main methods of providing protection against ground water for residential basements. Bs 8102 implies it does not actually say so that in order to achieve a grade 3 or grade 4 environment, a waterproofing system that will stop. Basement grades are stipulated in the british standard, bs 8102. With an understanding of the basement waterproof systems and how they can work together as well as an awareness of potential defects and how to plan for worst case scenarios, you are able to design a basement to meet your clients needs, guarantee dryness and be fully compliant with bs8102. British standard bs 8102 2009 ink technical services.
Bs 8102 gives four grades of basement use, together with acceptable forms of construction. Basement information centre the bca waterproofing design guide has been updated and now published by tbic, to provide general guidance to bs8102. Waterproofing grades expert insight into bs8102 wise basement. Although other documents are available, bs 8102 is the document that you should be familiar with. Make sure whatever materials you use comply fully with bs8102 and with grade 3 construction where grade 3 refers to. However, since usage may change, it is better to construct a basement to a grade 3 environment than to upgrade it later. This defines the grades in general terms, but gives no testing or performance criteria, however it is relatively clear as to how each grade is defined. As a code of practice the british standard is the primary waterproofing design guide which we and virtually all others refer to, where considering. Basement waterproofing covering all bases flexcrete. Nhbc requires basements which are to be used for habitable accommodation to be constructed to grade 3, and those used for parking cars to be constructed to grade 2. Use of different protection types based on water table classification risk associated with water table water table classification see note waterproofing protection type a type b type c piled wall reinforced concrete wall to bs en 1992 low high low acceptable acceptable acceptable acceptable.
Grade 1 is suitable for more industrial areas for example plant. Establish the usage of the basement from the client, and establish the performance level required from table 1 of bs 8102. The attached document covers the three types of protection outlined in bs 8102, plus some practical notes for our market. The different areas required different standards of waterproofing in line with bs 8102. With work now complete, the new hugo boss flagship store can open its doors safe in the knowledge that its new basement level is protected by sika1, guaranteeing water. Bs8102 gives recommendations and provides guidance on methods of dealing with and preventing the entry of water from surrounding ground into a structure below ground level. Listed below are some examples showing simple cost effective solutions to meet the four grades of performance listed in bs 8102. Basement construction comprises a concrete slab and walls of reinforced concrete or blockwork with external, sandwiched or internal.
Basements waterproofing general guidance to bs 8102 2009. Bs 8102 makes reference to the use of subsoil drainage and wherever possible the reduction or removal of hydrostatic pressure by the appropriate installation of land drains andor drainage membranes. Bs 8102 implies it does not actually say so that in order to achieve a grade 3 or grade 4 environment, a waterproofing system that will stop water vapour as well as liquid water must be used. Also because water table levels change, drains block and localised. However, if that work isnt carried out properly, the repercussions can be ruinous for homeowners and contractors, one or other of whom must shoulder the costs for remedial measures.
Establish the form of construction type a, b or c from bs 8102. We have attempted to summarise the british standard to be applicable for the melbourne market. As outlined within british standard bs 8102, there are four grades of basement dryness. Basic utility for car parks, plant roomsnonelectrical minor seepage or damp patches tolerable reinforced concrete walls and floors in accordance with bs 8110 with construction joints effectively keyed by. Basement waterproofing system selection advice for your. Bs 8102 is british standard code of practice, advising designers on how to specify basement waterproofing systems to achieve outcomes of various levels contractors are not legally bound by british standards such as bs 8102 but, should there be a failure in the system due to shortcomings in the design, this is the code of practice. Table 2 sets out the grades of waterproofing these revised definitions are set out below. The certificate states grade 3 performance as 200 mnsg1 and grade 4 as 550. In addition, consideration has to be made for the repair of the waterproofing system if failure were to occur and the consequential loss and the legal disputes resulting from the failure.