The attached document covers the three types of protection outlined in bs 8102, plus some practical notes for our market. 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. What is bs 8102 and how does it affect basement waterproofing. This is a full revision of the standard, and includes the following changes.
Cavity drain membrane systems aquarend group 01708 222786. 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. 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. The bca waterproofing design guide has been updated and now published by tbic, to provide general guidance to bs8102. Cavity drain membrane systems aquarend group 01708. Can a grade 3 basement be achieved with one system.
Bs 8102 code of practice for protection of below ground. Basement grades are stipulated in the british standard bs 8102. Although other documents are available, bs 8102 is the document that you should be familiar with. Implications of bs8102 for newbuild basements in deciding the method for waterproofing a newbuild basement it is. 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. Most basements will be for domestic accommodation, which is grade 3. 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. Also because water table levels change, drains block and localised.
However, this grade has not been retained as its only difference from grade 3 is the performance level related to. Home publication index british standards institution bs 8102. Basement grades are stipulated in the british standard, bs 8102. What follows is an in depth account of all of the factors involving water when designing a below ground structure. 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.
Basement waterproofing system selection advice for your. 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. A well designed basement waterproofing system thats been correctly installed will provide years of good performance if adequately maintained. For a type c cavity drainage system to meet bs 8102, the system must be accessible for servicing and maintenance. 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. 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 car park and habitable areas of the basement were designed for bs 8102.
Guidance with respect to ventilation may be found in references 6 and 8. 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. Basement waterproofing grades wise basement systems. 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. 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. 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. 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. Grade 1 is suitable for more industrial areas for example plant. Basement waterproofing covering all bases flexcrete. Bs 8102 gives four grades of basement use, together with acceptable forms of construction. We have attempted to summarise the british standard to be applicable for the melbourne market. Make sure whatever materials you use comply fully with bs8102 and with grade 3 construction where grade 3 refers to. 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.
Basement waterproofing regulations guide that explores all you need to know about complying with the bs8102 guidelines when. Table 1 of bs 8102 relates environmental performance levels to basement usage, and defines them in grades 1 to 4. Waterproofing grades expert insight into bs8102 wise basement. Many people in the waterproofing industry refer to the british standard bs 8102.
The basement waterproofing protection system will be selected to create grade 1, 2 or 3 environments as required in terms of its performance. Types of waterproofing there are three main methods of providing protection against ground water for residential basements. How to select the most appropriate basement waterproofing system for your structure in accordance with bs 8102. 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. Table 2 sets out the grades of waterproofing these revised definitions are set out below. These grades and types are intended to make a clear distinction. Load bearing steel intensive basement pressin method and thorough inspection technique case study. 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. The certificate states grade 3 performance as 200 mnsg1 and grade 4 as 550 mnsg1.
Archives, landmark buildings, and stores requiring a controlled environment. A february 2014 telegraph article reckoned that, on standard four bedroom period homes, basement conversions can increase value by around 15 per cent. The different areas required different standards of waterproofing in line with bs 8102. These are defined in bs 8102 as type a barrier system, type b structurally integral system and type c drained system. Grade of basement, usage, performance level, performance level. Bs8102 waterproofing structural waterproofing for everyone. The methods can be selected as type a, b or c, or as a combined system. Basements waterproofing general guidance to bs 8102 2009. Waterproofing a basement how to comply with bs8102. Bs 8102 table 2 gives guidance as to the performance required from structural waterproofing. British standard bs 8102 2009 ink technical services ltd. 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. Download the nhbc guide to basements and waterproofing. Establish the form of construction type a, b or c from bs 8102.
These specific grades relate to the usage of the basement itself and provide requirements regarding each specific level or grade. Internal environment grade 1 car parking and plant rooms excluding electrical equipment and workshops some seepage. Listed below are some examples showing simple cost effective solutions to meet the four grades of performance listed in bs 8102. This classification of standards sees waterproofing. 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. Bs8102 basement waterproofing regulations how to comply.
Basement information centre the bca waterproofing design guide has been updated and now published by tbic, to provide general guidance to bs8102. Most of them wont be relevant to your particular situation and. 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. Waterproofing 2 basement usage table 1 relates environmental performance levels to basement usage, and defines them from grades 1 to 3. As a code of practice the british standard is the primary waterproofing design guide which we and virtually all others refer to, where considering. 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. The first thing to understand is that these grades are defined within british standard 8102 2009 code of practice for protection of below ground. 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. Grades 3 and 2 are suitable for habitable areas such as office and domestic uses. The best way to achieve this is by providing access to perimeter drainage channels. 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.
Establish the usage of the basement from the client, and establish the performance level required from table 1 of 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. However, since usage may change, it is better to construct a basement to a grade 3 environment than to upgrade it later. Bs 8102 is the british standards institute code of practice for protection of below ground structures against water from the ground. Basement construction comprises a concrete slab and walls of reinforced concrete or blockwork with external, sandwiched or internal. Bs 81021 gives guidance on the construction of new basements, introducing three performance grades. Case studies of remedial waterproofing and repair of. Some basements may be for permanent workshops or garages, and a grade 2 environment would be acceptable. 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.
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. Although not uk law, failure to use bs 8102 could result in the designer. Table 1 bs 8102 grades of waterproofing protection grade example of use of structure performance level 1 car parking. 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. The certificate states grade 3 performance as 200 mnsg1 and grade 4 as 550.
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