ASBESTOS SURVEY OF REDSANDS CHILDREN S CENTRE CREWE ROAD WILLASTON NANTWICH CW5 6NE JUNE 2004

Transcription

1 ASBESTOS SURVEY OF REDSANDS CHILDREN S CENTRE CREWE ROAD WILLASTON NANTWICH CW5 6NE JUNE AEC are UKAS accredited for surveying and hold the Type C UKAS inspection award no Report prepared for : Report reference : Cheshire County Council, Richard House, 80 Lower Bridge Street, Chester. CH1 1SW A7698 Issue date : July 2004 Prepared by : Mr. J. McKeon BSc (Hons) Senior Environmental Consultant Approved by : Miss V Lovatt MSc CCP (Asbestos) Major Projects and Training Manager

2 CONTENTS 1.0 EXECUTIVE SUMMARY INTRODUCTION AEC S BRIEF IN THE PROJECT SURVEY METHODOLOGY LIMITATIONS OF SURVEY A GUIDE TO THE SURVEY RESULTS FINDINGS INACCESSIBLE AREAS RECOMMENDATIONS MANAGEMENT OF ASBESTOS APPENDICES I. ITEM NUMBER LOCATION PLAN Figures 1 3. II. CERTIFICATE OF BULK FIBRE ANALYSIS Pages 1 3. III. BUILDING REGISTER & SUMMARY OF RESULTS Pages 1 5. A of 16 Redsands Children s Centre, Nantwich

3 1.0 EXECUTIVE SUMMARY During the survey, the following installations were identified as containing asbestos: Asbestos floor tiles with asbestos bitumen adhesive underneath in; the store next to the electrical intake cupboard, the electrical intake cupboard, the store next to the general office, the reception area toilet, the ground floor of the Rydal accommodation block & the first floor kitchen in the Telford accommodation block under the linoleum. Asbestos floor tiles in the corridor outside the offices near the Pottery room & the stairs near to the Pottery room. Asbestos stair nosing to the stairs outside the home economics room. Asbestos bitumen adhesive underneath the non-asbestos floor tiles in; the store near to the telephone area in the Education department, in the corridor outside the home economics room, the left & right side toilets next to the forum room, the cleaner s store near to the forum room & the food store near to the bin store. During the survey the following areas were inaccessible: All electrical fuse boxes and distribution boards. Fire doors were not broken into as part of this survey. Inside any live pieces of electrical equipment or machinery such as heater units, cookers, boilers etc. Above the wood slat ceiling in the entrance / waiting area. Below the carpets. Internal aspects of the pipe box work in numerous locations around the Centre. The loft hatch on the first floor in Coniston accommodation block. The music store near to the electrical intake cupboard. Internal aspects of the air-conditioning unit and associated ducting in the general office / enquiries room. Under the pipe insulation in the boiler room. The workshop ceiling. Internal aspects of the fans in the ceiling of the Secure Unit. Above the wood slat ceilings in the Secure Unit. The cistern voids in the Secure Unit. Behind the melamine coated wall panels in the Secure Unit. Under the sinks in the Secure Unit. The roof of the Secure Unit. The roof of the workshop & play room. A of 16 Redsands Children s Centre, Nantwich

4 2.0 INTRODUCTION At the request of Mr. R. Wilde acting on behalf of Cheshire County Council, Airborne Environmental Consultants Ltd have carried out a Type 2 standard sampling survey of Redsands Children s Centre, Nantwich. The aim of the survey is to determine whether any asbestos containing materials are present in the building, and to specify appropriate remedial action. The survey was carried out by Jim McKeon and Paul Ashbrook, and was completed on 2 nd 3 rd June AEC are UKAS accredited for surveying and hold the Type C UKAS inspection award no A of 16 Redsands Children s Centre, Nantwich

5 3.0 AEC s BRIEF IN THE PROJECT AEC have been requested to provide the following services. To provide an experienced asbestos survey team to site to carry out a sample, identification & assessment survey (Type 2). To take representative samples of any materials suspected of containing asbestos and to analyse these in accordance with HSE document MDHS 77 Asbestos in bulk materials. To prepare a detailed written report showing the location, extent and condition of all asbestos installations along with any remedial recommendations necessary. All recommendations shall be made considering the building is to be safely managed. A of 16 Redsands Children s Centre, Nantwich

6 4.0 SURVEY METHODOLOGY The asbestos survey carried out shall be one of three types, as agreed at the time of the order. The three types are: Type 1. Location and assessment survey (presumptive) A visual asbestos survey, giving an assessment of the site by highlighting all suspected asbestos installations present. The survey technique relies on the ability of the surveyor to visually identify asbestos and does not include the taking of samples to confirm the presence of asbestos. Hence the surveyor has presumed the presence of asbestos using his / her experience and knowledge of asbestos in buildings. The benefits of this survey technique are that it is quicker and less expensive than other survey types. The disadvantages are that the accuracy of the survey is heavily dependent on the experience and expertise of the surveyor and that the survey will only highlight areas of probable asbestos. There is significant scope for inaccuracy in such surveys with the possibility of some asbestos-containing materials not being identified and some non-asbestos materials being visually identified as being asbestos. Type 2. Standard sampling, identification and assessment survey (sampling) This type of survey is the most common form of asbestos survey undertaken. This also requires the surveyor to identify any installations on a site that she/he suspects may contain asbestos, as the type 1. However, these installations are then sampled (may require several samples depending on size and complexity of the suspect installation) and analysis carried out at our UKAS accredited laboratory, which allows confirmation of whether the sampled materials definitely contain asbestos or are asbestos free. Visually similar homogenous materials are then referenced to sampled materials, and are strongly presumed to be the same material i.e. contain asbestos or not, as the sampled material. The benefits of this survey technique are that it will give a much more accurate result than the walk through survey by confirming where asbestos is present, and will give additional information on asbestos types / concentrations on which to base an assessment of risk. The disadvantages are that the survey technique will require more time and hence be more expensive. The survey does not include for breaking into voids or inaccessible areas and therefore may miss any asbestos present in such areas and, because only representative samples are taken of suspected asbestos installations, it may be possible that visually similar asbestos and non asbestos materials could be confused. A of 16 Redsands Children s Centre, Nantwich

7 Type 3. Full Access sampling and identification survey (pre-demolition / major refurbishment survey) A full-access intrusive asbestos survey, extending the standard sampling asbestos survey, to include investigations into reasonably accessible sealed voids and the fabric of the building. AEC strongly recommend that this survey type be only carried out in unoccupied buildings, and only prior to demolition or major refurbishment. This survey shall include breaking through partition walls, ceilings etc. to confirm the presence or absence of asbestos and, normally, this is carried out prior to demolition or refurbishment works where significant damage to the building will not be a problem. This will result in damage to stud partition walls, plasterboard ceilings, wood riser covers, doors, computer floors, carpets, kitchens, bathrooms etc. The damage caused by this type of survey is kept to a minimum, but in some cases requires reinstatement, which is not included in the survey unless pre-arranged. A Type 3 survey shall only be carried out if safe to do so. If there are live services inside a building, type 3, access may not be possible to certain areas and may require a further visit in the future. In addition, AEC do not carry out wholesale demolition of areas, such as walls or ceilings for safety reasons. Where access into voids is required, this shall be done via making holes in ceilings etc of a size to allow access for sampling purposes only. Areas above a height of 3metres, or above ladder height may not be accessible without lifting equipment or scaffolding, and provision of lifting equipment shall be agreed at tender stage. This survey type shall result in a more accurate survey, but will again take more time and hence entail a greater cost. In addition, an asbestos register is not included in this type of survey, as it is presumed that all asbestos materials identified are to be removed to facilitate demolition works. The disadvantages include the degree of damage to internal surfaces that could result from the survey and the fact that, again, only representative samples are taken of suspected asbestos installations. There is still a chance that some asbestos containing material may not be identified if they are in sealed voids or highly inaccessible areas. These may only be found at the time of demolition. On this occasion a Type 2 standard sampling survey has been carried out. A of 16 Redsands Children s Centre, Nantwich

8 The survey was carried out in accordance with the HSE document MDHS 100 Surveying, sampling and assessment of asbestos-containing materials, and AEC s UKAS accreditation as a Type C inspection body (number 232). All sample analysis is carried out in AEC s UKAS accredited laboratory (testing laboratory 2054). The survey was carried out by an experienced survey team, who inspect all accessible parts of the building, and look for any installation which, potentially, could contain asbestos. Any suspect materials were sampled and subsequently analysed in accordance with MDHS 77 - Asbestos in bulk materials. This method identifies the asbestos types present and their percentage content. Samples are taken using low - disturbance techniques, whereby a small amount of material (approx. 1 cm³) will be taken, after firstly wetting the sample location with a polyvinyl acetate (PVA) solution spray. This minimises the release of asbestos fibres during the process. Air monitoring carried out during sampling work of this type has shown airborne fibre concentrations to stay below the clearance indicator level of 0.01 fibres per millilitre of air. Sampled materials are immediately placed in sealable, airtight sample bags and appropriately labelled. Sample points will be suitably filled / sealed using PVA spray, Polyfilla or adhesive tape. The surveyors do not disturb any suspected asbestos installation in any other way than to take a representative sample. This measure shall minimise the risk of asbestos fibre release, but shall prevent access above/behind a suspected asbestos installation. It is possible, therefore, that further asbestos materials could be present behind an existing asbestos installation. All relevant sample point data is recorded and shown in the final report e.g. condition, extent of material, etc. It should be noted that the findings of the survey are discussed across the report in its entirety. Readers should note the contents in all sections of the report and should not rely purely on the information given in individual sections of the report. A of 16 Redsands Children s Centre, Nantwich

9 5.0 LIMITATIONS OF SURVEY The exact area covered within the scope of this survey is made up of the following: All accessible areas of the main teaching and accommodation building and also the Secure Unit. Whilst the survey team made every effort to identify all asbestos materials present in the buildings, the possibility remains that some asbestos containing materials may not be detected if they are located in inaccessible areas or are contained within the fabric of the building. The survey team has highlighted any inaccessible areas where it is suspected that asbestos may be present (see section inaccessible areas). A of 16 Redsands Children s Centre, Nantwich

10 6.0 A GUIDE TO THE SURVEY RESULTS An item number is used throughout this report to relate a sampled, strongly presumed or presumed asbestos installation to its location on site. When an asbestos installation is sampled it is given a unique laboratory sample number so that the bulk sample can be traceable within AEC s UKAS accredited laboratory. In addition to the laboratory sample number the bulk sample is given an item number, the item number relates the identified asbestos installation to its location on site. Where a material has not been sampled, but is strongly presumed or presumed to contain asbestos, the material is also given an item number, again relating the strongly presumed or presumed asbestos installation to its location on site. The item number is used throughout this report in Section 7.0 and Section 9.0, on the item number location plans in Appendix I and in the building register and summary of results in Appendix III to help show the client where the asbestos installations are located on site. Appendix I and Appendix III must be read in conjunction with the rest of this survey report, especially Section 7.0 Findings, Section 8.0 Inaccessible Areas and Section 9.0 Recommendations. The certificate of bulk fibre analysis in Appendix II uses a laboratory sample number to show the result of the analysis carried out on a bulk sample taken on site during the asbestos survey. To relate a laboratory sample number on the certificate of bulk fibre analysis to the asbestos register and summary of results in Appendix III, and thus find the location of the asbestos installation on site, simply look up the laboratory sample number in the asbestos register to obtain its item number or vice versa if you are reading the asbestos register and summary of results in Appendix III and wish to obtain further details on the analysis carried out on a bulk sample. For a full explanation of the various headings used in the asbestos register and summary of results table see Appendix III. A of 16 Redsands Children s Centre, Nantwich

11 7.0 FINDINGS 7.1 General Construction The main teaching and accommodation building was constructed in the late 1970s to early 1980s. The building is split into three two-storey accommodation blocks with ground floor teaching and administration areas. The Centre is a residential centre for children with behavioural problems. On the same site there is a separate single-storey Secure Unit with eight bedrooms, communal areas and teaching areas. There is a central courtyard areas and an attached sports hall. The main building is predominantly constructed from brick and concrete with a flat non-asbestos felted roof. The teaching areas are located on the ground floor of the building and have breeze block dividing walls and non-asbestos suspended ceilings with a block & beam construction above. Within the ceiling voids there is Machine Made Mineral Fibre (MMMF) insulation to the pipes and non-asbestos strammit board in places. The office areas have solid walls with a plaster skim applied. Some ceilings are plaster skim and others are non-asbestos suspended ceilings. Skylights where present have wood upstands. Within the forum room there are wood structural beam covers. Floor coverings are a mix of carpet, linoleum and floor tiles. The three accommodation blocks are on two storeys. The ground floor has the communal kitchen and living spaces and the first floor has the bedrooms and bathrooms. Similar construction materials have been used. The boiler room / heating chamber is accessed from the rear of the building and has two Strebel boilers with metal flue pipes extending from the rear. The pipe insulation is MMMF under flexible plastic covers. The two calorifiers have foam compound insulation applied to them. The walls are brick, the floor is concrete and the ceiling is block & beam with plaster skim applied. In the Centre grounds there is a workshop building with a sports hall / play room attached. These rooms are of steel portal construction with brick walls and galvanised roof. The play room is linked directly to the Secure Unit that is separate from the main building. This building has a high steel fence surrounding it. The building is a brick construction with a pitched tiled roof. The building is built around a central courtyard. There are eight single occupancy bedrooms that have plastic coated wall panels. Some of the rooms have en-suite bathrooms that have plastic coated wall panels. In some communal areas there are wood slat ceilings. The corridors and teaching areas generally have plaster skim walls and ceilings. There are several loft access points in the corridors with MMMF loft insulation above. The Rolled Steel Joist (RSJ) support structure and breeze block walls are also visible. Floor coverings are carpet and vinyl. Externally there are wood soffit boards. Within the fenced areas there is a small boiler room with non-asbestos supalux ceiling panels. A of 16 Redsands Children s Centre, Nantwich

12 7.2 Asbestos floor tiles with asbestos bitumen adhesive underneath Asbestos floor tiles with bitumen adhesive underneath, containing a trace proportion of chrysotile (white) asbestos in both installations, were identified in the following areas: The store next to the electrical intake cupboard, grey tiles (item 13). The electrical intake cupboard, grey tiles (item 14). The store next to the general office, grey tiles (item 15). The reception area toilet, grey tiles (item 17). The ground floor of the Rydal accommodation block, grey tiles (item 18). The first floor kitchen in the Telford accommodation block, black tiles under the linoleum (item 23). In all locations the floor tiles are in a fair condition, with areas of minor damage. The floor tiles effectively enclose the bitumen adhesive. In its current condition and location the material presents a very low risk to the health of persons occupying the area. 7.3 Asbestos Floor Tiles Asbestos floor tiles, containing a minor proportion of chrysotile (white) asbestos, were identified in the following areas: In the corridor outside the offices near the Pottery room, grey tiles (item 11). The stairs near to the Pottery room, blue tiles (item 24). The floor tiles are in a fair condition, with areas of minor damage. In its current condition and location the material presents a very low risk to the health of persons occupying the area. 7.4 Asbestos Stair Nosing Asbestos stair nosing, containing a minor proportion of chrysotile (white) asbestos, was identified in the following area: To the stairs outside the Home Economics room (item 04). The stair nosing strips are in fair condition, with areas of localised damage. In its current location and condition the material will present a very low risk to persons entering the area. A of 16 Redsands Children s Centre, Nantwich

13 7.9 Asbestos Bitumen Adhesive Asbestos bitumen adhesive, containing a trace proportion of chrysotile (white) asbestos, was identified in the following areas: Under the non-asbestos grey floor tiles in the store near to the telephone area in the Education department (item 01). Under the non-asbestos grey floor tiles in the corridor outside the home economics room (item 02). Under the non-asbestos grey floor tiles in the left & right side toilets next to the forum room (items 06 & 07). Under the non-asbestos grey floor tiles in the cleaner s store near to the forum room (item 08). Under the non-asbestos grey floor tiles in the food store near to the bin store (item 09). The bitumen adhesive is effectively enclosed by the non-asbestos grey floor tiles, which are in a fair condition. In its current condition and location the material presents a very low risk to the health of persons occupying the area. However, if any of the listed materials are further disturbed, for example by maintenance activities or refurbishment works, there will be a risk of fibre release in the area. A of 16 Redsands Children s Centre, Nantwich

14 8.0 INACCESSIBLE AREAS During the survey, the following areas were found to be inaccessible: All electrical fuse boxes and distribution boards were considered live, and not accessed during this survey. It is possible that fuse boxes contain asbestos materials in a building of this age. Fire doors were not broken into as part of this survey as this could cause significant damage to the doors and place occupants and our surveyors at risk if any asbestos within became damaged. Inside any live pieces of electrical equipment or machinery such as heater units, cookers, boilers etc. for safety reasons. Above the wood slat ceiling in the entrance / waiting area because gaining access would cause damage and would form part of Type 3 survey. Below the carpets because they are fixed down. Internal aspects of the pipe box work in numerous locations around the Centre gaining access would cause damage and would form part of a Type 3 survey. The loft hatch on the first floor in Coniston accommodation block because it was nailed shut. The music store near to the electrical intake cupboard no keys available at the time of the survey. Internal aspects of the air-conditioning unit and associated ducting in the general office / enquiries room as it was considered live. Under the pipe insulation in the boiler room as access would cause damage and would form part of Type 3 survey. The workshop ceiling. Due to AEC ladder safety procedures, areas over 3 metres in height is not accessed from ladders. Internal aspects of the fans in the ceiling of the Secure Unit considered live. Above the wood slat ceilings in the Secure Unit access would form part of a Type 3 survey. The cistern voids in the Secure Unit no access points. Behind the melamine coated wall panels in the Secure Unit no access points. Under the sinks in the Secure Unit no access points. The roof of the Secure Unit for safety reasons. The roof of the workshop & playroom no safe access point. Although the presence of asbestos in these areas is not confirmed, caution should be exercised if any works are carried out there in the future. If any suspect materials are encountered in these areas it is recommended that works cease until such time that the material can be sampled, analysed and confirmed to be asbestos-free. A of 16 Redsands Children s Centre, Nantwich

15 9.0 RECOMMENDATIONS Recommendations are based upon the material assessment, and also on a priority risk assessment basis, using the knowledge of the occupation of the property during the survey, and any known future usage or planned works. In view of the findings of the survey, and it is known that the building is to be safely managed, the following recommendations are made: It is recommended that the asbestos floor tiles, associated asbestos bitumen adhesive and asbestos stair nosing be managed in-situ to prevent damage. The floor tiles should not be cleaned with an abrasive cleaner. If the floor tiles and the bitumen adhesive are to be disturbed as part of any refurbishment plan then they should be carefully removed. Due to the amount of floor tiles and bitumen adhesive present it is recommended that a licensed asbestos removal contractor carry out the work. It is recommended that this report and register be used to form a part of a management plan for this site. The management plan should include regular inspections of any asbestos installations contained within the premises, in order to prevent further damage / exposure to asbestos. It is recommended that an independent, UKAS-accredited asbestos laboratory be employed to manage the asbestos removal, and carry out all visual inspections and air monitoring as outlined in HSE Guidance Notes EH10 and MDHS 39/4. A of 16 Redsands Children s Centre, Nantwich

16 10.0 MANAGEMENT OF ASBESTOS The Control of Asbestos at Work (Amendments) Regulations 2002 were published in November 2002, and Regulation 4 of these Regulations places an explicit duty on persons responsible for buildings (dutyholders) to assess whether asbestos is present and, if so, implement a management plan to safely manage the material. This Regulation came into force on 21 st May Regulation 4 applies to all nondomestic premises, but includes common areas of domestic buildings, such as stairwells, walkways, risers, lift shafts and machinery, tank rooms etc. The asbestos survey of the premises and implementation of the asbestos register goes a long way to compliance with the new regulations, including risk assessment of existing asbestos materials, which is covered in the recommendations section (section 9) of this report. However, the management plan shall require a priority risk assessment of asbestos materials to be carried out by the duty holder, and while recommendations in this report are based on a priority assessment, using the material assessment, and the location of the materials, the surveyor is not necessarily aware of the future use, occupation, and / or maintenance of each installation. There is, however, a duty to carry out further works in the future, and the management plan shall include for the future management of asbestos materials, to ensure that these installations remain safe. Airborne Environmental Consultants Ltd. can provide the following further services to ensure compliance with both the recommendations made in this report, and any future duties to be imposed by the Control of Asbestos at Work Regulations. Regular (say, annual) inspections on the condition of asbestos materials in the premises. This is to ensure that the material remains in a safe condition and is labelled. Future management of asbestos. This can include the preparation of priority risk assessments for the management plan, risk assessments for works within the premises, to the preparation of specifications for their removal as required. Project management of all asbestos removal / treatment works, including competitive tendering of removal works. Independent analytical services such as air sampling following the removal of asbestos, ensuring compliance with existing legislation. Liaison with enforcing authorities, such as the Health and Safety Executive or local authority. AEC have the capability to maintain and to update your asbestos register. This would firstly ensure that asbestos records and procedures are being managed and updated by competent and experienced persons, and also minimise pressure on your management personnel, who would be able to overview the asbestos issue, rather than become involved in the extensive risk assessment and record keeping exercise. A of 16 Redsands Children s Centre, Nantwich

17 APPENDIX I ITEM NUMBER LOCATION PLAN

18 APPENDIX II CERTIFICATE OF BULK FIBRE ANALYS IS

19 APPENDIX III BUILDING REGIS TER & S UMMARY OF RES ULTS

20 Guidance on the Building Register and S ummary of Results. In the register, there is a risk assessment column, and a simple material risk assessment algorithm, in accordance with MDHS 100, achieves this risk assessment (see table in appendix III). This material assessment is a general guide to the risk posed by the asbestos-containing materials, using the product type, damage, surface treatment, and asbestos type to give a risk score (for explanations see below). However, the recommendations in section 9.0 of this report are not solely a product of this assessment. The survey team, using their experience, observations and current / future usage of the premises gleaned from the client, give recommendations based on the usage of the area, future activities, and potential for damage. The register table has a blank Remedial Actions & Date column, designed for future usage. This column should be used when any removal works, remedial actions, labelling or inspections etc are carried out. It is recommended that regular inspections are undertaken to manage asbestos installations as part of a management plan, and that this information is recorded in the column on the register. MDHS 100 states that the person carrying out inspections and assessing the condition of asbestos must be competent and possess enough knowledge about asbestos to make decisions on its continual management. Should your company or organisation not have a competent person, or the human resources to implement regular inspections, AEC can offer an asbestos project management services to visit premises, and update your asbestos register. Explanation of building register and summary of results table: Laboratory Sample Number Where a material has been sampled a unique identification number is written on the sample bag of every bulk sample obtained for bulk sample analysis. The unique laboratory sample number makes the bulk sample traceable within AEC s UKAS accredited laboratory system. Strongly Presumed or Presumed Where a material has not been sampled, but is visually similar to a sampled material then it shall be referenced to an existing bulk sample and noted: strongly presumed as sample x (SP as x), where x is the laboratory sample number of an existing bulk sample submitted for analysis at AEC s UKAS accredited laboratory. Where a material has not been sampled, perhaps due to its inaccessibility and cannot be referenced to a bulk sample taken for analysis, but is strongly presumed or presumed to contain asbestos, then this material shall be noted as strongly presumed (SP) or presumed (P). Item Number Relates a sampled, strongly presumed or presumed asbestos installation to its location on site. When an asbestos installation is sampled it is given a unique laboratory sample number so that the bulk sample can be traceable within AEC s UKAS

21 accredited laboratory. In addition to the laboratory sample number the bulk sample is given an item number, the item number relates the identified asbestos installation to its location on site. Where a material has not been sampled, but is strongly presumed or presumed to contain asbestos, the material is also given an item number, again relating the strongly presumed or presumed asbestos installation to its location on site. Location A description of the exact location of the asbestos installation on site and its location within a certain area. Installation Type of material e.g. boarding, floor tiles, insulation etc. Extent Visual estimate of area (m²), volume (m³), or length (linear metres), of installation. Asbestos types Type of asbestos identified in the material. Samples are analysed in AEC s UKAS accredited laboratory, and certificates of analysis are located in Appendix II of this report. Condition Condition of the installation, from as new, too badly damaged. Treatment Following on from the condition, this section states whether the material is exposed, painted, or encapsulated. Risk Assessment This is gained by adding the scores of the previous sections, using the risk algorithm (see table overleaf). Recommendations These are achieved using the risk assessment algorithm, but also known future usage of the premises e.g. if major works are planned. Recommendations are detailed in Section 9.0 of this report. Remedial Action & Date Column to be used as part of the asbestos management plan. This column should be completed after every inspection, removal, encapsulation, labelling etc.

22 Material Assessment Algorithm Variable Score Examples Installation / Product type 1 Vinyl, Bakelite, Cement. 2 3 Condition / damage Surface treatment Asbestos type Asbestos insulating board, paper, rope. Pipe insulation, spray coating, friable debris. As new. Slight / minor damage. Moderate damage breakage to surface treatment. Major damage smashed or exposed material. Non-friable e.g. vinyl. Enclosed insulation, encapsulated AIB. Unsealed AIB, encapsulated insulation. Unsealed insulation or spray coating. Chrysotile. Amosite & other amphiboles. Crocidolite. The scores from each of the four sections are added together to produce a risk score: Risk score Risk assessment 10 or more High risk 7 9 Medium risk 5 6 Low risk 4 & below Very Low risk