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Cordek Ltd
Spring Copse Business Park Slinfold West Sussex RH13 0SZ Tel: 01403 799600 Fax: 01403 791718 Agrément Certificate e-mail: [email protected] 12/4916 website: www.cordek.com Product Sheet 1
CORDEK VENTILATION VOID FORMERS VENTFORM PANELS
This Agrément Certificate Product Sheet(1) relates to Ventform Panels, a range of profiled expanded polystyrene (EPS) panels for use as ventilating void formers under suspended reinforced concrete ground-floor slab and ground-bearing concrete slab constructions, to facilitate the passive ventilation of hazardous gases (eg landfill gas and radon) emanating from the ground beneath the building. (1) Hereinafter referred to as ‘Certificate’.
CERTIFICATION INCLUDES: • factors relating to compliance with Building Regulations
where applicable • factors relating to additional non-regulatory information
where applicable • independently verified technical specification • assessment criteria and technical investigations • design considerations • installation guidance • regular surveillance of production • formal three-yearly review.
KEY FACTORS ASSESSED Ventilation capacity — when used in conjunction with an appropriate gas-resistant membrane and adequate vents to the outside of the building, the panels will facilitate the effective passive ventilation of hazardous gases emanating from the ground beneath the building subject to the ventilation capacity limits given in this Certificate (see section 6).
Structural performance — the panels have adequate strength to resist short-term construction phase load loading and long-term loads transmitted from the floor construction without undue deformation (see section 7).
Thermal performance — the panels can contribute towards achieving the design U values specified in the national Building Regulation requirements for a building (see section 8).
Durability — the long-term durability of the panels has been assessed and is adequate for the design life of the building (see section 10).
The BBA has awarded this Certificate to the company named above for the products described herein. These products have been assessed by the BBA as being fit for their intended use provided they are installed, used and maintained as set out in this Certificate.
On behalf of the British Board of Agrément
Date of Third issue: 20 February 2020
Originally certificated on 31 May 2012
Hardy Giesler Chief Executive Officer
The BBA is a UKAS accredited certification body – Number 113. The schedule of the current scope of accreditation for product certification is available in pdf format via the UKAS link on the BBA website at www.bbacerts.co.uk
Readers are advised to check the validity and latest issue number of this Agrément Certificate by either referring to the BBA website or contacting the BBA direct. Any photographs are for illustrative purposes only, do not constitute advice and should not be relied upon.
British Board of Agrément Bucknalls Lane Watford Herts WD25 9BA
©2020
tel: 01923 665300
[email protected] www.bbacerts.co.uk
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Regulations
In the opinion of the BBA, Ventform Panels, if installed, used and maintained in accordance with this Certificate, can satisfy or contribute to satisfying the relevant requirements of the following Building Regulations (the presence of a UK map indicates that the subject is related to the Building Regulations in the region or regions of the UK depicted):
The Building Regulations 2010 (England and Wales) (as amended)
Requirement: A1(1) Loading Comment: Floors incorporating the products can be designed to sustain and transmit dead and
imposed floor loads to the ground. See section 7 of this Certificate. Requirement: C1(2) Preparation of site and resistance to contaminants Comment: The products, used in conjunction with an appropriate gas-resistant membrane, can
contribute to a floor structure satisfying this Requirement. See section 6 of this Certificate.
Requirement: L1(a)(i) Conservation of fuel and power Comment: When used with additional layers of insulation, the products can contribute to
satisfying this Requirement. See section 8 of this Certificate. Regulation: 7(1) Materials and workmanship Comment: The products are acceptable. See section 10 and the Installation part of this Certificate.
The Building (Scotland) Regulations 2004 (as amended)
Regulation: 8(1) Durability, workmanship and fitness of materials Comment: The products can contribute to a construction satisfying this Regulation. See section 10
and the Installation part of this Certificate. Regulation: 9 Building standards applicable to construction Standard: 1.1(a) Structure Comment: The products contribute to satisfying the relevant requirements of this Standard, with
reference to clause 1.1.1(1)(2). See section 7 of this Certificate. Standard: 3.1 Site preparation — harmful and dangerous substances Standard: 3.2 Site preparation — protection from radon gas Comment: The products, used in conjunction with an appropriate gas-resistant membrane, can
contribute to a floor structure satisfying these Standards with reference to clauses 3.1.6(1)(2) and 3.2.2(1)(2). See section 6 of this Certificate.
Standard: 6.2 Building Envelope Comment: When used with additional insulating layers, the products can contribute to satisfying
the requirements of this Standard, with reference to clauses 6.2.1(1)(2) to 6.2.3(1)(2). See section 8 of this Certificate.
Standard: 7.1(a) Statement of sustainability Comment: The products can contribute to meeting the relevant requirements of Regulation 9,
Standards 1 to 6 and therefore will contribute to a construction meeting a bronze level of sustainability as defined in this Standard.
Regulation: 12 Building standards applicable to conversions Comment: All comments given for the products under Regulation 9, Standards 1 to 6 also apply to
this Regulation, with reference to clause 0.12.1(1)(2) and Schedule 6(1)(2). (1) Technical Handbook (Domestic).
(2) Technical Handbook (Non-Domestic).
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The Building Regulations (Northern Ireland) 2012 (as amended)
Regulation: 23(a)(i) Fitness of materials and workmanship Comment: (iii)(b)(i) The products are acceptable. See section 10 and the Installation part of this Certificate. Regulation: 26(i)(a)(b) Site preparation and resistance to contaminants Comment: The products, used in conjunction with an appropriate gas-resistant membrane, can
contribute to a floor structure satisfying this Regulation. See section 6 of this Certificate.
Regulation: 30 Stability Comment: Floors incorporating the products can be designed to sustain and transmit dead and
imposed floor loads to the ground. See section 7 of this Certificate. Regulation: 39(a)(i) Conservation Measures Regulation: 40(2) Target carbon dioxide Emission Rate Comment: When used with additional insulating layers, the products can contribute to satisfying
the requirements of these Regulations. See section 8 of this Certificate.
Construction (Design and Management) Regulations 2015 Construction (Design and Management) Regulations (Northern Ireland) 2016 Information in this Certificate may assist the client, designer (including Principal Designer) and contractor (including Principal Contractor) to address their obligations under these Regulations. See section: 3 Delivery and site handling (3.1 and 3.6) of this Certificate.
Additional Information
NHBC Standards 2020 In the opinion of the BBA, Ventform Panels, if installed, used and maintained in accordance with this Certificate, can satisfy or contribute to satisfying the relevant requirements in relation to NHBC Standards, Chapters 4.1 Land quality – managing ground conditions, 5.1 Substructure and ground bearing floors and 5.2 Suspended ground floors.
Technical Specification
1 Description 1.1 Ventform Panels comprise a flat EPS square panel top piece with dimensions of 1200 by 1200 mm, and of either 40 or 70 mm thickness, with integral EPS projections (legs) of varying profile and length beneath (see Figure 1).
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Figure 1 Ventiform panels
1.2 The panels are available in four different overall depths, giving different ventilation capacities, and with six maximum load capacities (see Table 1).
Table 1 Panel grades and performance characteristics Ventform
panel
specification
Overall
depth of
panel
(mm)
Maximum
short-term
load
capacity
(kN·m–2)
Leg
height
(mm)
Ventilation capacity
Equivalent clear
void depth(1)
(mm)
Nominal ventilated
cross-sectional area(2)
as seen in elevation
(mm2 per m width of floor)
80/20
80/30
80/40
80/50
100/20
100/30
100/40
100/50
150/9
150/13
200/9
200/13
80
80
80
80
100
100
100
100
150
150
200
200
20
30
40
50
20
30
40
50
9
13
9
13
40
40
40
40
60
60
60
60
80
80
130
130
19
19
19
19
30
30
30
30
60
60
100
100
11500
11500
11500
11500
18200
18200
18200
18200
37100
37100
60400
60400
(1) Equivalent clear void depth after making allowance for the panel top and the panel legs. (2) Ventilated cross sectional area available for the through-flow of air.
1.3 Ancillary items used with Ventform Panels, but outside the scope of this Certificate, are:
gas-resistant and damp-proof membrane — specification with third-party approval or equivalent
air bricks and/or telescopic underfloor ventilators
cavity trays.
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2 Manufacture 2.1 The panels are moulded from flame-retardant grade EPS in accordance with BS EN 13163 : 2012. Different EPS grades are used to create the different load-bearing capacities. 2.2 As part of the assessment and ongoing surveillance of product quality, the BBA has:
agreed with the manufacturer the quality control procedures and product testing to be undertaken
assessed and agreed the quality control operated over batches of incoming materials
monitored the production process and verified that it is in accordance with the documented process
evaluated the process for management of nonconformities
checked that equipment has been properly tested and calibrated
undertaken to carry out the above measures on a regular basis through a surveillance process, to verify that the specifications and quality control operated by the manufacturer are being maintained.
2.3 The management system of the manufacturer has been assessed and registered as meeting the requirements of BS EN ISO 9001 : 2015 by BSI (Certificate FM 37531).
3 Delivery and site handling 3.1 The panels are delivered to site shrink-wrapped in polythene sheet, in packs of 10 to 15 panels. 3.2 Each panel is embossed with the Certificate holder’s name, the product name and the product specification (depth/maximum load capacity). 3.3 The panels must be protected from high winds and prolonged weathering and stored under cover to avoid prolonged exposure to sunlight. 3.4 The panels must be stored flat, on a firm, level and dry base, and be fully supported to ensure that they do not distort or bow. 3.5 Contact with solvents and organic-based materials should be avoided. 3.6 The panels must not be exposed to flame or ignition, and careful consideration should also be given to the management of fire risk when in storage.
Assessment and Technical Investigations The following is a summary of the assessment and technical investigations carried out on Ventform Panels.
Design Considerations
4 General 4.1 Ventform Panels are satisfactory, when used in accordance with this Certificate, for use as a ventilated void former beneath suspended reinforced concrete floor slabs and ground-bearing concrete floor slabs, to facilitate the passive ventilation of hazardous gases (eg landfill gas or radon) emanating from the ground under the building. 4.2 To provide an effective gas protection system, the panels must be used with a suitable gas-resistant membrane(1) and have adequate ventilation arrangements provided through external walls of the building to allow air to enter and circulate freely through the void created by the panels (see section 6). (1) Membrane third-party certificated.
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4.3 Detailed guidance on the design and detailing of protective measures for buildings constructed on gas contaminated land is given in the national Building Regulations, BS 8485 : 2015 and the following BRE Reports:
BRE Report 211 BR 211 : 2015
BRE Report 212 BR 212 : 1991
BRE Report BR 376 : 1999
BRE Report BR 413 : 2001
BRE Report BR 414 : 2001. 4.4 The panels are not designed for use in ground subject to clay heave.
5 Practicability of installation The panels are designed to be installed by a competent general builder, or a contractor, experienced with these types of products.
6 Ventilation capacity
6.1 Where subfloor ventilation is to be provided as part of the gas protection measures, the engineer responsible for the design of the building should determine the required ventilation capacity in accordance with design documents referenced in section 4.3, taking account of:
the recorded concentration of the soil gas
the known or likely volumetric emission rates of gas
the area and shape of the slab
the location of the building, the prevailing wind direction and the topography of the surrounding ground. 6.2 The appropriate panel specification should be selected with a ventilation capacity at least equal to that calculated. Equivalent clear void depth and ventilated cross-sectional area per metre width of panel are given in Table 1 for each panel specification. 6.3 The design must incorporate adequate provision in the form of air bricks, telescopic vents and other means to allow air to enter into and circulate freely within the void created by the panels. The type and location of the vents should be determined by the engineer responsible for the design of the building and should be shown on the construction drawings. Minimum vent opening sizes are given in the design guidance documents referenced in section 4.3.
7 Structural performance
7.1 For suspended, reinforced concrete floor slabs, the appropriate panel specification is selected according to the proposed finished thickness of the concrete slab. To limit the maximum anticipated compressive creep deformation of the panel to an acceptable level of 2 mm or less, the maximum uniformly distributed load (UDL) carried by the panels during the initial period (1 to 16 hours) from
commencement of the concrete pour must not exceed the maximum load capacity of the panels (see Table 1). The design UDL should include the weight of the wet concrete and an allowance for heaping of the concrete during pouring. The minimum allowance for heaping should be taken as 1.5 kN·m–2, but may need to be increased depending on the methods used for placing and compacting the concrete. 7.2 For ground-bearing floor slabs, the panel specification should be selected so that it also limits the anticipated maximum long-term (50-year) compressive creep deformation to the level determined by the structural design engineer responsible for the design of the building. This will depend on the type of building and its intended use. 7.3 Anticipated 50-year compressive creep deformations and permissible design loads for each panel specification are given in Table 2. In all cases, the design load should be taken as the maximum combination of unfactored dead and imposed load likely to be transmitted to the panels, determined in accordance with BS EN 1990 : 2002 and BS EN 1991-1-1 : 2002, and their UK National Annexes.
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Table 2 Long-term creep deformation — ground-bearing long-term creep compression Panel specification Maximum anticipated 50-year
compressive creep deformation
under a design load equal to
maximum load-bearing capacity
of the panel (%)
Maximum permissible design
load to limit 50-year creep
deformation to 2%
(kN·m–2)
Panel depth
(mm)
Maximum load-carrying
capacity of the panel
(kN·m–2)
80 and 100
80 and 100
80 and 100
80 and 100
150 and 200
150 and 200
20
30
40
50
9
13
5
5
6
7
5
5
13
20
25
30
6
9
7.4 For both suspended and ground-bearing floor slabs, the structural engineer responsible for the design of the building should confirm the adequacy of the bearing substrate to carry maximum short- and long-term design loads transmitted through the panels. 7.5 Provision should also be incorporated into the design to limit short-term concentrated loads that could cause localised damage to the panels and gas-resistant membrane (for example, reinforcement spacers). Reinforcement spacers should be selected with large base areas and should be located at sufficiently close centres to ensure that the maximum load beneath the spacer does not exceed the maximum short-term load-carrying capacity of the panel (see Tables 1 and 2). Where necessary, load-spreader plates should be specified beneath the reinforcement spacers.
8 Thermal performance
8.1 Depending on the panel specification selected, a typical floor construction comprising a 150 mm concrete slab constructed above Ventform Panels and having a p/a ratio between 0.4 and 0.9, will achieve a calculated U value between 0.27 and 0.40 W·m–2·K–1. Designers should allow for additional insulation as required to satisfy the typical design U values quoted in the documents supporting the
national Building Regulations
8.2 Calculation of specific design floor U values should be completed in accordance with BS EN ISO 13370 : 2017, BS EN ISO 6946 : 2017 and BRE Report BR 443 : 2006. All floor constructions incorporating Ventform Panels should be treated as suspended. The thermal conductivity values given in Table 3 should be used for the panels. The panels may be ‘simplified’ as plane boards with the ‘effective’ thicknesses given in Table 3. Alternatively, detailed thermal modelling may be carried out in accordance with BS EN ISO 10211 : 2017.
Table 3 Design values for use in U value calculations
Ventform panel specification
(panel depth/grade) Thermal conductivity 90/90
(W·m–1·K–1)
Panel ‘effective’ thickness
(mm)
80/20 and 100/20
150/9 and 200/9
80/30 and 100/30
150/13 and 200/13
80/40 and 100/40
80/50 and 100/50
0.036
0.036
0.035
0.035
0.039(1)
0.038(1)
48
71
48
71
48
48
(1) For the 80/40, 80/50, 100/40 and 100/50 panels, the thermal conductivity values quoted have been determined
from available mean thermal conductivity data with an increment added as no 90/90 values were available.
8.3 Care should be taken during detailed design to avoid thermal bridging at junctions.
9 Maintenance 9.1 Once installed, the panels do not require maintenance.
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9.2 To ensure effective ventilation of the void space created beneath the floor construction, airbricks and other venting devices installed in the perimeter walls of the building must be inspected at intervals and maintained free of blockage.
10 Durability
The products will perform effectively as a void former for the life of the building. They are rot-proof and water-resistant, dimensionally stable under varying conditions of temperature and humidity, and unaffected by exposure to radon, methane and carbon dioxide.
11 Reuse and recyclability The products are made from EPS, which can be recycled.
Installation
12 General 12.1 Installation of Ventform Panels must follow the requirements of this Certificate and the Certificate holder’s installation instructions. Adequate supervision must be maintained and, if required, the Certificate holder’s specialists, experienced in site practice and installation of the material, will attend the site to provide demonstrations to ensure correct installation. 12.2 Normal precautions for handling EPS materials should be taken to avoid damaging the panels during off-loading, storage, handling and installation. Any damaged panels must be replaced before pouring the concrete. 12.3 Protection from wind uplift may be required during installation.
13 Preparation 13.1 All loose material, eg vegetation, must be removed prior to installation of the panels. 13.2 Preparation and levelling of the formation must be as specified on the construction drawings prepared by the structural engineer responsible for the design of the building. This may comprise a layer of concrete blinding over a layer of hardcore, or a compactable blinding. 13.3 Ventilators must be installed in accordance with the construction drawings on opposite walls with sufficient air gaps in any intervening walls to ensure that no stagnant gas pockets (dead zones) exist, or are created (see Figures 2 and 3). The ventilators must be placed securely and sealed in position, and must be leak-tight. 13.4 Where cavity trays are specified, care should be taken to ensure continuity with the gas-resistant membrane.
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Figure 2 Typical suspended floor slab construction
Figure 3 Typical ground-bearing floor slab construction
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14 Procedure 14.1 The panels should be arranged to minimise the amount of cutting and re-shaping. Panels must be butted tightly together, ensuring that all gaps are minimal. Any gaps formed must be no greater than the maximum that can be bridged by the gas-resistant membrane. Where cutting is unavoidable, this can be easily completed using a fine tooth saw. 14.2 Once the panels have been installed, a compatible damp-proofing and gas-resistant membrane is laid over the panels with all sealing, joints and details carried out strictly in accordance with the membrane manufacturer’s instructions. 14.3 Service entries can be accommodated by cutting the panels to ensure a tight fit. Where holes or cuts are made in the gas-resistant membrane, these must be made good using the sealing and jointing compounds and methods (eg tapes and top-hats) specified by the membrane manufacturer. 14.4 The membrane must be checked thoroughly for integrity by a competent person and any damaged repaired prior to concrete placement. 14.5 To provide protection and avoid damage during the construction phase, such as laying reinforcement and during pouring and placing of the concrete floor slabs, a suitable protective layer can be laid over the gas-resistant membrane. 14.6 Reinforcement spacers should be carefully selected and positioned as set out in section 7.5. 14.7 Trafficking across panels should be minimised, and concrete poured from a low height or concrete pumping equipment used to avoid localised impact or overloading.
Technical Investigations
15 Investigations 15.1 An assessment was made of existing data to determine:
long/short term creep
thermal performance
resistance of EPS to methane gas
durability. 15.2 Typical U values were derived for the floor system using modelling and calculation in accordance with BS EN ISO 10211 : 2007, BS EN ISO 13370 : 2007, BS EN ISO 6946 : 2007 and BRE Report BR 443 : 2006. 15.3 The manufacturing process was evaluated, including the methods adopted for quality control, and details were obtained of the quality and composition of the materials used. 15.4 An assessment was made of the practicability of installation, including site handling.
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Bibliography BRE Report BR 211 : 2015 Radon : guidance on protective measures for new dwellings
BRE Report BR 212 : 1991 Construction of new buildings on gas-contaminated land
BRE Report BR 376 : 1999 Radon : guidance on protective measures for new dwellings in Scotland
BRE Report BR 413 : 2001 Radon : guidance on protective measures for new dwellings in Northern Ireland
BRE Report BR 414 : 2001 Protective measures for housing on gas-contaminated land
BRE Report BR 443 : 2006 Conventions for U value calculation
BS 8485 : 2015 + A1 2019 Code of practice for the design of protective measures for methane and carbon dioxide ground gases for new buildings
BS EN 1606 : 2013 Thermal insulating products for building applications — Determination of compressive creep
BS EN 1990 : 2002 + A1 : 2005 Eurocode — Basis of structural design NA to BS EN 1990 : 2002 + A1 : 2005 UK National Annex to Eurocode — Basis of structural design
BS EN 1991-1-1 : 2002 Eurocode 1 — Actions on structures — General actions — Densities, self-weight, imposed loads for buildings NA to BS EN 1991-1-1 : 2002 UK National Annex to Eurocode 1 — Actions on structures — General actions — Densities, self-weight, imposed loads for buildings
BS EN 13163 : 2012 + A1 : 2015 Thermal insulation products for buildings — Factory made products of expanded polystyrene (EPS) — Specification
BS EN ISO 6946 : 2007 Building components and building elements — Thermal resistance and thermal transmittance — Calculation method BS EN ISO 6946 : 2017 Building components and building elements — Thermal resistance and thermal transmittance — Calculation method
BS EN ISO 9001 : 2015 Quality management systems — Requirements
BS EN ISO 10211 : 2007 Thermal bridges in building construction — Heat flows and surface temperatures — Detailed calculations BS EN ISO 10211 : 2017 Thermal bridges in building construction — Heat flows and surface temperatures — Detailed calculations
BS EN ISO 13370 : 2007 Thermal performance of buildings — Heat transfer via the ground — Calculation methods BS EN ISO 13370 : 2017 Thermal performance of buildings — Heat transfer via the ground — Calculation methods
BS EN ISO 14001 : 2015 Environmental management systems — Requirements with guidance for use
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Conditions of Certification
16 Conditions 16.1 This Certificate:
relates only to the product/system that is named and described on the front page
is issued only to the company, firm, organisation or person named on the front page – no other company, firm, organisation or person may hold or claim that this Certificate has been issued to them
is valid only within the UK
has to be read, considered and used as a whole document – it may be misleading and will be incomplete to be selective
is copyright of the BBA
is subject to English Law. 16.2 Publications, documents, specifications, legislation, regulations, standards and the like referenced in this Certificate are those that were current and/or deemed relevant by the BBA at the date of issue or reissue of this Certificate. 16.3 This Certificate will remain valid for an unlimited period provided that the product/system and its manufacture and/or fabrication, including all related and relevant parts and processes thereof:
are maintained at or above the levels which have been assessed and found to be satisfactory by the BBA
continue to be checked as and when deemed appropriate by the BBA under arrangements that it will determine
are reviewed by the BBA as and when it considers appropriate. 16.4 The BBA has used due skill, care and diligence in preparing this Certificate, but no warranty is provided. 16.5 In issuing this Certificate the BBA is not responsible and is excluded from any liability to any company, firm, organisation or person, for any matters arising directly or indirectly from:
the presence or absence of any patent, intellectual property or similar rights subsisting in the product/system or any other product/system
the right of the Certificate holder to manufacture, supply, install, maintain or market the product/system
actual installations of the product/system, including their nature, design, methods, performance, workmanship and maintenance
any works and constructions in which the product/system is installed, including their nature, design, methods, performance, workmanship and maintenance
any loss or damage, including personal injury, howsoever caused by the product/system, including its manufacture, supply, installation, use, maintenance and removal
any claims by the manufacturer relating to CE marking. 16.6 Any information relating to the manufacture, supply, installation, use, maintenance and removal of this product/system which is contained or referred to in this Certificate is the minimum required to be met when the product/system is manufactured, supplied, installed, used, maintained and removed. It does not purport in any way to restate the requirements of the Health and Safety at Work etc. Act 1974, or of any other statutory, common law or other duty which may exist at the date of issue or reissue of this Certificate; nor is conformity with such information to be taken as satisfying the requirements of the 1974 Act or of any statutory, common law or other duty of care.
British Board of Agrément Bucknalls Lane Watford Herts WD25 9BA
©2020
tel: 01923 665300
[email protected] www.bbacerts.co.uk
