Risk Assessment Construction Products - Marked Surveillance
Olav Berge NATIONAL OFFICE OF BUILDING TECHNOLOGY AND ADMINISTRATION
Background • According to the “goods package” and the new CPR, marked surveillance shall be risk based. • No experience on risk assessments as a tool for marked surveillance. • A report was conducted by the Danish Technological Institute in order to establish a risk based method for selecting construction products for proactive marked surveillance. • A reference group consisting of Norwegian Construction Associations, Construction Companies, Notified Bodies and Standards Norway, was invited to follow the work. • The final report was delivered in November 2011. • The method for risk assessment will be used by the Norwegian Building Authority for selecting products for marked surveillance in 2012.
Definitions • Failure of product: – A product failing to comply with relevant technical specification, possibly leading to that the construction work does not meet basic work requirements. – A failure in the CE-marking of the product.
• Risk Priority Number (RPN): S x O x D – Severity of a failure in the product = S – Occurrence (frequency of failure) = O – Probability of detection = D
• Risk of wrong end-use of a construction product is not considered in the Risk Priority Number.
Severity of a failure in the product (1) • Severity classification based on the seven Basic Work Requirements (BWR) in the Construction Products Regulation • Relevance of the construction product to the seven different BWRs each gives 1 point. • For the calculation of the Risk Priority Number (RPN) the point score is given as: Sum of BWR + 1 – It is not possible to have severity point score = 0
Severity of a failure in the product (2) Basic Work Requirements
Risk (examples)
1. Mechanical resistance and stability.
Professional evaluation M 105 (Sub: Chimneys)
M 101 (Sub: Windows, doors, etc.)
Collapse in product.
0
0
2. Safety in case of fire.
Spread of fire and smoke.
1
1
3. Hygiene, health and environment.
Mould growth.
0
0
4. Safety and accessibility Objects falling on persons, in use explosions, etc.
1
1
5. Protection against noise.
Noise that threatens health, concentration and sleep.
0
1
6. Energy economy and heat retention
Too high energy consumption.
1
1
7. Sustainable use of natural resources
Use of recycled resources in manufacturing.
1
1
4
5
5
6
Number of basic work requirements (BWR) Severity (S)
Total number of BWR+1
Probability of occurrence (1) Class Age of the ”end of date” Point Score
• Age of technical standard (EN or ETAG)
• Size of Company
• Product type
A
More than 3 years
1
B
1 to 3 years
2
C
Less than 1 year
3
Size of company
Point Score
0-19 employees
2
20-50 employees
1
50 + employees
0
No information
1
Product type
Point Score
A - Bulk
1
B - Component
2
C - System
4
Probability of occurrence (2) Industry (SN 2007) 16. Timber and wood industry.
Point score - Size of company: Companies (number) (0,31 x 2) + (0,28 x 1) + Production (mio. NOK) (0,41 x 0) = 0,9
Total rating: Ex. Windows (EN 14351-1).
Total
Number of employees 0-19
20-49 50 +
1754
122
54
21557 6575
6067
8915
Percentage of total production
100
31
28
41
Point score
0,9
2
1
0
1930
Factor
Points
Age of technical standard (1-3 years)
2
Size of company
0,9
Product type (component)
2
Probability of occurrence (O)
4,9
Probability of detection (1) • AoC system
AoC system
1+
1
2+
2
3
4
Point score
1
2
2
4
4
5
• The ranking is performed by the lowest AoC system for each construction product (as there is a risk of choosing a system not suitable for the application / end-use of the product).
Voluntary system
• Voluntary surveillance system
Point score
No voluntary surveillance system 0 Voluntary system established (covering 100 % of products)
-2
Probability of detection (2) Example: • A product has AoC system 1,3, 4, depending on end use. • A voluntary surveillance system is established and estimated to cover 80 % of the products on the market. AoC system: 4 80 % of goods to be submitted to voluntary surveillance (0,8 x 2) Probability of Detection (D)
Rating 5 -1,6 3,4
D = AoC system + (voluntary surveillance x percentage)
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Risk Analysis (1)
AoC system
1+
1
2+
2
3
4
Point score
1
2
2
6
6
8
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