robust details

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robustdetails

The Inspectorate aims to provide a high level of confidence in the robust details scheme. It is

effectively an additional layer of consumer protection which does not replace, but is

supplementary to, the responsibilities of building control bodies and warranty providers. It involves

the collection and review of performance data

robustdetails

• Spot check visual inspections and sound tests

• No enforcement powers

• If any serious problems cannot be resolved, notify BCB

• Withdraw any robust detail that consistently fails to meet required standards

Performance Monitoring

Part E Robust Details

robustdetails


Visual Inspections.

robustdetails

Green : These are plots that when inspected comply fully with the Robust Detail.

Amber : These are plots where the inspector has identified slight deviations from the Robust Detail that could be easily put right and the builder agrees to do so within twenty eight days. In these cases the inspector is of the view that the fault or faults identified would

not have any significant reduction on the sound insulation performance.

Red : These are plots where the inspector has identified significant deviation from the Robust Detail which is likely to lead to a

significant reduction in performance.

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EW

M1

EW

M2

EW

M3

EW

M4

EW

M5

EW

M6

EW

M7

EW

M8

EW

T1

EW

T2

EW

S1

EW

S2

EW

S3

EF

C1

EF

C2

EF

C3

EF

C4

EF

C5

EF

C6

EF

C7

EF

T1

EF

T2

EF

T3

EF

S1

0

100

200

300

400

500

600

700

Total to date.

robustdetails


Green visual inspections = 72.3%

Amber visual inspections = 17.1%

89.4% of all Robust Details are built correctly

or so nearly perfect as makes no difference.

Red visual inspections = 10.6%

Out of the 10.6% red visual inspections only

2.1% would actually translate to a failed test.

robustdetails


Spot Check Field Tests.

robustdetails


Green CategoryIn this category the test results meet or exceed the requirements of the RD

performance standards. Specifically:-

47 dB DnT,w + Ctr or greater and/or 60 dB L’nT,w or lower.

Amber CategoryResults in the Amber Category fail to meet the requirements of the RD performance

standards but satisfy the requirements of the Building Regulations Part E. Specifically:-

45 or 46 dB DnT,w + Ctr and/or 61 or 62 dB L’nT,w.

Red CategoryResults in the Red Category have failed to meet the requirements of the Building

Regulations Part E. Specifically:-

44 dB DnT,w + Ctr or lower and/or 63 dB L’nT,w or greater.

robustdetails


EW

M1

EW

M2

EW

M3

EW

M4

EW

M5

EW

M6

EW

M7

EW

M8

EW

T1

EW

T2

EW

S1

EW

S2

EW

S3

EF

C1

EF

C2

EF

C3

EF

C4

EF

C5

EF

C6

EF

C7

EF

T1

EF

T2

EF

T3

EF

S1

0

100

200

300

400

500

600

700

Total to date.

robustdetails


robustdetails


66646260585654525048464544424038

120

100

80

60

40

20

0

AIRBORNE dB (DnT,w + Ctr)

Frequency

45dB

Mean 53.04Sample Size 1066

EWM4 AIRBORNE HISTOGRAM - ALL DATA

1.5%<45dB

robustdetails


robustdetails


100

125

160

200

250

315

400

500

630

800

1000

1250

1600

2000

2500

3150

Frequency, Hz.

10

20

30

40

50

60

70

80

Dn

T, d

B.

First floor.

Ground floor.

EWM4_E0419002H

robustdetails


robustdetails


6058565452504846454442

50

40

30

20

10

0

AIRBORNE

Frequency

45dB


EFC1 AIRBORNE HISTOGRAM - ALL DATA

2.0%<45dB

robustdetails


robustdetails


626058565452504846444240383634

40

30

20

10

0

IMPACT dB (Ln'T,w)

Frequency

62dB


EFC1 IMPACT HISTOGRAM - ALL DATA

0%>62dB

robustdetails


robustdetails


EWM8 – a recent addition.

robustdetails


robustdetails


64626058565452504846454442

18

16

14

12

10

8

6

4

2

0


Frequency

45dB


EWM8 AIRBORNE HISTOGRAM - ALL DATA

0%<45dB

robustdetails


robustdetails


Robust Details Ltd (RDL) monitors the construction of a sample of robust details by carrying out visual inspections of, and acoustic testing on, a percentage of plots registered.

Acoustic testing of E-WM-7 has identified cases of unacceptable levels of acoustic performance where some types of wall tie have been used. RDL has therefore, taken the step of temporarily suspending E-WM-7 for the registration of new plots, or amending existing plot registrations from another RD type to E-WM-7, pending further investigations. It is anticipated that a revised version of the E-WM-7 pattern will be published once these investigations have been completed.

Our investigations to date have shown that an acoustic performance sufficient to satisfy the requirements of Robust Details has been achieved where the two leaves of the cavity separating wall are untied. To date, there have been no reported under performing tests using this form of construction. However the suitability of this approach in any particular case should be based on appropriate advice from a structural engineer.

Should you wish to adopt this form of construction, outside of the robust details scheme, we would strongly advise that you seek the block manufacturers guidance. It would also be necessary to consult with your building control body about their likely requirements for pre-completion testing.

robustdetails


robustdetails


605856545250484645444240

35

30

25

20

15

10

5

0


Frequency

45dB


EFC3 AIRBORNE HISTOGRAM - ALL DATA

<45dB 2.7%

robustdetails


7270686664626058565452504846444240

25

20

15

10

5

0

IMPACT dB (Ln'T,w)

Frequency

62dB


EFC3 IMPACT HISTOGRAM - ALL DATA

>62dB 10.4%

robustdetails


robustdetails

• Spot check visual inspections and sound tests

• No enforcement powers

• If any serious problems cannot be resolved, notify BCB

• Withdraw any robust detail that consistently fails to meet required standards

Performance Monitoring


robustdetails

The Inspectorate aims to provide a high level of confidence in the robust details scheme. It is

effectively an additional layer of consumer protection which does not replace, but is

supplementary to, the responsibilities of building control bodies and warranty providers. It involves

the collection and review of performance data

robustdetailsrobustdetailsrobustdetails

thankyou

www.robustdetails.com

robust details

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