Explanatory Notes
Crack sealing systems can now be specified using standards laid down by specialist group 2 of the Highway Authorities Product Approval Scheme (HAPAS) administered by British Board of Agrèment (BBA). These guidelines were drawn up by members representing the Highways Agency, Local Government TAG, Transport Research Laboratory, HiTAC and many other interested parties.
The guidelines are available for viewing at http://www.bbacerts.co.uk/pdf/CrackSealingGuideline.pdf
The purpose of devising a standard was to introduce across the industry a standard specification for installation of the many alternative crack sealing systems used across UK roads.
The following is an aide to specify products that comply with the requirements of these standards.
Types of crack sealing systems covered by the BBA HAPAS standard
| System Type |
Grade F-Flexible H-Hard |
Use on crack widths |
Application Type | Elongation requirement i.e. flexibility |
||||
| Simple Overband |
Not |
up to 5mm | Surface applied | No requirement for flexibility | ||||
| Fill & Overband | Not applicable |
5mm to 40mm | Surface applied | Only required for fill component, not the overband |
||||
| Inlaid single crack | Grade H | unlimited | Rebated in the surface typically 20mm |
No requirement for flexibility | ||||
| Inlaid single crack | Grade F | unlimited | Rebated in the surface typically 20mm |
Yes requirement of +30% | ||||
| Inlaid multiple crack | Grade H | unlimited | Rebated in the surface typically 40mm |
No requirement for flexibility | ||||
| Inlaid multiple crack | Grade F | unlimited | Rebated in the surface typically 40mm |
Yes requirement of +30% |
Guidance notes on the specification and use of Grade ‘H’ and Grade ‘F’
Volume 2 Notes for guidance on the specification for Highway Works Series NG700 Road Pavements – General.
Inlaid crack sealing systems are classified by the BBA HAPAS scheme as either Grade F (Flexible) or Grade H (High Modulus). Grade F offers more flexibility but in consequence has a slightly reduced resistance to deformation, i.e. rut resistance. Grade H is less flexible but has a high resistance to deformation. Which grade to specify is a matter of judgement. Where significant crack movement is anticipated, for example in cracks in overlays to jointed concrete carriageways, Grade F may be more appropriate. Where cracks do not penetrate through the pavement structure and significant movement is unlikely to occur, or for small patches in the wheel-tracks, then Grade H may be more appropriate.
Guidance notes on the specification of overbanding systems
Where cracks have penetrated substantially through the pavement depth due to structural failure resulting in significant movement under traffic, no expectation of life can be reliably predicted
All crack sealing systems shall be approved under BBA HAPAS guideline document for the assessment and certification of crack sealing systems for highways issued by the British Board of Agrèment under HAPAS (Highway Authorities Product Approval Scheme) compiled by Specialist Group 2 and ratified by HiTAC.
Materials and installation shall be in accordance with the Manual of contract documents for highway works Volume 1 Soecification for Highways Works Clause 711 Overband and Inlaid Crack Sealing Systems’
Schedules of Rates
Simple Overband
Simple Overband - Tender Schedule of Rates
Maximum band width 40mm
| Unit | Measure | Rate |
| 0 - 500 Lin.m | £/Lin.m | |
| 501 - 1,000 Lin.m | £/Lin.m | |
| 1,001 - 2,500 Lin.m | £/Lin.m | |
| 2,501 - 5,000 Lin.m | £/Lin.m | |
| 5,001 - 10,000 Lin.m | £/Lin.m | |
| Over 10,000 Lin.m | £/Lin.m | |
| Minimum shift charge | £ | |
| BBA HAPAS Certificate Number | ||
Simple Overband - Schedule for specific sites with known quantities
Maximum band width 40mm
| Site Name | Lin.m | Rate £/Lin.m |
| Minimum crew shift charge £ | ||
| BBA HAPAS Certificate Number | ||
Fill & Overband
Fill & Overband - Tender Schedule of Rates
| Lin.m | Width of band |
Rate £/Lin.m |
| 0 - 1,000 | 100 mm | |
| 0 - 1,000 | 150 mm | |
| 0 - 1,000 | 200 mm | |
| 1,001 - 5,000 | 100 mm | |
| 1,001 - 5,000 | 150 mm | |
| 1,001 - 5,000 | 200 mm | |
| 5,001 - 10,000 | 100 mm | |
| 5,001 - 10,000 | 150 mm | |
| 5,001 - 10,000 | 200 mm | |
| Over 10,000 | 100 mm | |
| Over 10,000 | 150 mm | |
| Over 10,000 | 200 mm | |
| Minimum crew shift charge | £ | |
| BBA HAPAS Certificate Number | ||
Fill & Overband - Schedule for specific sites with known quantities
| Site Name | Lin.m | Width of screed | Rate £/Lin.m |
| Minimum crew shift charge £ | |||
| BBA HAPAS Certificate Number | |||
Inlaid Single Crack
Inlaid Single Crack - Tender Schedule of Rates
| Width of planed recess |
Depth of planed recess |
Rate £/Lin.m |
| 100 mm | 10 mm | |
| 100 mm | 15 mm | |
| 100 mm | 20 mm | |
| 150 mm | 10 mm | |
| 150 mm | 15 mm | |
| 150 mm | 20 mm | |
| 200 mm | 10 mm | |
| 200 mm | 15 mm | |
| 200 mm | 20 mm | |
| 250 mm | 10 mm | |
| 250 mm | 15 mm | |
| 250 mm | 20 mm | |
| 300 mm | 10 mm | |
| 300 mm | 15 mm | |
| 300 mm | 20 mm | |
| Minimum crew shift charge £ | ||
| Grade F:Flexible or H:High Modulus | ||
| BBA HAPAS Certificate Number | ||
Inlaid Single Crack - Schedule for specific sites with known quantities
| Site Name | Lin.m | Width of planed recess |
Depth of planed recess |
Grade F:Flexible or H:High Modulus |
Rate £/Lin.m |
| Minimum crew shift charge £ | |||||
| BBA HAPAS Certificate Number | |||||
Inlaid Multiple Crack
Inlaid Multiple Crack - Tender Schedule of Rates
| Width of planed recess |
Depth of planed recess |
Rate £/Lin.m |
| 100 mm | 40 mm | |
| 100 mm | 50 mm | |
| 100 mm | 60 mm | |
| 150 mm | 40 mm | |
| 150 mm | 50 mm | |
| 150 mm | 60 mm | |
| 200 mm | 40 mm | |
| 200 mm | 50 mm | |
| 200 mm | 60 mm | |
| 250 mm | 40 mm | |
| 250 mm | 50 mm | |
| 250 mm | 60 mm | |
| 300 mm | 40 mm | |
| 300 mm | 50 mm | |
| 300 mm | 60 mm | |
| Minimum crew shift charge £ | ||
| Extra over for additional volume over and above the above dimensions: £ per cubic metre |
||
| Grade F:Flexible or H:High Modulus | ||
| BBA HAPAS Certificate Number | ||
Inlaid Multiple Crack - Schedule for specific sites with known quantities
| Site Name | Lin.m | Width of planed recess |
Depth of planed recess |
Grade F:Flexible or H:High Modulus |
Rate £/Lin.m |
| Minimum crew shift charge £ | |||||
| BBA HAPAS Certificate Number | |||||
The Next Stage
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