STREETSCAPE GUIDANCE

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HOME INTRODUCTION PART A A vision for London’s streets PART B From strategy to delivery PART C New measures for new challenges PART D Balancing priorities PART F Appendix PART E Physical design and materials SECTION 6 Introduction SECTION 7 High quality footways SECTION 8 Carriageways SECTION 9 Crossings SECTION 10 Kerbside activity SECTION 11 Footway amenities SECTION 12 Safety and functionality SECTION 13 Street environment SECTION 14 Transport interchanges Streetscape Guidance [Part E – Physical design and materials] High quality footways 70 Yorkstone slabs for footways TLRN standards: Colour: Natural buff Finish: Diamond sawn Dimensions: Dimensions: 900x600x75mm slabs (standard) or variable lengthx600x75mm Application: • Yorkstone paving should be considered for use in conservation areas, sites of historic significance and locations with a high civic importance • Existing Yorkstone should be recycled Figure 68: 900x600mm Yorkstone slabs Advantages: • Attractive, organic appearance • In keeping with much of London’s traditional character • Low maintenance • Has a long lifespan if installed well; 60 years or more • Can be cut to size and dressed as required • Can be laid to sit alongside concrete slabs – this requires an aesthetic transition line, for example, tactile paving, crossover, etc Disadvantages: • High material cost • Prone to fracturing if on an inadequate subbase • Installation requires excellent workmanship • Prone to staining Considerations: • Most locations should use a diamond sawn finish. However, it may be appropriate to use a flame texture, riven or reclaimed Yorkstone for repairs or to match an existing area • To minimise waste and maintain a high quality finish, the length of the Yorkstone slab may be less than the prescribed 900mm, as long as it remains greater than the width and has a minimum bond stagger of at least 150mm • Service ducting should be aligned in a strip and a flag removal method should be identified to minimise damage during service maintenance • Loading requirement must be considered when designing joints and structure. It is important to evaluate mechanical sweeping when designing a footway and in such cases butt finishes should be avoided. Bedding materials should be selected with equal care dependant on loading. Construction: • No break joints less than 150mm on alternate courses and they should not be notched into each other • Joints between slabs should have a uniform 8-10mm joint or if the specification is for close joints, the dimension is five to six millimetres Figure 69: Yorkshire paving sits well alongside granite and concrete paving
HOME INTRODUCTION PART A A vision for London’s streets PART B From strategy to delivery PART C New measures for new challenges PART D Balancing priorities PART F Appendix PART E Physical design and materials SECTION 6 Introduction SECTION 7 High quality footways SECTION 8 Carriageways SECTION 9 Crossings SECTION 10 Kerbside activity SECTION 11 Footway amenities SECTION 12 Safety and functionality SECTION 13 Street environment SECTION 14 Transport interchanges Streetscape Guidance [Part E – Physical design and materials] High quality footways 71 Asphalt surfacing for footways TLRN standards: Colour: Neutral grey Finish: Variable aggregate gradings acceptable Dimensions: Typically up to 25mm thick (surface course) Application: • Footways where structures such as cellars, subways or bridges are located directly beneath the surface • Footways carrying shallow utilities • Expansive areas of footway in suburban or rural-suburban areas with grassed verges • Footways where vehicles regularly mount the kerb Figure 70: Asphalt paving • Cycle lanes and tracks • Heavy footway crossovers • Asphalt surfacing should not be disregarded as an inferior product to paving slabs as it can achieve an equally high quality finish when executed well. Always consult an experienced materials engineer to help decide on the appropriate bituminous mixture for particular surfacing requirements • Shared footway/cycleways Advantages: • Construction is relatively fast and straightforward • Finish is even and joint-free thereby reducing the risk of trip hazards and cracking • Durable • Easy to reinstate and recycle Disadvantages: • Reinstatement of asphalt paving can create a ‘patchwork’ effect • A crossfall of two per cent is required • Can deform with frequent heavy vehicle overrun if underlay is insufficient Considerations: • For areas that have a higher place value, consider using 300mm wide granite kerbs to emphasise the pedestrian realm • Where it is anticipated services will regularly need to be accessed asphalt is not recommended as frequent reinstatement will degrade the appearance • It is recommended that mastic asphalt is used for areas where waterproofing is essential Construction: • Recommendations for the laying of various asphalts are given in BS 594987 Figure 71: Westminister Bridge is paved with asphalt and wide kerbs
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STREETSCAPE GUIDANCE Third Edition
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STREETSCAPE GUIDANCE

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