INSTALLATION GUIDE
CBP INSTALLATION
(PEDESTRIAN):
DESIGN STANDARDS All installations should be detailed and constructed in accordance with the relevant British Standard. This is BS7533: Part 3 for installation. For structural design, please refer to either BS 7533 Part 1 & 2 or the Interpave Design Guide. PREPARATION Sub-grade Clear top-soil: complete sub-grade drainage Excavate and back-fill soft spots: compact well throughout Protect sub-grade from adverse weather Lay geotextile fabric or capping layer (if specified/required) Sub-base Prepare in accordance with Specification for Highway Works Lay and compact in layers to a close - textured finish Open-textured sub-bases may require a binding layer of finer material
LAYING
Lay setts in traditional stretcher bond with 6-10mm width joints Ram well into bedding Cut setts as necessary for obstructions etc. (minimum cut lengths: 75mm): dress top arris of cut pieces with a lump hammer to give rounded top edge Fill top joints with limestone dust (approx. 3-4mm down) and ram down Alternatively, use weak dry sand/cement mix, 1:9 mix)
General principles Lay paving immediately on prepared bedding: do not leave bedding exposed to weather or overnight. To avoid bedding layer damage and creep, lay paving units up slopes and/or away from edge restraints. Stand on previously laid paving when placing next row. Block and sett paving Lay fine aggregate laying course (to BS EN 12620 Gf85 0/4mp) to a final compacted thickness of 30mm (in accordance with BS 7533: Part 3). This can be done by either: 1. Compacting 30mm of fine aggregate and screeding a further 15-20mm of loose fine aggregate. (A small trial area may be required to determine the actual surcharge). Or 2. 39-44mm loose fine aggregate screeded to accept blocks. Lay blocks hand tight (2-5mm joints) Bed blocks with vibrating plate compactor fitted with a neoprene sole plate to protect some blocks with special finishes Brush-fill joints with kiln dried silica sand to BS EN 12620 Gf85 0/04 (mp) Vibrate surface again to assist joint filling If necessary during early life top up joints with kiln dried silica sand to BS EN 12620 Gf85 0/04 (mp) to within 1mm of working face by brushing surface FOR COUNTRYSETTS
Note: to prevent mortar staining, keep setts dry during joint filling
Sweep clean, then moisten with watering can fitted with a medium rose FOR COUNTRYSETTS (VEHICULAR):
Lay as traditional granite setts on minimum 100mm of ST1 concrete Bed on 25mm Class 1 mortar with 6-10 mm class 1 mortar joints
For Infilta installation and design guidance, please refer to the AI SUDS Design Guide or contact Charcon Technical Department on 01335 - 372222 or email charcon.technical@aggregate.com
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TECHNICAL INFORMATION: charcon.technical@aggregate.com
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