GUIDANCE FOR THE INSTALLATION OF CONCRETE KERBS (EN)

V1.0 GUIDANCE FOR THE INSTALLATION OF CONCRETE KERBS The following information is a simplified version of the detailed information contained in BS 7533 and therefore should be considered guidance for the installation of concrete kerbs. We strongly advise that this guidance is read in conjunction with the relevant BS 7533 standards. Product Inspection Upon delivery, all products should be inspected and any issues identified must be reported prior to installation. Prior to Commencing Installation Prior to commencing, it is good practice to sort the products to ensure consistency of colour, texture and dimensional tolerance.

Health & Safety It is the installer’s responsibility to ensure that all safe working practices are being used and full PPE must be worn. Installation Excavation The depth of excavation required will depend on several factors; the height of the kerb or edging selected, the orientation that it will be laid, and the intended upstand. (i.e The difference in height between the top of the kerb or edging and the paved surface). Excavate to the desired depth and fully compact the ground. Bedding of Units The inclusion of a sub-base beneath the kerbs is not usually necessary as the kerbs and edgings are laid on a concrete bed. The bed and kerb unit will restrain the sub-base for any adjacent paving.

Kerb and edging units should be placed onto a bed of C7/8 or ST1 concrete. (Image 1) the typical mix for this concrete is 6 parts aggregate, 3 parts sharp gritty sand and 1 part cement. (Strength 7 N/mm 2 ) The bed should be sufficiently deep for the chosen product and application. See typical details in annex 1. Image 1 Tobermore Guidance for the installation of Concrete Kerbs - V1.0 1

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V1.0 Guidance for the Installation of Concrete Kerbs Laying to line and level Kerb units should be placed onto the concrete bed and tapped down to line and level using string lines to ensure the correct positioning is achieved. See images 2 & 3. Image 2 Image 3 Joints Kerbs and edgings can be laid close jointed with 2 - 4mm joints without the use of mortar or with wider 5 - 10mm joints pointed with mortar. See Images 6 and 7. Butt jointing (i.e. products touching) is not recommended as this can lead to units chipping. Special shaped units such as droppers, radii kerbs and corners are bedded in the same way as standard units.

Where mortared joints are used, allowance should be made for expansion by omitting mortar from a joint every 15 metres. The mortar should be allowed to harden sufficiently before the kerbs or edgings are haunched. A concrete haunch should be placed behind the kerbs or edgings. Haunching is where concrete is placed at the rear of the kerb to hold them in place. (Image 4) The concrete haunch should be brought up to around two thirds of the height of the kerb or edging. It should be smoothed off using a trowel or shovel. (Image 5) Sometimes it may have to be reduced to accommodate the materials that will be at the back of the kerb. (eg: the paving).

Allow the concrete to harden before commencing the paving to avoid displacing the kerbs. Image 4 Image 5 Tobermore Guidance for the installation of Concrete Kerbs - V1.0 2

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V1.0 Guidance for the Installation of Concrete Kerbs Tolerances All products are manufactured with permitted dimensional tolerances. Bedding onto a concrete bed allows any tolerances in height to be accommodated during installation. Image 6 - Close Joints Image 7 - Mortar Joints Wide joints should be fully filled with mortar. (Image 7) Extreme care should be taken to ensure that decorative kerbs to do not become stained with mortar. Any excess mortar should be cleaned off immediately with clean water. Important: Standard kerb units and special kerb units will have been manufactured at different times and therefore slight shade variations are unavoidable.

Any slight variations will dissipate as the product matures. Inclement Weather During poor weather the installation should be stopped. It is good practice to cover the kerbs if the weather conditions are such that the work may be put at risk. Laying should not be undertaken when the temperature is below 3 o C. At the end of the working day all unfinished areas and opened packs of products should be covered to prevent saturation by rain. Tobermore Guidance for the installation of Concrete Kerbs - V1.0 3

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V1.0 Annex 1 1. Fusion Kerb 2. Fusion Edge 150 25 50 Size: 145 (w) x 255 (d) x 915 (long) 50 Surface 50 80 Normally 125 70 Surface 100 150 300 3. Kerb Large / Tegula Kerb Large DIMENSION BETWEEN TOP OF KERB AND TOP OF CONCRETE HAUNCHING 4. Kerb Small All Kerbs & Edgings to be installed to the relevant British Standard Bedding and haunching to be concrete class ST1 (C7/8) or stronger depending on application. Minimum bed thickness of 100mm. Tobermore Concrete Ltd will not be liable for any loss or damage resulting from the use or reliance on any drawings provided Tobermore Guidance for the installation of Concrete Kerbs - V1.0 4 : 75 (w) x 150 (d) x 90 0 (long)

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