Design Specifications The Coniston


The Coniston has been specifically designed to perform in climate conditions that may exist in most given areas of installation. The main factors which are taken into account when deciding on structural design parameters are:


1. Imposed & Super Imposed Load (Wind and Snow)


2. Penetration by Hailstones (Roofing Sheets)


3. Wind Uplift 4. Non – Fragility (Roof)


1. (A) IMPOSED LOAD


In the case of imposed wind loads, our structured polycarbonate sheets, supplied to a maximum width of 1000mm and length of 6000mm, used in conjunction with our canopy system, are capable of withstanding imposed wind loads of up to 1.2 kN per square metre depending on location and size of canopy. A technical specification chart is available on request - please contact us for more details. In the case of “dead” or imposed loading (including snow) these same sheets and glazing bars can withstand loads in excess of 100 kilograms per square metre.


1. (B) SUPER IMPOSED LOAD


An example of super imposed loads would be snow moving from an overhanging or adjacent roof onto a canopy thus exacerbating loads already imposed. Where such a load occurs, it is considered to be over and above any load which has been accounted for in the structural calculations referred to in this design specification. Accordingly, although due account of the possibility of a super-imposed load will be considered prior to installation, the


failure of any canopy due to these factors is deemed to be outside the control of the supplier. We recommend the use of snow guards above the canopy.


2. PENETRATION BY HAILSTONES The possibility of hail penetration to the roofing sheet has been independently tested and is guaranteed to withstand (simulated) conditions produced using a 20mm diameter shot, travelling at 21 metres per second.


3. WIND UPLIFT


In the case of wind uplift, the main design consideration is given to the size of the concrete footing in relation to the area of the canopy and the distance between the supporting posts. Wall mounted canopies which are designed to be used in urban and suburban areas, up to 5 metres above ground level and are correctly installed according to instruction, require one set of support posts to be fixed into a concrete base of 0.96 cubic metres, with a maximum distance between posts of 3.5 metres for projections up to 3 metres and 3 metres for projections from 3 metres to 6 metres.


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Tel: 0800 389 9072


www.ablecanopies.co.uk


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