Distance to the edge of the roof

[SRE]

I know this has been done to death before but how close to the edge are you guys fitting panels? We stick to 300 mm, more if we can but once again we're up against someone installing at 100 mm. We're going to lose this job because we are having to fit landscape and portrait whereas the other firm can just about squeeze 2 rows of portrait on with 100 mm left. I'm seeing more and more of this happening and this year's storms don't seem to have made much of a difference.

What are you all doing??

 

[Worcester]

You can go closer so long as you do all the calcs, (and prove them )
we follow the PV Guide:

In determining the appropriate pressure coefficient to use in calculations, the location of the PV array on the roof needs to be determined as some, or all, of the array may be in the “Edge Zone” as defined in BS EN 1991-1.
Pressure coefficients for the Edge Zone will be higher than those in the Central Zone of the roof. BRE digest 489 and the other sources listed above include pressure coefficient values for both Edge and Central zones.

You can go closer:

Unless specifically designed to do so, systems should be kept away from the roof perimeter. For a domestic roof, a suitable minimum clearance zone is around 40-50cm.

Remember the uplift in the edge zone can easily be 3 - 4 times that in the centre zone.

Note – on many roofs a 50cm gap from the edge will still mean that PV modules are fitted in the “Edge Zone” as defined in BS EN 1991-1 where higher pressure coefficients need to be implemented due to the higher imposed wind loads.

 

[telectrix]

dunno about distances trom edge of roof, but it's approx. 12,000 miles to the edge of the world. then you fall off.:lipsrsealed2:

 

[Gavin A]

dunno about distances trom edge of roof, but it's approx. 12,000 miles to the edge of the world. then you fall off.:lipsrsealed2:

also, you need to be more than 1000 miles from scotland to be 100% sure that you'll never wake up one morning to find the proclaimers fallen down at your door.