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alexpau
G PACK You need 6mm screws to comply with BRE regulations on a 35mm rafter which HILTI sell and are approved under Eurocodes along with item - MSP-RHC-B HILTI ITEM - 435504
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The issue is for example if the roof timber is 80mm wide then if you drill into the centre of the timber ie 40mm then the diameter of the drilled hole cannot be bigger than 10mm to comply with building regs this is partly the problem in why you cannot use hanger bolts for fixing slates as they will not allow for compliance with building regs in UK roof timber
Hi I will send you the information you need just a quick note with regards to using a companies roof hook with someones elses rail etc how will you cover this under warranty as most manufacturers offer around a 10 yr warranty on there mounting systems this would not apply if you mix manufacturers systems as its only complete systems which carry the warrant. i.e. Azur roofs hooks with Schuco rail!
All this makes sense and and fixing to an under slate would be the correct thing to do, when fixing to a rafter or batten you may or may not need extra timber it really depends on the width of the timber to comply with Eurocode and Buiding regs. On 35mm - 38mm timber battens you should only be using stainless steel 6mm screws which have been approved for use with Solar PV systems.
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