markharro Posted May 25, 2023 Share Posted May 25, 2023 Anyone have any advice on this? Need to drive 100mm stainless steel screw through softwood battens then into roof rafters. Guessing it may be best to pilot hole first? Link to comment Share on other sites More sharing options...
Mr Punter Posted May 25, 2023 Share Posted May 25, 2023 I would do clearance holes through the battens - maybe 5mm so you can load the screws. Assuming you have lots to drill, you could stack the battens and do 3 at a time. Once you have set one up you can use this as a template. If screwing into the rafter without a pilot is tricky you could do a 4mm pilot but not full depth. Link to comment Share on other sites More sharing options...
JohnMo Posted May 25, 2023 Share Posted May 25, 2023 Buy self drilling screws? Link to comment Share on other sites More sharing options...
Temp Posted May 25, 2023 Share Posted May 25, 2023 https://www.diydata.com/carpentry/screw-holes/wood-screw-holes.php Says.. Pilot 2.0 or 2.4 (softwood) 2.8mm (hardwood). As they are SS I would go on the larger side. Perhaps even 3mm. Link to comment Share on other sites More sharing options...
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