Warm flat roof fixings.....

Joined
15 Mar 2010
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Location
Wrexham
Country
United Kingdom
My flat roof needs replacing and I'm going to install a warm roof. A friend of mine who is a roofer would prefer to use torch on felt, but that leaves me wondering what fixings to use to secure the thick 'sandwich' of OSB and insulation - I'd prefer the plastic tube type where the screw ends up deep inside just leaving the plastic dome showing, but of course they're not suitable. Any ideas?
 
or lots of 200mm screws or both

I guess I could use screws with these washers:
Screenshot_20200803-222934_Chrome.jpg
 

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