Loft Joist "Top Slinging" & Fixings

[Matthew Bester]

I am raising my loft joists (100mm) by putting new joists (170mm) across the old ones (perpendicular?), I plan to add more insulation and board an area so I can store stuff up there.

My question is: how should I fix the new joists in place? Do I screw them down from top to bottom, long screws required (170mm+), or can I just go into both at an angle, using shorter screws?

Seemed obvious until I realised how long the screws need to be going top down.

Regards,
Bester

 

[RandomGrinch]

I used these + a washer...

TurboCoach Hex Flange Self-Drilling Coach Screws M6 x 100mm 100 Pack - Screwfix

Order online at Screwfix.com. Zinc yellow-plated with hex head. Self-drilling point and turbo rifled shank provides easy driving and reduced splitting. Suitable for softwood, hardwood or masonry with a nylon plug. FREE next day delivery available, free collection in 1 minute.

www.screwfix.com

With a pilot drill and a 20mm spade bit to go part way through the new joist.