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PostPosted: Thu Nov 16, 2017 6:45 pm 
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Looking for advice on how to screw 160mm screws through txg loft boards and 100mm celotex.

How do I make sure I hit the joists right in the centre? and I guess I can't drill pilot holes first. Any advice on the easiest method please.


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PostPosted: Thu Nov 16, 2017 9:37 pm 
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Strips of 18mm ply or larger perhaps 6" wide placed and fixed to the joists at right angles , insulation on top of that should give you a much larger "target area " for your screws. Probably the simplest way.


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PostPosted: Thu Nov 16, 2017 9:56 pm 
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Mark the centre of each end of the joist where you can still see it once the insulation is over the joist, transfer those marks accurately to the face of the insulation, then, either with a chalk line or a straightedge mark a line on the insulation and screw down through the line. Keep the screws perpendicular to the face of the insulation, you'll miss with the odd one now and again, so just go 20mm left/right and you should hit.

Fix each end first and then try for one in the middle, (it's better than gradually wandering off from one end), if you strike gold first time you'll know your marks are accurate and you're good to go with all the rest.

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PostPosted: Fri Dec 01, 2017 5:38 pm 
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Thanks for the advice from both of you.

I've now finished the project and followed the advice of marking each end and then running a line between the two points. I only had one fixing miss out of all of them.

It worked a treat!!!



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