wall ties for cavity against existing wall

If it's getting full fill batts, you don't need retaining clips, you simply lay a row of blocks and poke the batts down (keep the cavity clean!)...when you require ties, simply drill, plug and screw in.

Don't attempt to install all the screw-iun ties and the batts before building - it will only end in tears.

Do you push the ties through the battts (make a little slit) ? Simon.

The batts are the same height as two blocks, so you shouldn't really need to, but if you do need to, you can simply drill through, screw in and push the fibreglass onto it - they rip quite easily and most screw-in ties are the 'fishtail' type.

Make sure you use stainless ones.

And I've just realised you meant 'tears' as in 'rips', whereas I meant 'tears' as in tears before bedtime.