On Jul 25, 8:52*am, JP Coetzee wrote:
On Jul 24, 8:49 pm, Andy Dingley wrote:

I'd suggest attaching a "sub-batten" alongside the wall battens and
stapling the foil down to those.

How about if I staple the foil "half-way down" the thickness of the
batten, i.e.:

Instead of:

-------------------------------------- Foil
* * * * * ##############
* * * * * ##############
* * * * * ##############
* * * * * ### * * * *###
* * * * * ### Batten ###
* * * * * ### * * * *###
* * * * * ##############
###################################### Wood

I do:

* * * * +----------------+ * * * * * * Foil
* * * * | ############## |
* * * * | ############## |
* * * * | ############## |
--------+ ### * * * *### +-----------
* * * * * ### Batten ###
* * * * * ### * * * *###
* * * * * ##############
###################################### Wood

The foil would be pulling at right angles to the staples. Is it likely
to tear?

(That diagram might look funny in a newsreader)

You may be better off using a thin strip of 6mm ply and stapling
through that to the side of the stud.

cheers,
Pete.

cheers,
Pete.