I found that our builder doesn't include any wall wrap as standard, but in asking for them to quote for it, there's the simple question of which product to use?
Maybe it's not worth getting at all, but I figure the advantage is as a moisture barrier, and to help the insulation work better by restricting air flow, protecting against contact with the brick, plus some reflective insulation. Perhaps it isn't so important here in Adelaide, as the air is generally dry, and perhaps less need for a moisture barrier?
The thing I find odd is to do with the reflectivity of the wall-wrap. It looks like most wall wrap products are single-sided reflective, with the reflective side on the inside. With the R2.5 of insulation in the walls, I believe that reflectivity is pretty useless as there is no air gap on the inside, but rather you want the reflectivity outwards to the cavity. There are some double-sided reflective products around, with one bright, and one dull side, but these don't seem geared to wall wrapping.
So given that everyone is filling walls with batts now, what is a suitable wall-wrap to use with brick veneer? I'm guessing an anti-glare reflective surface on the outside, with emittance of 0.05 or less, and appropriate vapour and water barrier properties. Where do I find such a thing?