Hi. I'm wanting to put some villaboard up in our (gutted) bathroom. The walls are a mix of timber stud wall and single-skin brick wall. The villaboard will ultimately be tiled so I dont want any chance of the villaboard moving or coming unstuck. The problem is with the brick sections - which are on most of the walls up to about the 1.4 metre mark. I know the preferred method is to fix battens and nail the villaboard to those - but it is vital that I dont shrink the room any further. The tech support people at James Hardie said that I could use a wallboard adhesive such as Maxbond, but were otherwise somewhat unhelpful. Still, using an adhesive seems to be the way to go.
I read the maxbond label and it seems the product is designed to be applied in a bead about 6mm thick. My problem is that the brick walls, although reasonably true, are too uneven-surfaced for this - there would not be enough contact area as the flat board would only contact the ridges, not the valleys. What I need is something more like using stud adhesive, where I use a large dollop which has the effect of compensating for the undulations in an uneven surface. I havent been able to find a product that functions like this. Does anyone know of such a product - or have any other suggestions for fixing?
I was told by the guy in Bunnings that they used to stock a cement based product which was designed to be used in this way, but he couldnt remember the name or supplier.