We’re fitting an AKW SMC 26mm thick Linea tray 1800mm x 900 directly onto the joists as per manufacturer’s recommendations and hoping for advice about the best way to adhere the tray.
The underside of the tray is webbed and designed for mounting directly to the joists, but the manufacturer’s install details just says, “For wooden floor installation, use a suitable grab adhesive”.
The joists are 8 x 2” at 18” spacing with noggins between them and additional tray support timbers have been added level with the joists so that no part of the tray area is more than 200mm from support. The joists/timbers have been shimmed etc to ensure they’re flush all over and within 0.1 degrees of horizontal. It seems sturdy - but I’ve no reference to compare it with.
Obviously, the adhesive can only go on the joists/timbers so the incidence of where they actually meet the ribs on the tray underside webbing will be limited. Regarding suitable adhesive, it’s often recommended on here to use flexible tile adhesive but is this suitable for an SMC tray too and if so, how thick should this be and how do I stop the adhesive being pushed off the joists/timbers when the tray is lowered etc?
If a particular thickness for flexible tile adhesive / grab adhesive is recommended, what’s the best way to ensure the tray remains perfectly horizonal when lowered onto that adhesive bed? My current plan is to fit a solid spacer of the desired adhesive thickness at each corner of the tray then remove those spacers when the adhesive has set.
Any advice would be greatly appreciated.
