Fixing to wall help

FreddieFrugal

Hello,

We've been redoing the bedroom, have put in two new pax wardrobes from Ikea which we love. Yesterday went to buy some Besta cabinets to mount as a bridging unit over the bed.

However I'm unsure what fixings to buy to attach them to the wall. Main issue is we now don't have a normal wall - we've got two layers of plasterboard total - 27mm thick. That's all attached to resilient bars which are themselves screwed through a layer of insulation roll onto metal studs, these then have insulation slabs between them. In total it's about 9-10cm from the face of the wall to the block wall behind.

I've looked at lots of fixings, but they don't make it clear on the packaging or info what depth of material they're meant for. Most look like standard single layer of plasterboard.
My worry about the hollow wall fixings such as spring toggles is that they're not actually going into a hollow wall as they're plenty of insulation for them to get stuck on.

Possibly wall anchors might be best bet as they're straight and should just push through the insulation and then tighten up?

We used plasterboard screw plugs on wardrobe but that's just to steady it, it's not bearing full weight.
Don't want them crashing onto our heads!

Any advice appreciated

DirectDebacle

Cut 2 lengths 4x2 (100mm x 50mm) the length of your units. Screw them together. Using this as a template cut out the plasterboard remove insulation etc. Use rawlbolts or whatever suitable fixing to fix 4x2 to blockwork. Screw unit to 4x2. This assumes 100mm from face of p/board to blockwork. Adjust thickness of battening according to site conditions.

I_have_spoken

I assume that fancy wall is to limit noise transmission from next door?

The problem is that anything which goes through into the solid wall will immediately be a conduit for vibrations into the plasterboard. Plus your cabinets will act like amplifiers, resonating with vibrations.

Ruski

As it's a bridging unit, shouldn't the new unit be attached to the wardrobes either side?
Anyhow, a 65mm hollow wall anchor should take up the depth of two sheets of plasterboard ok, and as most of the weight is downwards as opposed to outwards there shouldn't be an issue.

HTH

Russ