Description
This Rockwool 160mm slab is the deepest board in the Renders World mineral wool insulation range: FRONTROCK SUPER from ROCKWOOL, dual-density stone wool for external wall insulation under render. It declares 4.40 m²K/W, and a pack holds two 1000 × 600 mm slabs, 1.2 m².
Where Rockwool 160mm Stone Wool Goes
160 mm is for walls that need a high resistance from the insulation layer and have the depth to take it: wide sills or sills that will be extended, generous roof overhangs and no boundary to clear.
- Whole elevations where the wall calculation calls for about 4.40 m²K/W from the slab.
- Solid masonry that should stay vapour-open; the solid-wall retrofit guide covers the wider retrofit.
- Facades at ground level that benefit from the harder top layer.
Why Choose Frontrock Super at 160 mm
- 4.40 m²K/W declared — the highest of the six slabs, against 3.30 for the 120 mm.
- Dual density: ROCKWOOL gives about 40 kPa compressibility for the hardened top layer.
- A1 slab with fire performance that ROCKWOOL states does not deteriorate with time.
- Vapour-open (MU1) and water-repellent (up to 1.0 kg/m² short term, 3.0 kg/m² long term).
- CS(10)20 and TR10 declared, the same as the thinner slabs.
Frontrock Super 160 mm Specification
| Property | Declared value |
|---|---|
| Product | ROCKWOOL FRONTROCK SUPER, 160 mm |
| Slab build | Stone wool, dual density, harder top layer |
| Slab size | 1000 × 600 × 160 mm |
| Declared thermal conductivity λD | 0.036 W/mK |
| Declared thermal resistance RD | 4.40 m²K/W |
| Reaction to fire (the slab) | Euroclass A1 |
| Compressive strength at 10 % deformation | CS(10)20 — 20 kPa |
| Tensile strength perpendicular to faces | TR10 — 10 kPa |
| Short-term water absorption | WS — up to 1.0 kg/m² |
| Long-term water absorption | WL(P) — up to 3.0 kg/m² |
| Water vapour diffusion resistance | MU1 |
| Dimensional stability | DS(70,−) and DS(70,90) |
| Thickness tolerance | T5 |
| Pack | 2 slabs, 1.2 m² |
| Maker's pallet | 12 packs, 14.4 m² |
| Standard and declaration | EN 13162:2012+A1:2015 · DoP RW-CEE-DoP-0237/BCM/23/w1 |
Declared in DoP RW-CEE-DoP-0237/BCM/23/w1 (ROCKWOOL Polska, Cigacice, EN 13162, notified body 1023). The U-value calculation guide shows how 4.40 m²K/W combines with the rest of the wall.
Packs and Pallets at 160 mm
At this depth a pack holds two slabs, 1.2 m², so divide the wall area by 1.2 and round up, with extra for cuts at openings. ROCKWOOL palletises 160 mm at 12 packs, 14.4 m², to a pallet.
Installing the 160 mm Slab Under Render
Roker U grey adhesive bonds mineral wool facade slabs up to 30 cm thick, so it covers 160 mm in a single layer, and it also builds the mesh layer. From its data sheet:
- Skim the slab face, apply the bonding layer and comb it with a 10 × 10 mm notched trowel, roughly 4.5–5.5 kg/m².
- Press the slab on, tap it true and stagger the vertical joints.
- From the next day, anchor with galvanised metal-pin anchors long enough for 160 mm of slab plus adhesive, at least four per m²; see the fixing pattern and spacing guide.
- After three days, bed the mesh in mortar: one pass under it, one over it.
How 160 mm Compares With the Thinner Slabs
| Slab | Density | Declared RD | Pack |
|---|---|---|---|
| Frontrock Plus 50 mm | single | 1.40 m²K/W | 6 slabs · 3.6 m² |
| Frontrock Plus 80 mm | single | 2.25 m²K/W | 5 slabs · 3.0 m² |
| Frontrock Super 80 mm | dual | 2.20 m²K/W | 3 slabs · 1.8 m² |
| Frontrock Super 100 mm | dual | 2.75 m²K/W | 3 slabs · 1.8 m² |
| Frontrock Super 120 mm | dual | 3.30 m²K/W | 3 slabs · 1.8 m² |
| Frontrock Super 160 mm (this slab) | dual | 4.40 m²K/W | 2 slabs · 1.2 m² |
Every slab in the table shares the same declared fire, strength and vapour classes; thickness and pack size are what change.
Is 160 mm the Right Choice?
- Yes when the calculation needs 4.40 m²K/W and the sills and roof line allow a Rockwool 160mm slab plus render.
- Take the Super 120 mm if 3.30 m²K/W is enough or the depth is tight.
- Use the Frontrock Plus 50 mm in reveals and soffits where 160 mm will not fit.
FAQ — Frontrock Super 160 mm
How much does a pack cover?
Two slabs of 1000 × 600 mm, 1.2 m².
Which adhesive can bond 160 mm?
Roker U grey covers mineral wool facade slabs up to 30 cm thick, so 160 mm is well within its scope; it also forms the reinforced layer.
How does it compare with the 120 mm slab?
It declares 4.40 m²K/W against 3.30, with the same fire, strength and vapour classes. Packs hold two slabs instead of three.
Is the slab non-combustible?
Yes, Euroclass A1 is declared for the slab. The rendered wall is classified as a system; the facade fire requirements briefing covers that difference.
Could two 80 mm slabs replace one 160 mm?
ROCKWOOL declares 2.20 m²K/W for an 80 mm Super slab and 4.40 for the 160 mm. One 160 mm slab means one bonding pass and one layer of joints; whether a double layer is allowed is for the render system’s documentation to say.
Technical Documents — Frontrock Super