Description
This Rockwool 80mm slab is FRONTROCK SUPER from ROCKWOOL, a dual-density stone wool board for external wall insulation: a harder top layer for the render to sit on, over a softer insulating core. It is the thinnest slab of the Super line, three 1000 × 600 mm slabs to a 1.8 m² pack, and part of the Renders World mineral wool insulation range.
Where a Rockwool 80mm Dual-Density Slab Fits
ROCKWOOL designs Frontrock Super for walls finished with a thin render system, describing the harder outer layer as protection against mechanical damage both while the facade is being built and once it is in use. At 80 mm it declares 2.20 m²K/W.
- Facades within reach — ground floors, walkways and entrances, where a harder face under the render is worth having.
- Walls with limited depth where 80 mm is what fits under sills and roof edges.
- Solid masonry that needs to keep drying outwards; see the solid-wall retrofit guide.
Why Choose Frontrock Super at 80 mm
- Two densities in one slab. ROCKWOOL puts the compressibility of the hardened top layer at about 40 kPa.
- A1 non-combustible slab, with fire performance that ROCKWOOL states does not deteriorate with time.
- Vapour-open: declared class MU1.
- Stable and water-repellent: DS(70,−) and DS(70,90), short-term absorption up to 1.0 kg/m² and long-term up to 3.0 kg/m².
- Same declared strength as the rest of the range: CS(10)20 and TR10.
Frontrock Super 80 mm Specification
| Property | Declared value |
|---|---|
| Product | ROCKWOOL FRONTROCK SUPER, 80 mm |
| Slab build | Stone wool, dual density, harder top layer |
| Slab size | 1000 × 600 × 80 mm |
| Declared thermal conductivity λD | 0.036 W/mK |
| Declared thermal resistance RD | 2.20 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 | 3 slabs, 1.8 m² |
| Maker's pallet | 20 packs, 36 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). Use the declared 2.20 m²K/W in a U-value calculation.
Fitting the Slab and What Goes With It
Roker U grey adhesive bonds mineral wool facade slabs and carries the mesh layer. The order of work from its data sheet:
- Skim the slab face, then apply the bonding layer combed with a 10 × 10 mm notched trowel, about 4.5–5.5 kg/m².
- Set the slab, tap it into line and stagger the vertical joints.
- No earlier than the next day, anchor through the slab with galvanised metal-pin anchors, at least four per m²; the guide to installing insulation fixings goes through drilling and setting.
- After three days, embed the glass-fibre mesh between two passes of mortar.
Super 80 mm Against the Other Frontrock 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 (this slab) | 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 | dual | 4.40 m²K/W | 2 slabs · 1.2 m² |
At 80 mm the Plus slab declares slightly more resistance and packs five slabs; Super gives up a little of that resistance for the harder outer layer. The mineral wool against polystyrene comparison covers the step back to material choice.
Ordering and Coverage
Each pack covers 1.8 m². Divide the wall area by 1.8 and round up, with extra for cuts around openings. ROCKWOOL palletises this thickness 20 packs, 36 m², to a pallet.
Is Super 80 mm the Right Slab?
- Yes where a Rockwool 80mm slab is the depth available and the facade needs a harder face.
- Take the Frontrock Plus 80 mm where impact is not a concern and you want the extra resistance.
- Move up to the Super 100 mm or deeper when the U-value calculation asks for more.
FAQ — Frontrock Super 80 mm
How much does a pack cover?
Three 1000 × 600 mm slabs, 1.8 m² in all.
Super or Plus at 80 mm?
Plus declares 2.25 m²K/W with λD 0.035; Super declares 2.20 with λD 0.036 but has a harder top layer. Both are A1 slabs with CS(10)20 and TR10.
Which adhesive should I use?
Roker U grey, which covers bonding mineral wool facade slabs and building the reinforced layer on them.
Will 80 mm meet my U-value target?
Enter the declared 2.20 m²K/W with the rest of the wall build-up; the U-value calculation guide shows how. The answer depends on the wall, not the slab alone.
What should the delivery label say?
FRONTROCK SUPER, 80 mm, and declaration RW-CEE-DoP-0237/BCM/23/w1, the same one linked below.
Technical Documents — Frontrock Super