MINERAL WOOL ROCKWOOL
5 products
Showing 1 - 5 of 5 products
How to choose
- Which line suits the job?FRONTROCK PLUS has the lowest declared conductivity, in 50 mm. FRONTROCK SUPER has a harder top layer, in 80, 100, 120 and 160 mm.
- How thick?Your wall design sets it. The table further down gives the declared thermal resistance of each slab: PLUS 50 mm, SUPER 80 mm or SUPER 160 mm.
- What goes with the slabs?Roker U adhesive for the wool, fixings, and mesh with base coat.
- Quick picksThinnest: PLUS 50 mm. Deepest: SUPER 160 mm. At 80 mm: SUPER.
These are mineral wool insulation slabs for the outside of a wall: ROCKWOOL FRONTROCK facade slabs of non-combustible stone wool, made for ETICS, an insulated wall finished with thin-coat render. They are not rolls for the loft. Renders World sells five of these mineral wool slabs, in two lines, FRONTROCK PLUS and FRONTROCK SUPER.
Pick the line first, then the thickness. PLUS is single-density with the lower declared conductivity. SUPER has a harder top layer and goes up to 160 mm. Every slab is 1000 x 600 mm.
Mineral Wool Insulation for Rendered Walls: What the Slabs Declare
Both lines are declared to EN 13162:2012+A1:2015, the standard for factory-made mineral wool for thermal insulation of buildings. The values below come from the Declaration of Performance for each line: FRONTROCK PLUS No RW-CEE-DoP-0238/BCM/23/w1 and FRONTROCK SUPER No RW-CEE-DoP-0237/BCM/23/w1, both dated 07-09-2023. They apply to both lines unless a line is named.
- Non-combustible. Euroclass A1, stone wool. The class is declared for the slab itself and does not change over time. It is the class of the slab, not of a rendered wall.
- Vapour-open. Class MU1, so water vapour passes through the wool.
- Water absorption. Short-term WS, at most 1 kg per square metre; long-term WL(P), at most 3 kg per square metre.
- Strength. Compressive stress at 10 % deformation CS(10)20, which is 20 kPa, and tensile strength perpendicular to the faces TR10, which is 10 kPa.
- True to size. Thickness tolerance class T5, and dimensional stability, the steadiness of size under heat and humidity, DS(70,90) for PLUS and DS(70,-) and DS(70,90) for SUPER.
- Thermal values that stay put. The declarations state that the declared conductivity and thermal resistance do not change over time.
Five FRONTROCK Slabs: Thickness, Thermal Resistance and Pack Size
RD is the declared thermal resistance of the slab in m²K/W. Each pack holds the number of slabs shown and covers the area shown, so you order by the pack.
| Slab | Type | Thickness | Declared RD (m²K/W) | Slabs per pack | Pack covers |
|---|---|---|---|---|---|
| FRONTROCK PLUS 50 mm | Single density | 50 mm | 1.40 | 6 | 3.6 m² |
| FRONTROCK SUPER 80 mm | Dual density | 80 mm | 2.20 | 3 | 1.8 m² |
| FRONTROCK SUPER 100 mm | Dual density | 100 mm | 2.75 | 3 | 1.8 m² |
| FRONTROCK SUPER 120 mm | Dual density | 120 mm | 3.30 | 3 | 1.8 m² |
| FRONTROCK SUPER 160 mm | Dual density | 160 mm | 4.40 | 2 | 1.2 m² |
The thermal resistance printed here is the maker's declared figure for the slab alone. ROCKWOOL packs and delivers its products on pallets.
PLUS or SUPER: Which Line Fits the Job
Both lines of mineral wool insulation share their strength, water and vapour classes. What separates them is the conductivity, the top layer and the thicknesses on offer.
- Choose PLUS for the lowest declared conductivity, 0.035 W/mK, in 50 mm. It is a single-density mineral wool slab.
- Choose SUPER for dual-density mineral wool with a hardened top layer, declared at 0.036 W/mK. The maker puts the compressibility of that layer at about 40 kPa, a figure from its product page rather than a declared class, and says it protects the facade against mechanical damage in use and during installation.
- Need more depth? Only SUPER comes in 100 mm, 120 mm and 160 mm.
- Prefer polystyrene board? Take a look at our EPS insulation boards.
How to Install the Slabs in an ETICS
These ROCKWOOL facade slabs are used in two-layer ETICS. The mineral wool is bonded to the wall, fixed, then covered with a reinforced layer and the render.
- Bond. ATLAS Roker U adhesive bonds mineral wool slabs up to 30 cm thick, so every slab here is within its range. It also makes the reinforced layer on them. It comes in 25 kg paper bags.
- Fix. Mechanical fixings are chosen from our fixing accessories.
- Reinforce. Mesh and base coat are in the adhesives and basecoats collection.
The build-up layer by layer is set out on our external wall insulation page. On an older solid-wall house, our guide to EWI on Victorian solid-wall homes covers the retrofit side of the job.
Delivery, Pallets and Returns
- Courier. Renders World sends goods by courier the next business day (express) or in two business days (economy).
- Pallets. Pallets up to 1200 kg go next day, or in 2 business days on the economy option. Deliveries run 8:00 to 17:00 and are kerbside only.
- Keep them dry. Pallets are shrink-wrapped but not weatherproof, so protect them from moisture once they are on site.
Delivery is not calculated automatically online. After you order, the team contacts you to set out the delivery method. If you change your mind, return the goods within 14 days in original condition. Goods in paper bags, tinted products and special orders are excluded, and that includes the 25 kg paper bags of Roker U. The Renders World store is at Unit 9A, Central Trading Estate, Southampton SO14 5JP: Monday to Friday 7:00 to 17:00, Saturday 7:00 to 12:00, Sunday closed. Phone 023 8200 2442.
FAQ: ROCKWOOL FRONTROCK Slabs
Which adhesive goes with these slabs?
Roker U, the adhesive made for mineral wool and EPS, which also forms the reinforced layer over the wool. Choose it, the fixings and the mesh and base coat in the same order.
How many packs do I need?
Divide the wall area in square metres by the pack coverage in the table for your thickness, then round up to whole packs. If the wall has many openings, call the store on 023 8200 2442 before a large order.
How thick should the slab be?
The thickness comes from the thermal design of your wall, not from the wool. The table gives the declared thermal resistance of each slab for that calculation.
Is mineral wool insulation or polystyrene better under render?
Both are used in thin-coat systems, and the right one depends on the wall and the project. Stone wool is non-combustible (A1) and vapour-open (MU1). Our wool and polystyrene comparison sets the two side by side.
Does Euroclass A1 make the whole wall A1?
No. A1 is the class of the slab. A rendered wall is a separate question, and the rules for facades on a given building are in our guide to Building Safety Act facade fire requirements.
Can I leave the pallet outside?
Only under cover. The shrink-wrap is not weatherproof, so keep the wool away from moisture until it goes on the wall.
Order the Right Slab
- Pick the slab. Choose your mineral wool insulation by line first, then take the thickness from the table.
- Add the rest. Put Roker U and your fixings in the same order.
