70mm mineral wool insulation is often chosen at the point where structure and performance need to work together. This is the thickness that is commonly used and sits naturally inside many framed systems and does its job without forcing adjustments on site. If you are working with standard stud depths and want reliable results, this is where the solution usually begins.
What is 70mm mineral wool insulation?
70mm mineral wool insulation is a semi-rigid slab. It is made from compressed rock fibres and fits tightly within framed structures. It works by trapping still air within its fibre structure. This slows down heat movement and helps absorb sound at the same time.
This thickness is used where the frame depth is already set. The insulation needs to fit the cavity, not build it up in layers.
It is supplied as slabs rather than rolls. This helps it keep its shape and stay in place during installation.
The material itself is based on rock mineral wool, which is naturally non combustible and stable over time. It does not rely on rigid foams or closed cell gases, but instead uses its dense fibre structure to control both airflow and vibration. That is why it is often chosen in situations where consistent performance is more important than pushing for extreme thermal values.
From a specification point of view, 70mm mineral wool comes as a slab with standard dimensions of 1200 x 600mm, making it suitable for common stud spacing without excessive cutting. It has a thermal conductivity of around 0.038 W/mK, which provides reliable thermal control within a cavity build-up. The product is non combustible and achieves Euroclass A1 to BS EN 13501-1.
This type of insulation is also designed with acoustic performance in mind. The fibre structure absorbs sound across a wide frequency range, helping to reduce noise passing through a construction. As a slab product, it holds its shape and remains in position once fitted, especially when used in friction fit systems such as Flexi.
What is 70mm mineral wool insulation used for?
70mm mineral wool is used where insulation needs to fit inside a defined structure. It sits within the cavity and works as part of the build-up, not on top of it.
It is widely used in framed wall systems. The slabs fit between timber or metal studs and help control both heat and sound. This makes them a reliable choice for internal partitions where reducing noise between rooms matters.
In floor systems, it is fitted between joists. It helps reduce noise between levels and limits heat loss below the floor. This is useful in timber floors and upgrades, where comfort improves after fitting.
In roofs, it is installed between rafters as part of a layered build-up. It supports thermal control and helps reduce external noise.
It is also used in separating walls and floors, including flats and extensions. It helps reduce sound and improve how the structure performs. A tight fit helps stop gaps from forming.
Benefits of 70mm mineral wool insulation
Helps reduce noise between rooms and floors.
Non combustible for added fire safety.
Keeps its shape over time.
Easy to cut and handle on site.
Suitable for walls, floors and roofs.
Delivers reliable results when fitted properly.
Fits standard stud depths for easy installation.
Why choose our 70mm mineral wool insulation?
Most builders do not choose insulation by brand. They choose it based on how it behaves on the site.
At Insulation Wholesale, we focus on materials that work the way they should from the first install. This means clean fitting slabs, consistent sizing and project-ready stock that arrives as expected. No surprises when you open the pack and no wasted time trying to make it work.
We keep pricing practical as well. You will find good prices across single orders, and better value when you step into bulk or pallet deals. For regular work, trade discounts and volume discounts make a real difference over time.
Fast UK delivery is available. Whether it is a site drop or residential delivery, the process stays simple and trackable. You know when it is coming and what is arriving.
We also understand that most jobs do not happen in isolation. You are often working to deadlines, juggling trades and trying to keep things moving without delays. That is why Insulation Wholesale keeps stock ready to go and supports orders that match real project needs, from small upgrades to pallet quantities for larger work.
At Insulation Wholesale, you can purchase 70mm Mineral Wool Insulation at low wholesale prices with fast delivery for most of items within 2-5 days. Competitive rates guaranteed.
FAQ
Where to buy 70mm mineral wool insulation?
You can order it directly from Insulation Wholesale online. Just choose your quantity, add to the basket and check out in minutes. The full range is available with clear stock information.
Can 70mm mineral wool insulation be used in floors?
Yes, it is commonly fitted between floor joists. It helps reduce sound transfer between levels and limits heat loss through the floor. This makes a noticeable difference in noise control.
Is 70mm thick mineral wool enough for insulation?
It works well as part of a system. On its own, it gives solid performance, but results depend on how the full build-up is designed.
70mm Rockwool Flexi has been designed as a multi-use, dual-purpose acoustic and thermal mineral wool insulation with a unique flexible edge along one side. It is suitable for use all over the home, in pitched roof rafters, framed external walls, internal partitions, intermediate floors, separating walls and floors, and timber suspended ground floors.
