🏗️ High-Density Slabs & Commercial Supply

Looking for Rockwool RW3, RW4, or RW5?
We specialize in supplying high-density acoustic and thermal slabs for specialized projects. Whether you need standard soundproofing or specific fire-rated insulation, we carry the full range.

RW3 (60kg/m³): Ideal for high-performance acoustic partitions.

RW4 (80kg/m³): Heavy-duty thermal and sound insulation.

RW5 (100kg/m³): Maximum density for industrial and fire-stop applications.

Don’t pay retail for bulk orders. Contact our dedicated sales team today for the best trade prices and live lead times on full-pallet quantities.

Contact Us

Google Reviews ⭐ ⭐ ⭐ ⭐ ⭐

Our clients are repeat customers.

David Robinson

Goods supplied at a very good price. Delivery ahead of time and driver helped stow the boards. Some slight damage from the retaining straps, but nothing that won't cover easily. Would recommend as they seem to be able to get anything.

Shelley Cafer

Amazing customer service received on my first order with Next Day Insulation. Prices were very competitive too and all items were in stock and delivered quickly. I would definitely recommend and will be using them again in the near future. Thanks to Chris for all his help.

MiU Designs

Great customer service and delivered on time to a date that suited our onsite needs. I have used several times for numerous items and will use again! Highly recommend

Mark Jones

Great company to deal with and quick delivery,
What more could you ask for.

Read more reviews here

Why us?

Insulation & Drylining Supplier for London Projects

Next Day Insulation is based in Wembley (HA9), so London is home ground for us. Most of what we send out across the capital goes to three kinds of job: flat conversions and HMOs in Victorian and Edwardian terraces, loft and basement conversions, and commercial fit-outs where partitions and ceilings need to go in fast.

What London jobs usually need

Sound separation in flats and conversions

Converting a house into flats brings the new separating floors and walls under Approved Document E, so sound performance has to be designed in rather than added later. A typical build-up combines acoustic partition roll or high-density slab in the cavity, sound-rated plasterboard on the faces, and resilient bars on ceilings to break the path for impact noise from the flat above.

Cold solid walls in older houses

Much of inner London is solid brick with no cavity to fill. Insulated plasterboard is the quickest way to line these walls when you can't afford to lose much room. If you dot-and-dab it, run a continuous ribbon of adhesive around the board edges and openings so cold air can't circulate behind it.

Fit-outs and ceilings

For offices, shops and new-build apartments we supply MF ceiling systems, metal studs and fire-rated plasterboard. If you're weighing MF against battens or a grid, our suspended ceiling comparison sets out where each one fits.

Getting materials onto a London site

In London, access matters more than distance. A few things to plan for before you order:

  • Kerbside delivery. Vehicles offload to the kerb by crane (reach of around 5m). Upper-floor flats and rear gardens need people on site to carry materials in.
  • Parking and loading rules. Red routes, controlled parking zones and narrow streets can limit where a lorry can stop. Tell us about any restrictions when you order.
  • Next-day availability. Contact us before 10am to check stock and next-day options. Otherwise allow 2–3 working days.
  • Collection. Collection from our depot is available by appointment.

London FAQs

Can you deliver to a flat on an upper floor?

We deliver to the kerb, not inside the building. For upper-floor jobs, have people ready to carry boards up, and choose sheet sizes that will fit through the stairwell and doors.

Which parts of London do you cover?

All of Greater London, from central sites to outer boroughs such as Croydon, Enfield, Romford and Twickenham. For Watford and St Albans see our Hertfordshire page, and for Guildford and Woking see Surrey.

I only need a small quantity. Can I still order?

Online orders start at £350 ex VAT. For smaller amounts, call 0330 133 4833 and we'll see what we can do.

Related project guides

Send us your materials schedule and postcode and we'll confirm stock, delivery options and trade pricing. Contact the team.

Next Day Delivery to you or your site

Minimum Order £350.00 ex. VAT

Contact us for orders below £350.00

Delivery cost £50

£350.00 - £599.00 ex.VAT

Free Delivery

Over £600.00 ex.VAT