🏗️ 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.

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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 Supplies for Kent

Kent combines some of the oldest housing in the South East with some of its biggest growth areas. Weatherboarded cottages, oast houses and timber-framed period homes sit alongside large new developments around Ebbsfleet, Dartford and Ashford, many of them built in timber frame.

Timber-frame new builds

Timber-frame homes are insulated between the studs rather than in a masonry cavity. Our timber and steel frame boards are made for that job, and a vapour control layer on the warm side protects the frame. See our membranes.

Period cottages and weatherboarded homes

Older Kent houses often have timber frames, lime plaster and wall constructions that need to breathe. Before insulating, check for listed status or conservation area rules, and talk to us about the build-up so you don't trap moisture against old timber. A loft top-up with loft roll is usually the safest first step.

Cladding and rainscreen projects

For commercial and residential schemes using rainscreen or cladding systems, we supply cladding insulation boards, plus fire-rated plasterboard and MF ceilings for the interiors.

Delivery across Kent

We deliver to Dartford, Maidstone, Canterbury, Ashford, Tunbridge Wells, Medway and the rest of the county. Deliveries are kerbside with crane offload. Rural lanes can limit lorry access, so let us know if your site is down a narrow track. Check stock before 10am for next-day options; standard delivery is 2–3 working days.

Kent FAQs

Which insulation is best for a timber-frame wall?

Boards or slabs sized to fit between the studs, with a vapour control layer on the room side. Tell us the stud depth and spacing and we'll match a product.

Can I insulate a listed cottage?

Often, yes, but many changes need listed building consent. Speak to your council's conservation officer first.

Do you cover Essex and Surrey?

Yes. See our Essex and Surrey pages.

Related project guides

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