🏗️ 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 Bristol, Bath & the South West

The South West gets more wind-driven rain than most of England, and much of its housing is old: Victorian terraces across Bristol, Georgian Bath stone in Bath, and stone cottages throughout Gloucestershire, Somerset and Devon. Keeping walls dry matters as much as keeping them warm.

Bristol terraces

Bristol's Victorian terraces are mostly solid-walled. Line them with insulated plasterboard where the wall is dry, and top up lofts with loft roll. For loft conversions, use pitched roof boards.

Bath stone and listed buildings

Much of Bath is listed, and the whole city is a World Heritage Site, so many changes to walls and windows need consent. Speak to the council's conservation team first, and talk to us about a build-up suited to traditional stone before ordering.

Render and external wall insulation

For exposed elevations and modern builds, we supply external wall insulation, carrier boards and render systems including K-Rend and KLEiB.

Delivery across the South West

We deliver to Bristol, Bath, Swindon, Gloucester and Exeter. Further west, parts of Cornwall can take longer or fall outside our standard delivery area, so contact us with your postcode before ordering. Deliveries are kerbside with crane offload. Check stock before 10am for next-day options in the main areas; otherwise allow 2–3 working days.

South West FAQs

Do you deliver to Cornwall?

To some parts, with longer lead times. Send us your postcode and we'll confirm.

Can I use insulated plasterboard on a Bath stone wall?

It depends on the wall's condition and whether the building is listed. Get consent where it's needed and check the build-up with us first.

Do you cover the Midlands?

Yes. See our Birmingham & West Midlands page.

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