🏗️ 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 Supplies for Essex

Essex orders reflect the county's mix of housing: plenty of bungalows and chalet bungalows, exposed homes along the coast from Southend to Clacton, and a lot of new building around Chelmsford and along the Thames Gateway.

Chalet bungalows and rooms in the roof

Chalet bungalows have bedrooms built into the roof, with sloping ceilings, short knee walls and small loft voids. They're notoriously cold upstairs. The usual fix is to insulate the sloped ceilings with pitched roof boards or insulated plasterboard, insulate behind the knee walls, and top up the flat loft sections with loft roll. Keep the ventilation paths at the eaves open.

Coastal properties

Homes near the coast face salt air and wind-driven rain. Make sure walls are sound and dry before insulating. For external upgrades, our external wall insulation and KLEiB render systems give a weatherproof finish.

New builds around Chelmsford and the Thames Gateway

For developers and housebuilders around Basildon, Thurrock and Chelmsford, we supply cavity boards, floor insulation, plasterboard and fixings in pallet quantities, with bulk pricing on request.

Delivery across Essex

Delivery is available across Essex, including Chelmsford, Basildon, Colchester and Southend. Deliveries are kerbside with crane offload, Monday to Friday. Saturday delivery may be available for an additional charge. For next-day options, contact us before 10am to confirm stock availability and delivery to your postcode. Standard delivery is typically 2–3 working days.

Essex FAQs

How do I insulate the upstairs of a chalet bungalow?

Treat the sloped ceilings, knee walls and loft floor sections as separate areas. Send us the room dimensions and we'll work out quantities for each.

Do you supply new-build sites?

Yes, with pallet pricing. Email sales@nextdayinsulationltd.co.uk with your materials schedule.

Do you cover Kent and London?

Yes. See our Kent and London 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