🏗️ 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 Birmingham & the West Midlands

Across Birmingham, Solihull, Coventry and the Black Country, many of our orders go to one type of job: extending and converting the region's large stock of interwar and post-war semi-detached houses. Rear extensions, loft conversions and garage conversions all need the same core materials, and getting the build-up right first time saves trouble at inspection.

Rear and side extensions

A typical single-storey extension needs insulation in three places:

Check the U-values on your drawings or from building control, and we'll help you match board thicknesses to them.

Loft conversions

Converting a 1930s hipped roof means insulating the slopes, not the loft floor. Most conversions use pitched roof PIR boards between the rafters with a further layer or insulated plasterboard underneath to reduce cold bridging through the timbers. Leave a ventilation gap above the boards where the roof design calls for one.

If you're only topping up an existing loft rather than converting it, loft roll laid across the joists is the cheaper route. Our loft insulation guide covers the depths.

Garage conversions

A garage conversion usually means raising and insulating the floor, lining single-skin walls and bringing the roof up to standard. Insulated plasterboard and PIR cover most of it. Tell us the wall and floor construction and we'll suggest a build-up.

Delivery across the West Midlands

We deliver throughout Birmingham, Solihull, Coventry, Wolverhampton, Walsall and Dudley. Deliveries are kerbside with crane offload, so on a busy residential street make sure there's somewhere for the boards to land. For next-day dispatch, check stock with us before 10am; standard delivery is 2–3 working days.

Birmingham FAQs

What thickness of PIR do I need for an extension floor?

It depends on the U-value on your drawings and the board's thermal conductivity. Send us the target U-value and floor build-up and we'll recommend a thickness.

Can you supply the whole extension package?

Insulation, plasterboard, timber and fixings can go on one delivery. See our timber range and the OSB vs plywood guide for roof decks and floors.

Do you deliver further afield?

Yes. For Bristol, Bath and Gloucester see our South West page, and for the North West see Manchester.

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