Skip to content

Insulation
- All Insulation
- Loft & Underfloor Insulation
  
  Loft & Underfloor Insulation
  Loft Legs
- Glass Wool and Mineral Wool
  
  Glass Wool and Mineral Wool
  Glass Wool
  Mineral Wool
  Glass Mineral Wool
- Aerogel
  
  Spacetherm®
- Foam Glass
  
  Foam Glass Aggregate
  Foam Glass Slabs
- Recycled Insulation
  
  SupaSoft
- Rigid Insulation Boards
  
  PIR Board
  Phenolic Foam Boards
  Polystyrene
- More
  
  Technical Insulation
  Fire Rated Insulation
  Clearance
Natural Insulation
- All Natural Insulation
  
  Wood Fibre Insulation
  Hemp Insulation
  Sheep's Wool
  Wood Wool Boards
  Sustainable Building
- Wood Fibre Insulation
  
  Wood Fibre Flexi Insulation
  Wood Fibre Rigid Insulation
- Sheep's Wool
  
  Sheep's Wool Roll Insulation
  Sheep's Wool Slab Insulation
STEICO

Saves CO2, Stores CO2
Shop STEICO

Insulate naturally, with wood fibre

IndiNature

Hemp insulation, grown and made in Great Britain.
Shop IndiNature
Airtightness
- All Airtight
  
  Airtight Membranes
  Airtight Tapes and Sealants
  Expanding Tapes
  Airtight Grommets
  Liquid Airtight Membranes
- Pro Clima
  
  All Pro Clima
  Pro Clima Tapes
  Pro Clima Membranes
  Pro Clima Sealants & Adhesives
  Pro Clima Pipe & Cable Grommets
- SIGA
  
  All SIGA
  SIGA Inside
  SIGA Outside
  SIGA Tapes
  SIGA Membranes
Pro Clima

Innovative ideas for tomorrow's buildings.
Shop Pro Clima

SIGA

We strive for a world of zero energy loss buildings
Shop SIGA
Building Boards
- All Building Boards
  
  Wood Wool Boards
  Calcium Silicate Boards
  Cement Boards
  Fire Protection Boards
  Render Carrier Boards
  PVC Wall Panels
CEWOOD

Wood wool boards made from 100% natural materials
Shop CEWOOD

Perfect natural plasterboard replacement
Membranes
- All Roofing & Membranes
  
  Airtight & Windtight Membranes
  Breather Membranes for use externally
  Vapour Control Layer (VCL) for use internally
  Roofing Underlay Membranes
  Timber Frame Membranes
  DPM (Damp Proof Membrane) Polythene Membranes
Vapour Control Layers

Shop our range of Vapour Control Layers (VCL).
Shop now

For use internally

Breather Membranes

Shop our range of Breather Membranes.
Shop now

For use externally
Renders & Plasters
- All Renders & Plasters
  
  Plasters
  Renders
  Render & Plaster Primers and Sealers
  Render & Plaster Base Coats
  Mortars & Adhesives
  Hydraulic Lime
  Fillers
Adaptavate

Carbon-negative internal plasters.
Shop now

Baumit PremiumPrimer

Internal surface prep prior to plastering.
View product

20kg
Fixings & Accessories
- Screw & Fixings
  
  All Screws
  Insulation Fixings
  Flat Roof Fixings
  Drywall Screws
  Timber Screws
  Metal Screws
  Washers
  Fixing Accessories
- Accessories
  
  All Accessories
  Tools
  Temporary Surface Protection Films
  Adhesives, Sealants & Tapes
  Insulation Netting
  Loft Leg
  Loft Ladders & Hatches
  Metal Studs & Channels
Insulation Fixings

Shop our range of insulation fixings for Flat Roofs.
Shop now

Insulation Saws

BAHCO Insulation saws are perfect for cutting natural fibre insulation.
Cut now!

Saws & Sharpeners
Clearance
Shop by brand
Contact Us
Glossary

Guernsey (GBP £)
Ireland (EUR €)
Isle of Man (GBP £)
Jersey (GBP £)
United Kingdom (GBP £)

No account yet? Create Account

Facebook
Pinterest
Instagram
LinkedIn

What are You looking for ...

Airtight & Windtight Systems
Natural Insulation
Hemp Insulation
Wood Fibre Insulation
Wood Wool Boards
Renders, Plasters & Mortars

60mm Pro Clima Tescon Vana - Airtight Tape (30m)
LOFT LEG XL Loft Flooring Legs - Raise Loft Boards by 300mm (12 per box)

Cant find something?

We are here to help.

Shop by brand
Contact Us
Glossary
Blogs

Guernsey (GBP £)
Ireland (EUR €)
Isle of Man (GBP £)
Jersey (GBP £)
United Kingdom (GBP £)

Log in Create Account

Insulation
Insulation
Natural Insulation
Natural Insulation
STEICO

Saves CO2, Stores CO2
Shop STEICO

Insulate naturally, with wood fibre

IndiNature

Hemp insulation, grown and made in Great Britain.
Shop IndiNature
Airtightness
Airtight & Windtight solutions
Pro Clima

Innovative ideas for tomorrow's buildings.
Shop Pro Clima

SIGA

We strive for a world of zero energy loss buildings
Shop SIGA
Building Boards
Building Boards
- All Building Boards
CEWOOD

Wood wool boards made from 100% natural materials
Shop CEWOOD

Perfect natural plasterboard replacement
Membranes
Membranes
- All Roofing & Membranes
Vapour Control Layers

Shop our range of Vapour Control Layers (VCL).
Shop now

For use internally

Breather Membranes

Shop our range of Breather Membranes.
Shop now

For use externally
Renders & Plasters
Renders & Plasters
- All Renders & Plasters
Adaptavate

Carbon-negative internal plasters.
Shop now

Baumit PremiumPrimer

Internal surface prep prior to plastering.
View product

20kg
Fixings & Accessories
Screws, Fixings & Accessories
- Screw & Fixings
- Accessories
Insulation Fixings

Shop our range of insulation fixings for Flat Roofs.
Shop now

Insulation Saws

BAHCO Insulation saws are perfect for cutting natural fibre insulation.
Cut now!

Saws & Sharpeners
Clearance

Order helpline:

01786 657 911 | Open Mon-Fri 7.30am-5pm

Wherever possible, we will Price Match.

Interested in a Trade Account?

Hold stock of most product lines.

Mineral Wool

Collection: Mineral Wool

65mm Rockwool TCB Cavity Barrier (50-55 cavity) - per length | Insulation Merchant

Clear all filters

Showing 72 of 72 products

Sort by:

Brand

Knauf Insulation (5)
Rockwool (67)

Sub-Brand

Ablative Batt (1)
Acoustic Roll (4)
Acoustic Slab - RWA45 (1)
Beamclad (3)
Ductwrap & Ductslab (1)
Fire Barrier (3)
Fire Barrier EN (1)
Flexi (4)
FLEXI (2)
Full Fill Cavity Batts (5)
Hard Rock (1)
Hardrock (1)
Intumescent Batt (1)
NyRock Rainscreen (1)
ProRox (3)
ProRox WRG (1)
Rainscreen Duo (5)
Rocksilk® RS45 (1)
RW3 (8)
RW5 (5)
RWA 45 (6)
TCB Cavity Barrier (14)

Product type

Cavity Barrier (3)
Fire (9)
Glass and Mineral Wool (42)
Glass Mineral Insulation (4)
Insulation (1)
Mineral Wool (1)
Rock Wool (11)
Technical Insulation (1)

Thickness

100mm (2.16m² / 3 per pack) (1)
100mm (5 per pack - 3.60m²) (1)
110mm (2.16m² / 3 per pack) (1)
150mm (3 per pack - 2.16m²) (1)
200mm (1.44m² / 2 per pack) (1)
25mm (20 per pack - 14.40m²) (1)
30mm (2/500mm x 6m) (1)
50mm (10 per pack - 7.2m²) (1)
50mm (2/500mm x 3.1m) (1)
60mm (4.32m² / 6 p/pk) (1)
60mm (4.32m² / 6 per pack) (1)
75mm (6 per pack - 4.32m²) (1)
80mm (2.88m² / 4 per pack) (1)
90mm (2.88m² / 4 per pack) (1)

Thermal Conductivity (Product)

0.034 (7)
0.035 (3)
0.037 (5)
0.038 (16)
0.039 (1)
0.040 (2)

Thermal Conductivity (Variant)

0.032 (1)
0.034 (1)
0.035 (2)
0.040 (1)
0.32 (1)

Filter and sort

Filter and sort

Showing 72 of 72 products

Brand

Knauf Insulation (5)
Rockwool (67)

Clear

Sub-Brand

Ablative Batt (1)
Acoustic Roll (4)
Acoustic Slab - RWA45 (1)
Beamclad (3)
Ductwrap & Ductslab (1)
Fire Barrier (3)
Fire Barrier EN (1)
Flexi (4)
FLEXI (2)
Full Fill Cavity Batts (5)
Hard Rock (1)
Hardrock (1)
Intumescent Batt (1)
NyRock Rainscreen (1)
ProRox (3)
ProRox WRG (1)
Rainscreen Duo (5)
Rocksilk® RS45 (1)
RW3 (8)
RW5 (5)
RWA 45 (6)
TCB Cavity Barrier (14)

Clear

Product type

Cavity Barrier (3)
Fire (9)
Glass and Mineral Wool (42)
Glass Mineral Insulation (4)
Insulation (1)
Mineral Wool (1)
Rock Wool (11)
Technical Insulation (1)

Clear

Thickness

100mm (2.16m² / 3 per pack) (1)
100mm (5 per pack - 3.60m²) (1)
110mm (2.16m² / 3 per pack) (1)
150mm (3 per pack - 2.16m²) (1)
200mm (1.44m² / 2 per pack) (1)
25mm (20 per pack - 14.40m²) (1)
30mm (2/500mm x 6m) (1)
50mm (10 per pack - 7.2m²) (1)
50mm (2/500mm x 3.1m) (1)
60mm (4.32m² / 6 p/pk) (1)
60mm (4.32m² / 6 per pack) (1)
75mm (6 per pack - 4.32m²) (1)
80mm (2.88m² / 4 per pack) (1)
90mm (2.88m² / 4 per pack) (1)

Clear

Thermal Conductivity (Product)

0.034 (7)
0.035 (3)
0.037 (5)
0.038 (16)
0.039 (1)
0.040 (2)

Clear

Thermal Conductivity (Variant)

0.032 (1)
0.034 (1)
0.035 (2)
0.040 (1)
0.32 (1)

Clear

Sort by:

Clear all filters

Clear all filters

Showing 72 of 72 products

50mm Rockwool FLEXI Slab (600mm wide)

FLEXI by ROCKWOOL®
50mm Rockwool FLEXI Slab (600mm wide)

€ Looking for a price?

Add to a quote for our best rate.
50mm Rockwool Ductwrap

DUCTWRAP & DUCTSLAB by ROCKWOOL®
50mm Rockwool Ductwrap

Regular price

€81,95 EUR ex. GB VAT

Unit Price

€13,65 per m²

Sale price

€81,95 EUR ex. GB VAT

Unit Price

€13,65 per m²

Regular price

Save €-81,95

Unit price

per
50mm Rockwool Ablative Coated Batt

ABLATIVE BATT by ROCKWOOL®
50mm Rockwool Ablative Coated Batt

Regular price

€22,95 EUR ex. GB VAT

Unit Price

€31,88 per m²

Sale price

€22,95 EUR ex. GB VAT

Unit Price

€31,88 per m²

Regular price

Save €-22,95

Unit price

per
160mm Rockwool TCB Cavity Barrier (141-150 cavity) - pack of 7

TCB CAVITY BARRIER by ROCKWOOL®
160mm Rockwool TCB Cavity Barrier (141-150 cavity) - pack of 7

Regular price

€137,95 EUR ex. GB VAT

Unit Price

€16,42 per LM (linear metre)

Sale price

€137,95 EUR ex. GB VAT

Unit Price

€16,42 per LM (linear metre)

Regular price

Save €-137,95

Unit price

per
75mm Rockwool Rainscreen Duo

RAINSCREEN DUO by ROCKWOOL®
75mm Rockwool Rainscreen Duo

Regular price

€96,95 EUR ex. GB VAT

Unit Price

€22,44 per m²

Sale price

€96,95 EUR ex. GB VAT

Unit Price

€22,44 per m²

Regular price

Save €-96,95

Unit price

per
30mm Rockwool RWA45 Acoustic Thermal Insulation Slabs - 600mm x 1200mm

RWA 45 by ROCKWOOL®
30mm Rockwool RWA45 Acoustic Thermal Insulation Slabs - 600mm x 1200mm

Regular price

€33,95 EUR ex. GB VAT

Sale price

€33,95 EUR ex. GB VAT

Regular price

Save €-33,95

Unit price

per
100mm Rockwool RW3

RW3 by ROCKWOOL®
100mm Rockwool RW3

€ Looking for a price?

Add to a quote for our best rate.
200mm Rockwool Rainscreen Duo

RAINSCREEN DUO by ROCKWOOL®
200mm Rockwool Rainscreen Duo

Regular price

€120,95 EUR ex. GB VAT

Unit Price

€83,99 per m²

Sale price

€120,95 EUR ex. GB VAT

Unit Price

€83,99 per m²

Regular price

Save €-120,95

Unit price

per
50mm Rockwool RW5

RW5 by ROCKWOOL®
50mm Rockwool RW5

€ Looking for a price?

Add to a quote for our best rate.
50mm Rockwool Wire Reinforced Fire Barrier (Foil Faced 1 Sides) - 4m x 1m

5.0
1 reviews

FIRE BARRIER by ROCKWOOL®
50mm Rockwool Wire Reinforced Fire Barrier (Foil Faced 1 Sides) - 4m x 1m

€ Looking for a price?

Add to a quote for our best rate.
50mm Rockwool ProRox WM 971 UK WRG Wire Reinforced Mat (2x500mm x 3.1m)

PROROX WRG by ROCKWOOL®
50mm Rockwool ProRox WM 971 UK WRG Wire Reinforced Mat (2x500mm x 3.1m)

Regular price

€142,95 EUR ex. GB VAT

Unit Price

€46,11 per m²

Sale price

€142,95 EUR ex. GB VAT

Unit Price

€46,11 per m²

Regular price

Save €-142,95

Unit price

per
90mm Rockwool TCB Cavity Barrier (76-80 cavity) - per length

TCB CAVITY BARRIER by ROCKWOOL®
90mm Rockwool TCB Cavity Barrier (76-80 cavity) - per length

Regular price

€7,95 EUR ex. GB VAT

Unit Price

€6,63 per LM (linear metre)

Sale price

€7,95 EUR ex. GB VAT

Unit Price

€6,63 per LM (linear metre)

Regular price

Save €-7,95

Unit price

per
25mm Rockwool RW3

RW3 by ROCKWOOL®
25mm Rockwool RW3

€ Looking for a price?

Add to a quote for our best rate.
140mm Rockwool FLEXI Slab (600mm wide)

FLEXI by ROCKWOOL®
140mm Rockwool FLEXI Slab (600mm wide)

€ Looking for a price?

Add to a quote for our best rate.
185mm Rockwool Hardrock Multi-Fix (DD) - 1200mm x 1000mm Per Board (Has MOQ)

HARDROCK by ROCKWOOL®
185mm Rockwool Hardrock Multi-Fix (DD) - 1200mm x 1000mm Per Board (Has MOQ)

€ Looking for a price?

Add to a quote for our best rate.
40mm Rockwool Beamclad (2m x 1.2m) - per board

BEAMCLAD by ROCKWOOL®
40mm Rockwool Beamclad (2m x 1.2m) - per board

€ Looking for a price?

Add to a quote for our best rate.
50mm Rockwool FLEXI Slab (400mm wide)

FLEXI by ROCKWOOL®
50mm Rockwool FLEXI Slab (400mm wide)

€ Looking for a price?

Add to a quote for our best rate.
100mm Rockwool RW5

RW5 by ROCKWOOL®
100mm Rockwool RW5

Regular price

€42,95 EUR ex. GB VAT

Unit Price

€29,83 per m²

Sale price

€42,95 EUR ex. GB VAT

Unit Price

€29,83 per m²

Regular price

Save €-42,95

Unit price

per
Knauf Rocksilk® RS45 Slab Rock Mineral Wool

ROCKSILK® RS45 by Knauf Insulation
Knauf Rocksilk® RS45 Slab Rock Mineral Wool

€ Looking for a price?

Add to a quote for our best rate.
205mm Rockwool TCB Cavity Barrier (85-190mm cavity) - per length

TCB CAVITY BARRIER by ROCKWOOL®
205mm Rockwool TCB Cavity Barrier (85-190mm cavity) - per length

Regular price

€31,95 EUR ex. GB VAT

Unit Price

€26,63 per LM (linear metre)

Sale price

€31,95 EUR ex. GB VAT

Unit Price

€26,63 per LM (linear metre)

Regular price

Save €-31,95

Unit price

per

1
2
3
4

Account

My Account
Register for an Account
My Quote

Account

My Account
Register for an Account
My Quote

Support

Blogs
Contact Us & Support
Glossary & Technical terms
Shop by Brand
£ Price Changes

Support

Blogs
Contact Us & Support
Glossary & Technical terms
Shop by Brand
£ Price Changes

Policies

Shipping & Returns Policy
Privacy Policy
Terms of Service

Policies

Shipping & Returns Policy
Privacy Policy
Terms of Service

Call us

We're open 7.30am to 5pm

Monday to Friday

Ultimate Insulation Supplies Ltd

Unit 3 24 Munro Road

Springkerse Industrial Estate

Stirling FK7 7UU

what3words: ///radiates.webcams.dramatic

Currency

Guernsey (GBP £)
Ireland (EUR €)
Isle of Man (GBP £)
Jersey (GBP £)
United Kingdom (GBP £)

We accept:

Follow Us:

Facebook
Pinterest
Instagram
LinkedIn

Don't miss out!

E-mail

© Copyright 2025 Ultimate Insulation Supplies Ltd trading as Insulation Merchant | All Rights Reserved. Registered in Scotland SC427626 | VAT Registration No. 138 3712 12 | Developed in-house by the Ultimate Group.
Insulation_Merchant_V2.0.9

Cart

0 items

Your Cart is Empty

Loading...

Subtotal:

€0,00

VAT included. Shipping calculated at checkout.

Go to Cart

Choosing a selection results in a full page refresh.

My Quote (0)