Rockwool RWA45 Slab 100mm is a premium semi-rigid stone wool insulation slab designed to deliver outstanding acoustic, thermal and fire protection performance across a wide range of internal building applications. Manufactured with a density of 45kg/m³, this high-performance insulation slab is ideal for internal partitions, stud walls, ceilings, floors and general building insulation where effective sound absorption and thermal efficiency are essential. The durable stone wool construction helps reduce airborne sound transmission, improve energy efficiency and enhance passive fire protection in residential, commercial and industrial buildings. Easy to cut, handle and install, Rockwool RWA45 slabs maintain their shape over time without sagging or shrinking, ensuring reliable long-term insulation performance. With excellent acoustic absorption properties and a Euroclass A1 non-combustible fire rating, Rockwool RWA45 100mm is a dependable insulation solution for modern construction systems.
Key Features:
Semi-rigid stone wool insulation slab
45kg/m³ density for effective acoustic performance
Excellent thermal, acoustic and fire protection properties
Suitable for partitions, floors, ceilings and stud walls
Helps reduce airborne sound transmission
Euroclass A1 non-combustible fire rating
Durable, water-repellent and long-lasting performance
Easy to cut and install on site
Suitable for residential, commercial and industrial applications
Maintains shape without sagging or shrinking over time
Technical Specifications:
Product type: Semi-rigid stone wool insulation slab
Brand: Rockwool
Range: RWA45
Density: 45kg/m³
Thickness: 100mm
Slab size: 1200mm x 600mm
Coverage: 2.88m² per pack
Material: Stone wool insulation
Pack Weight: 12.96Kg
Application: Acoustic, thermal and fire insulation systems
Installation: Friction-fit or mechanically fixed depending on application
Fire classification: Euroclass A1 non-combustible
Use: Residential, commercial and industrial construction
Please Note:
This product is available mainly from our HPC Insulation store and may be subject to a longer lead time than standard stocked items.
For improved acoustic insulation performance, ensure slabs fully fill the cavity depth and fit tightly around services and junctions to help minimise airborne sound leakage.
We offer reliable delivery services throughout the Republic of Ireland, with straightforward delivery charges for both trade and DIY customers. Delivery options are confirmed at checkout based on your order and delivery Eircode.
Delivery Charges & Delivery Times
Delivery Type
Delivery Area
Delivery Charge
Delivery Time
Small Items
Republic of Ireland
€9.99
3–4 working days
Large & Heavy*
Standard delivery area
€29.99
5–7 working days
Extra Large*
Standard delivery area
€50.00
5–7 working days
Paint 5L or less**
Standard delivery area
€19.99
5–7 working days
Swipe sideways to compare delivery options.
Small Items
Delivery area
Republic of Ireland
Charge
€9.99
Delivery time
3–4 working days
Large & Heavy*
Delivery area
Standard delivery area
Charge
€29.99
Delivery time
5–7 working days
Extra Large*
Delivery area
Standard delivery area
Charge
€50.00
Delivery time
5–7 working days
Paint 5L or less**
Delivery area
Standard delivery area
Charge
€19.99
Delivery time
5–7 working days
*Standard delivery policy. Promotional delivery rates may apply during campaigns.
Additional Information
FREE delivery on eligible Small Items and Large & Heavy orders over €1,499, within the standard delivery area only.
Special Order and Catalogue Products require an additional 5 working days.
FREE collection of old appliances is available through WEEE Ireland when purchasing qualifying large appliances.
FREE Click & Collect is available for items in stock at your selected branch.
Large & Heavy and Extra Large items are available within our standard delivery area only.
Paint delivery Paint in tin cans 5L or less is available for delivery. Larger sizes and paint supplied in plastic buckets are available for Click & Collect only.
TJ O'Mahony offers a 30-day returns policy on eligible unused products, giving you additional time beyond the statutory 14-day cooling-off period applicable to most online consumer purchases.
Eligible products can be returned for a refund or exchange within 30 days of delivery or collection, provided they are unused, in their original and re-saleable condition, complete with all supplied parts and accessories, and accompanied by proof of purchase.
Please note: Return restrictions apply to certain products, including Mixed Paint, certain Bagged Building Products, Solid Fuel, Special Order, Non-Stock and Catalogued Products.
Your statutory rights in relation to faulty, damaged, incorrectly supplied or non-conforming goods are not affected.
