Rockwool Full Fill Cavity Batt 50mm is a high-performance stone wool insulation solution designed for full fill masonry cavity wall applications in residential and commercial construction projects. Engineered to provide excellent thermal, acoustic and fire protection performance, this durable cavity batt helps reduce heat loss, improve energy efficiency and minimise airborne sound transmission through external wall systems. Manufactured from non-combustible stone wool, the batt is water-repellent, breathable and designed to maintain long-term performance without sagging or shrinking over time. The semi-rigid construction allows for easy installation within masonry cavity walls, while tightly butted joints help achieve consistent insulation coverage and reduced thermal bridging. With excellent fire resistance and dependable durability, Rockwool Full Fill Cavity Batt 50mm is an ideal insulation solution for modern energy-efficient building envelopes.
Key Features:
High-performance stone wool cavity wall insulation batt
Designed for full fill masonry cavity wall applications
Excellent thermal, acoustic and fire protection properties
Helps reduce heat loss and improve energy efficiency
Euroclass A1 non-combustible fire rating
Water-repellent and breathable insulation material
Semi-rigid construction for easy installation
Helps minimise airborne sound transmission
Durable long-term performance without sagging
Suitable for residential and commercial construction
Technical Specifications:
Product type: Full fill cavity wall insulation batt
Brand: Rockwool
Range: Full Fill Cavity Batt
Thickness: 50mm
Batt size: 1200mm x 455mm
Coverage: 6.55m² per pack
Material: Stone wool insulation
Application: Masonry cavity wall insulation
Installation: Full fill cavity wall construction
Fire classification: Euroclass A1 non-combustible
Performance: Thermal, acoustic and fire insulation
Use: Residential and commercial construction projects
Please note: This product is available exclusively from our HPC Insulation store and may be subject to a longer lead time than standard stocked items.
TJ’s Tip:
When installing full fill cavity insulation, ensure all batt joints are tightly butted together and cavity wall ties are kept clean to maintain consistent thermal performance and proper moisture drainage.
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.
