Upgrade your floors with high-performance insulation that’s built for trades and DIY projects alike. The 100mm Underfloor PIR Insulation (Product Code: 127035) provides superior thermal efficiency, keeping heat where it belongs while helping reduce energy bills. Lightweight, rigid, and easy to handle, it’s perfect for timber or concrete floors in domestic builds and renovations.
Engineered for underfloor use, this PIR panel delivers consistent performance, easy cutting for custom layouts, and a strong, stable base that won’t sag or compress over time. Ideal for new builds or retrofit projects, it’s the go-to choice for tradespeople who demand reliability without compromise.
Key Features:
High Thermal Efficiency: Rigid PIR board offers excellent insulation performance, reducing heat loss and improving energy efficiency.
Durable & Lightweight: Strong, stable panels that are easy to cut and handle on-site.
Perfect Dimensions: 100mm thick x 2.4m long x 1.2m wide (8’ x 4’) — covers large areas quickly.
Easy Installation: Fits snugly between joists or under concrete screeds, ideal for both new builds and refurb projects.
Moisture Resistant: Closed-cell PIR structure resists damp, mold, and compression.
Technical Specifications:
Product Code: 127035
Dimensions: 100mm (thick) x 2.4m (L) x 1.2m (W)
Material: Rigid PIR Insulation
Application: Underfloor insulation for timber or concrete floors
Standards: Complies with current building regulations for thermal performance
TJ’s Tip:
For best results, cut panels carefully with a sharp insulation knife for a snug fit around joists and edges. Leave no gaps to ensure maximum efficiency and consider pairing with a vapour control layer for added protection against moisture.
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.
