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60mm X 2.4m X 1.2m Underfloor Pir Insulation (8' X 4') (Uf)
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XT/UF
The floor in any building is an area of considerable downward heat loss when not properly insulated. XT/UF will significantly improve the U-value of new and existing floors.
Thin-R Underfloor XT/UF is lightweight, easy to install and combines high compressive strength with low thermal conductivity, providing a high performance solution for floor insulation.
Typical U-Values
U-Value calculations to EN ISO:6946 for UK
XT/UF Insulation for Ground Supported Slab
Perimeter/Area Ratio 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 Target U-Value
Thickness (mm) 25 40 40 50 50 55 60 60 60 0.25
Thickness (mm) 30 50 60 60 70 70 70 70 70 0.22
Thickness (mm) 40 60 60 70 75 75 80 80 80 0.20
Thickness (mm) 70 90 100 110 110 110 120 120 120 0.15
Typical U-Values
U-Value calculations to EN ISO:6946 for ROI
XT/UF Insulation for Ground Supported Slab
Perimeter/Area Ratio 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 Target U-Value
Thickness (mm) 30 45 50 55 60 60 60 65 65 0.25
Thickness (mm) 40 55 60 65 70 70 75 75 75 0.22
Thickness (mm) 50 65 70 75 80 80 90 90 90 0.20
Thickness (mm) 80 100 110 110 120 120 120 125 125 0.15
U-Value calculations to EN ISO:6946 for UK
XT/UF Insulation for Beam & Block Suspended Floor
Perimeter/Area Ratio 0.5 0.6 0.7 0.8 0.9
Thickness
50mm 0.27 0.28 0.28 0.29 0.29
60mm 0.24 0.25 0.25 0.25 0.26
75mm 0.21 0.21 0.21 0.22 0.22
80mm 0.20 0.20 0.20 0.21 0.21
100mm 0.17 0.17 0.17 0.17 0.18
120mm 0.14 0.15 0.15 0.15 0.15
U-Value calculations to EN ISO:6946 for ROI
XT/UF Insulation for Suspended Hollow Core Floor
Perimeter/Area Ratio 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.00 Target U-Value
Thickness (mm) 40 50 50 60 60 60 60 60 60 0.25
Thickness (mm) 50 60 70 70 70 70 70 75 75 0.22
Thickness (mm) 60 70 75 75 80 80 80 80 90 0.20
Thickness (mm) 90 100 110 110 120 120 120 120 120 0.15
Key Points
High Compressive Strength
Suitable for Underfloor Heating
Perimeter Strips for Robust Detailing
Reduced Insulation Thickness
| Brand | Xtratherm |
|---|---|
| Weight | 1.0000 |
| Provided by | TJ O'Mahony |
| Delivery Rule | large & heavy |
Last update: 17 August 2026
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 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 |
*Standard delivery policy. Promotional delivery rates may apply during campaigns.
30-Day Returns
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.
