Thermo-loc Platinum Plus is an advanced solution for eliminating damp and cold bridging around doors, windows, and sills. Engineered with versatility in mind, this cavity closer is designed to effectively close cavities at external doors, window jambs and sills, providing essential thermal insulation to prevent cold bridging. Suitable for cavities up to 150mm, Thermo-loc Platinum Plus excels in creating an efficient damp-proof course (DPC) and thermal barrier between the frame, inner and outer wall leaf.
Boasting a low thermal conductivity of 0.031W/m²k, Thermo-loc Platinum Plus exceeds the minimum thermal resistance path of 0.45m² K/W as mandated by accredited construction details. Its rigid profile extrusion in uPVC ensures durability and resistance to decay, while the platinum expanded polystyrene insulation further enhances its thermal performance. Available in 2.4m lengths, this closer caters to Multi 100mm, Multi 100mm CR and fixed cavities, allowing for versatile applications. With the added convenience of simple on-site trimming to accommodate varying cavity widths, Thermo-loc Platinum Plus stands as a reliable and environmentally conscious choice, with a global warming potential of less than five and zero ozone depletion potential.
Features & Benefits: Thermo-loc Platinum Plus 50mm Cavity Closer 2.4m - Pack of 10
- Reliable DPC and thermal barrier between frame, inner and outer wall leaf
- Thermal conductivity of 0.031W/m²k
- Exceeds the minimum thermal resistance path of 0.45m² K/W
- Rigid profile extrusion allows second fix
- Simple on-site trimming to cope with 'rogue' cavity widths
- Global Warming Potential of less than 5
- Ozone Depletion Potential of zero
Standards & Certification
- Manufactured to BS EN ISO 9001 and BS EN ISO 14001
- Complies with Building Regulation Approved Documents C, L1 and L2
- Satisfies BRE document 'Thermal insulation: avoiding risks'
- Meets all relevant British Standards
- Satisfies NHBC standards
Please note:
- Joining 'off cut' sections should be kept to a minimum and not carried out to sill sections.
- Insulation should be extended from the lower closer profile to allow this to slot into the upper profile to maintain a rigid section.
- All overlaps should be sealed with tape.
- Can be used in second fix applications.
- Collect from our Ashburnham Road store in Northampton.
- Local van delivery within 10 miles: £19.99 on orders of £100 or more.
- Trade customers: ask in store about a trade account.
🏪 Collect in-store — usually ready in 2-3 working days, 2 Ashburnham Road, Northampton.
UK delivery £3.99 — FREE on orders over £85. Orders are typically dispatched within 2-3 working days. We ship fully tracked with DX Delivery and Evri and email your tracking as soon as it ships. Full delivery information.
- 14 days to change your mind — return most items within 14 days of delivery, unused, in their original packaging and resaleable condition.
- Contact us first with your order number and we’ll send return instructions.
- Return postage is at your own cost — unless the item is faulty, damaged or incorrect.
- Faulty or incorrect item? Tell us within 30 days of delivery and we’ll arrange a replacement or refund at no extra cost.
- Refunds go back to your original payment method within 7 working days of inspection. Please note fireworks are strictly final-sale.


