Velux BDX MK12 2000F Insulation + BFX Underfelt Recessed Collar - 780mm x 1800mm
- Velux BDX MK12 2000F Insulation + BFX Underfelt Collar sized 780mm x 1800mm for standard roof window frames
- Flexible foam insulation prevents heat loss and cold bridging around your roof window
- Includes pleated underfelt collar for a watertight seal with your roof structure
- Quick and precise fit with click fittings for easy assembly on site
- Water drains safely via a self-supporting drainage gutter to protect roof integrity
The Velux BDX MK12 2000F Insulation combined with the BFX Underfelt Recessed Collar is designed for roofers, builders and loft converters needing a reliable, energy-efficient seal around roof windows. It reduces heat loss and prevents cold bridging, making it an excellent choice for re-roofing or new build projects. Please note that this product is sized 780mm x 1800mm to fit standard window frames.
Application
This insulation collar and underfelt combination is ideal for creating a weatherproof, airtight connection between your roof window and the surrounding roof structure. It works seamlessly with Velux EDL, EDP, EDW and EDZ flashings, helping to maintain thermal performance while safely managing water drainage. Whether you’re installing new windows or upgrading existing ones during extensions or loft conversions, this system ensures a clean, durable finish that stands up to UK weather conditions.
Dimension
- 780mm x 1800mm (30.7" x 70.9") – fits all standard Velux roof window sizes
Material
- Flexible insulating foam
- Durable, pleated underfelt collar material
Type
- Roof window insulation collar and underfelt flashing accessory
This product is supplied as shown and designed for use with compatible Velux flashings. It is a practical, trade-friendly solution that simplifies installation and enhances roof window performance in any pitched roof setup.
Delivery
Important: The following delivery information applies only to orders placed online.
Delivery Times
When placing your order, you will be able to view available delivery times at the checkout.
Please note: while we aim to deliver within 2–3 business days, this is subject to stock availability. A member of our team will be in touch after you place your order to confirm your delivery date.
Click & Collect is also available from selected branches. However, please be aware that stock levels can fluctuate, so we’ll confirm product availability and collection timing once your order is placed.
Delivery Charges
Orders over £150 ex VAT within our local delivery area qualify for free delivery. This excludes palletised or specialist products.
For orders under £150 ex VAT, standard delivery is £10 plus VAT. Certain products have specific delivery costs:
- Civil Engineering products: £20 + VAT.
- Roofing Tiles under £249.99 ex VAT: £60 + VAT.
Delivery charges and policies may vary at the discretion of our branches, and we reserve the right to amend them as required.
We offer a variety of delivery options to meet your needs nationwide, including pallet shipping (subject to size and weight restrictions), site delivery, and same-day or next-day delivery via TradeKart (available in selected postcodes).
Delivery charges are calculated based on your location, the products ordered, and your selected delivery method. Final costs will be displayed at checkout. If you have specific delivery requirements, please contact your local branch via our Branch Finder.
For any delivery-related enquiries, please email our sales team at websales@lordsbm.co.uk.
