Construction-focused silica-core vacuum insulation panel

SilthermVacuPanel XF

A finished fumed-silica vacuum panel for flat roofs and floors where the construction cannot accommodate a deep insulation build-up.

Two finished Siltherm VacuPanel XF panels showing the metallised foil envelope and slim panel edges
Declared lambda0.006 W/mK
Thickness options20, 25, 30, 40, 50 mm
Maximum panel size1200 x 600 mm
Compressive strength>150 kPa

Space-efficient thermal resistance

Reach the required thermal performance with less build-up.

VacuPanel XF combines a declared lambda of 0.006 W/mK with standard modules for depth-constrained roofs and floors.

01

Work within height restrictions

Concentrate thermal resistance in a slim insulation zone when planning or design constraints limit the available depth.

02

Maintain level threshold details

Coordinate a shallow build-up around access points while working toward the required U-value.

03

Plan with standard panel modules

Combine the available panel sizes with perimeter insulation and project-specific edge details.

Thermal resistance by thicknessDeclared values
20 mm3.30 m²K/W
30 mm5.00 m²K/W
40 mm6.65 m²K/W
50 mm8.30 m²K/W

Choose the panel thickness and layout as part of the complete roof or floor construction.

Application placement

Position the panel inside the protected construction.

VacuPanel XF is a finished vacuum panel installed within the insulation zone. The surrounding layers protect the metallised envelope and complete the roof or floor assembly.

VacuPanel XF position
Below the weatherproofing and protection layers, above the supporting roof deck.
01

Flat roof build-up

Use the finished panel in a protected insulation zone where roof depth is restricted.

Open building context
Below the floor finish and load-distribution layers, above the structural slab.
02

Floor build-up

Fit VacuPanel XF within a protected floor construction while preserving usable floor-to-ceiling height.

Within the restricted insulation zone adjoining the level threshold.
03

Level threshold detail

Use the slim panel build-up to coordinate access levels and thermal continuity around a shallow junction.

Conceptual sections. Panel layout, joints, perimeter insulation, protective layers and structural details are coordinated for the project.

Technical documentation

Product data for design and specification.

Technical documentation includes construction and reaction-to-fire information. Contact Siltherm for the documents and scope relevant to your project and location.

Controlled technical document

Siltherm VacuPanel XF

Siltherm VacuPanel XF Product Data Sheet / October 2025

Provide your professional details to request the current controlled copy. No project drawing or confidential design information is required.

Your request will be sent to the Siltherm team so a specialist can provide the current document and respond to relevant technical questions.

Document requests are temporarily unavailable.

Thermal CalculationEngineering support