Envelope and protection · Insulation
Vacuum Insulation Panel
Explains why a sealed evacuated panel is ordered to a setting-out drawing before the opening exists, and why every site habit that suits a board has to be unlearned for it.
Educational reference entry. Suitability depends on the complete assembly, substrate, exposure, installation method, manufacturer documentation, local requirements and qualified professional review.
Overview
What vacuum insulation panel is
A vacuum insulation panel is a rigid micro-porous core — most often a fumed or precipitated silica compact — sealed inside a multi-layer gas-tight film and evacuated. The insulating effect comes from the absence of gas inside the envelope, not from the core alone. Everything that makes the panel what it is therefore depends on that envelope staying intact, which is a very different proposition from every other insulation in the library.
It cannot be cut, drilled, trimmed, nailed through or pierced. A panel that is breached becomes an ordinary and much less effective core, and there is no way to repair it on site. Panels are consequently made to a schedule of sizes before the work exists, delivered to that schedule, and laid to a setting-out drawing rather than fitted to what is found. Many are supplied already faced, framed at the edges, or laminated into a protective board so that the vulnerable film is not handled directly.
That constraint shapes the whole job around it. The layout has to be drawn before ordering; fixings, service runs and later penetrations have to be planned out of the panel zone; edges and perimeters behave differently from the middle of a panel and are commonly filled with a conventional insulation; and a delivery has to be inspected and accepted before anything is built over it, because a damaged panel discovered later cannot be swapped without taking the construction apart.
Terminology
Common names and aliases
These names describe the same thing. The library keeps one entry per material so that an acronym, a trade name or a regional spelling never becomes a second, thinner page.
- VIP insulation panel
- Evacuated core insulation panel
- Vacuum panel insulation
- Micro-porous core vacuum panel
Applications
Common applications
Where this material is typically encountered. A typical application is not a statement that it suits your project.
- Floor build-ups in refurbishment work where the finished floor level cannot be raised.
- Terrace and balcony build-ups where threshold levels are fixed by the existing doors.
- Internal linings in rooms whose proportions, joinery or cornices cannot give up the depth.
- Reveals, thresholds and junction details where a professional has designed the layout panel by panel.
- Prefabricated elements and factory-made assemblies where the panels are enclosed under controlled conditions.
- Narrow service voids and riser walls where nothing thicker can physically be fitted.
Consideration
Where it is commonly considered
- Where the depth available is genuinely fixed and conventional boards and quilts have already been ruled out.
- Where the layout can be drawn and the panels ordered to that drawing before work starts.
- Where the construction can be designed so nothing is ever fixed through the panel zone.
- Where the site can receive, inspect, store and lay panels without piercing or bending them.
- Where a qualified professional has designed the whole build-up, including the perimeters and the edge conditions.
Professional review
Where additional professional review is especially important
These are the situations where the answer depends on the specific building, and where a qualified professional should be involved before anything is decided.
- Anywhere the panels would have to be trimmed or adjusted on site to suit what is found.
- Where future fixings, services or penetrations through the layer cannot be ruled out and recorded.
- Where the construction over the panels is not designed to protect them from point loads and site traffic.
- Where the moisture behaviour of the build-up, and of any existing construction, has not been assessed.
- Where the programme cannot absorb the lead time of a made-to-schedule product ordered before the opening exists.
Properties
Key properties to discuss
Qualitative topics worth raising. Measured values, classes and grades come from the manufacturer's technical documentation for the specific product, not from a reference page.
- Thermal behaviour
- The thermal behaviour depends on the envelope being intact, which is the entire subject. No value is stated here; figures belong to the manufacturer's documentation for the exact panel and to a calculation for the actual detail, prepared by someone who has allowed for the perimeters.
- Installation dependency
- Panels are laid to a setting-out drawing and never adjusted to fit. Handling, the order of laying, protection during laying and the rule that nothing is driven through the zone are the installation subjects.
- Substrate dependency
- What the panels are laid on has to be clean, flat and free of anything that could point-load or pierce the film. Substrate preparation is more critical here than for any board that can take a knock.
- Repairability
- There is no repair. A breached panel is identified and replaced, which means it has to be found before it is covered, and that makes inspection and acceptance on delivery and on laying a real part of the job.
- Documentation
- Ask for the panel schedule against the setting-out drawing, the manufacturer's handling, laying and protection guidance, and a clear statement of how damaged panels are identified, reported and replaced.
- Fire-related questions
- No fire characteristic or comparison is stated here. Fire behaviour belongs to the complete build-up including the facings, protective boards and linings, and is a matter for the manufacturer's documentation, a qualified professional and the relevant authority.
- Moisture behaviour
- The envelope is a sealed film within the construction, so how the build-up around it manages moisture, and how the perimeters are made up, are questions for the professional who designed the assembly rather than properties of the panel.
Exposure
Exposure and environmental conditions
- Whether the position can be kept dry, protected and free of traffic between delivery and covering.
- How the existing construction behaves in moisture terms, particularly where panels are used as an internal lining.
- Whether the panels will be handled outdoors, and what protects them from weather and site damage.
- How the construction over the panels distributes load so that nothing point-loads the film.
- Whether any future work in this area — flooring, services, fixings — is foreseeable and has been designed out.
Assembly
Substrate and system dependencies
What this material sits on, is fixed to or depends on. This is usually where performance is won or lost.
- A clean, flat, debris-free surface to lay onto, prepared and checked before delivery.
- The setting-out drawing the panel schedule was ordered from, and whether the work as built still matches it.
- The protective board, facing or edge frame the manufacturer supplies or requires around the panels.
- How the perimeters and any non-modular areas are made up, usually with a conventional insulation.
- How the layer is terminated at thresholds, upstands, reveals and penetrations, all of which are drawn rather than improvised.
Appearance
Appearance and finish considerations
- The panels are always covered in service, so the visible result belongs to the floor, lining or finish above them.
- Because so little depth is used, existing thresholds, reveals, skirtings and joinery can often stay as they are, which is usually the reason for choosing them.
- The finish over the panels needs a proper base, commonly a protective board, and that base is a design decision rather than a site one.
- A setting-out drawing made for panels has to be reconciled with the setting-out of the finish above, and the two are easily drawn independently.
Durability
Durability questions
Questions to raise rather than a service life to expect. No material has a universal lifespan — it depends on the assembly, the exposure and the upkeep.
- How the construction over the panels protects them from point loads over the life of the building.
- What would happen if a panel were breached after being covered, and how that would be noticed.
- Whether anything is likely to be fixed through this zone later, and what record warns against it.
- How the perimeters and edge make-up areas behave compared with the panelled zone.
- How movement in the surrounding structure has been allowed for around a rigid, unadjustable layer.
Upkeep
Maintenance and repair considerations
- What would have to be lifted to reach the layer, and what that means for the finish above it.
- Whether panels of the same schedule could still be obtained if one had to be replaced.
- How a replacement would be identified, ordered and laid into an existing layout.
- What record exists of the panel layout, so that later work does not drill into it.
- Who would be asked to assess a build-up where a panel is suspected of having been damaged.
Installation
Installation dependencies
What the installation depends on — not how to do it. Method belongs to the manufacturer's instructions and the trades carrying out the work.
- A setting-out drawing produced and agreed before panels are ordered, since they cannot be adjusted afterwards.
- Delivery inspection and acceptance, because a damaged panel has to be found before anything is built over it.
- Storage and handling that keeps the film away from tools, fixings, grit and site traffic.
- Laying to the drawing, with the perimeters made up as designed rather than by trimming panels.
- A protective layer over the panels before any following trade works on the area.
- A site rule, agreed and communicated, that nothing is driven through the panel zone at any stage.
Documentation
Documentation to request
Ask for these in writing, for the specific product being proposed, and keep them with the project record.
- The panel schedule and the setting-out drawing it was produced from.
- The technical data sheet for the exact panel type, facing and edge treatment supplied.
- Manufacturer guidance on handling, laying, protection and on identifying a damaged panel.
- Guidance on how perimeters and non-modular areas are intended to be made up.
- A record of the as-laid layout, kept with the building's information for future work.
Conversations
Questions for qualified professionals
Bring these to the relevant qualified professional, manufacturer or authority. Requirements vary by project and location.
- What is the fixed depth constraint that makes an unadjustable panel the answer here?
- Who is producing the setting-out drawing, and when does the panel schedule have to be ordered from it?
- How are the perimeters and any non-modular areas being made up?
- What protects the panels between delivery and covering, and who is responsible on site?
- How is a damaged panel identified and reported before it is built over?
- What stops anything being fixed through this zone, now or in later work?
- How has the moisture behaviour of the whole build-up been assessed around a sealed layer?
- Which parts of this build-up need confirming against local requirements, and who is confirming them?
Blind spots
Commonly overlooked points
- It cannot be cut, and every ordinary site habit for fitting a board has to be unlearned for it.
- The panels are ordered from a drawing before the opening exists, which puts the design decision much earlier than usual.
- The perimeter of a panelled area is not the same construction as the middle of it, and the make-up there is a design decision.
- A damaged panel found after covering is a construction problem rather than a materials one.
- A record of the layout is what stops someone drilling into the zone years later, and it is rarely kept.
What this page does not do
- This entry states no thermal value and makes no claim about energy outcomes.
- No fire characteristic or comparison is given here; fire behaviour belongs to the complete build-up and is a matter for a qualified professional and the relevant authority.
- Build Design Hub does not test, approve, certify, specify or recommend any vacuum panel, facing, protective board or build-up.
Inspiration
Related Ideas Library pages
Design directions where this material commonly appears.
Preparation
Related planning checklists
Owner-side preparation before the conversation where this material comes up.
Go deeper
Related Build Design Hub guides
Planning guidance and neutral comparisons behind the decisions on this page.
Insulation Materials
Reference entries for thermal insulation materials — mineral and glass wool, rigid foam boards, natural-fibre insulations, blown and sprayed products and reflective systems.
Browse all insulation entries →