What Cladding Can Be Used with SIPs and How Are SIPs Finished Internally?

Almost any conventional cladding can be used with SIPs, and internally SIP walls are typically finished with plasterboard, usually with a service void for cables. One of the biggest advantages of Structural Insulated Panels (SIPs) is the freedom they give you over how the finished building looks. The panels provide the structure and insulation, so the façade is a design choice, not a constraint.

At SIPS Eco Panels, we have standard construction details showing how a range of external and internal finishes can be incorporated into a SIPs building. This guide answers the questions self-builders and architects ask most often, starting with the outside.

What cladding can be used with SIPs?

Virtually any conventional cladding can be used with a SIPs structure, provided the façade system, cavity, fixings and ventilation are correctly designed for the project. Because the SIP panels carry the structural load and provide the insulation, external finishes only need to support themselves. Common SIPs cladding options include:

Cladding | How it works with SIPs

Brick – Forms a traditional outer leaf, tied back to the SIP structure across a cavity
Render – Applied over a suitable render board or carrier system, not directly onto the panel
Timber – Fixed to battens over a breather membrane, leaving a ventilated gap
Fibre cement – Fixed to a batten system as a durable, low-maintenance rainscreen
Metal – Zinc, aluminium and steel systems fixed to a batten or rail system
Stone or brick slips – Lightweight slip systems that give a masonry look without full masonry loads
Composite – Fixed on battens, popular for low-maintenance timber-effect finishes
Rainscreen systems – Ventilated façade systems in a wide range of materials

Whichever you choose, the principles are the same. The SIP is wrapped in a breathable membrane, and the cladding is fixed through it to timber battens attached to the panel. That leaves a ventilated cavity that lets moisture drain and dry out. Your design team will specify fixings, cavity depth and detailing for your chosen system, and we can supply the standard details to work from.

Can you use brick with SIPs?

Yes, and it’s one of the most popular choices for homes that need to match a local vernacular or planning requirement. The SIP system forms the insulated, structural envelope, and the brick outer leaf is built in front of it across a cavity, tied back with wall ties fixed to the SIP structure. The finished house looks like any traditional brick-built home, with the thermal performance of a SIPs envelope behind it.

Full brick and stone are heavier than lightweight claddings, so they need to be supported by suitably designed foundations. Brick and stone slips are a lighter alternative where you want the look without the loads.
Can SIPs be rendered?

Yes. Render is a common finish on SIPs homes, but it is applied as part of a proper external build-up, not directly to the panel. In practice that means a suitable render board or carrier system fixed to battens, with the correct membrane and cavity behind it. The specification depends on the render system you choose, so it’s worth confirming this with your architect and render supplier early.

Can you use timber cladding with SIPs?

Yes. Timber is one of the most popular finishes for SIPs, particularly on contemporary homes, rural projects and extensions. Larch, cedar, thermally modified timber and composite alternatives are all fixed to battens over the breather membrane. The ventilated gap behind the boards helps the cladding stay dry and last longer, and it allows any moisture to escape.

Timber can also be combined with other materials. A mix of brick, render and timber on the same SIPs building is common and works well.

Do SIPs limit the design of a building?

No. Choosing SIPs does not mean choosing a particular architectural style. The structural system sits behind the finished façade, giving architects and homeowners considerable freedom over the final appearance. SIPs are used for traditional brick-clad family homes, contemporary timber-clad builds, glazed gables, vaulted ceilings and room-in-roof designs, and often the only sign that a house is built from SIPs is how well it performs.

How are SIPs finished on the inside?

Internally, SIPs are usually finished with plasterboard. Because SIP panels are manufactured to tight tolerances, the walls are straight and accurate, which makes plasterboarding straightforward. We have standard details showing how to incorporate a service void, and the finish can be adapted to suit the room and the level of services required.

What is a service void in a SIP wall?

A service void creates a dedicated space between the SIP structure and the internal finish. It provides room for services such as electrical wiring, without unnecessarily interfering with the panel itself.

It’s typically formed with timber battens fixed to the inside face of the SIP, with the plasterboard fixed over them. Your electrician can then run cables and fit back boxes in the void, leaving the structural OSB skins and insulation core intact.

Can you fix plasterboard to SIPs?

Yes. Plasterboard can be fixed to SIPs using screws through to the OSB skin or to battens, in a similar way to a timber frame wall. Where there are no services, it can be fixed directly to the panel. Where there are, a service void is created first. Your plasterboard specification, including any fire-resistant or moisture-resistant boards, should be agreed with your designer and building control.

Where do electrical cables and services go in a SIP house?

In most cases, cables, back boxes and small-bore pipework sit in the service void behind the plasterboard. This is why it pays to plan your services as part of the SIP design, before the panels are manufactured. Deciding early where consumer units, sockets, switches, light fittings and larger runs such as ventilation ducts and soil pipes will sit means they can be accommodated in the design, in internal stud walls or a dedicated service zone. That avoids cutting into the panels on site. Your electrician and mechanical services designer should be involved at this stage, not once the shell is up.

Does SIPS Eco provide details for different finishes?

Yes. SIPS Eco Panels has standard details available showing how a range of external cladding and internal finishing options can be incorporated into the SIP system. Our team can work with your architect, designer or contractor to establish the appropriate detail for your project.

SIPs cladding and finishes FAQs

Can you brick clad a SIP house?
Yes. Brick is built as an outer leaf in front of the SIP structure, across a cavity and tied back to it. It needs foundations designed to carry the load.

Do SIPs need a ventilated cavity behind the cladding?
Most cladding types are fixed to battens over a breathable membrane, which creates a ventilated cavity. Your designer will confirm the detail for your chosen system.

Can you fit kitchen units and heavy fixings to SIP walls?
Yes, but plan them at design stage so that any additional support, noggins or fixing points are built in where needed.

Can SIP houses have a modern or traditional look?
Both. The finish is chosen independently of the structure, so a SIP house can be brick-built in appearance, timber-clad, rendered or a combination.

Can SIPs be used with other framing systems?
Yes. SIPs are commonly used as infill panels with oak, steel and glulam frames, with the exterior finished in any of the options above.

Planning a SIPs project?

Talk to the SIPS Eco team about your preferred external and internal finishes and we can advise on the appropriate standard details for your build. To learn more about the system itself, read our Complete Guide to Self-Building with SIPs, or explore our technical information and case studies.