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Intrim Shadowline® is a patented skirting and door jamb system with a 10mm recessed shadow gap moulded directly into the board. Unlike traditional methods where the shadowline is built on site, the shadowline detail is factory-machined into the profile for a cleaner, more consistent finish.
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Home > Skirting and Architraves > Shadowline skirting
Shadowline skirting, also known as recessed skirting or flush finish skirting, replaces a traditional protruding skirting board with a clean, recessed shadow gap at the base of the wall. The result is a minimalist, architectural detail that creates the appearance of walls floating above the floor while maintaining practical wall protection.
Intrim Shadowline® is a patented flush finish skirting and door jamb system that creates a clean recessed shadowline detail without the complexity of traditional P50 metal angle or L-bead methods. The 10mm shadow gap is machined directly into the board, delivering a more consistent finish and eliminating the need to build the shadowline on site.
The key difference between Intrim Shadowline and traditional methods is where the shadow gap is created.
Traditional P50 or L‑bead systems
Intrim Shadowline
Because the shadow gap is built into the board itself, the finished line remains consistent from corners through to full 5.4m lengths, and curved walls.
Internal testing found Intrim Shadowline can be installed up to 4.5 times faster than traditional P50 methods. By removing the need for additional metal angles, beads, noggins, and site-built shadow gaps, installation becomes significantly quicker and simpler.
The profile arrives ready to install. There is no separate shadowline component to align, plaster, or finish on site.
The shadowline is machined into the board rather than formed on site, helping maintain a consistent groove width and cleaner finish throughout the project.
Available in lengths of 5.4 metres, reducing visible joins and helping create a cleaner continuous shadowline.
The Shadowline skirting system includes a 1-piece skirting board with options for 10mm and 13mm plasterboard, a coordinated flush finish door jamb, and a CSRIO-tested fire-compliant option. Explore all Shadowline profiles below.
For builders, the case for SK800 is install time and rectification cost. For designer and architects, it is the consistency of the finished line.
A shadowline detail is only as good as its weakest junction. The DJ800 Shadowline Door Jamb mirrors the SK800 skirting profile and suits 70 mm and 90 mm stud widths in 30 mm and 40 mm thicknesses. The same shadow-line detail can be carried across architraves, openings, and curved feature walls so the recessed line runs through the whole space.
Watch the video below to hear what one of our satisfied customers has to say about working with the Intrim Shadowline skirting system.
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For projects that require fire-rated skirting is required under the Building Code of Australia (BCA), such as multi-residential apartments, aged care, hotels, hospitals, and any Class 2–9 build under the National Construction Code, Intrim manufactures the SK800FR Shadowline® FR MDF profile. It has been tested by the CSIRO to AS 1530.4-2014 and achieves an FRL of -/60/60, so specifiers can keep the Shadowline detail in fire-rated walls without compromising compliance. This fire rating can be achieved with only a single layer of plaster, rather than double-sheeting – which is required with P50 or L-bead methods.
NOTE: Fire-rated installation differs from standard installation. Specifications, installation instructions, and the CSIRO assessment summary are available on request.
Three practical decisions determine which profile suits your project, and none of them change the look; every profile delivers a true flush finish.
Plasterboard thickness
Visible skirting height required
Fire rating requirements
View the full Shadowline table of dimensions before specifying
Shadowline skirting is installed before plasterboard and flooring. The skirting and door jamb are fixed first, the plasterboard is installed against the profile, and the joint is finished with a setting compound and reinforcing tape. Intrim recommends Fiba Fuze tape and the manufacturer’s recommended drying time between coats – approximately 24 hours in normal conditions and 48 hours in cool conditions.
Using 1-piece Shadowline skirting with timber or tiled flooring
When installing 1-piece Shadowline skirting with timber or tiled flooring, there are two sequencing options.
Install the flooring first, protect the finished floor with suitable floor protection, then install the plasterboard and Shadowline skirting so the recessed detail finishes cleanly above the floor. This is the method Intrim recommends, as it helps protect the flooring set-out and supports a cleaner final junction.
Alternatively, you can install the Shadowline skirting first and leave a gap at the bottom of the board so the timber or tiled flooring can be slipped in later. While this can suit some projects, it requires careful set-out to allow for flooring thickness, expansion requirements and a consistent shadowline finish.
Watch the installation videos below or refer to the Shadowline installation guide for step-by-step instructions.
The Shadowline detail does its best work where the rest of the architecture is allowed to be quiet. The projects below show how Intrim Shadowline skirting reads across different scales, finishes, and design languages, from a coastal apartment to a curved contemporary build.
Before plasterboard and flooring. The skirting and door jamb are fixed to the framing first, followed by plasterboard. The joint is finished with setting compound and reinforcing tape.
Because the shadow gap is machined directly into the profile rather than built from plaster and beads, it is far more consistent and less prone to cracking associated with traditional methods.
Yes. The detail can be specified across walls, door openings, and curved feature walls, so the same recessed line carries through the whole space. The MDF can be kerfed, or for a tighter radius choose our flexible polyurethane.
Not within the Intrim Shadowline System. A Shadowline ceiling treatment uses a metal angle at the wall-ceiling junction in place of a traditional cornice. It is commonly specified alongside Shadowline skirting and door jambs to maintain a consistent contemporary detail throughout an interior, but it is constructed by the plasterer rather than supplied as an Intrim product.
Shadowline skirting is priced in line with comparable Intrim profiles of the same size, material, and thickness. For project pricing, log into INTRADE – our online ordering portal and create an account.
SK800 series profiles are supplied in 5.4 metre lengths. This is significantly longer than standard P50 skirting lengths and reduces the number of joins on long wall runs. Polyurethane lengths are 5.1 metres.
Yes. The Shadowline System is supplied as primed MDF. The factory-applied primer creates a moisture barrier and provides a consistent base for paint.
Yes, the Sk800FR profile is fire-rated MDF, tested by the CSIRO to AS1530.4-2014 with an FRL of -/60/60 for Class 2-9 buildings under the NCC.
Shadowline contemporary residential project
Easy to follow step-by-step guide
Coordinated Shadowline door jambs
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