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Shadowline System

Create a modern look using Intrim’s exclusive SK800 series Shadowline system. The system eliminates the inconvenience of using a P50 angle or PVC 10mm Shadowline bead, saving you up to 30% of your installation time, saving you money. This modern look skirting provides a neat finish to the base of plasterboard walls. Skirting ‘steps back’ from plasterboard surface creating a distinct shadowline finish

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Why choose Intrim Shadowline system?

The Intrim Shadowline Series skirting and door jambs are a patented system, unique to Intrim having been designed by Intrim’s founder, a former chippy who innovates to solve the common problems faced in Australian construction. Having been created with ease of installation, time and cost savings to our customers in mind to deliver a quality finish, the Intrim Shadowline system has quickly become extremely popular due to the significant benefits it provides.

Being a system which is different to others in the market, we are often asked about the differences with installation, strength and durability to alternative Shadowline systems. We have addressed the most common questions and concerns below, and our team are available to discuss your specific project to help guide you through your selection of Shadowline skirting and doorjambs.


What is Intrim Shadowline vs P50 skirting?

Intrim Shadowline is a skirting board and door jamb system, where the shadowline is moulded into the timber providing a precise architectural line, unlike the P50 metal angle and plastering method to create a shadowline.

We often get asked by builders and installers who have worked with the P50 system, “how strong is the join?” and “is it going to crack?”. This concern stems from what seems like an unusual partnership between timber and plaster at a join, and the worry that the two surfaces may not bond well, be as strong or that moisture may affect the join over time.

When selecting our timber suppliers, we choose only the best. Our careful selection ensures that our timber is of the highest quality and the moisture content in the finished timber is tested and correct. As well as this, we rigorously test all of our timber materials to ensure they meet the high standards and specifications required for achieving ultimate strength and durability.

As an added safeguard to your project, we only offer our Shadowline System pre-primed, which provides an additional moisture barrier around the timber to further reduce moisture intake over time and potential timber changes during acclimatisation.

During installation we recommend using Fiba Fuze tape which creates a strong, seamless join, without the risk of crack appearing. To avoid cracking you must also allow the jointing compound to dry fully between coats as per the manufacturer’s specifications and instructions. Drying times are approximately 24 hours in normal conditions or 48 hours in cool conditions between each coat. See USG Boral instructions here.

You can see in our demonstration video that even a sledgehammer cannot break the join.

Why would I buy Intrim SK800 shadowline?

With the Intrim Shadowline System, common issues experienced when using a P50 metal angle are eliminated, such as messy Shadowline grooves, misalignment and length of time to install. Intrim’s Shadowline saves 30% time on installation over other Shadowline products and install methods.

This ease of installation experienced with the Shadowline system and the neat finish saves time on rectifying defects that commonly occur, resulting in faster, high-quality projects with fewer costs.

Not only does the Shadowline save on time and money, but it also achieves a stunning, neat finish that creates phenomenal residential and commercial interiors.

See what our clients say about Intrim Shadowline system.

How to choose your Shadowline Skirting?

Selecting the right profile for your project is critical to achieve your vision. Click to view and read the below sections where we will step you through how to choose your Shadowline Skirting. Still can’t find what you are looking for? Keep scrolling for our frequently asked questions.

How to select your Shadowline skirting size?

Intrim Shadowline System door jambs are available to suit 70mm and 90mm stud widths and available in 30mm and 40mm thicknesses. Shadowline Skirting Board are available to suit 10mm (most common for residential applications) and 13mm plasterboard thickness. 18mm thick FR MDF is used for fire rated skirting board.

Many skirting heights are available ranging from 90mm to 285mm, which delivers a visible height from 65mm to 260mm. Custom sizes can be made to suit your project, however when choosing the height of your Shadowline Skirting Board, be mindful that the Shadowline itself sits 35mm down from the overall height of the timber. To make selecting your Shadowline skirting we have referenced the sizes as the visible height, which is the height from the bottom of the board to the top of the Shadowline groove. See the Shadowline table of dimensions to easily select the size and type to suit your project.

The Shadowline groove is offered in 10mm or 5mm to suit the look that best suits your particular project.

As our timber mouldings are made to order we can customise the dimensions to meets your project requirements on request.

Shadowline Skirting Board Quick selector

Select the options that match your project requirements to determine the most suitable profile code for your project.

SKU Code Fire Rated Plasterboard thickness Required Skirting thickness 1-piece system. Suitable for Carpet 2-piece system. Suitable for timber or tiled floors Shadowline Groove (height x depth)
x H: 10mm
D: 6mm
SK800FR x 15mm 18mm x H: 10mm
D: 6mm
SK801-802 10mm 12mm x H: 10mm
D: 6mm
SK803-804 13mm 15mm x H: 10mm
D: 6mm
x H: 5mm
D: 5mm

Helpful resources

Our Work

Case Study: Shadowline project

Shadowline contemporary residential project

See project inspo
Installation Guide

How to install Shadowline Skirting

Easy to follow step-by-step guide & videos

See Guide
Complementary product

Matching Shadowline Door Jambs

Shadowline is a skirting & door jamb system.

See more

Frequently asked questions

At what stage of my project is the Intrim 800 Series Shadowline door jamb and skirting installed?

They are both installed prior to the plasterboard installation. Door jambs are assembled by forming mitre joints where the head joins the stiles as opposed to the traditional half joint. The door jamb is then installed and packed plumb and level. It is critical that the jamb material is centrally located over the framing material and runs parallel with the framing material so that the PVC (PLTB 630) plaster stop bead fits neatly against the door jamb material. Skirting is installed to fit tightly between the door jambs. The plasterboard sheets are then installed tight against the back face of the 800 Series door jamb and on top of 800 Series skirting. The PVC (PLTB 630) stop bead is then installed to surround the door jambs. All joints between the bottom edge of plasterboard sheeting and top edge of shadowline skirting are to be plaster set and must also include reinforcing joint paper tape when setting. Also plaster set all PVC stop beads surrounding the door jambs.

What if my flooring needs to be installed after gyprock installed?

Intrim’s Two Piece Shadowline SK801-802 and SK803- 804 systems have been created to solve this problem! It allows for removal of the bottom piece of skirting so that flooring can be installed and then the Shadowline skirting piece replaced and fixed in place over the top of the flooring. This eliminates the need to place an unsightly timber floor bead where the bottom corner of the skirting meets with the top of flooring junction and maintains the minimalistic theme featured with 800 series.

Is Shadowline 800 Series skirting suitable for carpet and timber flooring applications?

Yes. The one piece SK800 profile is suitable for carpet finish and hard flooring which can be installed prior to plasterboard. The 2 piece profile is used in timber or tile flooring applications where installation occurs after the walls have been plastered.


Is the Intrim 800 Series Door Jamb available in different section sizes to suit different width wall framing and plasterboard thicknesses?

Yes. We are able to manufacture these to suit any application.

How easy is Shadowline to install?

If you have installed the P50 angle shadowline system in the past, Intrim’s Shadowline system will save time and allow you to create a consistent and accurate shadowline detail. SK800 series skirting is supplied in 5.4m lengths rather than the shorter lengths of P50 that are available as this minimises joins and eases the installation process for longer wall sections. We have a full installation guide page with videos, step-by-step instructions and downloadable brochures.

How much is Shadowline Skirting?

Shadowline Skirting is the same price as other skirting boards profiles of the same size, material and thickness from the Intrim range. If you are after a price for budgeting purposes, you can either request a quote for your specific project, or determine the size of your Shadowline skirting and look up the size in our price list to provide a guide for your project.

How do I work out the size of Shadowline skirting to use?

The sizes of the Shadowline skirting are now shown as the visible height, NOT the total skirting board height. This allows you to simply measure from the floor up to the top of where you want the Shadowline groove to be positioned. That will be the visible height (as the top of the skirting is hidden behind the plasterboard). This diagram and Shadowline table of dimensions provides you with all the dimension options to help you select the size that best suits your requirements.

Can I use Intrim Shadowline for a project requiring fire rating compliance?

Intrim’s Shadowline SK800 Fire Rated MDF Skirting board has been extensively tested to meet the fire resistant AS1530.4-2014 standards it will achieve a FRL: -/60/60.

Is Intrim SK800 Shadowline System suitable for curved walls?

Yes, we can manufacture to suit curved wall applications. Talk to us about your requirements.

Curved Shadowline Skirting Curved Shadowline Skirting

What is a Shadowline ceiling?

A Shadowline ceiling is a treatment where a traditional cornice mould is not used. Instead, a shadowline using a metal angle is created in the ceiling where it connects to the wall. This differs to square-set where a 90 degree angle between the walls is used without a shadowline. It is common when selecting a Shadowline ceiling to complement the contemporary modern style with Shadowline skirting and doorjambs to provide a consistent style. The Intrim Shadowline system is not available for ceilings.

What is a Shadowline cornice?

A shadowline cornice is a term used to describe a shadowline ceiling where the flush shadowline is created using metal angle around the edge of the ceiling where it meets the wall. A shadowline cornice matches perfectly with Intrim Shadowline SK800 system. The Intrim Shadowline system is not available for ceilings.

Will the Shadowline crack on Intrim Shadowline Skirting?

No, it won't so long as you follow the correct installation instructions. During installation we recommend using Fiba Fuze tape which creates a strong, seamless join, without the risk of crack appearing. To avoid cracking you must also allow the jointing compound to dry fully between coats as per the manufacturer’s specifications and instructions. Drying times are approximately 24 hours in normal conditions or 48 hours in cool conditions between each coat. See USG Boral instructions here. You can see in our demonstration video that even a sledgehammer cannot break the join.

Fire Rated Shadowline Skirting Boards

After extensive CSIRO testing Intrim SK800 Shadowline® FR MDF skirting board meets the AS1530.4-2014 standard. You now can now achieve a clean look for maximum aesthetic impact in your projects while meeting BCA fire compliance.

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Is Intrim Shadowline fire rated?

Yes, the Intrim SK800 Shadowline® FR MDF skirting board meets the AS1530.4-2014 standard and is considered fire rated meeting the requirements for BCA fire compliance.

How the Fire Rated Shadowline testing was conducted?

The pilot scale fire resistance test was carried out by CSIRO North Ryde in accordance with AS 1530.4-2014 of a non load bearing plasterboard lined wall system.

The specimen comprised a 1200mm x 1200m plasterboard lined wall system which incorporated 64mm steel stud wall framing lined on both sides with 16mm thick CSR Fyrchek platerboard. The wall specimen included an Intrim 800 Series Shadowline skirting board, screw fixed along the bottom of the framing, on both sides of the wall.

The bottom of the cavity was lined with friction fitted 300mm x 50mm thick x 60kg/m3 Bradford Fibretex 350 Rockwool board continuously behind the skirting board.

The skirting board was Intrim® SK800 Shadowline® System, made from FR treated medium density fibreboard (FR MDF), that was 18mm thick and 140mm high. The joint between the plasterboard and skirting board was set using a standard plaster setting compound.

What specifications were required to meet the fire rating?

The proposed construction to meet the fire rating shall be a 64mm steel stud 16mm fire grade plaster board lined wall (achieving an FRL of at least-60/60 without cavity insulation) that includes Intrim’s FR MDF SK800 skirting board backed with 50mm CSR Fibretex 350 Rockwool insulation and a Bead of Bindex Fire & Acoustic Sealant between base of skirting and floor substrate, as shown in the diagram below.

What variations to the plasterboard facing are allowed?

The proposed construction shall be a steel stud plasterboard lined wall than includes an Intrim Mouldings FR MDF skirting board backed with 50mm CRS Fibretex 350 Rockwool insulation as tested in FSP 1997 and subject to the following variations:

  • The wall linings may vary to include other proprietary brands and 16mm Fire grade plasterboard provided they have been tested or assessed to be fixed to each side of a 64mm steel stud without cavity insulation and achieve an FRL of at least 60-60. The plasterboard used in this test was 16mm CSR Fyrcheck plasterboard.
  • The wall may increase in height.
  • If the wall increases in thickness the maximum difference between the insulation thickness and the cavity size shall be as tested 14mm.

What were the CSIRO Fire Rating Results for Intrim Shadowline Skirting?

When tested the specimen achieved an integrity performance of 85 minutes and insulation performance of 65 minutes.

Intrim Shadowline MDF FR meets fire resistant AS1530.4-2014 standards it will achieve a FRL: -/60/60

Revision B from the CSIRO Short Form Assessment Report FCO-3351, dated 28 July 2021)

Installing Fire Rated Intrim Shadowline Skirting

Installation instructions for fire rated Intrim Shadowline do vary from the non-fire rated instructions. See instructions FR instructions here.

 Shadowline Enquiry forms

Shadowline® Skirting Enquiry Forms

When making an enquiry about Shadowline we will ask you for some key dimensions and information. See the forms below to capture all the measurement details required.

Shadowline® Door Jambs Enquiry Forms

When making an enquiry about Shadowline we will ask you for some key dimensions and information. See the forms below to capture all the measurement details required.

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