Solid MgO sheet with a calm grey surface and practical 19mm flooring profile.
Canberra trade supply / MgO flooring underlay
19mm MgO Flooring Underlay
Work out the sheet quantity you need, then send the count, floor area or drawings. Heriton will confirm availability, delivery and project pricing based on the quantity.
Price on enquiryproject quote
19mm T&Gfloor board
Sheet countquote help
Canberrasamples & delivery
What is MgO?
A grey mineral board for floor build-ups.
Magnesium oxide board is a dense substrate layer used before waterproofing, adhesive and final floor finishes. It gives builders a stable base without adding another decorative surface to sell.
A silica-free option for builders who want a cleaner material story on renovation work.
Moisture, mould and insect resistant. Wet areas still require the approved waterproofing system.
Why builders care
The floor board can change the whole build-up.
A cleaner board choice can reduce joints, cuts, fixings and waterproofing preparation before tile, vinyl, carpet or timber-look finishes go down.
Silica-free board
A silica-free MgO substrate option for builders who want a cleaner material story on renovation and wet-area jobs.
T&G floor system
Long-edge tongue-and-groove sheets help the floor lay flatter and cleaner across joist and underlay applications.
Fewer joints
Large 2700 x 600 sheets can reduce joints, cutting, fixing and waterproofing preparation across the floor area.
MgO core advantage
MgO is moisture, mould and insect resistant, giving builders a more durable substrate option for demanding floor areas.
Where MgO earns a place
Where this board fits.
Best for wet-area and balcony scopes where the builder wants a sharper substrate number, a sample in hand and a clear sheet count before quoting.
Bathrooms & laundries
For wet-area floor builds where the membrane system is priced separately.
Tiled balconies
A 19mm board option for balcony and tiled deck build-ups, subject to project approval.
Joist floors
19mm tongue-and-groove board for timber or steel joists up to 450mm centres.
Repeat renovations
Use one board profile across similar bathroom and laundry scopes.
How to order
Send the job. Get the sheet count.
- Send the jobSuburb, floor area or drawings, joist spacing and finish.
- Get the sheet countWe confirm board quantity, sample availability and delivery.
- Check the sampleShow the board profile before the quote is locked in.
- Build the quoteCarry the same board profile into similar renovation jobs.
Specs for takeoff and approval checks
The facts your builder will ask for.
Use these details after MgO is worth quoting. Wet areas still require the nominated waterproofing system before tile or floor finish.
- Board size
- 2700 x 600 x 19mm
- Edge
- Tongue and groove long edges
- Density
- 1.35 g/cm3
- Weight
- 24kg/m2 / 39kg per sheet
- Joist spacing
- Up to 450mm centres
- Strength
- Bending strength >=19MPa / Wet MOR 21.6MPa
- Asbestos test
- AS4964: not detected
- Board category
- AS/NZS 2908 Category 5
- Wet areas
- Waterproofing system required before tile finish
Under tile, vinyl or carpet
The customer sees the finish. You win or lose on what sits underneath.
Grey mineral board, practical sheet size, clear quote path, ready sample.
FAQ
Straight answers before you try it.
The questions builders ask before putting a new board into a real job.
Why try MgO if my current board works?
Because it can give the quote a cleaner board number before the floor build-up is locked. Start with a small wet-area or balcony job and compare the total package.
Where is it strongest as a sales offer?
Bathrooms, laundries, tiled balconies, joist floors and repeat renovation scopes where price, sample speed and a 19mm tongue-and-groove sheet matter.
Is it waterproof by itself?
No. It is the board under the system. Wet areas still need the nominated waterproofing membrane and tile or floor-finish build-up.
Can it replace yellow tongue, fibre cement or Hebel?
Only when the builder, designer or certifier accepts the build-up. Treat it as an option to price and check, not as an automatic swap for every floor.
What do I send for a quote today?
Send the suburb, area or drawings, application, joist spacing, finish and delivery timing. Heriton can price the sheets, sample and delivery.
Final pricing and use depend on current stock, quantity, delivery, accepted substrate, waterproofing, fixing and project approval.