01THE BUILDING ENVELOPE
Wall sheathing
Versatile boards for timber and steel frame construction, new builds and renovation.
A stronger foundation for your next build
BUILT FOR
WHAT COMES
NEXT.
Magnesium sulphate boards. Engineered for demanding builds, from the structure to the final finish.
Find your board ↗Explore the brochure ↓Listen to brochure ↗WALLS. FLOORS. FINISHES.01 — SULFROCK®
MATERIALS THAT
MAKE THE DIFFERENCE.
From concept to construction.MAKE THE DIFFERENCE.
NO ADDED MAGNESIUM CHLORIDE+MOISTURE RESISTANCE+VERSATILE APPLICATIONS+BUILT TO LAST
01 / The range
One material.
More possibilities.
Four specialist board ranges. A practical solution for every layer of your project.
01
02A SOLID START
Sub-flooring
A durable alternative to OSB and plywood, with tongue-and-groove options for floor systems.
03FINISH WITH CHARACTER
Decorative boards
Magnesium sulphate substrates with a choice of laminated textures and surface finishes.
04BEHIND A BETTER FINISH
Backer boards
A stable base for render, brick slips, plaster and tiles, for internal and external applications.
02 / Material matters
TOUGH WHERE
IT COUNTS.
A magnesium sulphate formulation reinforced with fibreglass mesh. Designed to bring strength, stability and flexibility to construction.
Get the full picture ↓Fire performance
The 12 mm board has an A1 reaction-to-fire classification. An ASTM E119 assembly test achieved 120 minutes for its tested assembly; panel fire testing is due soon. Watch this space. Performance depends on the specified board and complete assembly.
Made for moisture
A moisture-resistant board formulation for demanding environments, with dimensional stability at its core.
No added magnesium chloride
Magnesium sulphate is used in the board formulation instead of magnesium chloride. Tested chloride content: 0.0098%, attributed to the water used in manufacture.
Practical on site
Options for timber and steel frames, multiple edge profiles and a broad choice of finishes to suit your project.
03 / Know your board
The detail.
Without the guesswork.
Compare the range, then speak to us about the right specification for your build.
| Board range | Thickness | Width options | Flexural strength |
|---|---|---|---|
| Wall sheathing | 5 / 6 / 8 / 9 / 10 / 12 mm | 1200 mm | 12–18 MPa |
| Sub-flooring | 15 / 16 / 18 / 19 / 20 / 22 mm | 1200 mm | 12–18 MPa |
| Decorative boards | 5 / 6 / 8 / 9 / 10 / 12 mm | 1200 mm | 12–18 MPa |
| Backer boards | 5 / 6 / 8 / 9 / 10 / 12 mm | 1200 mm | 12–18 MPa |
Board Fixing Detail
Watch the illustrative SulfRock® board fixing sequence. Confirm the fixing specification for your project.
For construction health and safety guidance, visit the Health and Safety Executive.
Health & safety guidanceStandard board sizes: 1200 × 2400 / 1200 × 2700 / 1200 × 3000 mm. Confirm thickness, edge profile and availability with our team.
Download brochure ↓Which edge profiles are available?+
The brochure lists square, chamfer, tapered T&G, ship-lap and tongue-and-groove profiles for sheathing and sub-flooring. Ask us to confirm the available profile for your chosen board.
How do I check fire performance for my project?+
Request the relevant test report and specification for the exact product and assembly. Board classifications and complete wall or floor fire-resistance ratings are different; the brochure’s test results should be read with their test conditions.
What finishes can I use?+
Decorative boards offer laminated film and melamine paper options. Backer boards are described for render, brick slips, plaster and tiles. Contact the team to check compatibility and installation requirements.
Health & safety files
Product safety information.
SulfRock board COSHH draft and supplier safety data for an IPS™ panel component. Check each document’s scope and approval status before use.
PLIXXOPOL RF 2217A — safety data sheet
Plixxent · GB version 1.1.0 · revised 13 May 2026. Check the product name and current supplier sheet before use.
SulfRock / Sulfycor COSHH assessment — DRAFT
Board handling, cutting and drilling. Site-specific signoff and verification of manufacturer safety data and dust composition are still required. Not a supplier safety data sheet.
For wider construction health and safety information, visit the Health and Safety Executive.
HSE construction guidanceManufacturer and brand
SulfRock® brand name.
SulfRock® is the authorised brand name for boards manufactured by Sulfycor New Materials Co., Limited. Sulfycor remains the manufacturer. Original test reports retain their stated manufacturer, sample and scope.
Document access
Company resources.
Technical reports: sign in with an approved email. Associates documents: use the separate associates password.
Let’s build something better
YOUR NEXT PROJECT.
STARTS HERE.
Tell us what you’re building.
We’ll help you find the right board.