DryBloc® TG4 – The Universal Floorboard for Modern Construction
A Structural Floorboard for Residential and Commercial Projects
Suitable for flooring applications, including wet underfloor heating (UFH), acoustic/ soundproof flooring, dry screed panel systems, and tiling
DryBloc® TG4 is a premium tongue and groove floorboard engineered as the ultimate foundation for modern floor constructions. Whether you're installing underfloor heating, acoustic flooring, dry screed systems, or tiled finishes, DryBloc® provides outstanding strength, dimensional stability, and versatility for almost any project.
High Density Overlay Board as a wet underfloor heating (UFH), acoustic soundproof flooring, dry screed panel systems, and tiling
Description
CEMBLOC® DryBloc® TG4 is a high-performance tongue and groove (T&G) structural floorboard, available in 18mm and 22mm thicknesses. Manufactured from reinforced fibre cement and strengthened with natural mineral reinforcement on both faces, it delivers exceptional load-bearing capacity, dimensional stability, and long-term durability for demanding flooring applications.
With an A1 non-combustible fire classification, DryBloc® TG4 provides a robust solution for projects where fire safety, strength and performance are essential. Its slim profile makes it an ideal dry screed alternative, reducing finished floor build-up and eliminating the lengthy drying times associated with traditional wet screeds.
Engineered for modern construction, DryBloc® TG4 offers an impressive thermal conductivity of 0.216 W/mK, making it an excellent choice for wet underfloor heating (UFH) systems by promoting efficient heat transfer and improved system performance. Its high-density composition also delivers outstanding airborne sound reduction, making it suitable for acoustic floor constructions in both residential and commercial environments.
Unlike conventional gypsum or cement particle boards, DryBloc® TG4 combines fire resistance, acoustic performance, moisture resistance and exceptional structural stability in a single multipurpose flooring panel. Whether used for underfloor heating, acoustic flooring systems, tiled floors, dry screed applications or general structural flooring, DryBloc® TG4 provides a reliable, high-performance foundation for virtually any project.
DryBloc® TG4 is superior flooring board with exceptional dimensional stability of (<0.19%) compared to alternatives such as chipboard, gypsum fibre and cement bonded particle board.
Our professional team are here to help you with any questions.
Key Features
Standard Sizes
Thicknesses: 18mm, 20mm, 22mm
Dimensions: 1200mm x 600mm
Fire Performance
A1 Fire Class
Side Profile
Tongue & Groove on all four sides
Span
Up to 600mm (for 22mm variant)
📐 DryBloc® TG4 Floor Board Calculator
Not sure how much you need?
Use our DryBloc® TG4 Floor Board Calculator to quickly estimate the number of boards, screws, and adhesive tubes you’ll need for your project. Just enter your floor dimensions and select your board type — we’ll do the rest.
What it covers:
- ✔️ Total number of DryBloc® TG4 boards
- ✔️ Required CemBond® Max Strength adhesive
- ✔️ Minimum number of CEMBLOC® FCB Screws
This tool is ideal for planning and ordering with confidence — no guesswork, no waste.
💡 Tip: Always round up slightly to allow for offcuts or future repairs.
⚠️ Disclaimer: This calculator is provided as a planning aid only. CemBloc® accepts no liability for material shortfalls, wastage, or miscalculations. Always consult your installer and allow for site-specific conditions.
| Product | SKU | Length | Width | Thickness | Weight | Edge Detail |
|---|---|---|---|---|---|---|
| DryBloc® TG4/18 | CEM6006 | 1200mm | 600mm | 18mm | 17.50kg | TG4 |
| DryBloc® TG4/22 | CEM6008 | 1200mm | 600mm | 22mm | 21.38kg | TG4 |
Distributed Loading Capacity - Continuous loading
| Joist Spacing (ctrs) | 450mm | 600mm |
|---|---|---|
| Recommendations | DryBloc® TG4/18-22mm | DryBloc® TG4/22mm |
| 18mm | 3.50 kN | N/A |
| 356.9 kg | N/A | |
| 22mm | 4.70 kN | 2.70 kN |
| 479.26 kg | 275.32 kg |
Note:
- Concentrated load is applied over an area of 300mm x 300mm.
- Allowable maximum deflection is limited to l/250 of joist spacing.
- For spans above 450mm we recommend DryBloc® TG4/22, for spans below 450mm, DryBloc® TG4/18 are suitable (subject to loading)
Support for Your Project
Have a technical advisor get in touch to discuss your needs and work out a suitable, effective solution for you. Get a quote, our experts are here to help you find the best solution for your project. Call us today:
+44 (0) 208 050 5302
or send an email to
support@cembloc.com
Advantages Of Use.
- Provides durable protection for sub-construction systems, extending their lifespan.
- Resists dirt buildup, contributing to low-maintenance requirements.
- Manufactured without harmful substances and is environmentally friendly.
- Guaranteed asbestos-free for safe use in various environments.
- Classified as A1 for fire safety, meaning it is non-combustible.
- Does not emit toxic gases when exposed to fire.
- Highly resistant to moisture and water exposure, reducing risk of warping or swelling.
- UV-resistant, withstanding prolonged sunlight exposure with minimal degradation.
- Dimensionally stable, resisting cracking from seasonal temperature changes.
- Allows for straightforward installation and modifications.
- Can be precisely cut with suitable tools, such as carbide-tipped saws.
- Functions as a dry finishing material, eliminating the need for wet screed and associated drying times.
- Protects and extends the life of insulation materials in thermal and acoustic systems.
- Exhibits extremely high dimensional stability (<0.19%) compared to chipboard, gypsum, and cement particle boards.
- Moisture-resistant, effectively reducing water absorption compared to traditional wood and gypsum-based boards.
- Odourless and does not release toxic gases.
- Highly resistant to impact, making it suitable for high-traffic areas.
- Resistant to biological and chemical waste exposure, maintaining structural integrity.
- Lightweight and easy to transport.
- Insect-proof, non-putrescible, and resistant to mold growth.
- Versatile for a wide range of building applications.
- Compatible with insulation materials of any desired thickness.
- Provides smooth, precise cuts for fine detailing in installations.
- Offers very high impact resistance, significantly exceeding that of gypsum-based boards.
Profile.
Our suggestion is to place the smooth side facing up. Make sure to maintain consistency in the orientation of each board during installation.
Areas Of Use.
- Compatibility with Routed Insulation for Underfloor Heating: This cement fibre board can be used in conjunction with routed insulation for Underfloor Heating (UFH) applications, offering a thermal conductivity of 0.216 W/mK.
- Versatile Flooring Options: It is suitable for installation on both timber and steel joisted floors, providing flexibility for various construction needs.
- Integration with Metsec Style Decking: The board can also be incorporated into a buildup on Metsec-style decking, enhancing the overall structural performance.
- Joist Spacing and Thickness Recommendations: This cement fibre board is designed to span joists at a spacing of 450 mm or less when using 18 mm thickness. For joist spacings above 450 mm, we recommend using the 22 mm thickness to ensure optimal support and stability, while also being mindful of the overall loading capacity.
- Wet Screed Replacement: Ideal for use as a replacement for traditional wet screed applications, offering enhanced durability and moisture resistance.
- Compatible with Beam and Block Constructions: Suitable for integration into beam and block flooring systems, providing structural support and stability.
- Access Flooring Solutions: Effectively used in access flooring systems, allowing for easy installation and maintenance of utilities.
- Raised Terrace Applications: Appropriate for raised terrace constructions, delivering a robust surface that withstands environmental elements.
- Mezzanine Flooring: Can be utilised in mezzanine flooring applications
- Replacement for Traditional Timber Floorboards; Serves as an excellent alternative to traditional timber floorboards, offering improved moisture resistance and longevity.
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