Tile Backer Board  is a lightweight, waterproof high-density XPS foam tile backer board that replaces heavy, moisture-prone cement boards with a cleaner, faster, and more reliable solution. It creates a strong, durable, waterproof, and mold-resistant surface for showers, bathrooms, and wet areas — saving installers time and effort while ensuring lasting protection.

Superior Moisture Resistance – Closed-cell XPS core prevents leaks, rot, and microbial growth.

Installer-Friendly – Cuts with a knife — no dust, no power tools, no mess.

Rigid & Load-Bearing – Supports large-format tile and heavy stone.

Up to 70% lighter than cement board for effortless transport and installation. Reduce fatigue and speed up every job.

Long Term Performance - Will not warp, deform, or rot over time.

100% Waterproof – Inherently waterproof XPS foam tile backer board with effective vapor resistance. Protects walls, floors, and subfloors from water damage, leaks, and mold.

）Closed-Cell Integrity – Maintains full waterproof performance even if the outer surface is cut or punctured. Unlike open-cell materials, it will not absorb or wick moisture.

Mold & Mildew Resistant – Non-organic composition prevents microbial and fungal growth for long-term durability and a cleaner, healthier installation.

Long Term Durability – PROVA-Board will not warp, swell, or deteriorate over time—preventing tile cracks and grout failures for a long-lasting, beautiful tile install.

Thermal Insulation - XPS foam core delivers excellent insulating value, ideal for saunas, or residential steam rooms (requires installation in conjunction with PROVA Mat).

Exterior wall waterproof backing board: the invisible guardian of building waterproofing

1、 Definition and core functions

Exterior wall waterproof backing board is a composite material board installed on the outer side of the building's exterior wall insulation layer or structural layer, mainly responsible for the triple mission of waterproofing, moisture resistance, and enhancing structural stability. In the building enclosure system, it is like an "invisible armor" that effectively solves common problems such as rainwater infiltration and condensate accumulation through physical barriers and capillary drainage principles. According to the International Chamber of Architects (ICBO), buildings using high-quality backing panels can reduce exterior wall leakage rates by over 85% and significantly extend the building's service life.

2、 Mainstream materials and technical parameters

1. Polymer board

-Material: HDPE (high-density polyethylene), PVC (polyvinyl chloride)

-Characteristics: Tensile strength ≥ 8MPa, water absorption rate<0.5%, stable working conditions at -30 ℃~80 ℃

-Representative product: Grace Ice&Water Shield series from the United States

2. Modified asphalt substrate

-Structure: Tire base (polyester felt/fiberglass felt)+modified asphalt coating

-Advantages: self-healing performance (automatic repair of 2mm cracks), fire rating B1

-Parameters: Thickness of 1.5-3mm, root puncture resistance strength ≥ 800N

3. Composite material system

-Innovative technology: such as Owens Corning's "sandwich structure", with a middle layer of nano silicon waterproof film and composite non-woven fabric on both sides

-Performance: Air permeability ≥ 1000g/㎡· 24h, achieving waterproof and breathable balance

3、 Key Construction Technical Specifications

1. Preprocessing standards

-The moisture content at the grassroots level should be less than 8% (measured using a CM-3 humidity detector)

-Flatness deviation ≤ 3mm/2m, internal and external corners require R ≥ 50mm arc treatment

2. Installation process

-Misalignment paving: longitudinal overlap ≥ 100mm, transverse overlap ≥ 150mm

-Fixed method: The polymer board adopts a special adhesive (dosage ≥ 1.2kg/㎡)+mechanical anchoring (no less than 8 anti-corrosion screws per square meter)

-Node processing: U-shaped drainage channels are set around the window openings, and polyurethane sealant (width ≥ 10mm) is used at the joints

3. Quality acceptance

-Closed water test: water injection height of 20mm, no leakage within 24 hours

-Infrared thermal imaging detection: If the temperature difference is ≤ 2 ℃, it is judged as no hollowing

4、 Technological innovation direction

1. Intelligent response materials

The "humidity sensing backing board" developed by BASF in Germany contains hydrophilic molecular chains, which automatically expand to form a dense waterproof layer when the humidity exceeds 70%.

2. Integrated photovoltaic design

The transparent backing board launched by Asahi Glass in Japan can be integrated with solar thin-film cells to achieve dual functions of power generation and waterproofing, and has been applied in the Tokyo Olympic Village project.

3. Application of recycled materials

The new environment-friendly backing plate supported by the EU "Horizon 2020" plan uses recycled tire rubber particles (content ≥ 30%), and its anti-aging performance is improved by 40%.

5、 Selection decision matrix

|Evaluation dimensions | Commercial buildings | Residential projects | Industrial plants|

|----------------|-------------------|-------------------|------------------|

|Waterproof grade | ≥ Grade II (GB50108) | ≥ Grade I | Corrosion resistant type|

|Cost budget | 80-120 yuan/㎡ | 50-80 yuan/㎡ | 100-150 yuan/㎡|

|Service life | Over 25 years | Over 15 years | Over 20 years|

|Special Requirements | Curtain Wall Compatibility | Seismic Performance | Chemical Corrosion Resistance|

6、 Typical Engineering Cases

The Shanghai center Building adopts a three-layer composite backing system:

1. Base layer: 2mm thick fluorocarbon coated aluminum plate

2. Intermediate layer: 1.5mm polymer drainage film (vapor permeability 1200g)

3. Surface layer: 3D printed titanium alloy mesh (wind pressure resistance 12kPa)

The system successfully withstood extreme rainfall during Typhoon Lekima (with a daily precipitation of 289mm), and the humidity inside the curtain wall remained below 45% RH.

Conclusion

With the implementation of the General Code for Waterproofing of Buildings and Municipal Engineering (GB55030-2022), the waterproof design work period has been extended to 25 years, and the backing board is being upgraded from auxiliary materials to core waterproof structures. In the next 3-5 years, intelligent backing boards that combine self-healing, energy harvesting, and carbon footprint visualization functions will become mainstream in the market, driving building waterproofing into a new era of "active defense".