Shengtu Waterproof Composite Board is a factory-prefabricated composite panel featuring XPS (extruded polystyrene) core with reinforced polymer mortar surface layers. The panel combines thermal insulation, moisture resistance, and structural durability in one integrated solution for residential and commercial construction applications.
Core Structure:
- XPS extruded polystyrene board core
- 1.0-1.5mm polymer mortar reinforcement layer
- Alkali-resistant fiberglass mesh integration
Thermal Insulation & Energy Efficiency
Superior thermal performance with conductivity ≤0.030 W/(m·K), reducing heating and cooling costs in residential and commercial buildings.
Moisture & Mold Resistance
Enhanced waterproofing through modified polymer mortar formulation with antimicrobial additives. Antibacterial rate ≥90%, mold resistance Level 0-1.
Lightweight & Easy Installation
Prefabricated design eliminates on-site preparation. Compatible with multiple construction methods for walls, roofs, floors, and ceilings.
Eco-friendly & Sustainable
Carbon dioxide foaming technology without chlorofluorocarbon blowing agents. TVOC emission ≤1.000 mg/(m²/h), meeting environmental standards.
Product Structure of Waterproof Composite Boards
Polymer Mortar: This polymer mortar exhibits exceptionally high bonding strength with the core material, offers robust surface impact resistance, and possesses outstanding moisture-proof, impermeability, and mold-resistance capabilities. Furthermore, it features characteristics such as high-temperature resistance, anti-aging properties, and freeze-thaw resistance, while fully complying with all environmental protection standards. Its structural design—specifically, the lamination of the polymer mortar onto the surface of the core material—significantly enhances the convenience and reliability of subsequent construction processes.
Alkali-Resistant Fiberglass Mesh: This mesh fabric features excellent rigidity and dimensional stability, effectively enhancing the overall toughness of the XPS composite board. Thanks to its superior acid and alkali resistance, coupled with robust chemical stability, it ensures that the material remains protected against aging and corrosion throughout its long service life.
XPS Extruded Polystyrene Board: Manufactured using polystyrene resin as the raw material and employing advanced, eco-friendly CO2 foaming technology, the XPS extruded polystyrene board delivers exceptional thermal insulation performance, superior moisture-resistance characteristics, and extremely high compressive strength. 
40mm+ Panels: Residential roof insulation and thermal barriers
30mm Panels: Basement walls, exterior wall insulation systems
20mm Panels: Versatile applications including pipe encasements, wall leveling, stair treads, kitchen countertops, swimming pool backing
12mm Panels: Partition walls, room dividers, suspended ceilings, decorative backing
10mm Panels: Residential ceiling applications
6mm Panels: Feature wall backing, sintered stone substrate
Roof Systems: Compatible with asphalt shingles, resin tiles, color-coated steel, glazed tiles
Exterior Wall Insulation: Dot-and-frame adhesive method with mechanical anchors (4-6/m²)
Interior Wall Insulation: Self-leveling installation on uneven substrates
Bathroom & Wet Areas: Waterproof flooring, shower bases, bathtub surrounds, vanity backing
Basement Moisture Protection: Wall and floor moisture barrier systems
Suspended Ceilings: Light-gauge steel keel installation with seamless joint treatment
- Roof Insulation & Thermal Barrier
- Interior & Exterior Wall Insulation
- Bathroom Leveling & Moisture-Proofing
- Basement Moisture-Proofing
- Partition Walls & Suspended Ceilings
- Kitchen Countertop Substrate
- Swimming Pool Construction
- Oxygen Index: ≥30%
- Smoke Toxicity: Quasi-Safety Level 1 (ZA₁)
- Free Formaldehyde: ≤0.025 mg/(m²/h)
- Radioactivity: Internal/External Index ≤1.0/1.3
| Test Items | Metric Requirements |
| Premium Board | Eco-board |
| core Material | Apparent density, kg/m³ | ≥35 | ≥40 |
| Compressive Strength (10% Deformation), kPa | ≥350 | ≥500 |
| Thermal Conductivity (Average Temperature 25°C), W/(m·K) | ≤0.030 |
| Water Absorption (96 h immersion), % | ≤1.5 |
| Dimensional Stability (70±2°C, 48 h), % | ≤1.0 |
| Combustion Performance Classification | No lower than Grade B₁ |
| Oxygen Index (%) | ≥30 |
| Flexural Deformation (mm) | ≥20 |
| Compressive Creep (40°C, 40 kPa, 168 h) (%) | ≤1.5 |
| Water Vapor Permeability Coefficient [ng/(m·s·Pa)] | 1.5~3.5 |
| Total Volatile Organic Compound (TVOC) Emission [mg/(m²·h)] | ≤1.000 |
| Tensile Strength Perpendicular to Board Surface (MPa) | ≥0.40 |
| Foaming Agent Content (%) | The use of chlorofluorocarbon blowing agents is prohibited. |
| Flame Retardant Type (mg/kg) | Hexabromocyclododecane shall not be detected. |
| Smoke Toxicity Class | Attains Quasi-Safety Level 1 (ZA₁) |
| XPS Composite Board | Interlayer Bond Strength (MPa) | ≥0.40 |
| Surface water absorption, g/m² | ≤150 |
| Impermeability | The inner side of the reinforcement layer is not penetrated. |
| Impact Resistance (Number of Impacts) | ≥10 |
| Humidity Deformation (%) | ≤0.07 |
| Shear strength, kPa | ≥250 |
| Bending load, N | Not less than the self-weight of the plate. |
| Free formaldehyde emission, mg/(m²·h) | ≤0.025 |
| Antibacterial Properties | Antibacterial rate ≥ 90% |
| Mold Resistance | Level 0 or Level 1 |
| Compressive Elastic Modulus, MPa | Thickness ≤ 20 mm | ≤0.50 |
| Thickness > 20 mm | ≤1.20 |
| Radioactivity | Internal Radiation Index (IRa) | ≤1.0 |
| External Radiation Index (Ir) | ≤1.3 |
Performance Specifications for XPS Composite Board Thermal and Acoustic Floor Systems:
| Test Items | Metric Requirements |
| Weighted Normalized Impact Sound Pressure Level, dB | ≤65 |
Construction Methods for Waterproof Composite Boards
Roof Construction Methods
Method 1:
1. Lay OSB panels flat over the light-gauge steel framing on the roof and secure them using fasteners.
2. Lay XPS composite panels flat over the OSB surface and secure them using fasteners (the XPS composite panels and OSB panels must be laid in a staggered pattern).
3. Seal the joints between the XPS composite panels using Shengtu sealant, then embed a layer of fiberglass mesh tape over the joints. Use a suitable trowel to smooth the sealant, ensuring that both the fiberglass mesh and the fasteners are completely covered; this completes the roof’s waterproofing and thermal insulation layer.
4. Once the sealant has fully dried (approximately 1–2 hours), lay the roofing tiles over the XPS composite panels and secure them in place to complete the project. This method is suitable for various roofing materials, including asphalt shingles, resin tiles, color-coated steel tiles, and glazed tiles.
Method 2:
1. Lay OSB panels flat over the light-gauge steel framing on the roof and secure them using fasteners.
2. Cut XPS composite panels into strips 40–50 mm wide; secure these strips to the OSB panels at intervals of 30 mm. Then, lay full XPS composite panels flat over the strips to create an air cavity, securing them in place with fasteners.
3. Seal the joints between the XPS composite panels using Shengtu sealant, and embed a layer of fiberglass mesh tape over the joints. Use a suitable trowel to smooth the sealant, ensuring that both the fiberglass mesh and the fasteners are completely covered; this completes the roof’s waterproofing and thermal insulation layer.
4. Once the sealant has fully dried (approximately 1–2 hours), lay the roofing tiles over the XPS composite panels and secure them in place to complete the project. This method is suitable for various roofing materials, including asphalt shingles, resin tiles, color-coated steel tiles, and glazed tiles
Exterior Wall External Insulation Construction Methods
1. Clean the substrate surface of the exterior wall, removing any visible impurities;
2. Based on the designated installation location on the exterior wall, determine and verify the dimensions of the XPS composite panels;
3. Proceed with the adhesive installation of the XPS composite panels according to the established positioning; the panels shall be affixed using the “dot-and-frame” method, ensuring an effective bonding area of no less than 50%;
4. Twenty-four hours after the installation of the composite panels is complete, install mechanical anchors to provide supplementary fastening (at a density of 4 to 6 anchors per square meter);
5. Upon completion of the anchor installation, apply a layer of anti-crack mortar reinforced with alkali-resistant fiberglass mesh across the entire surface (to a thickness of 3 mm to 5 mm);
6. Apply exterior wall finishes—such as exterior paints, “True Stone Paint,” or “Water-in-Sand” coatings—to complete the exterior wall surface treatment.
Construction Methods for Interior Insulation of Exterior Walls
1. Clean the substrate surface of the interior wall, removing any visible impurities.
2. Based on the designated installation location for the interior wall, determine and verify the dimensions of the XPS composite panels.
3. Proceed with the adhesive installation of the XPS composite panels according to the established positioning. The panels shall be affixed using the “dot-and-frame” method, ensuring an effective bonding area of no less than 40%. During the bonding process, simultaneously level the wall surface to ensure flatness; bonding mortar must be used to seal any gaps between the panels and the substrate.
4. If mechanical fasteners are required to anchor the XPS composite panels to the substrate wall, the density of fasteners shall be 4 to 6 units per square meter.
5. Use bonding mortar to fill and seal all gaps between the panels, then apply and embed a layer of fiberglass mesh fabric.
6. Reinforce critical areas—such as the four corners of windows—with alkali-resistant fiberglass mesh fabric to prevent cracking.
7. Apply rust-inhibiting paint to the exposed surfaces of the mechanical fasteners to prevent corrosion.
8. Apply a finishing layer consisting of putty followed by paint or wallpaper/wall fabric; alternatively, use tile adhesive to bond ceramic tiles as the final surface finish.
Construction Methods for Bathroom Walls
1. Complete the leveling of the substrate (concrete surface);
2. Install XPS composite boards and floor drain boards;
3. Lay fiber mesh fabric flat over the joints, then apply Shengtu sealant to fully coat, cover, and smooth the surface;
4. Install the floor drain, and reinforce the floor joints using Shengtu sealant and waterproofing fabric;
5. Upon successful completion of a 48-hour water-retention test, proceed to the next construction stage;
6. Once the sealant has fully dried (approximately 1–2 hours), perform surface finishing and install tiles using the thin-bed method;
7. Clean the wall surface;
8. Use tile adhesive to level the wall surface, bond the Shengtu boards in place, and secure the boards to the substrate wall using mechanical anchors (4 to 6 anchors per square meter);
9. Apply a full coating of 3–5 mm of tile adhesive to the surface of the Shengtu boards, then install wall tiles using the thin-bed method.
Ceiling Installation Methods
1. Install the light-gauge steel keel for the suspended ceiling.
2. Install the XPS composite panels onto the steel keel, securing them in place using threaded fasteners and washers.
3. Seal the joints between the XPS composite panels using Shengtu sealant.
4. Apply fiberglass mesh tape over the joints, then smooth a layer of Shengtu sealant over the mesh tape, as well as over the threaded fasteners and washers.
5. Apply finishing treatments to the ceiling surface, such as skim coating (puttying) and painting.
Basement Construction Methods
1. Level the existing wall surface; then, using cement mortar and mechanical anchors, affix the XPS composite panels to the wall.
2. Level the existing floor surface; then, using cement mortar as an adhesive, lay the XPS composite panels flat on the floor.
3. For the ceiling, refer to standard suspended ceiling construction methods.
4. At the joints, apply fiberglass mesh fabric and Shengtu sealant; use a specialized trowel to scrape the sealant smooth, ensuring it completely covers the fiberglass mesh.
5. Once the sealant has fully dried (approximately 1–2 hours), proceed with the final surface finishing—such as applying putty, followed by painting or hanging wallpaper (or fabric), or using tile adhesive to install ceramic tiles.
Detailed Application Scenarios for Waterproof Composite Boards
Seven Major Series: [Roof Insulation & Thermal Barrier Series] [Interior & Exterior Wall Insulation Series] [Bathroom Leveling & Moisture-Proofing Series] [Basement Moisture-Proofing Series] [Partition Walls & Suspended Ceilings Series] [Kitchen Countertop Series] [Swimming Pool Series]
Shengtu XPS Composite Panels of Various Thicknesses and Their Application Scenarios:
Shengtu XPS composite panels are generally suitable for use on walls constructed from various materials—such as concrete, masonry, or stud framing—and, depending on specific construction objectives, can serve as moisture barriers, thermal insulation layers, or soundproofing layers.
XPS composite panels measuring 40 mm or thicker are suitable for use as thermal insulation for residential roofs;
30 mm XPS composite panels are suitable for use in residential basements or on walls where thermal insulation is required;
20 mm XPS composite panels offer versatile applications: they can be installed on stud framing with 60 cm spacing, or on concrete walls that are difficult to level (utilizing a “dot-and-dab” adhesive method with mortar lumps combined with mechanical anchors to achieve self-leveling); furthermore, they are suitable for encasing pipes, cladding wall-mounted toilet support frames, serving as a substrate for paving sintered stone on stair treads, providing backing for ceramic tile finishes on swimming pool walls, and acting as a stone countertop underlayment in kitchens;
12 mm XPS composite panels can be installed on stud framing with spacing between 30 cm and 40 cm to construct partition walls, room dividers, or suspended ceilings; they can also be applied to residential walls with excellent surface flatness to serve as a backing layer for decorative finishes;
10 mm XPS composite panels are suitable for use in residential suspended ceiling applications.
The 6mm XPS composite board can be used as a backing layer—replacing traditional carpentry boards or OSB—for batten-framed feature walls, and serves as a substrate for the installation of sintered stone slabs
