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When installing a dry underfloor heating system using XPS extruded polystyrene boards on a wooden joist subfloor, is a board thickness of 20 mm or 30 mm more reliable? This involves considerations of floor deformation risk and the minimum thermal resistance requirement stipulated in the 2026 Code for Thermal Design of Civil Buildings.

When installing a dry underfloor heating system using XPS extruded polystyrene boards on a wooden joist subfloor, is a board thickness of 20 mm or 30 mm more reliable? This involves considerations of floor deformation risk and the minimum thermal resistance requirement stipulated in the 2026 Code for Thermal Design of Civil Buildings.

When installing XPS extruded polystyrene boards on a wooden joist subfloor for a dry-installation underfloor heating system, the choice between 20 mm and 30 mm thickness should not be based solely on experience or cost considerations.

25

2026

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03

After the installation of XPS extruded polystyrene boards, tile delamination and cracking have occurred. Could this be due to excessive moisture content in the substrate or failure to apply a bonding treatment?

After the installation of XPS extruded polystyrene boards, tile delamination and cracking have occurred. Could this be due to excessive moisture content in the substrate or failure to apply a bonding treatment?

Clause 5.3.2 of the “Acceptance Code for Dry-Installed Underfloor Heating Systems” (JGJ 142–2026), which came into effect in 2026, explicitly stipulates that the thermal insulation layer must be reliably bonded to or mechanically anchored to the structural floor slab, and that the moisture content of the substrate shall not exceed 8% as determined in accordance with Appendix B of GB/T 50082–2026, “Standard Test Methods for Long-Term Performance and Durability of Ordinary Concrete.” Furthermore, Clause 6.1.4 specifies that when using non-absorbent XPS-type thermal insulation materials, a dedicated interface-enhancing layer must be provided; otherwise, work on the finishing layer shall not proceed. At its core, this issue arises from the coupled failure of multiple factors—namely, material compatibility, the integrity of the construction detailing, and compliance with the sequence of construction operations—rather than being caused by a single parameter exceeding its specified limit.

25

2026

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03

Why is XPS insulation board the first choice for underfloor heating? Unveiling its outstanding performance.

Why is XPS insulation board the first choice for underfloor heating? Unveiling its outstanding performance.

In the field of architectural decorative materials, XPS insulation boards have increasingly become the material of choice for underfloor heating systems due to their outstanding thermal insulation performance and compressive strength. This article provides an in-depth examination of the core advantages, technical specifications, and market applications of XPS insulation boards, offering a comprehensive reference for end-users, business analysts, and corporate decision-makers.

23

2026

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01

XPS Board Buying Guide: Five Key Considerations for Corporate Decision-Makers

XPS Board Buying Guide: Five Key Considerations for Corporate Decision-Makers

Extruded polystyrene (XPS) is a closed-cell rigid foam board manufactured from polystyrene resin via a high-temperature extrusion process. Its honeycomb structure effectively inhibits air convection, resulting in a thermal conductivity as low as 0.028–0.032 W/(m·K)—significantly superior to that of conventional EPS materials. Today, XPS insulation is widely used in exterior wall thermal insulation, underfloor heating insulation layers, cold-storage projects, and other applications, accounting for more than 75% of the underfloor heating insulation board market, according to data from the 2023 China Building Insulation Industry White Paper.

23

2026

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01

Why is XPS insulation board the first choice for underfloor heating? Unveiling its outstanding performance.

Why is XPS insulation board the first choice for underfloor heating? Unveiling its outstanding performance.

In the field of architectural decorative materials, XPS insulation boards have increasingly become the material of choice for underfloor heating systems due to their outstanding thermal insulation performance and compressive strength. This article provides an in-depth examination of the core advantages, technical specifications, and market applications of XPS insulation boards, offering a comprehensive reference for end-users, business analysts, and corporate decision-makers.

23

2026

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01

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