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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

How long does it take to install XPS extruded polystyrene boards without affecting the subsequent installation of the wood flooring?

How long does it take to install XPS extruded polystyrene boards without affecting the subsequent installation of the wood flooring?

After installation of XPS extruded polystyrene boards, three basic conditions must be met—adequate strength development, stable moisture content, and sufficient interfacial bond—before proceeding with the subsequent wood flooring finish. According to the newly revised “Technical Code for Radiant Heating and Cooling Systems” JGJ 142–2026 issued by the Ministry of Housing and Urban–Rural Development in 2026, when XPS boards are used as both an insulation layer and a leveling substrate in dry underfloor heating systems, their surface bearing capacity must reach a compressive strength of at least 150 kPa prior to flooring installation, and their moisture content must be no greater than 1.2% as determined in accordance with GB/T 10801.2–2023. The actual construction schedule is influenced by ambient temperature and humidity, substrate flatness, adhesive type, and installation procedures; under normal conditions, natural curing for at least 72 hours generally suffices to preliminarily meet the requirements for mechanically fastened wood flooring installation. If full-bonding adhesive installation is employed, it is recommended to wait for at least 120 hours and verify compliance through on-site spot-pressure testing and direct moisture-content measurements using a moisture meter. This assessment directly affects the risks of delamination, warping, and thermal bridging in the finished floor, making it a critical control point in the acceptance inspection of concealed works.

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

Still worried about construction efficiency? This composite insulation panel doubles operators’ productivity!

Still worried about construction efficiency? This composite insulation panel doubles operators’ productivity!

Still troubled by low construction efficiency? Kejia Energy-Saving has developed a high-performance composite insulation board specifically designed to boost productivity. Lightweight yet highly strong, with a low thermal conductivity and easy-to-use installation, it effortlessly doubles on-site efficiency. Whether you’re a corporate decision-maker or a field operator, this innovative product delivers substantial performance gains.

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2026

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