How to Design the Joint Width When Installing Decorative Panels?

The joint width for installing decorative panels (GRC/UHPC) must be designed along three dimensions: "thermal deformation, panel size, and service environment". Standard scenarios require 8-12mm joints; large temperature differences (≥40℃) or large panels (single panel area >5㎡) require 12-15mm joints; humid environments require 10-15mm joints. Through precise jointing and sealed joint construction design, Qinglong has ensured leak-free, crack-free panel joints on projects such as Sanya Festival Plaza and Nanning Liyuan Hotel, balancing decorative effect with functionality.

I. Joint Widths for Standard Scenarios: Baseline Design Criteria

Standard environments and dimensions use baseline joint widths. Indoor dry environments: small temperature fluctuations (≤20℃), single panel area ≤3㎡, joints 8-10mm — all Qinglong indoor GRG decorative panels are jointed to this standard, producing smooth lines after assembly; standard outdoor environments: temperature fluctuation ≤30℃, single panel area 3-5㎡, joints 10-12mm — the GRC curtain wall at Shenzhen Longhua Xiangshan Science and Technology Park by Qinglong uses 10mm joints, suited to outdoor temperature changes; small decorative lines: line-type components with width ≤300mm, joints 5-8mm — the GRC window frame lines at Zhongshan Kaiyin New Town by Qinglong use 6mm joints without affecting the decorative effect.

II. Joint Widths for Special Scenarios: Targeted Adjustments

Special environments and dimensions require wider joints. Large temperature difference environments: northern winters (temperature difference ≥40℃) or heavily sun-exposed areas, joints 12-15mm to accommodate greater thermal expansion and contraction — GRC panels on a Qinglong project in Harbin use 15mm joints with no compression cracking in winter; large panels: single panel area >5㎡ or length >3m, joints 12-15mm — the 6m-long GRC roof panels at Hainan International Convention and Exhibition Center by Qinglong use 14mm joints, fully releasing deformation; humid/coastal environments: joints 10-15mm to facilitate sealing, waterproofing, and drainage — the coastal Sanya Festival Plaza project by Qinglong uses 12mm joints paired with waterproof sealant, with no leakage risk.

III. Joint Construction and Qinglong Project Practice

Construction design ensures joint functionality is realized. Sealing treatment: neutral weather-resistant silicone sealant (elongation ≥500%) is used to prevent sealant cracking — Qinglong sealant offers excellent compatibility with panels, with bond strength ≥1.0MPa; drainage design: exterior wall joints need drainage slopes (≥3%) or drainage holes — Qinglong reserves a 5mm drainage channel at the bottom of panel joints for rapid rainwater discharge; joint alignment: uniform joint widths (deviation ≤1mm) ensure the decorative effect — Qinglong uses laser-positioned installation, achieving 99% joint uniformity; project case: the colorful openwork GRC panels at Nanning Liyuan Hotel use 12mm joints in an outdoor environment with sealed + drained joint construction, remaining leak-free and deformation-free after years of use.