Engineering Method for Calculating Air Noise Insulation of Cross-Laminated Timber Construction

A method for calculating the sound insulation of Cross-Laminated Timber (CLT) based on the results of an experimental study of sound insulation of CLT of various thicknesses is presented to supplement paragraph 9.1 of SP 275.1325800.2016. The insulation of air noise from CLT panels with a thickness of 60, 100 and 160 mm was determined according to GOST 27296–2012 in certified FSUE “All-Russian Scientific Research Institute of Physico-Technical and Radio Technical Measurements” at the test facility “Reverberation rooms for measuring air noise insulation by enclosing structures in laboratory conditions” of Vologda State University. The method of calculating the sound insulation of CLT panels is adopted similar to the current method of determining sound insulation based on regulatory documents for the coordinate of point B in terms of the frequency of wave coincidence or critical frequency. For engineering calculations of sound insulation of single-layer fences, the abscissa of point B can be taken equal to 45,000 divided by the thickness of the fence. The ordinate of point B should be determined by formulas 4.5 SP 275, where the value of the coefficient K can be taken from the results of measuring the sound insulation of CLT panels of various thicknesses. When measuring the sound insulation of CLT panels, the K value was clarified. As a result, the average coefficient value was assumed to be K=3.6 for thin CLT panels and K=2.6 for panels with a thickness of more than 100 mm. The sound insulation values have two segments: to the left of point B – horizontal, to the right – inclined with a rise of 6 dB per octave. Calculated and measured graphs of air noise insulation for CLT panels with a thickness of 60, 100, 160 mm are presented, according to the results of which it can be concluded that the proposed engineering method for calculating sound insulation gives a completely satisfactory result.

N.A. KOCHKIN¹, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
S.N. OVSYANNIKOV², Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
I.L. SHUBIN³, Correspondent Мember of RAACS, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
A.A. KOCHKIN¹, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ Vologda State University (15, Lenin Street, Vologda, 160000, Russian Federation)
² Tomsk State University of Architecture and Civil Engineering (2, Solyanaya Square, Tomsk, 634003, Russian Federation)
³ Scientific-Research Institute of Building Physics of the Russian Academy Architecture and Construction Sciences (21, Lokomotivniy Driveway, Moscow, 127238, Russian Federation)

1. Gradova O.V., Rogalev A.M. Improvement of shock noise insulation by elastic gaskets in floating floor structures. Stroitel’nye Materialy [Construction Materials]. 2024. No. 6, pp. 26–29. (In Russian). EDN: ­AHNSYJ. https://doi.org/10.31659/0585-430X-2024-825-6-26-29
2. Kochkin N.A., Ivanova A.V., Shubin I.L., Kochkin A.A. Study of factors influencing sound insulation existing fences with additional sound insulation at the site using layered vibration-damped elements. Stroitel’nye Materialy [Construction Materials]. 2024. No. 6, pp. 40–45. (In Russian). EDN: ­XFAHAO. https://doi.org/10.31659/0585-430X-2024-825-6-40-45
3. Antonov А.I., Gusev V.P., Ledenev V.I., Matveeva I.V., Shubin I.L. Calculations of the acoustic efficiency of noise shields based on the numerical solution of the sound diffraction equation. Zhilishchnoe Stroitel’stvo [Housing Construction]. 2024. No. 6, pp. 10–15. (In Russian). EDN: ­SUEXUU. https://doi.org/10.31659/0044-4472-2024-6-10-15
4. Kuzmin D.S., Monich D.V., Grebnev P.A., Porozhenko М.А. Аssessment of the rationality of design solutions of sound-insulating lightweight partitions with shotcreted claddings. Zhilishchnoe Stroitel’stvo [Housing Construction]. 2024. No. 6, pp. 16–20. (In Russian). EDN: ­EUULRN. https://doi.org/10.31659/0044-4472-2024-6-16-20
5. Kuzmin D.S., Monich D.V., Grebnev P.A., Porozhenko M.A. Ways to increase of sound insulation of light partitions with shotcrete claddings. Zhilishchnoe Stroitel’stvo [Housing Construction]. 2023. No. 7, pp. 10–16. (In Russian). EDN: ­LQQRFD. https://doi.org/10.31659/0044-4472-2023-7-10-16
6. Kochkin N.A., Ivanova A.V., Shubin LL., Kochkin A.A. Studies of sound insulation of fences with a flexible slab on the offset from layered elements. Zhilishchnoe Stroitefstvo [Housing Construction], 2023. No. 7, pp. 3–9. (In Russian). EDN: ­CYGRZZ. https://doi.org/10.31659/0044-4472-2023-7-3-9
7. Shchirzhetskiy Kh.A., Soukhov V.N. Calculation of sound absorption in the design of noise protection of rooms with high background noise and distributed noise sources. Zhilishchnoe Stroitel’stvo [Housing Construction]. 2023. No. 7, pp. 17–20. (In Russian). EDN: ­TGZAHQ. https://doi.org/10.31659/0044-4472-2023-7-17-20
8. Kryshov S.I., Kotelnikov D.E., Gradova O.V. Anti-rating of structural floor solutions for shock noise insulation. Zhilishchnoe Stroitel’stvo [Housing Construction]. 2024. No. 6, pp. 21–24. (In Russian). EDN: ­WQHTED.
https://doi.org/10.31659/0044-4472-2024-6-21-24
9. Monich D.V. Sound insulation of lightweight multilayer enclosing structures. Doctor Diss. (Engineering). Moscow. 2022. 376 p. (In Russian). EDN: ­EBPYUP
10. Grechishkin A.V., Antonov A.I., Ledenev V.I., Matveeva I.V. Experimental evaluation of a combined method for calculating pulsed noise propagating in a room. Regional’naya Arkhitektura i Stroitel’stvo. 2024. No. 3 (60), pp. 214–222. EDN: ­IVCAMR. https://doi.org/10.54734/20722958_2024_3_214