The article discusses the use of larch wood in wooden elements of a composite section on pliable bonds in the form of oblique metal rods (IRS compounds). The test results of samples of IRS compounds from larch wood on inclined screwed rods are presented. The upper boundary of the region of elastic work of IRS compounds from larch wood and deformation of compounds are determined. A comparative assessment of the bearing capacity and deformability of IRS compounds on screwed rods made of pine wooden elements and larch wood is performed. Based on the test results of compounds, the calculations of bending elements of a composite section with a span of 6 m were performed using the theory of composite rods by A. R. Rzhanitsyn. The effectiveness of the use of larch wood in supporting structures made of solid wood is shown.