## 1 Introduction  
Nowadays, composites are used in various industry branches. Combining materials with unique properties allows the optimization of the load-bearing elements and to adapt their strength to the expected loads. The current literature is rich in static studies of composites composed of wood and CFRP, conducted by various research centres around the world. Both strengthening the existing structures and testing newly manufactured elements are carried out. A general review of reinforcing techniques for wooden girders has been presented, for example, by [PERSON] [1] and [PERSON] [2]. Only a cumulative summary of the research conducted on bent beams of full rectangular cross-sections reinforced with CFRP materials, as they most directly concern the topic, is presented in the paper. The first identified method of strengthening the existing structural members is the near-surface mounting of CFRP bars with epoxy glue (Figure 1). Such studies were carried out, among others, by [PERSON] [3] and [PERSON] [4]. Bars can be pre-stressed as well, which was proposed by [PERSON] [5].  
The second way is to reinforce wood with CFRP mats, tapes or strips. This can be done on a variant width of the cross-section, as angles or the letter U (Figure 2). Such reinforcements were analysed, among others, by [PERSON] [6], [PERSON] [7], [PERSON] [8], [PERSON] [9], [PERSON] [10], [PERSON] [11], [PERSON] [12] and [PERSON] [13]. CFRP tapes can be pre-stressed as well, which was investigated by [PERSON] [14,15].  
The last method of strengthening the girders is cutting the cross-section and gluing the CFRP strips into the prepared incisions (Figure 3). This approach was checked by [PERSON] [16], [PERSON] [17] and [PERSON] [18].  
Another group of reinforced wooden elements is beams made by joining wood with CFRP at the stage of their production, by gluing CFRP tapes between wooden lamellas in various arrangements (Figure 4). The necessity to apply an adequate pressure of the composite components to obtain a strong adhesive layer determines using CFRP tapes or strips only. Such studies were carried out, among others, by [PERSON] [19,20], [PERSON] [21], [PERSON] [22], [PERSON] [23] and the author of this paper [24, 25, 26, 27].  
The usefulness of connecting glue laminated timber with fibre reinforced polymers (CFRP), presented in this paper, and benefits of the mechanical performance of the elements are unquestionable. They lead to a high increase in the stiffness and load-bearing capacity of structural members. The research is both current and constantly developed, which proves the significant importance of the topic presented. However, the literature is silent about the production issues and cost profitability of merging these two materials together. The problem in technology is that production lines for classical BSH material should be  
Figure 4: Layouts of wood-CFRP composites combined at the stage of their production.  
Figure 3: Reinforcement layouts using CFRP strips glued in incisions.  
Figure 2: Reinforcement layouts using CFRP mats, tapes or strips.  
improved and partially changed. It is strictly connected with difficulties in cutting materials with completely different properties. Saws used in wood production blunt when twenty times stiffer CFRP material meets their way. Another problem is the blunting of planners when planning side surfaces with a protruding CFRP tape.  
Technological aspects are hard to estimate before performing many empirical tests. However, estimating the cost of load-bearing beams made of wood-CFRP composites, including their mechanical performance and prices of constituent materials, is possible and achieved in the paper.