Surface Of Building Materials Research Articles

In-situ characterization of the relative humidity at the surface of building materials

Standardized laboratory testing is normally used for characterization of building materials and components. In real life, especially when assessing buildings in terms of water-damaged building materials, built-in moisture, rising damp or other problems, information on the hygrothermal state of the constructions may be relevant, but is often sparse. This paper presents a study where application of a newly developed non-destructive experimental method is used to measure the relative humidity (RH) at the surface of four types of building materials. Knowing the RH at the surface, a risk assessment of fungal growth can be made. The materials include concrete, brick, aerated concrete, and gypsum, with and without a surface treatment. The method is based on the idea of establishing a water vapor transport towards equilibrium within a small air volume in contact with the surface of interest. In the laboratory the specimens were conditioned at respectively 65 % RH and 90 % RH in a climate chamber, and then transferred to conditions with 50 % RH. The open side of a Petri dish, equipped with a temperature and relative humidity sensor, was attached to the materials using reusable adhesive. The development of the relative humidity over time within the petri dish was monitored and parameterized mathematically, solving an exponential rate equation. The parameterization and certain sets of assumptions allow among other things a calculation of time to equilibrium which makes it possible to assess the reproducibility and comparison in between materials. As the materials were tested with and without surface treatment, it was possible to estimate the effect of a typical surface treatment on the moisture transport. The measurements compared well to simulations made by a model, though the model predicts slightly faster achievement of equilibrium. Despite the limited number of cases in the current study, the presented results are promising with regards to enable rough estimates of RH at the surface of building materials outside the laboratory with a very simple, inexpensive, and non-destructive method.

Hydrophobic Nano-Microcapsules Effectively Improve the Waterproof Performance of Coatings

Due to the special surface wettability, self-cleaning, drag reduction, anti-icing and other properties, superhydrophobic materials are widely used as coating or coating additive on the surface of building materials, ships, and even for liquid transportation, biomedicine, etc., which have become one of the research hotspots in the direction of coating in recent years. However, the hydrophobic surface itself has weak stability and poor durability, which affects its application value. Therefore, in this study, PS nano-microcapsule was prepared by the multiphase emulsion method, and their particle size was measured by SEM electron microscopy to be about 350–550 nm, with a relatively uniform distribution. The hydrophobicity of PS nano-microcapsule modified with trimethoxy (1H, 1H, 2H, 2H-trifluoroctyl) silane (PFOTMS) at different molar ratios was investigated. SEM results showed that the surface roughness of the modified PFOTMS-PS nano-microcapsule could be changed. The contact angle proved that the greater the content of PFOTMS, the better the hydrophobicity of the modified PFOTMS-PS nano-microcapsule. When the content reached 50%, the hydrophobic performance was the best. As a coating, PFOTMS-PS nano-microcapsule has no specific requirement for the properties of the substrate material. It should be noted that the hydrophobicity of the coating did not change significantly after 30 days at room temperature. The above results indicated that PFOTMS-PS nano-microcapsule had good hydrophobicity and stability, and is expected to be used in many fields such as waterproof textiles and architectural coatings in the future.

Grey image recognition-based mold growth assessment on the surface of typical building materials responding to dynamic thermal conditions

Mold growth on building materials poses a threat to both the building structural integrity and occupants’ well-being. However, it is generally studied under suitable conditions in laboratory; the assessment is based on visual inspection but lacks an objective criterion. This research explored the effects of simulated dynamic thermal conditions on mold growth on three typical building materials artificially contaminated with Aspergillus niger spores. Test specimens were assessed based on a developed digital image-based method, where image segmentation, processing, and greyscale recognition via the OpenCV visual library were introduced. The results showed that the high temperature-high humidity condition in a 24-h cyclic change facilitated mold growth on the surfaces of three materials, especially for gypsum board, with an identified area proportion of 1.13% on the 80th day. This was consistent with the changes of the counted number of mold colonies, and no significant differences were found among the gypsum board, latex paint, and wallpaper. The growth extents of mold spores were objectively evaluated by the mean greyscale values; the values decreased gradually with time, and the decrements were different compared high-temperature to low-temperature conditions. The mold growth models were developed, where the area proportion of mold growth was linearly related to the counted colonies and greyscale values under different material surfaces. This novel grey image recognition-based method provides an accurate means of evaluating mold growth abilities and extents, overcoming the inaccuracy of visual observation. The findings have significant implications for visual inspection, mold prediction, and building management.

Comparison of Photocatalytic Biocidal Activity of TiO2, ZnO and Au/ZnO on Escherichia coli and on Aspergillus niger under Light Intensity Close to Real-Life Conditions

Microbial contamination of the surface of building materials and subsequent release of microbial particles into the air can significantly affect indoor air quality. Avoiding the development or, at least, reducing the quantity of microorganisms growing on building materials is a key point to reduce health risks for building occupiers. In that context, the antimicrobial activity of TiO2, ZnO and Au/ZnO was assessed by measuring log reductions of Escherichia coli and Aspergillus niger populations both in the dark and under a light intensity close to real-life conditions. The bactericidal activities (≥2.3 log reduction) of tested products were stronger than their fungicidal activities (≤1.4 log reduction) after 2 h of contact. Different parameters including concentration of photocatalyst, intensity of light (dark vs. 5 W/m2 UV-A), and duration of contact between photocatalyst and microbial cells and spores were investigated. Results of this study confirmed bactericidal activities of TiO2, ZnO and AuZnO on E. coli and brought new insight on their fungicidal activity on the spores of A. niger. They also confirmed the greatest antimicrobial efficiency of ZnO compared to TiO2 and its increased photocatalytic activity when decorated with Au, leading to the highest log reductions detected after 2 h of contact for both tested microorganisms (4 and 1.4 for E. coli and A. niger, respectively). The antimicrobial activity was enhanced by the duration of contact between microorganisms and nanoparticles of the different tested photocatalytic products.

Semantic segmentation of urban building surface materials using multi-scale contextual attention network

Distributed solar photovoltaic (PV) harvesting is an effective way to collect solar energy in existing metropolitan cities. To facilitate the installation of PV modules at solar abundant locations, an accurate estimation of solar PV spatial potential is indispensable. Solar energy could be reflected on high-albedo building surfaces inside the urban canyon. However, using conventional ways to construct albedo datasets for different building surfaces is extremely labor-intense. In this work, we proposed to use semantic segmentation to identify façade materials from street view images. Due to the distinguishable features between materials in terms of the subtle texture and patterns rather than just their shapes and colors, identification requires more details from images, which makes multi-scale inference structure a promising solution. Compared with existing methods combining scales features at pixel-level, we proposed a novel Multi-Scale Contextual Attention Network (MSCA), using a Multi-Scale Object-Contextual Representation (OCR) block to exploit and combine contextual information from different scales in high dimensional layers. The experimental results show that the proposed model significantly outperforms the existing models, achieving a mean Intersection over Union (mIOU) of 70.23%. The results indicate that the MSCA can effectively obtain the materials information from street views and can be a reliable solution to providing urban albedo information for solar estimation.

Representing the photobiological dimension of light in northern architecture

Daylight can enhance the quality and inhabitability of architecture through a better relationship with the exterior environment, especially by its intensity, chromaticity and ability to synchronize the human circadian clock. Daylight integration in architecture remains a challenge in Nunavik (Quebec, Canada) due to its subarctic climate, photoperiod and solar geometry. The objective of this research is to implement photobiological metrics of light in architectural representations by isolating the photopic (daytime vision) and melanopic (circadian clock) portions of the electromagnetic spectrum, and to spatialize daylight and artificial light in relation to landscapes and indoor architectural spaces. An automated and low-cost capture tool based on Raspberry Pi microcomputers and Camera Modules (RPiCM) captures high dynamic range images, which accurately measure luminance to render human perception. Absolute photopic luminance maps (cd/m2) are supplemented with false colour displays of photopic/melanopic contents of light regarding building surface materials. The research develops photometric captures of absolute photopic and melanopic illuminance (lux, EML). Photobiological metrics of light are integrated into a set of physical properties of lighting patterns to perform light assessments and are ultimately represented as a graphical display to help designers and researchers to evaluate architectural interior–exterior relationships through daylight qualities.

Releases of micropollutants from building surface materials into rainwater and snowmelt induced runoff

Building surface materials, exposed to wash-off by rainwater or snowmelt, are recognised as one of the significant urban diffuse pollution sources contributing to the impairment of stormwater quality. The pollution conveyed by roof runoff originates from two potential sources, migration of surface material constituents, or wash-off of pollutants deposited on the surface by atmospheric deposition. This study investigated the releases of metals and several groups of contaminants of emerging concern: alkylphenols, alkylphenol ethoxylates, and phthalates, from commercially available materials, which are commonly used on buildings and structure surfaces in the urban environment. The materials tested included the following: metal sheets of stainless steel, copper, zinc, galvanised steel, corten steel, corrugated and coated steel, coated zinc; and bitumen-based roofing felt and shingles, as well as polyvinyl chloride (PVC) from two manufacturers. The stainless steel was considered a control material serving to estimate pollutant contributions deposited on the pilot panels from the surrounding environment. Moreover, this study presents novel data on roof snowmelt induced runoff quality, not reported in the previous literature. The experimental setup consisted of 2-m2 rectangular panels mounted in triplicates of each material and placed in an open-air setting on the campus of Luleå University of Technology, Sweden. Runoff leaving the gently sloping material panels was collected during 11 rain and three snowmelt driven runoff events occurring over a five-year period. The results showed that, in general, the micropollutant concentrations and loads were lower in snowmelt than rain induced runoff, and no decreasing trend was detected in the releases of phthalates or metals during the study period. Moreover, on a yearly basis, copper sheets were estimated to release 0.6 g/m2 Cu to runoff, zinc and galvanised sheets 1.3 and 0.7 g/m2 Zn, respectively, and, PVC sheets were estimated to release up to 78 mg/m2 of diisononyl phthalate (DINP).

Fungal Contamination of Building Materials and the Aerosolization of Particles and Toxins in Indoor Air and Their Associated Risks to Health: A Review.

It is now well established that biological pollution is a major cause of the degradation of indoor air quality. It has been shown that microbial communities from the outdoors may significantly impact the communities detected indoors. One can reasonably assume that the fungal contamination of the surfaces of building materials and their release into indoor air may also significantly impact indoor air quality. Fungi are well known as common contaminants of the indoor environment with the ability to grow on many types of building materials and to subsequently release biological particles into the indoor air. The aerosolization of allergenic compounds or mycotoxins borne by fungal particles or vehiculated by dust may have a direct impact on the occupant's health. However, to date, very few studies have investigated such an impact. The present paper reviewed the available data on indoor fungal contamination in different types of buildings with the aim of highlighting the direct connections between the growth on indoor building materials and the degradation of indoor air quality through the aerosolization of mycotoxins. Some studies showed that average airborne fungal spore concentrations were higher in buildings where mould was a contaminant than in normal buildings and that there was a strong association between fungal contamination and health problems for occupants. In addition, the most frequent fungal species on surfaces are also those most commonly identified in indoor air, regardless the geographical location in Europe or the USA. Some fungal species contaminating the indoors may be dangerous for human health as they produce mycotoxins. These contaminants, when aerosolized with fungal particles, can be inhaled and may endanger human health. However, it appears that more work is needed to characterize the direct impact of surface contamination on the airborne fungal particle concentration. In addition, fungal species growing in buildings and their known mycotoxins are different from those contaminating foods. This is why further in situ studies to identify fungal contaminants at the species level and to quantify their average concentration on both surfaces and in the air are needed to be better predict health risks due to mycotoxin aerosolization.

Comprehensive Review of Recent Research Advances on Flame-Retardant Coatings for Building Materials: Chemical Ingredients, Micromorphology, and Processing Techniques

Developing fire-retardant building materials is vital in reducing fire loss. The design and preparation of novel fire-retardant coatings merely require the adhesion of flame retardants with high fire-retardant characteristics on the surface, which is significantly more economical than adding excessive amounts of flame retardants into bulk building materials. Meanwhile, fire-retardant coating has excellent performance because it can block the self-sustaining mechanisms of heat and mass transfer over combustion interfaces. In recent years, research of fire-retardant coatings for building materials has been subject to rapid development, and a variety of novel environmentally benign fire-retardant coatings have been reported. Nonetheless, as the surface characteristics of various flammable building materials are contrastively different, selecting chemical ingredients and controlling the physical morphology of fire-retardant coatings for specific building materials is rather complicated. Thus, it is urgent to review the ideas and preparation methods for new fire-retardant coatings. This paper summarizes the latest research progress of fire-retardant building materials, focusing on the compositions and performances of fire-retardant coatings, as well as the principles of their bottom-up design and preparation methods on the surface of building materials.

Past-expiration-date liquid disinfectants to deactivate biological and chemical toxins on building material surfaces.

In this study, we evaluated the deactivating efficacy of strong basicity-based (T4-102) and hydrogen peroxide-based (DF-200) disinfectants that were past their expiration date when used to deactivate biological and chemical toxins on building material surfaces. The decontamination efficacies of DF-200 and T4-102 disinfectants against dimethyl methylphosphonate (DMMP) and 2-chloroethyl ethylsulfide (2-CEES) were studied using GC-MS analysis. The bactericidal efficacies of disinfectants against Gram-negative E. coli and P. aeruginosa, and Gram-positive B. subtilis and S. aureus, were assessed in terms of the zone of inhibition, minimum inhibitory concentration (MIC), and minimum bactericidal concentration (MBC). The results indicated that the deactivation efficacy varied significantly according to the disinfectant amount, contact time, and building material. Higher efficacy of up to 99-100% was observed for biological toxins, despite passing their expiration dates. Approximately 70-78% of deactivation efficacies were observed for disinfectants against DMMP on the tile coupon at 100 μL and 24 h contact time. Moreover, the deactivation efficacy of DF-200 was better than that of T4-102. The data presented here demonstrate that the responders may use past-expiration-date disinfectants for efficacious disinfectaion in large-scale contamination incidents.

ЗАЩИТА ФАСАДОВ ОБЪЕКТОВ КУЛЬТУРНОГО НАСЛЕДИЯ ОТ ВОЗДЕЙСТВИЯ КОСОГО ДОЖДЯ: ОБЗОР ЭКСПЕРИМЕНТАЛЬНЫХ ИССЛЕДОВАНИЙ

The relevance of the study is due to the fact that erosion of the surface of building materials is a common phenomenon observed on the facades of historic buildings. Climatic changes can lead to an increase in the frequency and intensity of extreme precipitation, which can increase the erosion effects on the facades of buildings due to the wind-driven rain. The purpose of the study is to compare experimental methods for assessing the degree of surface erosion of historic building materials under the influence of wind-driven rainfall. The objectives of the study are to review modern methods for measuring the effect of rain with wind on the surface erosion and reduction of the strength of brick and limestone; to critically analyze the best-known methods for assessing the degree of erosion of the surface of building materials; to offer recommendations for the protection and restoration of damaged facades of cultural heritage objects due to the wind-driven rain. The significance of the obtained results for architects and designers is that the use of methods to assess the degree of damage to the facades of architectural monuments due to wind-driven rainfall makes it possible to monitor and develop measures to protect objects of cultural heritage.

Investigation of façade coatings containing algae-prone fillers

Abstract Algae are an evolutionary model of success and colonize all suitable ecological niches including building material surfaces that have favorable characteristics. In the last 25 years, building physics measures were developed to reduce water availability, especially on external thermal insulation composite systems. Investigations into the influence of coating formulations have so far primarily focused on binder systems, biocides and hygrothermal properties. Research on the algal susceptibility due to the fillers is not to be found, but these regularly constitute a large proportion of final coatings. The present work investigates the influence of magnesium-containing fillers in the process of algal colonization of free-weathered façade coatings and a defense-strategy by water-activated pigment composition.

Comparison of multidimensional mass transfer models of formaldehyde emissions originating from different surfaces of wood-based panels

Indoor decoration causes a large amount of formaldehyde to be concurrently released from different surfaces of wood-based panels. However, this phenomenon has rarely been described with two- or three-dimensional mass transfer models. In this paper, multidimensional mass transfer models of formaldehyde emissions originating from different surfaces of building materials are first established. Moreover, mass balance integral equation is introduced. Experiments of formaldehyde emissions in the environmental chambers are numerically simulated by combining the parameter estimation method, composite Simpson formula and finite difference method, whose convergence and stability are verified. The results indicated that the proposed models suitably agreed with the experimental and literature data. Furthermore, the multidimensional mass transfer model confirmed that formaldehyde released from sides should not be ignored. Compared with the one-dimensional model, the three-dimensional model can more accurately simulate the release data of formaldehyde from wood-based panels. Subsequently, the variation trend between the chemical reaction formation rate and physical diffusion rate of formaldehyde is revealed.

Renovation of Modernist Architecture Study Based on Selected Cases

Modernist architecture is one of the most significant movements which serve as grounds for contemporary creations. At the beginning of the 20th century, the impact of new structural and building technologies allowed designers to find new ways of architectural expression. It is rooted in thought-out composition and simplicity which serve as a background for the exposition of structure. The geometrical interplay of a building’s elements highlights the impressively thin structures and raw surfaces of novel building materials. Nowadays, in selected regions, the architecture of the Modernist Period is neglected or loosely refurbished. As an effect of this phenomenon, buildings are demolished or deprived of aesthetical values. Thus, this article aims at showing an overview of sectional research on good practice. We base the study of on-site design implementations of several modernist architecture refurbishments and focus on technology and design assumptions with optimised thermal modernisation. The paper reveals a set of examples for the refurbishment of modernist architecture, with calculations of heat energy coefficients of the initial and design phase. The presented thermal modernisations aim at adjusting buildings to new requirements concerning energy without any loss of initial architectural expression.

On-site detection of asbestos at the surface of building materials wasted at disaster sites by staining.

We have developed a method to detect asbestos by staining the surface of building materials in order to quickly detect asbestos-containing building materials at disaster sites. After staining, asbestos was easily detected by the color and characteristic shape of the images observed under a stereomicroscope. The type of asbestos was confirmed to be chrysotile by polarized light microscopy, X-ray diffraction patterns, and Raman spectra. The percentage of the area of asbestos at the surface of building materials was also determined by an image analyzer after the dye staining, and the distribution percentage of asbestos increased with its total concentration in the building material. Three-dimensional X-ray computed tomography images showed that asbestos was mainly distributed at the surface of building materials. This result suggests that the asbestos at the surface of debris of building materials is more easily and sensitively detected than total asbestos analysis by pulverization. The present method was applied to detect and determine asbestos in debris of building materials wasted at temporary storage sites after disaster and on the wall of a building in use. Therefore, this method can contribute to the classification of asbestos-containing and non-asbestos-containing building materials at disaster sites and demolition sites, as well as to preliminary inspections for the detection of asbestos-containing building materials before demolition of houses and buildings.

Physical and mechanical properties of the surface of pine wood modified with an organomineral composition

The percentage of wooden buildings damaged or even lost due to the lack or insufficient technical measures for their preservation is growing every year. This fact makes it mandatory to treat the surface of wood building materials with protective and decorative agents. Within the framework of this study, a multifunctional protective composition for wood was developed that can increase its physical and mechanical properties. Modification of the wood surface with organomineral compositions leads to an increase in its density, hardness and strength. The hardness of the treated wood is 24% higher and the compressive strength along the fiber is 20% higher than that of untreated wood. After treatment, the surface of the wood darkened and slightly yellowed, which does not prevent its use in the construction and reconstruction of buildings. The results of measuring the color coordinates of the surface of the modified samples indicate the stability and durability of the developed protective coating even after 4 months of exposure to atmospheric conditions. Judging by the slight return of the color coordinates of the treated wood back to values of the original wood, it can be concluded that the composition is partially washed out.

Ni0.6Zn0.4Fe2O4/Ti3C2Tx nanocomposite modified epoxy resin coating for improved microwave absorption and impermeability on cement mortar

With the rapid development of wireless technology, electromagnetic interference and pollution have been a serious harmful problem to human health. Therefore, it is greatly significant to design and explore efficient electromagnetic wave (EMW) absorbing coatings on the surface of devices, mortar or other building materials. In this paper, a series of novel Ni0.6Zn0.4Fe2O4/Ti3C2Tx nanocomposite modified epoxy resins with different additive content were successfully prepared to serve as absorbing and anticorrosive coating on cement mortar. The effect of the content of Ni0.6Zn0.4Fe2O4/Ti3C2Tx nanocomposite in epoxy resin as coatings of cement mortar on mechanical properties, interfacial bonding ability, corrosion performances and reflectivity performances was detailly investigated. Apparently, when 3% Ni0.6Zn0.4Fe2O4/Ti3C2Tx nanocomposite is added into epoxy resin, the cement mortar with modified coatings exhibits the most excellent EMW absorption properties, whose the minimum reflectivity is −34.39 dB, the absorption bandwidth with reflectivity lower than − 10 dB is about 8.96 GHz. Besides, both capillary sorptivity and chloride penetration tests demonstrated that the impermeability of water and chloride ions of cement mortar coated by modified epoxy coatings was obviously improved with the increase of Ni0.6Zn0.4Fe2O4/Ti3C2Tx nanocomposite compared to cement mortar without coatings and with pure epoxy resin coating. In particular, the optimized modified epoxy resin with 3% dosage of Ni0.6Zn0.4Fe2O4/Ti3C2Tx nanocomposite also displays the lowest capillary sorptivity and chloride permeability. Our findings proved that the use of Ni0.6Zn0.4Fe2O4/Ti3C2Tx nanocomposite modified epoxy resin as coatings of cement mortar provides a viable source for solving electromagnetic pollution and impermeability problems in military and civilian applications.

Comparison of three explorative methods for identifying building surface materials contributing pollutants to stormwater

Runoff from building and structure surfaces may contribute to the pollution of urban stormwater and, thereby, to the degradation of the receiving water quality. Various micropollutants have been found in surface runoff from buildings in the urban environment, including metals and organic micropollutants. Effective methods for identification of such pollutants and their sources are the prerequisites for the development of control measures. In this paper, three different methods for the identification of building surface materials acting as sources of metals (Cd, Cr, Cu, Ni, Pb and Zn), nonylphenols and phthalates are presented: (i) screening of the material composition, (ii) laboratory leaching experiments with synthetic rainwater, and (iii) open-air pilot testing of material panels exposed to actual rainfall and runoff. These three methods cover a wide span of experimental aspects, including, e.g., size of material samples, resource demands, and control of influential factors. Nine materials commonly used on building and structure surfaces in the urban environment were tested: metal sheets of zinc, copper, galvanised steel, coated corrugated steel and stainless steel; and, four different roofing membranes of bitumen as well as polyvinyl chloride (PVC). The experimental results indicated that all three methods were meritorious in providing some information contributing to the identification of pollutant sources. The screening of material composition for targeted pollutants is relatively quick and inexpensive, but may fail to identify minor sources of pollutants, or may identify the substances present in the material, but not released in contact with water. Laboratory leaching was generally effective in identifying sources of substances present in surface runoff, but was unsuitable for estimating the magnitude of actual concentrations in building runoff. Open-air pilot studies of material samples (exposed area = 2 m2) were thought to provide the results corresponding well to concentrations in runoff from actual building surfaces, but required relatively large financial and labour resources. Thus, the choice of the method for pollutant identification should be based on study objectives, and some benefits may be achieved using more than one method in an integrated manner; e.g., composition screening and lab or open-air leaching of targeted materials.

Thermal Insulation Of The Foundation Walls Of Buildings And Calculation Of Its Thickness

If the surface temperature of any building material drops sharply without changing the humidity and the surface temperature is lower than the dew point temperature, dew-like water droplets are formed on the surface of this material. This condition is called condensing humidity condition. Condensation moisture formed on the surfaces of building materials and external barriers is slowly absorbed into the body of building materials over time, increasing the relative humidity of this structure. Condensation moisture can be observed when the temperature of the surfaces of external barrier structures drops sharply. This condition can be observed everywhere where the basement is connected to the outer walls of the basement. The article deals with the issue of thermal insulation and calculation of basement walls of modern energy-efficient buildings, which are widely used in the country and abroad.

Investigation of the Inhibitory Effect of Biocidal Products (Based on Guanidine) on the Activity of Building Materials Destructors

The article presents the classification and specificity of effective methods of protection from bio-damage. Settling on the surface of building materials and structures, microorganisms, along with the destructive effect, worsen the environmental situation in buildings and structures.Studying the works of Russian and foreign authors in the field of biotechnology made it possible to generalize the basic methods of combating biological damage to KSM (carbamide resin), which are divided into physical, biological and chemical.One of the most effective and long — lasting ways to protect building materials and structures from damage by microorganisms is the use of biocidal compounds. The latter are introduced into the composition of the material during its manufacture or by the method of impregnation. Fungicides also inhibit the development of microorganisms by reducing the intake of nutrients from the environment to the cells of the fungus.In world practice, promising biocidal compounds are considered to be preparations based on guanidine, which are effectively used in medicine, the textile industry, in chemical technologies for the synthesis of surfactants, etc. In this article, the inhibitory effect of the preparation “Teflex” (base - polyethylene guanidine) on the activity of exoxidoreductases of fungi destructors of construction composites (Aspergillus fumigatus, Stemphylium verruculosum, Trichoderma koningii and Paecilomyces carneu)s at the maximum of enzymatic activity was evaluated. Biocides were introduced into the fungi culture medium on day 3 (in vivo).It was found that “Teflex” fungicides inhibit phenolosidotoses, cotoloses and peroxidoses: phenol oxidases of the fungus Aspergillus fumigatus - 1.4 times, Paecilomyces carneus - 1.6 times, Trichoderma koningii - 2.0 times, Stemphylium verruculosum - 4.2 times (Figure 7.1 A); catalases of the fungus Paecilomyces carneus - 1.8 times, Trichoderma koningii - 2.2 times, Stemphylium verruculosum - 9.3 times, Aspergillus fumigatus - 23.9 times (Figure 7.1 b); peroxidases of the fungus Aspergillus fumigatus - 3.4 times, Trichoderma koningii-4.6 times, Paecilomyces carneus-9.9 times, Stemphylium verruculosum - 43.7 times. The fungicidal effect of the preparation “Teflex” may be associated with its destabilizing effect on the native structure of enzymes. It leads to a violation of the tertiary structure of the enzyme, causes protein denaturation and disorganization of the cell membrane.