Efficiency assessment of posterior waterproofing systems of renovated porous limestone masonry work

Abstract

Original scientific paper Buildings in need of renovation also show typical substructural damages due to aged waterproofing. An often used reconstruction method against capillary rising damp is chemical penetration of masonry walls through injection boreholes, but the efficiency of this technology depends on the material of the wall. Surface coating and renovation plaster give additional moisture protection and together with the chemical injection based horizontal waterproofing provide a complete solution system. Analysis of posterior waterproofing of the soft limestone, a widespread building material of the previous centuries, is required due to its high porosity. In this paper, based on the results of the measurements of an insulated soft limestone masonry building, the effectiveness of the waterproofing system has been evaluated. The measured humidity data also gave opportunity to further research, so thermal and hygrothermal analysis and building-physical comparisons have been performed. Keywords: chemical injection; energy efficiency; hygrothermal behaviour; limestone masonry; reconstruction; renovation plaster; rising damp Procjena učinkovitosti posteriornih vodootpornih sustava renovirane građevine od poroznog vapnencaIzvorni znanstveni članak Zgrade kojima je potrebna obnova također pokazuju tipična oštećenja temelja zbog zastarjelog vodootpornog sustava. Često primijenjena metoda rekonstrukcije protiv vlage nastale kapilarnim prodiranjem podzemne vode je zaštita zidova zgrade uštrcavanjem kemijskih sredstava, ali učinkovitost te tehnologije ovisi o materijalu zida. Premazivanje površine i žbuka pružaju dodatnu zaštitu od vlage te uz horizontalnu zaštitu od vode uštrcavanjem kemijskih sredstava predstavljaju potpuno rješenje sustava zaštite. Analiza posteriornog vodootpornog sustava u mekanom vapnencu, široko korištenom građevinskom materijalu prethodnih stoljeća, potrebna je zbog njegove velike poroznosti. U ovom je radu, zasnovanom na rezultatima mjerenja izolirane građevine od mekog vapnenca, provjerena učinkovitost vodootpornog sustava. Rezultati izmjerene vlage također su omogućili dalje istraživanje te je izvršena termalna i higrotermalna analiza i graditeljsko-fizičke usporedbe. Ključne

Implementing the Technologies of Additional Impermeable Layers in a Building of the Monuments Office (Káčerov Majer) from a Sustainability Point of View

“…On the contrary, as also mentioned in the overview and state of the art, the technologies that were the subject of this research have been applied on several sites and their effectiveness has been verified [22,35,36] The different techniques of remediation interventions in this research were chosen mainly because of the complexity of the structure and the surrounding conditions. Grouting was applied in areas where it was not possible to apply stainless-steel plate stamping and undercutting technology.…”

Renovation of buildings having damp and salted walls – case analyses

“…There is a great deal of evidence acknowledging the effectiveness of renovation plasters used for renovating damp walls. The justification of the proposed solutions are multiannual observations of the renovated buildings and the analysis of the cases described in the literature (Dudás & Terjék, 2015;Misiewicz, 2016). Figure 5 shows the state of elevation at Waryńskiego Street three years after renovation and the elevation of the building called Under the Frogs after a year.…”

“…One cannot expect renovation plasters to be effective if the source of dampness has not been removed. In such cases the plasters lose their properties as a result of storing more salt caused by capillary suction, which considerably shorter their durability (Dudás & Terjék, 2015). It is bad practice of some contactors to apply renovation plasters in the dampest spots, as well as to combine them with lime-cement of low permeability of water vapour.…”