The paper is devoted to the comparison of interstitial condensation calculation in wooden framework constructions made by two different calculation methods. Latvian Building Code LBN 002-01 “The thermal performance of building envelopes” states that condensation on wooden details of building elements is not allowed. At the same time the Building Code does not specify the methods that should be used for the calculation. So the calculation of interstitial condensation may be done by the traditionally used in Latvia method of Fokin-Vlasov and by the method of EN ISO 13788 “Hydrothermal performance of building components and building elements. Internal surface temperature to avoid critical surface humidity and interstitial condensation. Calculation methods.” The methods use different coefficients: vapour transfer coefficient and vapour transfer resistance factor. The paper will show common and different features of the methods on the example of widely used wooden framework construction. It analyzes the possibility of interstitial condensation in wooden carcass wall with variable thickness of insulation using both calculation methods. As the result of the calculations the defects of the chosen construction were shown