States that the calculation of transient pressures in buildings requires the estimation of the rate of air leakage through various paths. Gives an expression for infiltration through a wall component. Gives formulae for calculating pressure transients inside a building under forced ventilation with air leaking out of the building under various conditions. Theseformulae also apply when air is leaking into the building. Discusses practical applications and the practical problems for which the formulae are useful.

Reports project to measure wind pressures on low-rise buildings. Describes site and houses in the estate selected for investigation. Gives details of an associated experimental building. Outlines positioning of the pressure transducers andgives details of the cabling and the reference pressure system. describes velocity measurement, recording equipment and methods of calibration, processing and analysis. Gives details of records taken in tabular form.

Weatherstrip for windows and doors were studied by full-scale tests with regard to airtightness, closing force and ageing properties. Tubular strips provided the highest degree of airtightness in both windows and doors, while angle strips were only slightly inferior in performance. The leakage of air was found to be considerably greater for strips of expanded and foam plastics and fibre strips. For tubular strips of small material thickness and for angle strips, the closing force in doors was low.

The overall air leakage of high-rise buildings cannot be measured using a full pressure method because of the large volume involved. Describes a method of conducting small-scale pressurization tests on the exterior walls of apartments in multi-storey buildings. Gives results of measurements in a test building. compares direct method with values obtained by summing the air leakage of individual components. Finds good agreement. Concludes that floor/wall joints, windows and window sills are the three major air leakage sources in exterior walls.

Describes a pressure transducer which was specially developed to measure wind pressures exerted in buildings. The instrument, which gives an electrical output, is suitable for measuring pressure in the range of 1200 n/m2. The frequency response enables pressure fluctuations lasting only 0.1 s to be recorded.

Studies influence on energy loss of an air curtain installed at building entrance. The energy loss consists of transmission loss and ventilation losses caused by stack effect, pressure difference due to wind, direct wind on the entrance and differences in the specific gravity of inside and outside air. Gives an example of calculated energy loss at the entrance of a simulated department store. Outlines principles and types of air curtain.

Describes how internal heat sources such as bathrooms and kitchens can significantly influence stack effect in high rise residential buildings. Taking into account storage characteristics of surrounding walls derives relationship for determining behaviour of air temperature in internal kitchen. Discusses differences found by this method and computer method between values for ventilation heat losses according to TGL 112-0319.

The two-storey house at Aylesbury, England, built by the Building Research Establishment for the full-scale measurement of wind pressures has been modelled at 1:500 scale in a boundary layer wind tunnel to verify the reliability of simulation forlow-rise buildings. Describes wind tunnel tests of buildings models of 5 and 22.5 roof slope. Compares surface pressure measurements with full-scale data for various wall and roof locations. For the model terrain best modelling conditions, the results show agreement which is encouraging.

Reports investigation of airtightness of two types of industrial wall when subjected to a differential pressure across the wall construction. Laboratory tests were performed on wall units, overlap joints in vapour barriers of plastic sheet,on steel stud wall with metal sheeting and joints in the light- weight concrete element wall being studied. Shows that methods of construction employed so far can be retained if modifications are made concerning junctions and the sealing of joints. In sheet metal walls, the contact pressure onto the plastic foil must be guaranteed.

Describes continuous measurements of wind induced pressure differences across the exterior walls of two schools taken over a period of 8 months. These schools were selected from a total of eleven schools whose air leakage characteristics had been previously studied. Calculates air infiltration rates caused by wind using the measured differentials. Evaluates equivalent pressure differentials caused by wind. Calculates uniform pressure differentials caused by stack action using a computer model.