English

Gives details of a method for determining the amount of radon emanating from a carbonate rock specimen. Analysis was first made with rock in solid form. An essay was then made with the material containing radium in a clear acid solution.< Discusses the need for the analysis of building material causing any type of abnormally high background variation. Outlines laws covering the buildup and decay of radon.

Reports daily run-of-wind measurements, made for 3 years at distances of 3.5 h and 7 h to leeward of a 7-row shelterbelt about 6m.high. After elimination of variations in wind direction, the monthly values of relative shelter at these positions showed no evidence of an increase with time. The variations in wind direction were eliminated by regressions of monthly values of relative shelter on the monthly percentage frequency of effective winds, i.e. winds from the normal windward side of the shelterbelt.

Presents a new concept of describing the tolerance level of radon daughters. This concept is in terms of the alpha-energy dose resulting from the complete decay of the daughters. Describes a rapid field method for determining atmospheric concentrations of radon daughters in terms of Mev of alpha energy/liter. No attempt has been made to set a maximum allowable concentration for radon and/or its daughters. Should an M.A.C.

Presents the air leakage characteristics obtained from measurements of nine brick and concrete block walls in the DBR/NRC huts at Ottawa and Saskatoon. The leakage characteristics of the first three walls were obtained in the Saskatoon test huts - the remainder were obtained in the Ottawa huts. All thetest huts had an overall plan area of approximately 6 ft. by 6 ft. The effects of fill-insulation and different surface finishes were determined.

States that concern for weathertightness requirements for windows has increased recently. Discusses standard methods for testing air leakage and rain penetration of windows. Illustrates some general findings on air leakage. Discusses relationship between air leakage and rain penetration. Outlines characteristics of leakage through doors.

Air leakage through the junction between wall and roof of a building can cause damage from excess dampness. Discusses in detail the problem of constructing atight wall/roof junction for different forms of roof construction. describes installation of roof membrane and vapour barrier.< Also describes problem of air infiltration through uninsulated soffits. Outlines various solutions.

Reports experiments using sulphur hexafluoride as a tracer gas to obtain quantitative data on actual residence time distributions in rooms and hallways and contamination caused by reentry of laboratory fume hood exhausts into a building. Defines a factor k which gives a measure of the mixing of fresh withstale air in part of a room. Measured values of k varied from 0.3 to 0.7 insmall rooms without fans. Discusses two experiments to find the amount of exhaust fumes reentering the ventilation system of a building.

Describes use of thermography by Fishburn Thermography group ltd. Outlines use of camera and isotherm function. Suggests use of thermography for the detection in walls of heat losses, thermal bridging, wet or inadequate insulation, air infiltration and other defects.

Investigates use of an array of spires, located at the entrance to the working section of a conventional wind tunnel, as a means of generating thick shear layers with properties similar to those of the neutrally-stable atmospheric wind. Compares data obtained in the shear layers created by sucharrays of spires with some available atmospheric data. Modifications to thespire design and a range of spire sizes have been tested and the resulting shear layer properties compared.

Reports survey of the energy consumption of 50 low-energy passive solar houses in the Saskatoon area. Gives graphs of energy consumption versus degree days for standard and low-energy houses and space heating consumption per unit floor area. Gives table of measurements.