attic

EN 16798-7:2017 considers that windows on roofs that have a pitch below 60° are not included on the windward side whatever their orientation. It means that roof windows are accounted for, but only on the leeward side when using the existing standard for calculation of air flows, EN 16798-7.

Therefore, in the specific case of a room only equipped with roof windows (e.g. an attic) and aeraulically independent from the rest of the building, whatever the orientation of the roof windows, only the simplified “singlesided” calculation method of EN 16798-7:2017 is applicable.

Residential distribution systems are inherently inefficient at delivering heated or cooled air to the conditioned space as the result of poor design and installation practices. Examples of some of the more common problems include heat loss/gain in unconditioned spaces and leakage through supply and return ducts. These defects can result in significantly increased energy consumption, poor thermal comfort, and high peak electricity demand. Efforts to improve distribution systems

Heat transfer in loose-fill attic insulation was investigated in a large-scale model of a ventilated attic built in a climatic chamber. The particular aspect of this study was heat transfer by convection and its effect on heat losses through the attic floor. It was shown by thermal resistance measurements that the measured and calculated thermal resistance of the attic floor is within the margin of error. Air movements were detected in the insulation, sufficient to cause a decrease in the thermal resistance of the attic floor.

Mould, wet insulation, wet or weakened wood or premature aging of roof coverings often leads to the addition of extra ventilation in attics at time of renovation. The study develops a protocol to determine the effects, surveys several occupied buildings to establish why the ventilation was added, and establishes a base to analyse the effect of the installation.

Describes how design aids were developed to simplify the task of sizing inlet and exhaust openings and airway height for cathedral ceilings. Recommends guidelines for when and where roof ventilation is needed to avoid icings at eaves.

Presents a selection of moisture problems encountered in the south eastern USA. Discusses moisture in attics, moisture in floor cavities, moisture inside the house, hardwood floors with moisture problems, and vented crawlspaces.