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1945 Theatre Catalog, 4th Edition, Page 189 (167)

1945 Theatre Catalog, 4th Edition
1945 Theatre Catalog
1945 Theatre Catalog, 4th Edition, Page 189
Page 189

1945 Theatre Catalog, 4th Edition, Page 189


Be sure to check all roof flashings. They too should be properly designed and installed, and should be guaranteed along with the roofing. Most weaknesses usually show up in Hashings or at the flashing line. Inasmuch as dashings are exposed to the same conditions as the roof covering itself, they should be built to last just as long, and should receive proper attention after they have been installed.


The matter of roof drainage should also receive your attention. Roof drains are provided to carry the water away from the roof. The roof drain head or connection is a device that connects the roof or roofing to the interior drainage system. The drain head performs a very important function because it protects the building at the point where the flow of water is the greatest. These heads should be of heavy cast iron and should be equipped with a large strainer and a metal hashing dange to prevent stoppage of the drain and allow for

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THE DRAINAGE SYSTEM of roots is important. Here is a sectional diagram of the Barrett-Holt root con nection, Type i-LG, designed for use on flat roofs.

proper connection to the roofing. You should never permit your roof drains to become obstructed with foreign matter, such as leaves or other loose material which accumulate on the roof. It is well to provide a factor of safety either in the form of additional drains or in the form of scuppers which are inserted in and through parapet walls near the low point of the roof and about two inches below the top of the base dashing.


These three things, then, are important: First, the roof covering; second, the dashing-s which connect them to parapet walls and other vertical surfaces; and, third, the roof drainage system. These elements are only as good in service as their adaptability to the particular conditions involved, and to the care and skill with which they are applied or installed. Good roofs are the result of the use of the proper materials of high quality, applied according to approved specifications or methods, by workmen


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THREE TYPES OF FLASHING are shown in these Barrett Division drawings. At the top is the concealed Typo AA, with a special block covering the actual hashing. Lower left is the concealed metal fiashing, and lower right shows the exposed Type AA fiashing. Regardless of the type that is used on theatre roofs, it is highly important that it be installed properly-and covered by the guarantee theatre owners receive from the builder.

who know their business Wherever possible, bids for new roofs should be based on complete specifications prepared by an architect or other equally competent person. This will provide a definite basis for getting what you pay foreif you will insist on the specifications being followed. By requiring a guaranteewr bondeby a reputable roofing contractor or roofing manufacturer, you will secure proper inspection before, during and after the application, and you will have a responsible guarantor to fall back on when and if you need him.

Several of the large theatre chains have their roofs inspected regularly by their maintenance superintendents. They require a signed statement from the superintendentecountersigned by the 10cal managerethat the roofs are free from rubbish, that all roof drains are clear and working, and that there are no leaks. This is a good system and one you might use on your theatre. It will constantly remind your local manager and your maintenance man of their responsibility in relieving you of roof troubles.

GENERAL METHOD OF APPLICATION of a built-up roof membrane is shown in this photograph from the Barrett Division at the Allied Chemical and Dye Corporation. Over each successive layer of tarred felt, pitch heated to not less than 400 degrees is poured at the rate of 200 pounds to each 100 square feet. After the final felt ply is laid, embedded in each 100 square feet are 400 pounds of gravel or 300 pounds of slag.

1945 Theatre Catalog, 4th Edition, Page 189