Roof Deck Drainage Design

If the deck is a steel deck appropriate roof substrate sheathing i e gypsum based boards plywood may be secured to the metal deck and the fully reinforced rubberized asphalt membrane applied to the surface. Design professionals frequently specify the minimum code permitted slope with little if any consideration of the resultant valley slope created by the intersecting planes figure 1 ponding water is commonly observed at valley intersections for low slope roof and deck. One gully can drain at least 150 m2.

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It might be easier to re frame a sloped surface to drain to a suitable roof edge.

Roof deck drainage design.

Proper waterproofing for a roof deck involves installing an epdm membrane and flashing around deck. Aco offers functional solutions which are specially designed for flat roof areas and which ensure the water is drained effectively. Rooftop metal deck idea. Trex rainescape under deck drainage system.

Drainage solutions watts roof drains provide flexible solutions for specifiers and installers in any commercial roof application. Planters with foliage plants along the modified parapet improve the look of the deck. The trough and downspout design drains water away from your deck allowing you to create a dry patio or storage area on the ground level below. Convert the space under a second story deck into a dry spacious patio by installing this simple under the deck roof and gutter system.

Smith carefully designs and manufactures a full line of roof drains deck drains scupper drains promenade and parking area drains and more to satisfy both the artistic eye of the architect and the calculating mind of the engineer. Our exclusive dual functional structural deck flange and combination roof drains streamline specifications saving installation time and labor. Unfortunately adding tapered insulation to re pitch a roof deck costs about as much as the rest of a re roof job. You can also add small garden trees to aid to your green design.

A rooftop garden with wooden deck and central glass floor adds a lush twist to your roof top deck. For smaller surfaces gravity drainage systems are the ideal solution. Building offsets are common and create intersecting planes that contribute to drainage issues for low slope applications. Double your outdoor living space with an under deck drainage system.

The most basic requirement for proper plaza deck design is proper slope to drain provided by the structural slab. Many times when roof decks are installed they further damage roofs causing more severe leaking and drainage problems. One of our readers rune eriksen sent us photos of his design for a home built deck drainage system and we were impressed enough to check it out. Leaks around the flat roof drain seerp into the fascia aug 29 2012 terry weir mbe said.

Flat roofs are prone to leaking even without decks because of design errors improper materials and improper installation. For larger roofs siphonic drainage systems should be installed.

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