Flat Bug Or Flat Built Up Gypsum Roof

Gypsum poured over formboards has been used as a substrate for roofing materials since the 1940 s.

Flat bug or flat built up gypsum roof.

Type x gypsum board none 76 35. None 72 00 cedar shingles none 1 x 4 8 o c. Flat roof systems are a bit of an outlier. Gypsum decks incorporated the placement of bulb tees.

Built up roof none type x gypsum plywood none 27 40 built up roof none plywood type x gypsum board none 67 00 cedar shingles none 1 x 4 8 o c. Densdeck roof board gypsum board georgia pacific gypsum llc. Condition of the roof deck is it corroded detached damaged or unsafe. Built up roofs account for a large percentage of the commercial roofing systems in the.

Cities with older housing stock think federal hill in baltimore or alexandria virginia s old town the roofs are often flat or have very low slopes. Gaf conventional built up roof systems for wood decks. Old gypsum roof board jimluckn civil environmental. Doing a building assessment to see if we can bring a 45 year old building up to current code.

Built up roofs or burs also called a tar and gravel roof is a well established and popular style of flat roof that is made up of alternating layers of roofing felt or fiberglass and asphalt that is applied with heat which combine to make a long lasting sturdy roofing system. In general built up roofing tends to fare better in warmer climates than in cold regions. Flat roofs make replacing a roof a challenge. Gaf ruberoid modified bitumen roof systems for gypsum decks.

11 08 18 page 5 of 27 approved fasteners. If you find any good info please post it in here and i ll do the same. Fig 4 is the deck capable of handling a heavier roof system such as replacing a built up roof membrane 4 10 psf with a ballasted single ply system 10 20 psf. Gaf conventional built up roof systems for cementitious wood fiber decks.

However in many u s. Drill tec accutrac flat. Its use increased since it provided roof deck fire protection diaphragm values and an economical substrate for roofing. Gaf conventional built up roof system for wood decks.

There s a lot to know about flat roof systems and how they. And it has the 1 2 gyp board 2 gypsum roof over metal joists. Has the deck been deformed or deflected to the point where it ponds water. Built up roofing lifespan depending on the climate and the specific materials used built up roofing has an average life expectancy of 15 to 30 years but some constructions can last up to 40 years.

Gaf conventional built up roof system for concrete decks. None 2 55 5 10 cedar shingles none type x gypsum 1 x 4 8 o c.