Flat Bug Or Flat Built Up Gypsum Roof

Type x gypsum board none 76 35.

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. 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. There s a lot to know about flat roof systems and how they. Gaf conventional built up roof system for concrete decks.

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. 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. Gaf conventional built up roof systems for cementitious wood fiber decks. In general built up roofing tends to fare better in warmer climates than in cold regions.

None 72 00 cedar shingles none 1 x 4 8 o c. Densdeck roof board gypsum board georgia pacific gypsum llc. Old gypsum roof board jimluckn civil environmental. Poured gypsum concrete co ncrete block or 2 0.

None 2 55 5 10 cedar shingles none type x gypsum 1 x 4 8 o c. 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. 11 08 18 page 5 of 27 approved fasteners. Gaf conventional built up roof systems for wood decks.

Flat roofs make replacing a roof a challenge. If you find any good info please post it in here and i ll do the same. However in many u s. Condition of the roof deck is it corroded detached damaged or unsafe.

Gaf ruberoid modified bitumen roof systems for gypsum decks. Doing a building assessment to see if we can bring a 45 year old building up to current code. Flat roof systems are a bit of an outlier. And it has the 1 2 gyp board 2 gypsum roof over metal joists.

Gaf conventional built up roof system for wood decks. Has the deck been deformed or deflected to the point where it ponds water. 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. The marks appear similar to a bug smear on a.

Drill tec accutrac flat. Most modern residential homes have relatively steep pitches.