Flat Bug Or Flat Built Up Gypsum Roof

Old gypsum roof board jimluckn civil environmental.

Flat bug or flat built up gypsum roof.

Gaf conventional built up roof systems for wood decks. If you find any good info please post it in here and i ll do the same. 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.

Condition of the roof deck is it corroded detached damaged or unsafe. Flat roofs make replacing a roof a challenge. Gaf conventional built up roof systems for cementitious wood fiber decks. Gypsum poured over formboards has been used as a substrate for roofing materials since the 1940 s.

Type x gypsum board none 76 35. Gaf conventional built up roof system for concrete decks. Most modern residential homes have relatively steep pitches. Poured gypsum concrete co ncrete block or 2 0.

The marks appear similar to a bug smear on a. 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. None 2 55 5 10 cedar shingles none type x gypsum 1 x 4 8 o c. And it has the 1 2 gyp board 2 gypsum roof over metal joists.

Gaf conventional built up roof system for wood 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. In general built up roofing tends to fare better in warmer climates than in cold regions. 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. 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. Flat roof systems are a bit of an outlier. Has the deck been deformed or deflected to the point where it ponds water.

However in many u s. Densdeck roof board gypsum board georgia pacific gypsum llc. None 72 00 cedar shingles none 1 x 4 8 o c. Its use increased since it provided roof deck fire protection diaphragm values and an economical substrate for roofing.

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.