Modified Bitumen Roof Minimum Slope

The proper name for modified bitumen is polymer modified bitumen.

Modified bitumen roof minimum slope.

Modified bitumen membrane roofs shall have a design slope of not less than one fourth unit vertical in 12 units horizontal 2 percent slope for drainage. Minimum required roof slope for roofing materials. In 12 0 25 in 12 1 19 built up roof coal tar pitch. While these membrane can be applied to higher sloped roofs these are typically installed on low sloped roofs.

And 4 12 minimum roof slope for slate and wood shakes. R905 11 2 material standards modified bitumen roof coverings shall comply with the standards in table r905 11 2. Modified bitumen membrane roofs must have a design roof slope of 1 4 12 or greater 2 slope. The success or failure of a roofing system depends greatly on the use of the proper grade of asphalt as called for in the roofing specification.

These polymers typically improve softening temperatures durability and waterproofing to name just. Minimum required slope x in 12 minimum required slope degrees asphalt shingles. 9 46 built up roof asphalt. This means for every 12 horizontal units the roof must rise a minimum of one fourth vertical unit.

2 1 2 12 minimum roof slope for clay and concrete tile. 18 43 asphalt shingles with special underlayment requirements 2 in 12. Jm recommends the use of only two grades in sbs modified bitumen specifications type iii and type iv. 3 12 minimum roof slope for metal roof panels with nonsoldered seams without applied lap sealant metal shingles and wood shingles.

Modified bitumen roofing minimum roof slope roof pitch r905 11 1. Thermoset single ply roofing minimum roof slope roof pitch r905 12 1. For steep slope roof systems ibc 2018 provides for a 1 12 minimum roof slope for mineral surfaced roof roll roofing. That is a roof with a pitch that is a minimum 1 4 inch per ft.

Modified means that certain characteristics of the asphalt bitumen have been enhanced by the addition of polymers to the asphalt blend. The slope of the roof as well as the climate governs the grade of asphalt to be used.