The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.
Maximum slope for epdm roofing.
The mechanically attached roofing system is not acceptable for installations on steel decks lighter than 22 gauge.
Epdm is fine if there is enough slope to drain any water off the roof within 24 hours of the last percipitation event.
Maximum height maximum warranty term m 80 24 4 adhered 090 platinum see platinum design guide unlimited ok 250 76 2 m 30 year 060 rubbergard epdm unlimited ok 250 76 2 m 25 year 045 rubbergard epdm unlimited ok 250 76 2 m 15 year d pavers 060 rubbergard epdm max.
System product slope barrel arch etc.
Normally 1 80 0 72 is the recommended minimum angle for a slope and this is universal across the vast majority of flat roofing systems regardless of the materials that they incorporate.
Although building codes do not directly prescribe maximum allowable roof slopes fire classifications which are required by code often do include maximum roof slope limitations.
With the rubbergard r m a.
A minimum slope of 0 25 inches per foot 2 percent is recommended for all low slope roofing systems for adhered systems the substrate must be one that is approved by the system supplier.
Grumpy chicago gutters chicago roofing.
The main component of the roofing system is the firestone rubbergard membrane a tough flexible epdm ethylene propylene diene terpolymer based sheet which is fully vulcanized to provide excellent dimensional stability and weathering resistance.
Higher density products provide improved impact resistance.
In order to achieve this drop a slightly steeper angle of 1 40 1 44 should be the aim when installing a flat roof as this accounts for surface.
The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.
The rubbergard max epdm membrane is an internally reinforced cured single ply roofing membrane that is designed to combat roof tears and punctures and provides superior resistance to wind forces.
There are no maximum slope restrictions for the application of the fully adhered roofing system.
A roof slope of 7 12 is also good and can provide the additional benefit of helping minimize the effects of wind driven rain.
System that uses large epdm panels.
The maximum recommended roof slope for mechanically attached roofing systems is 18 in one horizontal foot.
1 8 slope per foot is more than adequate.
