Speaking about standing seam metal roof slope it is a general and a self evident knowledge that the steeper it is the faster it is for snow rain or drain to come down the roof.
Minimum pitch for metal roof canada.
I e 4 inches of rise per 12 inches one foot of run.
Lap sealants shall be applied in accordance with the approved manufacturer s installation instructions.
You can often see such examples of use over metal decks.
To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope.
This recommendation con flicts with some manufacturers who list 1 4 in 12 1 2 degrees as an acceptable minimum slope.
Coal tar base gravelled 1 in 50 1 1 in 25.
The minimum pitch for metal roof shingles and lapped non soldered panels is 3 12.
If a roof slope rises say 4 inches when measured 12 inches along the bottom of a horizontal roof truss the roof slope is said to be 4 12.
Asphalt base without gravel 1 in 25.
Mum slope for structural metal panel roof systems should be 1 2 in 12 2 4 degrees.
Most metal roofs will have minimum pitches of three in twelve but this might sometimes go down depending on whether there are special installation procedures issued by the manufacturer regarding that particular roofing material.
The pitch is measured in inches of vertical rise per foot of horizontal run and the 5v crimp profile shown above requires a minimum slope of three in twelve or 3 12 3 inches vertically per 12 inches horizontally.
The 1999 boca national building code and 1999 standard building code list the minimum slope for metal panel systems as 1 4 in 12 1 2 degrees.
After that the miimum pitch for metal panels depending on the methods used to join the panels.
Panels joined with an applied lap sealant can go as low as 12.
Standing seam manufactures allow applications of metal coverings on slopes of 12 or even more.
Profile in the context of metal roofing means the shape that the sheet of metal is bent into to form the panels.
The national building code of canada 2005 has now clearly without doubt defined that a deck area is considered a roof and that the only acceptable standard for pvc membranes is cgsb 37 54 95.
Asphalt base gravelled 1 in 50 1 1 in 4.
