Cover the entire low sloped roof area with a self adhered modified bituminous membrane that will act as an ice and water.
Low slope roof shingles.
Some will argue that shingles shouldn t be used for low pitch roofs at all.
If you have a low slope roof but would love to have a shingled look rather than other solutions like rolled sheet roofing you are in luck.
Most manufacturer and industry recommendations require or at the very least recommend special underlayment or other considerations on roofs between 2 12 and 4 12.
Shingles that are not self sealing must be hand sealed with asphalt roofing cement.
Low slope roofs present a challenge where water is concerned.
As well a slope of 4 12 is most commonly considered the lowest slope for standard shingle installations.
Some building codes allow as low as a 2 slope with asphalt shingles if additional steps are taken.
Low slope roofing shingles.
3 tab shingles versus laminated shingles for low slope roof.
They typically had different underlayment recommendations for low slope roofs 2 12 to 4 12 pitches but that was about it.
However those naysayers would be wrong.
And by the way the manufacturers instructions i reviewed for the shingles i was interested in buying described installations down to a 2 12 pitch.
The usual slope for asphalt shingles is a 4 or greater rise for every horizontal foot of run.