For a low slope residential roof there are two main options.
Low pitch roofs architectural shingles.
However roofing over old shingles should be done only when the existing shingles and the roof underneath are in good shape.
1 cover the entire surface with a self adhesive flashing membrane such as grace ice water shield there are many equivalent products.
But other than that a higher roof slope is much better for the shingles.
So given your location and the fact that.
With respect to shingle application roof slopes from 2 12 to less than 4 12 18 5 are called low slope roofs while roof slopes of 4 12 or greater are called normal or standard slopes.
Architectural shingles are a different style of asphalt shingle that are thicker than a 3 tab shingle and layered for an upscale look.
Architectural shingles are available in 30 or 50 year varieties.
However those naysayers would be wrong.
In combination with iko roof fast cap sheets it provides waterproofing properties and durability for low slope roofs.
These shingles often cost 200 400 per square.
Cedar or wood shake.
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.
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.
Then apply standard asphalt shingles over the membrane.
I have to say having a low roof slope sure makes it more comfortable to install the shingles.
The roofing materials most often used for these pitches include asphalt composite shingles.
Some will argue that shingles shouldn t be used for low pitch roofs at all.
Also roofing over old shingles adds a lot of extra weight to a roof which can be especially problematic in high snow load areas.
Gaf asphalt shingles combined with the proper underlayment make ideal low slope roof shingles that do an excellent job of preventing water build up and leaking.
Iko roof fast base ma is a fiberglass reinforced nailable base with a special film surface designed to be used as one of iko s roof fast low slope roofing components.
Asphalt shingles should never be applied to roof slopes below 2 12 2 of vertical rise for every 12 of horizontal run or 9 5.
As well a slope of 4 12 is most commonly considered the lowest slope for standard shingle installations.
According to the asphalt roofing manufacturers association 301 348 2002 asphalt shingles can be applied to a roof with a pitch as shallow as 2 in 12.
Traditional 3 tab shingles made with asphalt composite are the most popular type of shingle and are the most flexible in terms of adapting to many roof pitches.
The membrane will outlast the shingles and seal around all nail penetrations.