Then apply standard asphalt shingles over the membrane.
Low slope asphalt shingle roof.
Made of several layers of bitumen surfaces built up roofing is finished by applying an aggregate layer or coating as the top layer.
The membrane will outlast the shingles and seal around all nail penetrations.
1 cover the entire surface with a self adhesive flashing membrane such as grace ice water shield there are many equivalent products.
This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units.
Because of the non absorbent nature of asphalt the shingles themselves provide an element of waterproofing which is why they work well for low slopes.
The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
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Asphalt shingles can only be installed on roof slopes of 2 12 or greater.
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Minimum roof slope roof pitch r905 2 2.
For a low slope residential roof there are two main options.
Asphalt shingles are an effective roof covering material for sloped roofs that can be successfully used on slopes as low as 2 12.
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.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
What is the minimum slope for an asphalt shingle roof.
Guide to roofing underlayment installation on low slope roofs with asphalt shingles.
This top layer normally is tar over which the gravel is laid.
Built up roofing is the most popular roofing material used on low sloped roofs.
Iko roof fast low slope roofing components are engineered and manufactured to meet those particular challenges.
Start with a 19 inch strip of 15 lb.
Self adhesive flashing membrane under the shingles prevents leakage on low slope roofs.
A 3 per foot slope is considered low but may be acceptable if a double layer of felt is used.
Some building codes allow as low as a 2 slope with asphalt shingles if additional steps are taken.
Asphalt shingles can be used on roofs with a slope of 2 12 to 4 12 if double coverage underlayment is used.
Sbs modified asphalt 7 solvent based 3 steel 4 color finish.
Roof fast 95 base iko roof fast 95 base is a self adhesive product that can easily be cold applied on low slope roofs.
Low slope roofs present special challenges in terms of preventing unique types of damage.
Asphalt saturated felt along the eaves and lap succeeding courses by 19 inches as shown in figure 2 3.
When combined with the proper underlayment materials and application they are an excellent solution for a low slope roof with a pitch between 2 12 to 4 12.
