Another approach is to build a cupola or ventilated doghouse in the middle of the low slope roof an approach championed by joe lstiburek.
Low slope roof designs.
The membrane will outlast the shingles and seal around all nail penetrations.
Specifically the code text typically reads roofs shall have a design slope of not less than one fourth unit vertical in 12 units horizontal 2 percent slope for drainage the stated and intended purpose of the code specified 1 4 in 12 slope is to provide drainage.
Then apply standard asphalt shingles over the membrane.
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However ponding water is often observed in these low slope roofs.
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For a low slope residential roof there are two main options.
May you like low pitch roof house plans.
Perhaps the following data that we have add as well you need.
If the upper edge of a low slope shed roof intersects a vertical wall the most logical approach in my opinion is to detail the roof as an unvented roof.
1 cover the entire surface with a self adhesive flashing membrane such as grace ice water shield there are many equivalent products.
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You can incorporate a sloping roof in these houses.
When design professionals specify framing members to minimum building code parameters alone it is possible for the constructed roof to have in service low slope issues related to ponding or drainage of the system.
Extended roofs supported by pillars also go well with these houses.
Small houses can look beautiful and compact when you go for a small roof design.