More modern tiling and felt shingle systems can achieve lower slopes down to about 20 degrees.
Sloped lean to shed roof pitch.
Another widely used method is to follow the house s roof pitch on one side building the ridge off center then sloping down more drastically on the shorter side which will be closer to the house.
Featuring all four walls this shed is designed to be built up against a house or fence.
For slopes below 20 degrees systems such as epdm fibreglass metal roofing can be used.
This model is also great for any yard with limited space.
A 4 12 pitch is around 18 5 degrees but not exactly.
If the roof pitch is very steep at all then it will rise to a height that becomes unsightly.
Once installed your lean to style shed can look like an extension of your home.
This ugly design is most often avoided by installing a low slope roof to keep the rise of the roof at a minimum.
The run for a lean to shed rafter ending into a wall should account for the ridge board nailed into the wall where the tops of the rafters rest into.
For lots more information on which roof finish to use for which slope and indicative costs.
In other words if there is a 1 1 2 ridge board nailed into the wall and the width of the lean to is 96 then the run will be 94 1 2 96 1 1 2 94 1 2.
Some may say it is ugly.
Lean to shed roofs develop an interesting problem as they get larger.
Some builders even choose to match it directly especially if the shed s roof is attached to the house on the high side and just one simple span pitch.
Thus a 4 12 pitch would be a 33 slope.
A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible.