When you are building a patio cover off of an existing roof or wall you must take all of your measurements from the point at which the patio roof will attach to the existing structure not the outside of the slab.
How to build a shed roof patio cover.
Make the patio roof a little bit higher.
Use batter boards and string to layout the location of the legs.
Patio cover plans building.
Apply the 3 4 5 rule to each corners so you make sure they are square.
If attaching a patio roof to a ledger beneath the eaves does not allow for enough headroom you can set the new patio roof s rafters on the wall s top plate.
Therefore select the location and level the surface with attention.
On a two story house you can usually tie the ledger into a band joist also called a rim joist located between the floors as shown below.
The chain of load distribution begins at the roof covering material which exerts force on the cover s ceiling joists.
Using corrugated metal also allows me to reduce the degree of slope or roof pitch needed to a mere 10 percent or a 1 to 10 pitch.
The existing slab can vary considerably throwing off crucial measurements.
It is almost similar to the first method but to make the patio roof a little bit higher you will need to remove the house gutter and place the back channel a bit higher.
Because the gutter is removed you will need to install transfer flashing from the roof of the house to the patio.
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The first step of the project is to layout the patio cover posts.