Steps  to Install a Patio Roof on an Existing Home
                     How to Attach a Patio Roof to an Existing
House
Incorporating  an  attractive  patio  roof  into  your  home can  offer  ample  shade,  expand  your
outdoor living area, and elevate your property's curb appeal. Qualm about its process? Fret not;
with this comprehensive guide, you can appropriately attach a patio roof to your existing house.
If  you  require  professional  assistance,  engage  reliable  and  experienced  professionals
specializing in patio covers in Sacramento. 
Ways to Attach a Patio Roof to the House
● Planning Your Patio Roof:
Planning is the key! So, before commencing, determine the size and design of the patio
cover. Consider factors like the sun's direction, the view, and the backyard layout. Most
significantly,  check  local  building  codes  and  obtain  necessary  permits.  Companies
providing patio covers in Rocklin often assist with this process. 
● Gathering Materials and Tools:
Once your plans are in place, gather the required materials. You'll need posts, beams,
rafters, roofing material, and fasteners. The type and quantity of materials will depend on
your patio roof's design and size. As for tools, you'll need a circular saw, a drill, a level, a
ladder, and safety gear.
● Setting the Posts:
Start  by marking where the posts  will  go.  They should align with  the edge of  your
existing roof. Dig holes for the posts, then place them in the holes. Use a level to ensure
they're straight. Once they're in the apt position, fill the holes with concrete and let it set. 
● Attaching the Ledger Board:
The ledger board is what connects your patio roof to your existing house. It should be
attached to a solid part of your house, like a wall stud. Measure and cut your ledger
board to fit, then attach it to your house using lag screws. Ensure it’s leveled.
● Installing the Beams:
Next, install the beams. These are the horizontal pieces that connect the posts to the
ledger board. Cut the beams to the right length, then attach them to the posts using
metal connectors or bolts. The other end of the beams should rest against the ledger
board.
● Adding the Rafters:
Now, add the rafters  — components that hold the roofing material in place. Cut the
rafters to the right length and angle, then attach them to the beams and ledger board
using metal connectors. Again, make sure everything is level.
● Putting On the Roofing Materials:
Now add the roofing material, like metal, shingles, polycarbonate, or any other suitable
materials, to your patio roof if the structure is in place. Begin at one end and proceed in
the same direction, connecting the shingles to the rafters as you go.  
● Finishing Up:
Finally, double-check that all fasteners are snug and the structure is secure. To handle
rainwater, install gutters and downspouts. It is also beneficial to paint or stain your patio
cover to protect it and improve its appearance.
Conclusion
Attaching a patio roof to an existing house might seem intimidating, but with deliberation and
execution, it's achievable. However, if you feel unsure at any point, engage professionals to help
accomplish the task for you. Besides enhancing your outdoor living space, a well-structured
patio increases your house's worth. So, ensure it's done appropriately. 
--Article Source--
https://www.fuzia.com/article_detail/794344/how-to-attach-a-patio-roof-to-an-existing-house