Continue installing porch roof supports.
How to install temporary roof supports.
Bring in the temporary beams and install them in place.
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Once it is plumb mark the position on the porch roof.
Stand a post up in the bracket and hold a level on its side.
Bring in a sledgehammer and insert some wooden pieces into the ground.
These pieces act as the bases that hold the legs of the support beams.
The ideal height of such beams should be 2 10 foot longer than the distance between the roof and the ground.
Attaching the two with bolts every foot or two 50 cm.
Install another bracket in this position.
Once both of the brackets are secured set a post into them.
For a perpendicular support you should use square pieces of 3 4 inch plywood or other scraps of wood that are at least 10 inches wide.
I did not interpret your question as whether to support the open web joist on their top or bottom chord.
If the ground area is hard and difficult to penetrate then you can go for an alternate solution.
Make sure that the beams support the roof well and are not left loose or wobbling.
If you have space and there s any structure left near the ends the easiest way is to not replace the existing rafters and joists but to sister a second board on the side of each.
Place the wood on the floor or ground and hold in place with small screws.
Use 2 inch carriage bolts to secure the posts to the mounting brackets.
Vertical shoring against the top chord of the joist is most certainly the least expensive choice.