Need advice from DIY types. I have an upcoming project which involves helping to install a floating engineered wood floor (the snap-together type) in three rooms and a hallway. The homeowner has expressed a desire to have the entire floor installed continuously. That is, no transitions at the doorways.
For a single room, one uses the longest wall for alignment. Usually an outside wall is chosen, these being the straightest. But this would mean reaching the doorways of each room to the common hallway out of alignment, requiring a transition piece to hide the joint.
If I start along the longest wall of the hallway, I can work my way into each room from the hallway continuously. But I'd like to check the alignment of the hallway wall w.r.t. the back wall of each room (around corners, through doorways, etc) to establish proper alignment once I reach the back wall of each room.
Any tips or tricks to establishing parallel layout lines around corners and through doorways? Giant carpenters squares? Online web pages, videos, etc?