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I have a covered porch that needs enclosing. The rub is that it is tiled and sloped to drain. Its L shaped and sections have different slopes. I’m trying to match inside elevations with outside ones, set door and window elevations, in case I want to install a plywood sub floor so that the porch can be leveled. There may be enough room to leave the tile down if I can shape (spile?) the sleepers properly. I can’t figure how to shoot a level from the inside elevation to the outside of the porch and then take off the shape. By the way, many have advised against trying to float a new surface because it would be too thin, from 1/2″ to 3″s.
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1st set up a transit and establish your 4 corners. 2nd set the back and front end joist. I nail down a flat 2x4 1 1/2" in, then set the set the joist next to it. Make sure the ends are touching the ground, now mark the corner heights on the ends and chalk a line and rip it. Set the rest of the perimeter this way. If the floor has a sag in it I lay the field joist crown down to eliminate bounce in the middle. I put them in the same as the perimeter cutting each one individually. It's slow but, it makes a nice flat floor.
*PaulIf the porch is fairly small (less than 16' square)you can use a straight 2x4 and a level to put marks around the perimeter which will tell you how low each point is. Set a block on your interior finished floor. Put the 2x4 on the block and run it out the door and to the perimeter of the porch. set a level on top of it and when it reads level measure down to the perimeter. Write this measurement down at this location. Subtract the thickness of the block you used inside plus the thickness of your plywood and finished flooring and this is the heigth of your sleeper at this point. Cut a block this thickness, install it at this location and use this as your sleeper control heigth. Continue doing this around the perimeter of your porch. Leveling to points and writing down the thickness. Once you have these dimensions you can cut your sleepers to fit. After the perimeter is install you can level your interior sleeper grid using the perimeter as a guide.If it's a larger porch a builder's level would be a great help.Good luckTerry