Hello again, I am Hugh Scott owner and founder of Indiana Floors LLC.
After incurring many questions regarding the correct method as applied to the installation of a ledgerboard with your ceramic tile installation I have put together another mini-pictorial seminar.
What is a Ledger Board: Ceramic Tile 101
A ledger board is a device used to support the primary row of tile on a level plane. Most ceramic tile ledger boards can be a 1" x 2" Pine board, I have seen them smaller and used ones larger depending on the format (size) of the tile.
Installation:
Install all your wall waterproofing membrane according the specifications that apply from the manufacture.
Measure up from the shower floor 12"-9" or 6" what ever suits your fancy. pick any corner it does not matter as you are making a level point, (your floor will never be level.) I use 12".....Mark a line... get a level, I use a 2 ft level, take that level and draw that line all the way around your shower.
Nail or screw the ledgerboard (in the location of stud if possible) so the line is just at the top of the board, some boards may bow a bit...as wood will do... keep that in mind when you start setting tile. (You can fudge the low spot later with a piece of the cardboard box or a wood shim under the tile in that area. Stud spacing will vary based on your vent pipe location)
Once the board is secure start setting your tile.I only go 3 tiles high the first day so the downward pressure does not push the ledgerboard out of place. The next day I come back, remove the ledgerboard, cleanup the thinset off it so I can reuse it on another job and clean the extra thinset off the wall and any on the edge of the tile, I then take some modified thinest and patch the holes left by the screw or nail.
When the screw or nail is removed the compressive nature of the waterproofing membrane will reset on itself, the extra dab of thinset brings it back to watertight.
You now have a LEVEL point to work off.
Please view the pictorial below.

You can add the ledgerboard kit to your shower kit here if you need one:

Full Application

48"x48"Ledger Board kit 4-48"-47" 1"x2" boards. $22.50

60-96"x48"Ledger Board kit 6-48"-47" 1"x2" boards. $29.50

24" Level $9.95

Sponges $1.95 Pr Sponge

Shower Install 101: General Application

Shower Install 101: Membrane Install

Shower Install 101: Ledgerboards

Shower Install 101: Shower Floor

Shower Install 101: Inside Corners

Shower Install 101: Outside Corners

Shower Install 101: Premolded Corners

I will add more info as I get requests for it, if you have an idea you think would help the masses, email me at hscott@Indianafloorsllc.com
Prepping your shower for ceramic tile was something that very few people did themselves a few short years ago.Prior to the introduction of kits with presloped trays and waterproofing membrane it was a Trade Only application.
However...... those of us in the trade realized we had been taught incorrectly based on what our mentors had been taught, some of us "Pros" adapted quickly while others still languish in the "ceramic tile darkages" or criticize those that have taken the leap into the light.

Even more have taken on a mentality that unmodified thinset applications are superior to modified thinsets.
Keep in mind; this is propaganda perpetrated by companies attempting to thwart warrantied failures or other issues. Modified thinset is superior in all was to unmodified thinset.Modified thinset does not even contain the "latex" that would impede drying when placed between two impervious surfaces.
Modified Thinsets contain Acrylics and Polymers that make it stronger,more flexible and less prone to degrading than unmodified thinsets.

Remember this while shopping or listening to so-called "pros" many of these "pros" installed it wrong for many years and caused thousands of dollars in damage to many homes, some of you are fixing the 'pros" errors, now that is whay you are buying a shower prep system.

You as the consumer (or installer)... look at the facts, do not ignore the laws of physics they will not change at our whim. Men can theorize but the facts are still the facts.
Stay tuned for the Uncoupling membrane blog.....Coming soon..