my in laws are getting a new pool. the pool will be a pratial in ground above grounder. my father in law and i met with a carpenter today to discuss the deck. i am not master carpenter but i have a few concerns from what ive heard today. first off the pool is a 30x15 with the corners being in the form of an octagon not circular but with angles making the turns if that makes sense. there is an existing 25x9ft concrete slab deck that is attached to the home. the plan is to add 15ft of wood decking off this deck to lead toward the pool. this would come off the 25 feet in length part of the slab deck leaving 10feet on the right hand side open as there are stairs going down to the pathway there which is not going to be a problem for the new deck. on the left side of the pool we are going to follow the angles of the pool with the deck off that 15 foot extension. that part is going to be 10 feet wide. and on the right side we are going to do the same thing follow the angles of the pool only that side is only going to be 5 feet wide. the other end of the deck along the far side of the pool is also going to be 5 feet wide and again following the angles of the pool to connect to the 10 foot wide section to make a full all around deck. the problem i have is with the contractor. he says he likes to use only 12 foot decking boards as they are made better than pre cuts as he calls them(I.E.-6footers,8footers,10 footers) he claims the pre cuts are worse grade material and are not true sizes and so on an so forth. i originally told my father in law to use 10 foot decking boards on the one side and just make the other sides and even 6 foot and get the 6 foot decking boards. my question is why is this guy telling him to uses 12 foot decking boards? seems to me like he wants to cut all day and have a ton of extra scraps leftover. i am looking out for my family and i believe this guy is looking to make money standing and cutting boards to length. am i wrong or is this guy telling the truth about 12 foot boards? i understand why he wants to use 4x4x12 for the posts because this pool with be sunken in the ground and u probably will need different size post because of the grade of his yard. but i don't understand why the decking boards need to be 12 feet. much help is needed am i missing something or am i dead on? please help..sorry i dont have a pic of the yard or pool but when i got home i just got to thinking and had to post. i don't want to see my family get rolled for a bunch of cash they truly don't need to spend. i dont want to be misunderstood here. i respect this guys knowlage on most of the project and believe it is gonna turn out phenomenal either way: pre cuts or 12 foot boards. i just cant get over this. is there anything else i may be over looking as well?