Need some advice on the above please,Read many topics on how to perform the necessary tasks and i have plans to lay loft boards on top of 3x1 batons(ventilation purposes)solely for storage reasons.My 2 question"s is this,My house is over a 100yrs old,mid terrace.I have seen pics on the net of some attics and the RAFTERS look to be a lot bigger and wider than those in my attic.After a quick measure of my rafters they are just over two inches wide and depth to the ceiling is four.(1)Would the rafters be up to the task of carrying the weight of the boards?(2)The space to cover is 15'x25',How many 8'x2' boards would i need!Thanks