I have bought a new house and I want to construct a roof on the upper side. My new house has some parts that need to be modernized, so I want to make some changes in my residential unit. I want to use roof Purlins, but I don’t have ideas of the length of the Purlins. I don’t have clear explaination of it, so I want to take help from someone. Can I use Roof Purlins/MMS for my new house? Please put your opinion here.