I have an old Werner quad fold that I needed 12' of it's 16' total length. It fit fine to get me up to the 16 or so foot peak I have in my sunroom but I had to work on the top area and down the angled walls of the room. I guess when they put the room on and painted it, they hadn't used primar on the bare sheetrock and I ended up having scally, loose areas from the top down the walls a few feet.
The little Giant can easily be changed from 4' to full extension, one foot at a time and it's a lot lighter than the Werner. I spent a lot of time up there scrapping and sanding, then putting Pro999/Rx35 a problem solver something or other they recommended at HD after I showed them some pictures of my mess. After that dried I put a skim coat over the bad areas and then sanded it relatively smooth.
I fell in love with that ladder real quick.View attachment 863617