As freewheelin' as Philippines is, there are some regulations that need to be followed. Even though we'll be living in an isolated area - one step removed from jungle - we still have to get a work permit for the house before water and electricity can be connected. For reasons that are difficult for me to explain (or comprehend) the east side of the house will have to be a firewall in order to comply with the building codes. We control that lot, and there will never be anything built close enough to the house on that side to actually warrant a firewall - but, rules are rules, even here.
The photos show one of the masons working on this firewall. The string shows the final level before the first story ceiling (aka 2nd story floor) is constructed. There are still a few more things that need doing before that stage, but it won't be much longer.