意见如下：1.先将出现裂缝房间内的人员转移至其他房间 保证人员安全 2.楼主二楼的使用性质是否有储存功能若有 可酌情减清二楼物品布置 减轻荷载 3.对于裂缝出现位置进行观测 确定裂缝是否有进一步扩大趋势 4.考虑到楼主为农村自建用房，原来楼板为传统大板，参照我小时印象，预制板内部钢筋直径应该不超过6，竖向承载能力较弱，且由于配筋较少 易产生裂纹，可进行裂缝观测 ，确认裂缝无扩大趋势后再考虑加固方案（后续可私）。  若裂缝有扩大趋势 ，需请专业公司进行 现场检测，根据结果进行加固方案布置

看你描述，，这个房子盖的时候就根本没有按要求来盖，用的材料均未考虑抗震，后来又用空心砖加盖，说明盖房子的人完全不懂。那么大胆推测，地基没有处理，也没考虑温度的影响。推测为地基不均匀沉降，加上房屋整体性太差，所以变形过大形成裂缝。严格来说已经是危房。如果当地没有什么地震，比如说江西南部地区，那么居住问题不大，但是以后注意不要堆放过重的物品。

像这种不说地区的。真是无法判断，西北地区还要考虑湿陷性，做好防排水处理。西南地区要考虑红土的膨胀性。东北藏区要考虑冻土的收缩性，湖泊海边地区要考虑盐碱土的变形。

以后说问题，，最好说一下地区，降水对房子的影响什么的。就这样说。太多因素会造成这个结果。

最好加上室内外地面的照片。外部环境。

谢谢楼主分享好资料

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