FLOOR HEAT INSULATION STRUCTURE AND FLOOR HEAT INSULATION MATERIAL CONSTRUCTION METHOD

To obtain a floor heat insulation structure and a floor heat insulation material construction method capable of satisfying predetermined heat insulation performance.SOLUTION: On lower side end faces 20B and 34B of floor girders 20 and floor joists 34 of a building 12, first heat insulating materials 44 and 46 formed in a substantially plate shape covering the lower side end faces 20B and 34B of the floor girders 20 and the floor joists 34 from the lower side of the building are provided. Thus it is possible to secure a heat insulating layer having a substantially constant thickness at the lower side end surfaces 20B and 34B of the floor girders 20 and the floor joists 34 where an underfloor space 13 is narrowed, while suppressing variations due to workability. On the other hand, a second heat insulating material 50 is provided between the floor girders 20 and the floor joists 34 adjacent each other. The second heat insulating material 50 covers the floor girders 20 and the floor joists 34 from the lower side of the building continuously with the first heat insulating material 44. For this reason, stable heat insulation performance can be obtained. Thereby, predetermined heat insulating performance can be satisfied.SELECTED DRAWING: Figure 2 【課題】設定された断熱性能を満たすことができる床断熱構造及び床断熱材施工方法を得る。【解決手段】建物１２の床大梁２０及び床小梁３４の建物下方側の端面２０Ｂ、３４Ｂには、略板状に形成されかつ床大梁２０及び床小梁３４の建物下方側の端面２０Ｂ、３４Ｂを建物下方側から覆う第１断熱材４４、４６が設けられている。つまり、床下空間１３が狭くなる床大梁２０及び床小梁３４の建物下方側の端面２０Ｂ、３４Ｂに、作業性によるばらつきを抑えて略一定の厚さの断熱層を確保することができる。一方、隣接する床大梁２０及び床小梁３４同士の間には、第２断熱材５０が設けられている。この第２断熱材５０は、床大梁２０及び床小梁３４を第１断熱材４４と連続的に建物下方側から覆っている。このため、安定した断熱性能を得ることができる。これにより、設定された断熱性能を満たすことができる。【選択図】図２