Saving energy by exterior thermal insulation
- A comfortable space combined with physical protection, enabled by exterior thermal insulation waterproofing

The interior thermal insulation method	Advantages of exterior thermal insulation waterproofing
Conventional thermal insulation material is installed below the rooftop concrete slab. Although the cost is low and air-conditioning works more effectively, the slab is exposed to wide fluctuations in temperature. As a result, the slab is prone to crack easily and existing cracks grow wider. Local dew condensation occurs on metal parts such as hanger bolts.	Because thermal insulation material is placed on the upper surface of the rooftop concrete slab, it protects the slab from solar heating and lessens changes in the slab’s temperature, thus minimizing its expansion and contraction.

Actual measurement of the slab surface temperature

* The graphs show that the daily changes in the slab surface temperature are markedly smaller for the exterior thermal insulation than for interior thermal insulation.

Dyflex's exterior thermal insulation

Thermal insulation material + improved asphalt sheet, mechanically fixed sheet + rapid hardening-type urethane

In Dyflex's exterior thermal insulation method, the thermal insulation material and the improved asphalt sheet are fixed together by an anchor, after which rapid hardening-type urethane is sprayed on the surface. This can be done using a virtually dry method and can be applied on a base in any condition. Therefore, anchored styrene foam, which has low absorbency and maintains its thermal insulation character for a long period, can be used in spite of it being exposed to the elements. Because rapid hardening-type urethane, which shows good resistance to heat, covers the surface, the durability is better than that of conventional exposed asphalt and urethane foam, which tends to lose its thermal insulation properties over time.

Procedure for exterior thermal insulation waterproofing

Pave the rooftop with the thermal insulation material		Cover with the sheets
Fix the sheets with anchors, and place corner cants		Spray rapid hardening-type urethane
		Paint the top coating to complete the construction