Internal protection during lowering
When lowering the Hokkai Void, cover the top of the rebar with a sheet to prevent the rebar from damaging the inside. In addition, we recommend covering the rebar with a curing sheet until the ready-mix concrete is poured.

Precautions when pouring ready mixed concrete
The inside of Hokkai Void is laminated, so when pouring ready-mix concrete, pour it into the center of the tube so as not to let it come into direct contact with the inside surface, and be careful not to damage the inside surface.

Be careful not to get wet or distorted.
If you store it outdoors, cover it with a sheet to prevent it from getting wet from rainwater, etc. Also, if you leave it leaning at an angle for a long time, it may become distorted. Please store it in a flat place indoors that is as dry as possible.

Be careful of impacts and weight
Hokkai Void is strong enough not to break or deform during construction, but please be careful not to subject it to impacts such as excessive loads or dropping heavy objects on it.

Waterproofing the cut surface
Use tape or waterproofing material to waterproof the cut edges of the Hokkai Void and any nailed areas.

Fire Caution
Hokkaivoid is flammable. Please be careful when using open flames near it.