| 摘要 |
<p>Rough-in for under slab ventilation allows to connect a space under the slab of grade of building structure which contain layer of gravel under the concrete slab with above the ground outside air utilizing 100 mm in diameter flexible solid pipe (# 1 on attached drawing). This connection will make possible to ventilate soil gases accumulated in the space under the slab. Inserted inside of the above noted pipe 50 mm in diameter flexible solid pipe will allow to inject air for drying out soil located under the slab or pump out collected water.</p> |
