The areawall should extend beyond the window rough opening by 3” both sides. Some building codes may require additional clearance. The top of the areawalls should extend approximately 2” above the established grade line and down at least 12” below the windowsill. If in doubt, go with a higher wall since extensions are difficult to attach. Fill the space below the window well with select gravel for drainage. Flanges should be attached to the foundation wall at sufficient points (12” centers minimum) to assure structural stability. Use masonry nails, self-drilling anchors or other approved fasteners. Select backfill material should be used, such as granular with some clay that is free of large rock and earth clods and should not be frozen material, sod, cinders or other active soils. The load carrying capacity of the areawalls is largely dependent upon proper backfill procedure. The fill should be placed evenly around the areawall in 12” layers using ordinary compaction making sure the shape is not distorted. On larger sizes a 90 % density factor may be desirable. Compacted fill around the outside of the areawall should be at least 12”, or one-half of areawall projection. We recommend supporting the areawall inside face during the backfilling procedure. Supports should be left in place until construction activity ceases. On larger and deeper areawalls, care should be used in selecting the grade and style.

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