As with any form of below-grade construction, waterproofing is required. Recommended waterproofing of ICFs consists of a protective sealant to the EPS foam, coupled with a drainage mat surrounding the foundation wall. A drain at the footer is recommended and may be required by code. ICF foundation walls should be allowed to cure for a minimum of 7 days and the first floor set in place or the top of wall braced prior to backfilling. The backfill material should be well drained and free of construction debris and large rocks. Once in place, backfill should be properly compacted and graded so that water does not collect around basement walls. Landscaping should be kept clear of the immediate perimeter to prevent accidental water damage from irrigation.