Penetrations, Beam Pockets and Blockouts Review

This lesson identifies the common penetrations cut into ICF walls and the methods for forming and sealing penetrations, beam pockets, and blockouts.

It’s important to understand how to properly create penetrations in an ICF wall using PVC sleeves to prevent compromising the wall’s structural integrity and strength. Many services may require a penetration: electrical or generator service, telecommunications, water, sewer and septic, natural gas or propane, geothermal, and AC lines, plus ventilation for kitchen and range exhaust, bathrooms, dryers, heat-recovery ventilators, and furnaces—and access for satellite, cable, internet, telephone, or even a pet door. Build the sleeve to the size required and no larger; PVC pipe is typically used, extending several inches past the ICF until the wall is poured. Seal around the sleeve on both sides with spray-foam adhesive to prevent concrete leakage. Where multiple penetrations sit close together, brace and strap as needed and vibrate carefully to consolidate the concrete fully around them. When cutting, keep debris out of the wall cavity—and remove any that falls in before pouring.

When installing beam pockets, consult your engineer for the correct bearing-plate height and beam size. Cut out the foam and web ties to accommodate the bearing plate, then brace the back of the pocket with ¾-inch plywood or 2×4 scabbing to support the foam panel where the webs are cut. Reuse the cut-out EPS to bulkhead the sides, or build small wood bucking to hold back concrete on each side, securing the bulkheads with foam adhesive and/or screws so they don’t move during the pour. If a bearing plate is needed at the base, insert it after pouring—you want the pocket concrete slaked but still workable. Pocket height is critical: shoot every beam pocket with a laser level to confirm placement, and on solid foam, cut slightly larger than the pocket size, then secure and pour in place.

Be sure you plan for beam pockets ahead of time. Beam pockets affect other trades—framers and truss engineering especially—so during plan review, note and plan their locations. If the plan suggests you’ll need a beam pocket, coordinate with trades and engineering for specifications and placement, and add those locations to your pre-pour checklist.