Brick Weep Holes on Insulated Concrete Form Construction

When my insulated concrete form (ICF) house was bricked on the outside, the masons put weep holes every few feet. I know weep holes are needed in wood frame construction, but I’m not sure if they’re necessary on an ICF house. Can I fill in the weep holes, since they attract insects like dirt dauber and wasps? -John

Hi John,

Insulated concrete form (ICF) construction consists of hollow, foam blocks that are stacked to form walls, then filled with concrete to make a structure that is both durable and well insulated. The exterior walls of ICF construction are then covered with brick, stucco, or siding.

Even though the ICF wall is behind the brick veneer, you should still keep the weep holes in the brick open, since moisture can enter the gap between the two walls from condensation, leaks, or driving rain.

Instead of closing the weep holes, try stuffing black fiberglass screening into the holes. The screen will keep the insects out but still allow any moisture to pass through.

Good luck with your project,


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  1. We own a log cabin in Vermont with a finished lower level (uphill side is underground). Have always had water issues on the uphill side, even though the land grade on that side is flat for about 20 feet from the house. Numerous excavators and contractors have told us that the hill is not the problem. Last year, took down the deck, excavated along the foundation, found a minor crack, had it repaired, replaced the dirt, built a new deck. It was dry for several months, but in a most recent 2-day rain event, the carpets were again wet along that wall. In desperation, had the wallboard and tongue and groove paneling removed to find weep holes, but no trough or way for the seeping water to eliminate itself. HELP! Do we fill those holes at the risk of weakening the foundation? or go through the expense and mess of putting a jackhammer to the concrete floors. Please tell me there is another way!

    • Hi, Antonio,

      A stainless steel wool mesh is built to last and should keep rodents out. Best of all, it will not rust or corrode with time.

      Good luck!


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