Apply EPS foam to the substrate

Exterior Insulation and Finish System installation process

There are several ways to apply the eps foam to the substrate. But, before doing so, we need to take a few things into consideration. First, is the substrate itself. There are different applications for different substrates. Here is a list of the more common exterior insulation and finish system substrates.

  • OSB (oriented strand board)
  • T1-11
  • DensGlass / Glass Roc
  • Block Wall
  • Brick

Applying the eps foam over Block, Brick and DensGlass is very similar. The polystyrene insulation board is attached to the substratewith Alpha Base Coat.

The Base Coat is applied to the foam with a notch trowel in a vertical motion which allows for moisture  drainage. All windows and doors should be back wrapped and a 1/2 inch expansion around them. Note; if the block or brick are painted a primer must be used before applying the eps foam to the wall.

When applying eps foam over OSB or T1-11 the process is much different. First the wall is covered with a moisture barrier called stucco wrap. Then the foam is attached to the wall with mechanical fasteners. again, all windows and doors should be back wrapped and a 1/2 inch expansion around them.

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