EIFS Samples

The Making of the EIFS Samples

These samples will be used in the research experiment

We will be making 3 samples for the experiment. One sample using an old version of the barrier system. One using a cloth barrier and mechanical fasteners with a drainage system. And a sample with a liquid moisture barrier with a drainage system. This post will focus on the actual creation of the three samples. We will go in depth on the materials used and exactly how they were made. Each sample will be made on a piece of OSB. The object of this research is to determine the affects on the OSB from the system once we introduce moisture behind the system. The experiment will be designed to allow water behind the EIFS much like a failing area on a home. For example a missing kick out flashing that is allowing roof run of water to infiltrate the Synthetic Stucco. Now that we have a little background it’s time to explain how each sample will be made.

  1. Old Barrier System – You would see this being done in the 80’s mostly. With this sample we are going to adhere the foam to the OSB with the Exterior Insulation and Finish System cement (back in the 80’s we were using a glue, which has been discontinued). For the purposes of this experiment the cement will work fine and was used a lot in the 80’s. There will be no barrier between the OSB and the foam at all. Then the foam will be sanded and a coat of Alpha Base-coat will be applied with reinforced fiberglass mesh embedded. Once that drys a coat of finish will be applied. 
  2. Cloth Barrier and Mechanical Fasteners with Drainage – With this system the OSB will be covered with a cloth barrier that is ribbed for drainage. A track will be installed at the bottom and the cloth barrier will be dropped in the track. Then the foam will be attached to the OSB with the mechanical fasteners. The foam will be sanded and the Alpha Basecoat will be applied over the fasteners and then over the entire area with the embedded fiberglass mesh. Again at this point a coat of finish will be applied.
  3. Liquid Moisture Barrier with drainage – The surface of the OSB will be painted with a liquid moisture barrier (two coats). The the track will be attached at the bottom and the liquid moisture barrier will extend down over the track using a fiberglass grid tape pr cloth. The foam will be adhered to the substrate with the Alpha Base Coat making sure all ribs are vertical to create channels for moisture to drain. Again the foam is sanded and the Base Coat is applied with the mesh embedded. After it drys the finish coat is applied.  

The first system is not a drainage system and that is why it does not have the track installed. The other two systems are drainage systems and the idea is that if moisture finds it’s way behind the system it will run down the barrier into the track and out the weep holes in the track and not affect the OSB. We are about to put them to the test and see how well they fare.


Old Barrier SystemCloth Barrier & Mechanical FastenersLiquid Moisture Barrier
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Research EIFS Samples by Corey Turcotte




The Making of the EIFS Samples