Asked on May 04, 2014

We have an aluminum frame lanai.....we tried to finish the inside bott

MaryJane Harris
by MaryJane Harris
We tried to close in the lower bottom on the inside, using styrafoam, and over that luan plywood....we did caulk, but mold formed near the floor....we know there is condensation, metal getting hot and cold, temperatures etc....we have taken this down,but still want to attain that finished look....any ideas to stop the condensation, mold from forming
  8 answers
  • Funnygirl Funnygirl on May 05, 2014
    Need a photo. Mildew from no ventilation
  • Z Z on May 05, 2014
    I"m sorry, but it's really impossible to help without photos Mary Jane.
  • MaryJane Harris MaryJane Harris on May 05, 2014
    we want to stop any dampness from getting into this area.we chalked, put styrofoam panels,painted luan. This time we intend to paint both sides of luan, more chalking
    • Z Z on May 05, 2014
      @MaryJane, is the outside panel aluminum too? I'm thinking you may need to caulk the outside of it too. The more photos you share the more we can help.
  • MaryJane Harris MaryJane Harris on May 06, 2014
    yes.....that panel is aluminum...both sides....I am going to paint the outside and recaulk. Will take outside pic....
  • Is the area above this panel open screen? I have family in Bonita, and from what i know about the moisture in the air, you do not want any kind of wood paneling outside. Luan is an interior material. They make exterior grade plywood with finished faces.....but even with that, I still don't see it lasting a long time.
  • MaryJane Harris MaryJane Harris on May 10, 2014
    area above is vinyl windows
  • The humidity within the room is condensing on the cold metal, While the insulation may have prevented the heat loss in the room, it was not perfectly tight and the moisture worked around it to a point where the condensation formed. In addition the metal frame that you fastened the panel to is transmitting the cold temp to the surface of the contact point where the panel was fastened to. This cold surface was enough to allow moisture to condense causing the mold development. To do this correctly you need to use a closed cell foam board. These are the ones with the aluminum foil and or plastic on the sides. Cut the foam so it fits tight to the frame. If there are gaps use slow expanding blue colored great stuff foam from a can to seal any gaps around the foam to the metal, Once that is done, you need to install a complete panel that covers all the metal framing members. When done you should not see any metal framing that is going to be covered with panel. A 1 inch thick foam board will work well here. Then run a bead of silicone caulk around all the edges of the foam boards where the luan panel will be coming into contact with. Then while the caulk is still wet, place a 6 mil plastic sheet on the wall to assure that no moisture will come into contact with foam face. Once fastened then apply the paneling. If any metal is exposed before the panel is installed you will be removing the walls again to fix the mold.
  • Margaret Nelson Margaret Nelson on Oct 02, 2018

    I am in the process of doing the same thing. I have used flex seal inside and out which is helping with the moisture. My problem is once you put the insultation in what did you use to cover it. I have sheetrock but am not sure that is how I should go. Can you give me any suggestions?