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absorka 11-02-2006 12:28 PM

Floor sealing on balcony over living space
We are in the midst of new construction and have a 2nd floor inset balcony that is over living space and under roof. It is 6' deep by 16' wide and covered under the primary roof line. However, it is open to the elements on the south side.

The designer called for the floor joists to be sloped 1 3/4" in 6' and at least 1" below the adjacent plate line, which we did. It also calls out for "none permiable membrane" to be installed on the 3/4" T&G subfloor.

We would like to put tile on for the finished floor. My question is what is the best method to achieve this considering the need for moisture barrier? I have looked at EPDM 45mil liners which can be had in a complete, unseamed, sheet. However, I would assume we need to put down backer board to adhear the tile. This would require fasteners to penetrate the liner. Is this going to open up a potential leak point? What is the way to proceed?

Thanks for any input.


mdshunk 11-02-2006 05:57 PM

Use EPDM and set your tile in an old fashioned mud job. Basically, you're making a very large shower pan. Do a search on how to do a tile shower pan.

absorka 11-03-2006 02:54 PM

Thank you for that. I will do a search. Sounds practical to me.


troubleseeker 11-03-2006 06:36 PM

The edpm is great for this application, but don't penetrate it under any circumstances. I like to sister every joists or close the spacing into 12oc (if the framing is not done yet). The extra cost is minimal for this size, and you can bet the joists were not sized for the extra weight of a mud bed.All the failures of this type of tile decks I have seen were directly caused by the joists deflecting over time and cracking the grout line and tiles, and letting water in to rot the poorly protected wood beneath. Keep a nice thick 2" mud bed, and use plaster lath for reinforcement.

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