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jeffnludlow 01-26-2009 01:09 PM

cement siding over T-111???
Greetings and thanks in advance for any thoughts,

I live on coastally in central Florida. I have a one story 2x4 frame home with plywood siding. The bottom of the siding is rotting. My plan is to remove atleast 1 foot of siding around the complete house and remove more where necessary and replace with 5/8 plywood. Then I will reside with vinyl or cement siding. My house is short so I think I'm leaning toward a board and batten look. I have a few questions. First, should I use pt plywood if I plan to install j-moulding to flash the bottom wood siding? Second, what vaper barrier and or insulation combo would you suggest? And , what is your preferance for siding materials? I think I'm leaning toward 4x8 sheets of cement fiber with wooden painted battens on 12 in centers. Any thoughts are greatly appreciated.

jeffnludlow 01-27-2009 09:43 AM

I'm hoping someone has some advice for me regarding residing.

samjack 01-27-2009 10:21 AM

I looked into this a while back and found this post on another forum helpful:


Jer 01-27-2009 02:42 PM

You wont need PT ply unless it will be in contact with the foundation. As far as insulation/barrier it would depend on how well you are already insulated for your area. In fla. you might be fine with just Tyvek under the fibercement (much preferable to vinyl IMHO). For your battens I would avoid wood and use in order of my preference: 1- Azek trim which is pricey but worth it if you are planning to stay in home long term, 2- hardi trim or 3-miratek or Tru-wood choice trim.
Hope this helps

Termite 01-27-2009 02:55 PM

Another consideration is that the plywood siding on your home now, if nailed directly to the studs, is serving as a shear wall to resist the wind loads you guys get during tropical storms and hurricanes. Removing only a foot along the bottom severely compromises the home's ability to resist uplift forces and wind. My suggestion would be to remove at least a couple feet of the T1-11 and nail the heck out of the new plywood to the studs and the anchored bottom plate. PT plywood is not needed.

Nothing wrong with fiber cement siding. Great product, and the T1-11 should be a good substrate for it. A water barrier should be installed behind the cement board however. I'd use building felt.

jeffnludlow 01-28-2009 06:12 AM

Thanks to all suggestions. I'm looking into additional options currently. I'm also replacing my windows. I'm not familiar with the proper sequence to flash the openings. Would it be different if you used felt, tyvek, or drain wrap? The pvc trim sounds good. Is it paintable? Thanks again.

Jer 01-29-2009 05:28 PM

Yes the azek trim is paintable and a very good product.
If you are changing windows, and the best time to do it is right before or along with re-siding, the barrier you choose wont make any difference from a window install stand point.

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