I plan to add fiber-cement siding over existing t1-11 siding that has tyvek housewrap under it. The T1-11 will in effect be the sheathing for the new siding. Should I add another layer of housewrap over the T1-11 before the new siding?
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Can't think why. If I were doing this and wanted to add security, I would use tarpaper - and I'm normally a Tyvek guy.
Let me give you my reasoning. I assume you are adding this type siding for a quality lifetime wall. You already have a barrier against wind infiltration. Water can be expected to be blown through the penetrations in the siding surface. So you need to protect against water - not wind. Tarpaper will do the better job of that. For a lifetime.
BTW, are you using furring strips or placing siding directly over the old.
My first post on this forum.....
The owner builder home we are building is sheathed with osb. We are going to use hardi plank siding. I realize the recommendation is to use tyvek or similar under it. I am fond of the old fashioned "buffalo board" and think to use it instead - as a breatheable air barrier by crossing the osb joints - using it between the sheathing and the sideing. It is not much more expensive than tyvek , has some insulation value, and I think it breathes better. The only possible down side I can see is if a considerable amount of water can be blown under the siding perhaps it would run down the house wrap better than the fiber board.
Secondly, anyone know if hardi plank can be nailed in sub zero weather?
Lastly, you mentioned furring strips, I would have thought a concrete product would not need them.....(and I'd like to avoid creating space for another zillion cluster flies to hide.)
Any thoughts for this owner/ builder are appreciated.
Thanks, Dale in Minnesota
A major reason for the furred out rainscreen system is to allow moisture to drain out and to ventilate out. This protects your whole wall as well as the back of the siding. I understand the fly thing. You can go crazy with screening and still find them moving in. But you should be pushing up daisies before Hardiboard needs to be replaced and anybodysees them..
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