Quote:
Originally Posted by harborlady
hardie house wrap is available now, and according to the licensed installer it's not optional for moisture control/hygric barrier. I had it included in a recent estimate. They don't recomend installing hardie board over anything previous, nor do they consider felt paper good enough as barrier. My wood clappboard must come down as part of the job for this old house.
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Thats strange.....The Hardie Co. Tech dept. was "strongly recommending to me" 15# felt as the best option not very long ago, just before they developed their own product.
That sounds like somebody has found a good way to sell lots of their new housewrap without any recourse. I suppose they require it for their warrantee also???
Did they tell you what the "perm rating" is for the new hardie wrap?
Did they discuss with you the "total envelope and moisture control" inside the house walls? This is critical.
Do you have a "1 mil minimum" water barrier primer under the paint on the outside perimeter walls of your home?
What do you have for wall insulation?
Are you concerned about mold inside of the wall cavity?
I hate to say it but I would question the advice you are getting and if I were you I would call the Hardie Tech dept. and discuss this with them.
I found in talking with installers here, that most of them are full of you know what. If it turns out what he is suggesting is OK then you have lost nothing.
Here where I live 95% of the homes built have an OSB 7/16" sheathing or
1/2" exterior plywood nailed over the studs for structual issues and nailing purposes. That is the reason for the TYVEK Drain Wrap. It allows moisture between the siding and the sheathing to escape to the outside preventing rot.
I think the reason to remove the clapboard could be to eleminate any uneveness for the hardie to go over, Or maybe it's because they will be able to charge you for the labor of removing and disposal.
It's called single walll construction here when no sheathing is applied to the outer wall over the studs. It is only used on low end homes and other buildings here to reduce the overall cost of construction. They allow it if you use 2x6 outerwall studs.
I would be concerned that they want to remove the clapboard and reduce the structural integrity of the building. Hardie siding offers very little in structual qualities. Just hit it hard with a hammer and see what it does. Bump the corners and it will crumble. Pick up a 12ft. board and bounce it up and down and it will snap. Overdrive a nail and see it smash.
A heavy wind or earthquake could possibly wrack the building without lateral support.
It's your house.
Silverfox