Get rid of the rot.
Can hardiplank be installed over existing siding.
This is the main task to tackle to make sure that there are no preexisting issues on the home.
The hardie website is unclear on this issue.
It s a perfect application for it because t 111 is nothing more than a textured plywood and a plywood makes a great sheathing.
Or directly to minimum 7 16 thick osb sheathing.
And if a board does get wet but is not sitting in moisture for an extended period of time you can simply let it dry out before installing.
Does this mean that hardieplank cannot be installed directly over existing wood siding without voiding the warranty.
James hardie provides a 1 year limited product warranty for hardiepanel used as skirting on a mobile home.
Hardiplank lap siding can be installed over braced wood or steel studs spaced a maximum of 24 o c.
The actual question is should the current siding be removed with osb installed or should the current siding remain to act as a substrate an additional layer beneath the top layer under the new hardieplank siding.
Something you will want to keep in mind when making this decision is how long hardieplank will be on your home.
Several contractors have suggested that the wood siding need not be removed.
Yes you may be able to save some money by not removing the old siding but that old siding could be hiding problems that may bite you down the road.
According to the best practices manual from james hardie existing siding can be used as a substrate as long as it is in good condition meaning that it is not warped bowed curling delaminated or rotting.
More than 50 years.
However it needs to be installed in accordance with our written installation instructions for hardiepanel siding in regard to framing joints paint and clearences above ground.
This would be on an older house but the wood siding is in good condition.
Get some regular cdx plywood the same thickness as your t 111 fill in the gaps put the tyvek on there put the hardie on there.
Hardiplank lap siding can also be installed over foam insulation up to 1 thick irregularities in framing sheathing and or foam insulation can mirror through the finished application.