We’ve received several quotes and they are charging material and labor by the “square” we were told is 100 sq ft (10’ X 10’). The prices are from $800/square and up (and we mean WAY up). We looked at a local box store and the Hardie Plank (7-1/4” X 12’) is under $5/each. This means for 20 of these planks we’d cover 10ft tall but 12ft wide or 120sq ft for around $100. This also means these places are charging around $700 per square to install it. And they were all talking of putting it right over top of the existing paneling since it’s not in too bad shape, to add an extra layer of insulation.
So we’re looking at doing this ourselves. A couple questions we have. The Hardie Plank requires a water resistive barrier but we’re wondering that since we’re going over the existing paneling which has a foil back insulator under it, do we still need to do this? They also speak of putting down a joint flashing layer under the planks but once again since, we’re going over the existing paneling, do we need to do this?
If anyone has experience with this and can let us know if we need to do this barrier, we’d greatly appreciate it. And any advise, warnings, suggestions or any words of wisdom about Hardie Plank siding would be appreciated.