hardi siding

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[Kapohocat]

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Originally posted by Mauka

Hey, I like how the Hardie looks, too. But according to them, it has 0 insulation properties on its own.
I don't mind the look of the T-111, but the Hardie doesn't have to be painted for 25 years.
Do you know a good contractor with experience with the Hardie siding?

Thanks

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On new home construction, you have to use plywood sheathing for shear strength behind the hardi.

As for insulation, its just not cold or heat but also the sound attenuation properties. The hardi does have some insulation for sound.

I do know people to install it - you looking for just labor or a GC? or try dakineworkers.com

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[Jay Bondesen]

In cold country, or hot country, where you need to to deal with temps 30 degrees out of our comfort zone you could use furring strips to create a space between the Hardi plank and the existing sheathing. Then you have a space for foam board and then a wrap. It's costly and challanging to trim out windows and doors after that but you do end up with insulated walls. As Rob mentioned there are preformed insulated panels out there too. Unfortunatly I think most heat loss or gain is through the roof.

Jay

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[Rob Tucker]

As for heat loss: I was involved with Naval engineering on an energy study. Results were that walls and roof insulation performance tended to max out at a bit over R-20. After that the windows and doors were the big loss areas.

[DanielP]

Relying on my poor memory about heat loss, only about 15% is attributable to walls. 25% to air leakage 25% to single pane windows and 35% to ceilings. I would suggest, for temperature control, insulating the ceiling or roof and run a ceiling fan in reverse at night to move the warm air around. Go after the air leaks and windows. Walls last.

Dan

[ericlp]

Yep... Most of your heat loss is generated in the ceilings since heat rises. With out double pane windows and proper insulation in the attic (proper "R" value) your wasting your time trying to insulate the walls. Maybe your best bet might be passive solar. Hook up a few panels together and after the sun heats up the water from the collector and stored in a hot water heater you could cycle that to radiant floor heating in the cold mornings. I'd look at all options. Preferable clean energy options vs running a gas stove or electric heaters.

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[DanielP]

You don't need an attic to insulate the ceiling. I think that the easiest method is to remove the roofing and install ridgid foam between 2x4 "sleepers". Alot easier and much more effective than re-siding.
Dan