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Question DetailsAsked on 5/24/2017

does craneboard have off gasses? does Hardie cement board have off gasses? can hardie go over stucco?

Seriously considering having Craneboard 7 siding installed on our whole house . Was reading about off-gasses and got worried about the off gasses of Vinyl and the problems it causes for landfill. Also worried about getting moisture under it . Live in Sacramento California and it gets hot here. Only have siding on front of house now. Rest of house is stucco. Thought it would look nicer to have whole house done. Also, thoughts on covering the eaves with the flat soffett board? Also did some research on Hardie board. But wondered if it can safely go over stucco? Is it too heavy to stay on?

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Voted Best Answer

Being made of vinyl and foam insulation certainly the Craneboard will outgas more than the basically concrete Hardi board (unless you get insulation backed Hardie board), but since both should be placed over a vapor retarding housewrap in almost all cases, the amount that will get into the house should VERY minimal - probably a wholehouse of siding will not put more into the house than you bring in with home electronics and plastic food containers and such.

As for landfills - pretty much everything that goes into landfills causes harmful gases and leachates - that is why modern landfills have capping, gas extraction, and leachte recoveary and treatment systems. Vinyl siding is certainly far from the worst thing going into landfills - I would say if you are really worried about that never again buy a car, electronic device, CD/DVD, plastic wrapped food or household consumable, etc.

My bigger concern would be vinyl siding in Sacramento summers, because vinyl siding products have long-standing issues with blistering and warping in summer heat, especially where window reflections hit already-hot siding. Hardiboard or Hardiplankor equivalent products would not have that potential issue.

Regardless of the siding type, it should NOT be tied to the stucco - it will normally (over stucco) be mounted to wood firring strips, which will themselves be screwed through the stucco into the studs, which can carry the weight fine.

Soffit boards - a lot of people like the look, but you have to be sure to provide LOTS of ventilation air to the eaves (assuming you have a ventilated attic) - generally, the open area of the soffits needs to be about 50-100% greater than the minimum ventilation airspace for the eaves/ridge vent to avoid restricting airflow into the attic. Soffit covers Very commonlyi are under-ventilated. And of course, especially in your area, they need to be insect screened - which pushes the soffit cover open area requiremetn up to 100% of eave area or more, so a LOT of your soffit covers will have to be screened openings, not solid.

BTW - you said you thought it would look nicer with siding on the entire house - maybe, maybe not - try pasting up some web printouts of siding onto full-page photos of your hosue to see just how it will look - siding 3 additional sides of the house for appearance sake is a lot of $ you might prefer to put to another use - or to your retirement fund or kids college fund or such, because you are likely talking $10,000-20,000 additional for the other 3 sides.

Here is a previous question about siding types which might also be of interest:

Answered 3 years ago by LCD

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