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Hardie Cement Pre-Painted House Siding: How Are Nail Heads Handled ?

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Hardie Cement Pre-Painted House Siding: How Are Nail Heads Handled ? Robert11 08-05-2006
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Posted by Robert Gammon on August 6, 2006, 6:37 am
Larry Caldwell wrote:
> @yahoo.com (Robert Gammon) says...
>
>
>> Be aware, priming and painting is a all side proposition. Hardie siding
>> panels are ONLY primed/painted on the Top Side. All cuts and the back
>> side need to be primed for long life and any exposed nail heads and
>> seams need paint/caulk.
>>
>
> Why in the world would you back-prime cement siding? I can see it with
> wood, where you nail the siding up against the sheathing, but cement
> board needs an air gap to keep condensation from rotting out the
> framing. With proper ventilation, painted one side should be fine.
>
>
Hardie Panel or Hardie Plank both are heavy paper coated with cement.
When they are in long term contact with moisture, they will fall
apart. Nailed to the frame, there is NO air circulation, so if
moisture gets behind the siding, it will fail.

Failure to prime the backside was a common, almost universal building
practice here in the early 1980s. Almost all of these homes have had to
have their siding replaced as a result of the builders NOT following
mfg's directions with wood siding.

Posted by George on August 6, 2006, 9:39 am
Robert Gammon wrote:

>>
>>
>> Why in the world would you back-prime cement siding? I can see it
>> with wood, where you nail the siding up against the sheathing, but
>> cement board needs an air gap to keep condensation from rotting out
>> the framing. With proper ventilation, painted one side should be fine.
>>
>
> Hardie Panel or Hardie Plank both are heavy paper coated with cement.
> When they are in long term contact with moisture, they will fall
> apart. Nailed to the frame, there is NO air circulation, so if
> moisture gets behind the siding, it will fail.
> Failure to prime the backside was a common, almost universal building
> practice here in the early 1980s. Almost all of these homes have had to
> have their siding replaced as a result of the builders NOT following
> mfg's directions with wood siding.

OK, but the OP questions were about Hardie plank and not wood. Hardie
doesn't mention anything about painting the backside.

Posted by Larry Caldwell on August 6, 2006, 1:03 pm
@yahoo.com (Robert Gammon) says...

> Hardie Panel or Hardie Plank both are heavy paper coated with cement.
> When they are in long term contact with moisture, they will fall
> apart. Nailed to the frame, there is NO air circulation, so if
> moisture gets behind the siding, it will fail.
>
> Failure to prime the backside was a common, almost universal building
> practice here in the early 1980s. Almost all of these homes have had to
> have their siding replaced as a result of the builders NOT following
> mfg's directions with wood siding.

You are missing the point. Cement based siding has been on the market
long enough for the first wave of house repairs to start coming in. It
has become obvious that you do NOT attach cement board siding directly
to the sheathing. Cement board siding WILL draw moisture, particularly
on the north side of the house, causing rot in the sheathing and
framing. The way to avoid that is to install thin furring strips to
space the siding off of the framing enough to provide air circulation
between the siding and sheathing. Lath will work, but most installers
now use 1/2" treated furring strips.

With proper ventilation behind the siding, back priming is not
necessary.

Posted by on August 6, 2006, 2:14 pm

> Hardie Panel or Hardie Plank both are heavy paper coated with cement.
> When they are in long term contact with moisture, they will fall
> apart.

WRONG .. .. .. I've seen samples of Hardie product sealed in a block of
Lucite filled with water .. .. there was absolutely no evidence that the
material was in any way affected. This is/was, in fact one of their
main selling points.

Posted by Robert Gammon on August 6, 2006, 7:48 pm
<<<__ Bob __>>> wrote:
>
>> Hardie Panel or Hardie Plank both are heavy paper coated with
>> cement. When they are in long term contact with moisture, they will
>> fall apart.
>
> WRONG .. .. .. I've seen samples of Hardie product sealed in a block
> of Lucite filled with water .. .. there was absolutely no evidence
> that the material was in any way affected. This is/was, in fact one
> of their main selling points.
Put any Hardie product in direct contact with dirt where rain falls on
it, and TRY to pick it up two years later.

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