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Old 02-14-2012, 07:46 AM   #1
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HardiePanel over concrete block


I want to update the exterior of a 1950s concrete block home. I was thinking of using HardiPanel as a new exterior finish. It would also allow me to re-frame the window openings and install modern windows, currently it has a mixture of single-glazed jalousie and huge single-pane windows.

However, I can find absolutely no info on installing over concrete block, just wood and steel framing. If it's on the Hardie site, it's well-hidden.

It seems that you could simply attach the panels directly to the blocks, using powder-actuated fasteners.

Any ideas?

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Old 02-14-2012, 08:52 AM   #2
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Well, after some experimentation, the PA fasteners won't work. The plastic guide fins stay around the nail and you'd have to individually remove them. Back to square one.

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Old 02-14-2012, 09:32 AM   #3
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HardiePanel over concrete block


look at hardies rain screen detail,your going to need to fur it
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Old 02-14-2012, 09:46 AM   #4
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HardiePanel over concrete block


Why not add foam insulation, fur it out and use vinyl siding instead?
That would be killing two birds with one stone.
I'll try and remember to post a picture later today of one I'm working one.
Those Hardi Panels love to shatter when applying, should not be installed close to the ground, brittle on the edges. Just go through a pile of them at the lumber yard and see how many are broken even before there installed.
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Old 02-14-2012, 09:46 AM   #5
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HardiePanel over concrete block


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Originally Posted by Tom Struble View Post
look at hardies rain screen detail,your going to need to fur it
Yeah, that's pretty much the same conclusion I've come to. I'm concerned that the HardiPanel will have that airspace behind it, seems like it wouldn't be hard to crack/break it. I suppose I could put rigid insulation in there, but that's a lot of expense for very little gain (in Florida).
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Old 02-14-2012, 09:50 AM   #6
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HardiePanel over concrete block


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Why not add foam insulation, fur it out and use vinyl siding instead?
I really dislike working with vinyl.
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Old 02-14-2012, 09:55 AM   #7
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HardiePanel over concrete block


What is it about it you do not like?
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Old 02-14-2012, 11:13 AM   #8
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Originally Posted by workshopaholic View Post
Yeah, that's pretty much the same conclusion I've come to. I'm concerned that the HardiPanel will have that airspace behind it, seems like it wouldn't be hard to crack/break it. I suppose I could put rigid insulation in there, but that's a lot of expense for very little gain (in Florida).

it's best to have an airspace with fc,

hardie is actually pretty tuff impact wise

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