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Old 12-14-2010, 08:58 AM   #1
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hardi over stucco lath?


We have lost confidence in the entire way our house has been prepped for stucco. Water intrusion is a huge concern and now we'd like to just get out of it...... any thoughts on leaving the lath on (huge job to remove) and putting hardi board over it instead?

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Old 12-14-2010, 12:39 PM   #2
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hardi over stucco lath?


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Originally Posted by hummmystic1 View Post
We have lost confidence in the entire way our house has been prepped for stucco. Water intrusion is a huge concern and now we'd like to just get out of it...... any thoughts on leaving the lath on (huge job to remove) and putting hardi board over it instead?
I have no idea what you're trying to accomplish, and with the scenario you are planning, it doesn't seem like you do either.
Try explaining the, "loss of confidence" issue and why you think you know better as opposed to hiring someone who does.
Ron

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Old 12-14-2010, 01:32 PM   #3
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hardi over stucco lath?


It's a long story, but basically we're working our way up the ladder of 'quality' as far as builders go.....on a home designed and built 'organically' (ie. no
architect/plans).....Using lots of salvaged and craigslist materials...trying to stretch the dollar as far as possible. After many problems, we replaced the initial builder w/ a more reputable one, who fixed the first guys mistakes, but now his work too is in question...specifically as they have done lath/windows/flashing. So it's supposedly ready to stucco, but have had some other professionals out to assess the job and the consensus is the work is inferior.....wrong kind/improperly fixed window flashing, casing bead instead of weep screed at base....spots where OSB is visible/gaps in black paper....Long staples poking through everywhere in OSB to the inside...only one layer of paper...... just about everything I've read can go wrong where we'll be open for mold/rot. So now we are talking with a builder with very good reputation, and it was our thought that rather than risk troubles with stucco down the road, just go ahead and cover with hardi. (after fixing the window flashings). This guy says that can be done....and for less $ than stucco/elastomeric paint (which would be needed to protect against weakness of water-shedding layer). But second opinions are a must for me at this point......Do you see any reason hardi could Not be put on over lath? (It's just the flat kind from HmDepot.)
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Old 12-14-2010, 02:30 PM   #4
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hardi over stucco lath?


I think the lath will crush where the nails are put into the siding causing a dimpling of the sidng. Instead of laying flat against the substrate, it will be wavy accross the wall.
I think "organically" by your definition is the road to disaster. What is organic structural integrity? And how was it achieved without a knowledgeable person drawing plans?
Who's inspecting this house so it meets codes?
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Old 12-14-2010, 02:49 PM   #5
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hardi over stucco lath?


I don't see a problem other than the small area where the lap siding fasteners pull it close to the sheathing with enough force for the steel lath to cut into the primed backside, allowing water intrusion there from wind-blown rain. The spacing from the paper due to the lath is good: http://www.allcityimprovements.com/r.../airspace.html

http://www.buildingscience.com/docum...rainage-planes

Check with Hardie on the lath backing for warranty…..

Gary
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Old 12-14-2010, 03:25 PM   #6
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hardi over stucco lath?


GBR may remember me from earlier questioning whether lath was put on right side up (it was!)....and your responses were very helpful. I also explained there that I'm the first to admit we've made every mistake in the book going about building a house this way. We live in the country where such things as inspections and codes are not readily enforced....though the builder claimed to be building to code. Believe me, we have learned a lot, and are paying dearly every way for trying to save money that way.

We have had it inspected recently...and thank goodness 'overall' the structural integrity is good, though there are a few 'manageable improvements' still required.

I'm just trying to find a way to salvage the outside now. I had been envisioning the 4 X 8 hardi sheets, which we have on our tiny house now, and could see that being problematic, needing a flat surface to nail to.....but if we use the boards, they should be more forgiving of any imperfections there....just needs to be done with great CARE!
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Old 12-14-2010, 08:08 PM   #7
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hardi over stucco lath?


I hope it works out for you! I have never install lap over metal mesh lath, uncharted waters here..... Set the air pressure lower on the tool, try a few before committing. Flat panel would be a problem at the side joints nailing outboard enough to hit the stud.....

Maybe some others would chime in on possible problems with lap siding for this application?

Gary

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