Moisture related problem – rainscreen
Zone 4c
3/4” furring strips untreated CDX, Coravent at bottom, w/ air gap at the top. If any other relevant indiscernible details please ask for clarification.
I recently had to take down a few Sheets of hardiepanel in order to do a minor change of something I changed my mind on. After pulling a few sheets down that had been up for about a year now, I noticed that the closer the to the corner, or other edge of my completed work, the more the CDX had dark speckles (mold spores?) on them (see pictures) as well as faint, but still dark speckles in a good number of places where my stainless siding nails penetrated through.
this was not a completed job as I left my corner trim off – heaviest amount of darkness – and have not caulked any seams anywhere.
please, I want to know if there is something wrong with my system…
if I need to allow these particular furring pieces on the edges to dry out before replacing or if this is to all be expected given it was left for a full season without even being covered in some places?
specifically looking for advice on how to deal with or what is necessary in the future here af far as sealing moisture out:
1) is it a good idea to fill all siding nail holes even though they are or will eventually be covered by batten trim pieces (see image of final design)?
2.（我受到了印象，这并不是真的必要，因为我的系统是自我干燥，并且没有水池的地方）
任何其他建议？谢谢你！
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Replies
任何人有任何想法吗?对不起如果皮克特人ures are hard to decipher, they are rotated sideways on my end at least.
Nothing blocks bottom to top airflow? Slightly angle nails? Maybe replace with treated wood?
谢谢乔恩，不，没有堵塞通风。有趣的指甲没有想到这一点。你说这将是略微向上指甲的理想选择吗？
看起来Hardie呼吁舒适（不冲洗）和级别钉子。但是毛茸茸的指甲可能会受益。
Kevin,
I don't see much to worry about.
The furring is best attached with galvanized nails, but I doubt the commons will develop more than surface rust.
A bit of discolouration is to be expected. The battens should be fine without caulking.
Get it finished, get some paint on it.
谢谢Malcolm，并且对于记录，我确实使用涂层的装饰螺钉附着毛刺，而Galv框架指甲。所以组合。
As far as the actual panel siding fastening, I’m thinking the other gent may be right or at least on the right track because in hardie instructions they say if a nail is depressed upon fastening to then fill in the dimple and re-nail a few inches away.
(To be clear, it wasn’t the furring strips’ fasteners that had the water spots, it was where the (stainless) siding nails had penetrated.)
Probably the concern here with hardie is that ‘countersunk’ siding nails not holding well, but that it also creates a place for water to be trapped. I think I will caulk over at least the Incorrectly driven countersunk siding nails, if not all of the nails on the panels just to be extra safe here. Doesn’t bother me and will give peace of mind.