Wood sheathing with gaps and loose siding

I’m not sure how to describe this sheathing under this vinyl siding. No caulk, no battens, no overlap. What is this construction called and how would you write a narrative for it?


Why… what’s wrong with it… besides no visible WRB?

Looks like a piece of lumber with a piece of siding material attached to it, (crawlspace hatch)?
Means nothing in and of itself!

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What I see in your picture is vinyl nailed to regular old wood boards. It’s called wood.

“Hardboard” refers to a man-made product that is made from wood fibers and glue that is pressed and heated in a mold.
Also called pressboard, masonite, and several other names regionally.

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There are apparent other installation issues. For example, why were you able to lift the siding out of place along a course? Did you have the siding removal tool/jig? Is there a proper transition from the siding to that ribbed metal panel? Furthermore, I have seen furring strips, plankboards, etc., behind vinyl siding, so the photo does not tell us enough. Any photos further back?

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It’s like this in every area that the vinyl siding has come off. I’m thinking these gaps between boards would allow air & pests pretty easy access.

Ha! Thanks for the correction.

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Here is one way to transition to metal…Fast forward to minute :50 or so to see the transition strip.

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In the end, a good wind is going to rip that siding to shreds.

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Manufactured / Mobile Home??

Let’s see what is on the other side of that siding, (from the crawlspace)??

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Siding was poorly installed. Among the significant issues observed: Some fasteners were missing, starter strips were not found, there was no house wrap, vinyl siding was loose. The exterior walls are vulnerable to rainwater damage and strong winds could remove loose and poorly attached siding materials.
There may be hidden damage that was not visible on the day of the inspection due to the wall covering. I recommend further evaluation and quotes for repair by qualified siding contractors prior to the expiration of your inspection contingency period.

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It should have house wrap on it, but the boards look pretty good for not being protected. It could be worse.


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Wood of all types has to be spaced to allow for contraction and expansion. So the gaps are required even if you use OSB panels, plywood or 1x6’s for sheathing. This is true no matter where it’s located, (on the roof, on the wall or the floor). Also before house wrap was invented it was not uncommon to nail siding directly to the sheathing (though sometimes they used felt paper).

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Going back tomorrow to crawl under after the owner/contractor opens it up. The skirting was embedded into the ground, overlapped, screwed together, and under the vinyl.

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