shiplap

[antichef]

I picked up a copy of Rod Gervais's book, and I've been reading (not the whole thing yet) - I see the part about double wall construction, and would love to go that route.

I'm working with an addition on my house that dates back to the 1930s. It's got a pier and beam foundation (suboptimal, I know).

My plan was to remove the existing drywall and add the second wall with the new studs interleaving but not touching as shown in the book. But behind the existing drywall and over the studs is a layer of shiplap - horizontal boards completely covering the studs.

Common sense tells me these have to come off, too, but I thought I'd check to see if anyone has a better idea - anyone been through this?

 

[chugheshc]

I am pretty sure shiplap is overlapping horizontal boards.
Like you see on old wooden siding or... ships.
A lot of older houses had horizontal sheathing (or even diagonal), but
shiplap is usually the outside (weather facing) surface - the over lapping boards provide a drip edge to wick water away from the interior of the wall.
sorry to butt in.
Cheers
C>

 

[dintymoore]

The roof of my house is shiplap. It's simply wooden planks (mine are like 1"x8"x10') that have a tongue cut on each side so that they overlap and there's no cracks between them.

I would leave the shiplap. It's probably nice old wood. The more density in the walls the better is my thinking.