Tongue and Groove versus Shiplap? - Woodworking Talk - Woodworkers Forum
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post #1 of 15 Old 11-03-2018, 08:15 PM Thread Starter
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Tongue and Groove versus Shiplap?

I was just reading a forum thread and tongue-n-groove was mention, and that sparked this post. I know the difference, physically, but when do you use one or the other?? It seems to me that shiplap is a lot easier to make, and once installed on a wall, can you tell the difference??
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post #2 of 15 Old 11-04-2018, 05:12 PM
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t&g is typically angle nailed through the tongue only, shiplap is face nailed
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post #3 of 15 Old 11-04-2018, 05:33 PM
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Seems to depend on what you call shiplap, to me both of these are actually tongue and groove:

https://www.duffieldtimber.com/blog/...ofile-is-best/

I have always considered shiplap to be a half lap joint along the edge of the boards.
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post #4 of 15 Old 11-04-2018, 06:49 PM Thread Starter
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Quote:
Originally Posted by _Ogre View Post
t&g is typically angle nailed through the tongue only, shiplap is face nailed
That makes sense: fastener concealment.


Quote:
Originally Posted by FrankC View Post
Seems to depend on what you call shiplap, to me both of these are actually tongue and groove:

https://www.duffieldtimber.com/blog/...ofile-is-best/

I have always considered shiplap to be a half lap joint along the edge of the boards.
I agree on both counts. Both images look like tongue and groove to me, and all shiplap boards I've ever seen are half laps along the edge.
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post #5 of 15 Old 11-04-2018, 08:07 PM
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Some of the old siding I have seen (and called shiplap) had a somewhat contoured lower lip that was quite long, and covered a tapered edge of the piece below it. It had a rabbit on the back side that rested on the piece below it. In some cases the back of the siding did not rest tight against the sheathing, but left a tapered void from the top of the previous piece tapering down to it's own top edge.

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post #6 of 15 Old 11-04-2018, 08:14 PM
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Here's a shot of a still different style. This is on a small portion of our house, built circa 1890, originally log cabin style, but no Idea when the siding was installed. Most of it has been covered (unfortunately) with a crappy modern vinyl siding.
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post #7 of 15 Old 11-04-2018, 09:34 PM
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Just thoughts from an old methane gas cloud.

I always thought that T&G was for floors and vertical on a wall. Much of my grandmother's home (Built ca. 1913.) in Brooklyn had a lot of it in very dark stain. While ship lap was intended for exterior siding.

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post #8 of 15 Old 11-05-2018, 05:56 AM
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You and I must have a totally different picture of what ship lap looks like. In looks it is nothing like tongue and grove. Ship lap is something that I would use on the outside of a house(that is normal use) and not on an inside wall. As mentioned above, when tongue and grove is used on a wall, the boards are usually vertical.



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post #9 of 15 Old 11-05-2018, 06:13 AM
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To address the why one over the other.

In this instance t+g was the right choice for the fence panels, ship lap would not keep the boards in the panels properly connected.

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post #10 of 15 Old 11-05-2018, 08:54 AM
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I put up ship lap (interior). I primed and painted the boards before installing and did a second coat after installing. I recommend it.
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post #11 of 15 Old 11-05-2018, 11:50 AM
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It seems that shiplap once a noun has now become an adjective by designers to describe a certain look.

Wise men speak because they have something to say; fools because they have to say something -Plato

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post #12 of 15 Old 11-05-2018, 04:01 PM
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I saw an article where the writer ripped 1/2" thick birch plywood and painted the face and edges and nailed it up on the wall over the same color painted wall. It made a very effective immitation of a shiplapped wall at a lower cost.

He said he considered 1/4" thick, but that would have required construction adhesive and the 1/2" thick only required nails. I might try it. With a 1/8" or 3/16" gap the edges would not show on the planks. I might Spackle the edges anyway.
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post #13 of 15 Old 11-05-2018, 04:39 PM
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i used shiplap 1x6 white pine flooring in the first house i built, on the 2nd floor, good side down for the finished ceiling
mine was v-grooved on the down side only, it made for a nice ceiling




here are all the typical siding types


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post #14 of 15 Old 11-05-2018, 04:45 PM
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you can buy this type 1/2"x3" t&g paneling at most any home building store

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post #15 of 15 Old 11-06-2018, 09:53 AM
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Quote:
Originally Posted by FrankC View Post
Seems to depend on what you call shiplap, to me both of these are actually tongue and groove:

https://www.duffieldtimber.com/blog/...ofile-is-best/

I have always considered shiplap to be a half lap joint along the edge of the boards.

The reason that these are similar is because what they are calling shiplap is actually a hybrid of the two.


Two Rails: Shiplap is intended for horizontal boards, with each board having an overlapping edge onto the board below it. The primary purpose is to shed water.


Tongue and groove is a joint designed to be inserted, one edge into the other, for the purpose of keeping boards aligned with each other. Shiplap does not accomplish that.
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