Quercus alba-riffic!

Things I learned today: Betty White is the oldest person to have guest-hosted Saturday Night Live, Whitey Bulger is guilty (no, really?) and, as a species, white oak quercus alba  is crazy tough!

A little intro: This house in Sagamore, Mass is owned by some very nice and interesting folks who sincerely want to do the right thing in a proper historic restoration. The early part of the frame is from roughly 1725 (we found some sapwood recently which may allow us to do some dendro on at least part of the house). The addition (left) was put on not long after the first was stood. There are stories about carrying pieces across the frozen tundra of Cape Cod Bay but it’s hard to pin these down.

DSC04220

Michael, John, Andrew, Keith and I have all worked on the house at one time or another. Before the gorgeous new windows and clapboards can be applied (historically researched and hand-crafted), portions of the frame are often found in need of repair. Our latest ground-zero on the Sagamore house is a post in the addition which needs a scarfed infusion of new oak to replace its naughty bits…

DSC04470

Below is a closer look. It’s likely the addition (attached sometime after 1725) was repaired with a scarf joint of its own at either the same time of the addition or sometime not long thereafter.

DSC04478

John and I jacked up the frame to carry some of the load while we went about our work.

DSC04434

We cut away the structural dust, and examined the remainder–

DSC04439

Some cool things revealed themselves once the dust settled:

This half of a mortise showed a bunch of stop cuts in gnarly grain. Clearly, the carpenter was an ANGRY elf…!

DSC04445

Once we excised out the rotted parts of the post, we saw two fine and ordered girt tenons which met at a right angle in the post’s center:

DSC04477

Good day sir. Good day to YOU sir.

The long grain on the left girt tenon looked as though it were cut 2 weeks ago, while the end grain of the tenon’s shoulders (as well as the inside of the pin-hole) was a little the worse for wear. The end grain of the left tenon was in good shape, but that on the right hand tenon was more generally, meh. There are seemingly endless variables in the ways that oak can decay, but it all just seems so flippin random sometimes. Check out that sweet little chamfer on the tenon end! It’s a far hew and cry from the harried chopping at the bottom of the mortise.

DSC04475

Fine day for a circumlocution around the thesaurus, don’t you think? Indubitably, sir.

And look what came out of the joint after we pulled it apart.

Pulling…

DSC04461

Puuuulling…Look! Look what 288 years, give or take, hath wrought on this pin!

DSC04459

Yeah, but can it open a bottle of Moxie?

That’s one bad-ass draw bore! (Intentional mis-alignment of holes in tenon and mortise when joining green wood in order to allow a tapered pin to pull the joint tighter).  Below, the tenon’s “drawing” into the mortice holds fast, even after the pin is removed. You can see how aggressively  the tapered pin pulled the green oak together as it was driven in.

DSC04465

Ergo, he says in his best professorial tenor, this salvaged little octagon of riven quercus tells us a few things:

  • Draw bores really work and a little 1 inch white oak pin (definitely white oak– I could smell it as I sawed through) can take an amazing amount of stress for centuries and keep on ticking.
  • And see how the pin above has a radius cut out of it on its end? The pins on the front wall post and girt were driven in first, meaning the front wall was assembled and lifted into place before the end wall. After the trenail was driven in, the end wall  girt tenon was put in its mortise and a hole bored through both its tenon and the tip of the trenail coming in from the front wall girt tenon. Like butter. A frame’s raising sequence can be gleaned from a single geriatric, though tough, pin.
  • I need to get another hobby.

blue acornblue acornblue acorn

Advertisements
Tagged ,

10 thoughts on “Quercus alba-riffic!

  1. Linda Master says:

    This is so interesting!

  2. mpdyer says:

    That tenon on the right looks like white pine to me, hence the tear-out on the chamfer.

    • Rick says:

      It does, doesn’t it? Great observation. I’ll confirm that this morning and amend the post. It didn’t even occur to me! Thanks for pointing that out.

      Rick

  3. Marie Pelletier says:

    fabulous–great stuff and your life as an interpreter continues–

  4. Gerald Vinci says:

    I love hearing from people who find all of this as interesting as I find it. I’d love to se this first hand. Not that far away.

    • Rick says:

      When we’re working on an old house, I just can’t help but wonder about the historic context: What trees were available, was the carpenter having a bad day when he cut that joint, etc. Lots of stories there. Thanks for saying, Gerald.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: