Carbon12 - CLT | xx' | 8 floors | Complete

[eric cantona]

Originally Posted by maccoinnich

that is sofa king sweet. I want to live in a CLT building.

[Leo]

Originally Posted by eric cantona

that is sofa king sweet. I want to live in a CLT building.

Looks sweet! Although having owned a condo with wood ceilings and wood floor, it was like living in a giant guitar. You didn't get the echo factor you sometimes get with concrete ceilings; everything was just super-loud!

[eric cantona]

Originally Posted by Leo

Looks sweet! Although having owned a condo with wood ceilings and wood floor, it was like living in a giant guitar. You didn't get the echo factor you sometimes get with concrete ceilings; everything was just super-loud!

I agree. the framework bldg (the smaller one) in NE has serious issues w/ sound from upper floors transmitting down to floors directly below. I am working on a similar project that will have a 3" (I think) conc. topping slab over the CLT panels. we'll see if that works...

[maccoinnich]

I can't remember the exact buildup, but Carbon12 will have denglass sheathing, gypcrete, etc over the CLT panels, all of which is for acoustic purposes.

[AdamUrbanist]

I believe this is the first residential CLT building to go up. Residential has different requirements for sound control. STC and IIC ratings of 50 or better which is no small feat in a wood building - particularly where there is no gyp ceiling. High end condo buyers are not inclined to suffer their neighbor's midnight drum solos so they may even go well above this threshold. I imagine they will need a thick topping of concrete or gypcrete poured over a thick isolation matte. I'll be watching to see how future CLT buildings tackle this issue.

[urbanlife]

It is looking really good, I wish I had the time to even just get up there to see the construction process....but with a baby on the way in March, I just don't have any time to do anything else. I really hope this is the beginning of a new trend in Portland, it would be awesome to see CLT buildings popping up everywhere.

[MarkDaMan]

Originally Posted by urbanlife

It is looking really good, I wish I had the time to even just get up there to see the construction process....but with a baby on the way in March, I just don't have any time to do anything else.

Congrats buddy! You've grown up on this forum, glad to hear the good news!!

[bvpcvm]

Originally Posted by MarkDaMan

Congrats buddy! You've grown up on this forum, glad to hear the good news!!

Haha, I had the same thought, but before I could post anything I was distracted by my own kid's pokemon monologue. Congrats, Urbanlife!

[tworivers]

Congrats urbanlife and welcome to the, uh, club.

[urbanlife]

Thanks guys, I am excited for it....plus it is quite a reminder of how long we have all been posting on this site. But I will say, over all these years, I still love this town and happy I have picked this area to really put down some roots.

[maccoinnich]

Kate Brown was at Carbon12 today.

[maccoinnich]

Wood: the sky’s the limit



“You’re standing on the tallest wood building in the United States,” said Ben Kaiser on top of his Carbon12 at North Williams Avenue and Northeast Fremont Street.

For the moment, he’s right. It’s also the first residential use of timber framing at its height in the U.S.

At 95 feet and eight stories, Carbon12 is a shade taller than architect Michael Green’s seven-story T3; the Minneapolis structure held the distinction for only a few months.

T3 and Carbon12 both employ mass timber in their structural systems – T3 with nail- and glue-laminated timber and Carbon12 with a hybrid of cross-laminated timber (CLT) and a steel core. Both were asked to compete in the USDA’s Tall Wood Buildings contest, though neither won. A different Portland wood skyscraper, the Framework tower, ended up splitting the $3 million prize with a now-scrapped New York City project.

The design competition, backed by the Obama administration, evidently helped invigorate the race to erect so-called wood skyscrapers in the U.S., a contest Portland is well-positioned to dominate.

Building codes in the U.S. for more than a century have discouraged use of wood framing in structures taller than five stories because of life safety concerns. CLT, however, especially in concert with other forms of mass timber, have the potential to change this. They’ve already been in use elsewhere – notably Europe and Canada – since the 1990s.

...continues at the DJC (temporarily unlocked).

[Nunya]

Loving the CLT and can't wait to see a few more of these.

Though... still not the tallest wooden building or close to it yet. Not sure what the tallest would be but just off the top of my head the Tacoma Dome and the Tillamook Hangar are both about twice this tall.

[urbanlife]

That looks so tall for that area, it would be awesome to see more of this throughout Portland, and even cooler to get new little urban districts of CLT buildings.

[zilfondel]

Originally Posted by eric cantona

I am working on a similar project that will have a 3" (I think) conc. topping slab over the CLT panels. we'll see if that works...

Clay Creative has a concrete slab over the top of 2x4's laid edgewise side by side, so essentially a CLT. If you go into the lobby you can see what its like.

I would probably look at making the concrete a floating floor over rigid foam insulation (if the engineers allow it), to minimize sound transmission.

You may want to do some research into what they do in Europe to attenuate sound in residential buildings. I seem to recall seeing diagrams of insulation under the floor in many residential buildings, as they build the floor up instead of furring the ceiling. Since sound is transmitted (through footsteps) through the floor into the structure, having an acoustically dampened floor should help limit the sound propagation.

Even those foam underlayments that go under a floating composite floor should help, although there are specific products soundproofing.


Floor construction for typ wood floors, from Living Spaces: Ecological Building and Design


image from http://www.cellecta.co.uk on a CLT application in a school


They take soundproofing in Europe pretty seriously.

[MarkDaMan]

Oregon pushes for wooden skyscrapers to revive timber industry
By The Oregonian/OregonLive
By Elliot Njus and Molly Harbarger
on April 30, 2017 at 7:00 AM, updated April 30, 2017 at 7:01 AM

http://www.oregonlive.com/business/i..._wood_sky.html

It's rare that a governor shows up to celebrate a new condo tower.

But this one's made of wood, and that's a bigger deal than it seems.

Gov. Kate Brown was on hand the day Carbon12 in North Portland reached its full eight stories and became the nation's tallest wood building. The feat was made possible by cross-laminated timber, wood engineered to have the strength of steel.

The distinction won't last long. Another Portland development, an 11–story high-rise made of the same wood product, is expected to secure a building permit within weeks and start construction this summer.

For Oregon, cross-laminated timber represents a chance to revive the moribund wood products industry, restoring logging and manufacturing jobs in rural communities — where the state's natural resources give it a clear advantage over foreign competitors.

The state is investing hundreds of thousands of taxpayer dollars to promote CLT. Right now, only a handful of buildings in the U.S. have been built with it, and most are in Oregon.

But even as CLT presents an opportunity for the state, the nation's building codes are slow to endorse new materials, and industries that could lose sales to CLT aren't giving up market share without a fight.

***(continues)

[cityscapes]

[tworivers]

The 8-story condo at Williams and Fremont was looking pretty good in the sunset a few days ago...



edit: just reminded myself that technically this one is in NE...oh well, close enough!

[maccoinnich]

Condos For Sale on North Portland’s Williams Avenue Carry an Asking Price of $1.5 Million

Carbon12, the condo project that set a new record for tallest all-timber building, may set a new high in the real-estate market.



An eight-story condominium building at the corner of North Williams Avenue and North Fremont Street has already set a record as the nation's tallest all-timber structure.

Now the building may set another record: The most expensive condos for sale in a complex on the east side of the Willamette River.

The asking price for two of the 14 condos in the Carbon12 building is close to $1.5 million—a hefty sum for any eastside neighborhood, but especially in the North Williams area, where gentrification and displacement is a raw issue.

...continues at the Willamette Week.

[Leo]

Wow, that is pricey ... For reference, a 1700sf unit on the 21st floor (top floor) of the Vista was priced just a bit below $1.5 million. And that is for an established builder, in an established neighborhood.

Remind me again what the advantages of this innovative technology were supposed to be? Cost is definitely not one of them, at least not the type of cost the end user cares about. No discount factor for taking the risk of a transitional neighborhood or beta-testing an innovative construction technology, apparently...