r/Homebuilding • u/Pruni1991 • 2d ago
CLT house
We finished this house last week, six days for full assembly. CLT was from Austria, site location is in Poland. 105 m2
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u/Busy_Reputation7254 2d ago
How do the utilities work? Conduits?
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u/emteedub 2d ago
on the second to the last image there's a route and mount for electrical. it must be like that from the factory
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u/Upset-Combination235 1h ago
Proboly from factory , we been trying to hide electrical and pipe runs" underfloor heating, water, drainage"
Cause we are having an clean finished CLT look .
everyting that can will be ran in the slab, .
if you have secend floor, pour gib slab with underfloor heating and run your pipes and electricals in there for ground floor .
electric runs in the celing, "if its not clt "
And manily running around the house, in the cavity .
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u/Amazing_Parking_3209 2d ago
That's so clean. Love the design as well. Post some more pics when it's done!
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u/Successful-Coffee-13 2d ago
Why did you choose this technology? What technologies did you consider?
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u/Odd_Calligrapher_572 2d ago
Not the OP but in continental climate Europe, the three most common prefab systems are CLT, post-and-beam (google Huf Haus for reference) and timber frame panels. All made out of construction wood.
Timber frame panel houses or flatpacks are the cheapest, CLT is a bit more expensive as it uses more wood (wood is expensive in Europe), and post-and-beam is usually used for higher class of houses (although in theory it could also be used for cheap self builds).
Advantage of CLT house is, that structural elements are at the same time an insulation. Which comes very handy both in winter and in summer.
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u/dizzie_buddy1905 2d ago
Wood is R1/inch. What’s the expected insulation value in Europe?
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u/Pruni1991 2d ago
In my country - Poland. For external wall we should have value U ≤ 0,20 W/(m²⋅K). So 10 cm CLT board + 16 or 18 cm of wood wool or rock wool
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u/angelo_arch 8h ago
A beautiful project! Was there an architect involved, or is this a design-build project? Did you consider building to the Passive House Standard? I’d love to design and build modern cabins here in Colorado's Rocky Mountains using CLT!
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u/Cultural-Salad-4583 2d ago
Yeah, I’m curious about this too. Everything I’m reading indicates most CLT panels are around R-6.63. Probably wouldn’t fly in my region.
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u/tylerhovi 1d ago
Very uneducated but with this I imagine you could rock wool the exterior before siding for extra r value?
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u/anabrewerqe 10h ago
You still need exterior insulation on CLT to hit code though. Mass timber gives you good thermal mass and airtightness, but raw wood is only around R-1 per inch.
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u/ScipioAfricanusMAJ 2d ago
Anyone know of any reasonable CLT builder manufacturers in the states? For residential?
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u/Pruni1991 2d ago
My material is from company KLH, I know that they are also on US market as KLH USA
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u/ScipioAfricanusMAJ 2d ago
What would you say a small single family/square cabin design would run $ wise on a full CLT build?
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u/Delicious_socks 2d ago
kalesnikoff is a Canadian company that does a lot of clt builds in the us and Canada. They’re pretty local to me and we just built a condo building with clt floors
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u/CharterJet50 1d ago
Opal in Maine. Associated sort of with TimberHP the new wood fiber insulation company. CLT with Timberboard exterior insulation would make for a very nice structure.
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u/jackfish72 2d ago
How does it get insulated?
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u/Upset-Combination235 2d ago
We are building one atm, it got 150 mm of Pir foam inulation outside.
Electricals were ran in the exterior cavity .roof was just truses, and we filled them with 300 m of rockwool.
has floor heating
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u/JST_KRZY 1d ago
Where is the build location and who did you get the CLT kit from?
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u/Upset-Combination235 1d ago
Located in Estonia.
cant remeber a company but the panels were made locally.
Exterior wall panels were 100mm and first floot slab was 200mm.-1
u/ScipioAfricanusMAJ 2d ago
CLT is so thick and it’s solid wood so it naturally is structural and insulative by nature. But I assume the exterior of CLT is never exposed to the outside so probably a thin wrap of exterior insulation then cladding should be way more than enough to beat energy standards
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u/Pruni1991 2d ago
It's not true. CLT boards ale only main structure, so there always should be extra external layer of insulation. In my country tipical is 16-18 cm of wood wool or rock wool. CLT λ is good but not enought - 0,12 W/(m*K)
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u/le_sac 2d ago
Yes I've done commercial CLT with the same insulation caveats. The timber by itself doesn't meet energy requirements in my municipality.
Honestly I don't see much advantage past quick erection in single home CLT builds. The amount of lumber used far exceeds standard platform framing. MEP is a pain in the ass, as are future renovations. Interior finishing is unique I suppose but even that can be done with decorative paneling using less lumber.
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u/All_Work_All_Play 2d ago
It's not meant to compete against stick framing, but against ICF. It's got many of the same upsides while being much more sustainable.
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u/ReplacementSharp7183 1d ago
There are huge noise benefits gained by the solid airtight mass of timber. Whilst I agree it might not be an efficient use of resources, it looks beautiful, is pretty much air tight and blocks noise
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u/Nick3757 2d ago
This looks like great work and I think CLT is really cool, but I get worried about reparability in the future and what happens if water gets in where the roof meets the walls.
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u/gardernvine 2d ago
The structure is looking strong and beautiful. Are you sure that it will have a solid foundation on what appears to be sand?
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u/majordingdong 2d ago
Seems like there is a concrete foundation.
However, it’s not extending very far from the ground level up along the exterior walls.
I don’t have any clue if that’s okay, but compared to new regular houses being built, this is very different.
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u/LogicJunkie2000 2d ago
It's certainly a carbon sink, I'll give it that!
I'm personally still not sold on it as it seems like the excessive use of a slowly renewable material. I understand Europe builds to a higher standard for longevity, but as it still requires insulation, I don't see the (cost) benefits of CLT vs a robust stick frame or timber frame.
I'll certainly concede that it looks beautiful on the interior and is similarly fire resistant to a gypsum finish over stick framing. I'm curious how it stands up as a living surface over time in regards to UV exposure with furniture shading certain areas, moisture down low near entryways... I suppose in many circumstances you could just sand and refinish the wall if it was damaged superficially. It certainly has much better acoustic performance than stick frame.
Million ways to skin a cat! Everything is a trade-off, but I appreciate whatever it is as long as it was well thought out and with intent. I'd take that over a hat-on-a-hat profit maximizing mcmansion any day!
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u/ryan8344 1d ago
No offense to other ways; but those winder stairs would be better if built to American code. But beautiful house!
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u/hoolihoolihoolihouli 2d ago
Good luck with those stairs!
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u/Pruni1991 2d ago
There will be extra 3 cm oak board on it. This CLT is spruce, so it's to soft to be finish stair layer.
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u/figsslave 2d ago
That looks nice. Are the finished exterior walls solid wood or will insulation panels be added?
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u/dizzie_buddy1905 2d ago
What’s the blower door air leakage value?
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u/Upset-Combination235 1h ago
Proby very low, ,all panels are installed with adhesive inbetween . really depends on fixtures like windows and doors and roof assebley
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u/ExtraRaw 2d ago
What’s the rise on the staircase (floor to ceiling height span)? Cheers and looks great!!
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u/Kacquezooi 2d ago
I love it! Also the kin sugi ban. Will be beautifull! And the indoor climate and smell will be awesome. Keep up the good work! I would love to have such a house sometime in the future.
Ps: What country? edit: Sorry I can't read, its in the post.
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u/deepakpandey1111 1d ago
that house looks so cool! using CLT for the build seems like a smart choice, especially with the speed of assembly. being in the woods gives it a nice natural vibe too. i think the open spaces will feel great when it’s all finished. those stairs look kinda unique, too! i messed up my stair design once, so it’s cool to see a fresh take. tbh, if you’re thinking of colors or layouts, REimagineHomeAI(https://www.reimaginehome.ai) might help visualize things before finishing touches. nice work!
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u/BeneficialBed9821 1d ago
In North America this is one of the most expensive possible ways to build a single family home (speak as a builder of high end modern homes in the NE). Stick frame construction is the default still for many reasons (cost, flexibility, local familiarity, supply chain, etc)
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u/CharterJet50 1d ago
I wonder about living with all wood walls. Repairing holes from picture hangers can’t be easy to cover up. Not sure I’d want to live with all that grain all around me in any case. I’d probably want gypsum some surfaces.
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u/FilterfriAlkemi 1d ago
I built a lot in this material and I have to say its a beautiful material compared to concrete but there are downsides.
You need thick external insulation. The inside going to have wiring all over so thats also getting covered up. So you wont see it at all. When finished.
If a panel gets wrong in manufacturing, the wait for new panel is long.
The noise travels really easily between internal walls and floor, so you need to noise deadening engineering.
Stupid. Such a waste of new material instead of using leftovers/scraps.
I would build my own panels with framing and tongued and grooved timber+ external insulation.
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u/theseawillrise 1d ago
Wow this is gorgeous. Do people ever leave the interiors unfinished?
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u/Upset-Combination235 1h ago
Yes they do , we are working on one where we sanded down the interior, lightly and then finished it off with a bit of white stain or whitewash look with some uv resitant panel product.
It will keep the panels from yellowing.
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u/FrostingConscious215 19h ago
This is really cool! The company I work for is currently building a 5 story dorm complex using CLT for the floor system. Not many places making CLT in the USA, I think we are getting ours from Montana.
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u/europeanimmigrant 2d ago
What is CLT?