The red-looking Karamatsu laminated timber beams are clearly visible. The rest of the spruce white meat is hidden. Therefore, it is always difficult to check the hidden drawings. On a different note...Hokkaido, where beautiful cedar trees don't grow anywhere other than the southern part. Instead, laminated pine wood and artificial drying techniques were developed. Thanks to this, the minimum strength of the beam is E-105 or higher. High-strength materials have a Young's modulus of E-150 or higher. In this way, the roof is strong enough to hold snow for half a year without having to become the main breadwinner.
Yesterday was the instruction manual and handover of the 42-year-old "Hasamu no Ie III" which was renovated to improve its performance. As usual, I will have the flowers tailored, and I will deliver everything to the customer, including various copies, as-built drawings, all files on my PC, and CAD data. In accordance with the rules of the government's long-term quality housing renovation promotion project, this house has been renovated to look like a new building, so I'm sure this house will outlive me. I've been doing this for the past 10 years in order to leave as much of a clue as possible to the designers of the future.
As a side note, just because it is a highly insulated and airtight house, we do not ask our customers for a thick living manual or special living arrangements. In the past, I used to give long and careless instruction manuals like that/LOL...Customers only live according to the instructions for the first few years...After I realized that, I started to improve the tolerance of the home owners. We have changed the way they are made and designed so that even if you raise them up and live in a somewhat naughty way, it will not cause any serious problems.
``The important thing is to turn on the 3-type ventilation switch from April to November, and turn it off during other seasons!'' Since 2009, since we built a house with 300mm insulation, we can maintain the design room temperature above 18℃ with a total of 6 to 8 hours of heating operation per day, so we set a timer for the operating time at the time of handover. Customers just need to try living there and make minor adjustments! It's like that. Other than that... please feel free to open your windows all year round. Bathrooms and dressing rooms are the warmest areas in winter, so mold won't grow even if you turn on the ventilation fan or not. In winter, you'll be surprised at how quickly your laundry dries/lol. If you want to use a humidifier, first open the lid of the bathtub. You can easily humidify. Open stoves are strictly prohibited as it is highly airtight! But a cassette stove is OK/lol...I'm going to continue building insulated houses that are easy and comfortable to live in. If it's difficult, it won't last long/lol...
Finally, I would like to express my sincere gratitude to the owner of the building for giving me this valuable opportunity to take on this challenge. Please enjoy your home freely.
今の気分はブルースカイですね！チーム発寒の家Ⅲのみんな、ごくろうさま/笑
I'm feeling blue sky right now! Everyone from Team Hassamu Ie III, Gokuro-sama/lol
Today we will be measuring the airtightness of Kaguraoka no Ie II, which is currently under construction in Asahikawa. Before measurement, we check the penetrations of the exterior wall separately, and use a blower to suck out the indoor air (decompression method) to check for air leaks.
外部の貫通部分はガスケットとテープでしっかり気密を行います。
The external penetration part is tightly sealed with gasket and tape.
室内からもブチルテープを用いて丁寧に気密化します。
We will carefully make the room airtight using butyl tape.
The parts that penetrate the exterior wall are not just pipes. The battledore bolts are also carefully made airtight one by one using butyl tape. This is the careful work of master carpenter Kanno. I remember being impressed when I saw similar work done eight years ago when I had my first ``Toko House'' constructed.
結構な数の羽子板ボルトがありますから中々たいへんな仕事です。
There are quite a number of battledore bolts, so it's quite a difficult job.
This is around the airtight outlet box. The key point is that the joint between the moisture-proof sheet and the outlet box is filled with urethane. This will greatly reduce air leakage from around switches and outlets on the outside wall. If this treatment is not done properly, you may feel cold air coming from around the electrical outlet, especially in the winter.
The airtightness of the measurements was so high that errors (the machine could not detect air leaks) occurred frequently, and it took many measurements to finally be able to measure the airtightness.
計測器はコーナー札幌製。
The measuring instrument is made by Corner Sapporo.
１階の西側の窓で計測しました。
Measurements were taken from the west window on the first floor.
測定結果はC値：0.2ｃｍ2/㎡と最高の結果となりました。
The measurement result was the highest C value: 0.2cm2/㎡.
Live streaming forum on Thursday, October 12th. It was a lot of fun (lol) Insulation will become compulsory from 2025, and I was surprised to find so many supporters of insulation all over the country, as I only know about Hokkaido.
Daimaou Kosaka was a very good host and brought out the unique characteristics of all the guests, including myself, and I felt that his stories were amazing without being too maniacal.
What surprised me was the number of staff and the equipment. Personally, I thought there would be only a few people filming, but I was surprised at how serious the work behind the scenes was.
Today we measured the airtightness of the performance improvement renovation "Hatsu no Ie III". From the results, the C value is 0.2㎠/㎡. Of course, a lot of credit goes to the skilled carpenters at Hiei Construction, but this was also the first time we were able to use different insulation materials for each wall. The reason for this is simple: on the north and west sides, where the distance between neighboring properties is severe, urethane (A1H), which has high performance per thickness, is sprayed into the walls to minimize the additional insulation thickness and meet the specified performance, and on the remaining walls, Because it was filled with regular 105mm insulation material + 120mm additional insulation. This was a valuable experience because in normal new construction, the insulation specifications for each direction do not change. But this urethane spraying. I definitely felt that it was airtight. This is the number from the first measurement...It seems that it will be useful in future performance improvement renovations. I am truly grateful to all of you.
The left side is the south wall filled with 105mm GW, and the right side is urethane sprayed. Since the urethane skin layer will be removed, a moisture-proof sheet will be installed on both sides just in case.
こちらがウレタンを吹きつけた北側の壁面
This is the north wall sprayed with urethane.
計測器はドルフィンⅡに超高気密案件用の小型整流筒の組み合わせ
The measuring instrument is a combination of Dolphin II and a small rectifier tube for ultra-high airtight projects.
