Recent Q&A

• Putting batt insulation between 2×4 top chord truss for unvented low slope roof

  Hello,It's been awhile since I've asked a question here but I need some of this community's expertise yet again. I am connecting an a two story addition to an existing home. …

• Closed cell spray foam over moist brick and mudsill

  Hello,A duplex I recently purchased has a moist crawlspace including moist brick and water-stained mudsill (see pictures). I believe most of the problem comes from missing or poorly placed downspouts. …

• 关闭细胞喷雾泡沫在旧μdsill

  Hello,I have a 1920s duplex that has a large old growth mudsill. The inspection report said that a few parts of the mudsill had some moisture damage. The reason for…

• HFOs vs. HFCs in spray foam

  I am finally ready to insulate my basement with closed cell spray foam. I have the choice between Icynene, Demilec Heatlok HT HFO, or Lapolla Foam Lok 2000-4G. The latter…

• Turning off/setting back ductless minisplits, kwh, efficiency, and more

  So I talked to an LG engineer today (hint: if you have questions about minisplit performance, don't call tech support, find the number to a local manufacturer and ask to…

• Phantom Load – Ductless Minisplit

  Hello, I have an LG ductless minisplit system. The condenser is an LG LMU480HV. There are 8 indoor units (6 wall units, 2 ceiling mounts) connected to the condenser. The…

• Overcharged minisplit condenser leads to higher electricity bills

  I believe I have solved my problem of why my ductless minisplit system was performing so poorly. My condenser was overcharged with refrigerant by 3 lbs. I have attached a…

• Passivhaus total energy usage standard

  One of the Passivhaus standards is that total energy usage including appliances cannot exceed 11.1 kwh per sq. ft. per year. If I have a 2800 square foot house, then…

• Still Grinding – Uninsulated basement and minisplit problems

  It's been about 1 year and 10 months since I started building my house and I'm still grinding. Doing the board and batten siding mixed with cedar is taking some…

• Dense-packed cellulose might go extinct

  I apologize for the clickbait title, but it seems all of the insulation contractors in my area are very wary of dense-packed cellulose in walls and often say, "we normally…