Recent Q&A

• Small amount of condensation OK or harmful?

  I'm just moving into my new construction house and am noticing that there's a small amount of condensation on the bottom of the windows during cold nights. I do have…

• Rigid insulation thickness formula for unvented roof the same as walls?

  Do roofs follow the same formula as walls for rigid insulation thickness? As an example, if I'm in a zone 5 climate, 27% of the R-value is required for rigid…

• 压条金属壁板吗?

  Hello All,Is it recommended to install metal siding with battens so there's an air gap? Most metal siding is ribbed, which kind of creates its own air channels, so I'm…

• ERV vs. HRV: humidity reduction

  Hello All, Can anyone reference any case studies that have been done that compare the performance of an HRV to an ERV in the same home? Specifically, I'm looking for data…

• Exterior Wall Light Electrical Box

  For outdoor coach lights, are special exterior rated electrical boxes needed? Or are standard interior rated electrical boxes generally used since the light fixture has a gasket that will seal…

• Porch ledger and exterior insulation

  In the next few weeks I'll be installing 2'' of exterior insulation along with a rain-screen made out of 2x4s. I have a shed porch roof that will come off…

• ICF + 2×4 superinsulated walls

  Has anyone built an ICF home with 2x4 walls on the interior of the ICF forms for added insulation? This seems like a relatively easy way to get a super-insulated…

• Receptacle connection with foam sheathing

  I'm going to have 2'' of rigid insulation on the exterior of my home and am trying to figure out the best way to install receptacles. It seems that one…

• Electric question

  I'm building my own house and will be doing the wiring. My roof rafters will be 4x8 timbers and be exposed (like a log home), so there will be no…

• Flexible plumbing pipe

  I'm plumbing the interior of my house with PEX and my exterior line will also be a 1'' PEX line. I have a pipe sleeve running through the bottom of…