Skip to main content
19 votes
Accepted

Should electrical box face plates be caulked?

Definitely don't caulk. Get appropriate (i.e., UL or ETL listed, fire retardant, etc.) foam designed for this purpose, such as this Frost King kit from Home Depot:
manassehkatz-Moving 2 Codidact's user avatar
4 votes
Accepted

Can R values be averaged?

No, R values can't be averaged to find an assembly's effective R value. R value is a local material property, thickness divided by thermal conductivity, and the physics don't allow for simple ...
popham's user avatar
  • 10.4k
3 votes

How are insulation R-values calculated for wall cavities of inconsistent thickness?

The Building Code (Energy Code) stipulates the R - values allowed for various building components. (See ICC Chapter 11) Likewise the Energy Code stipulates the maximum amount of windows, doors, ...
Lee Sam's user avatar
  • 23.3k
2 votes

Can R values be averaged?

Consider a flat panel shape, thickness E, area S. For example, a wall. For the purposes of this calculation we consider thickness to be small compared to the two other dimensions so edge effects are ...
bobflux's user avatar
  • 9,863
1 vote

Garage insulation really need R-39?

Home depot is telling you recommendations for conditioned space. Assuming you are not familiar with finding/interpreting building codes: You will need to call your local building department and ask ...
The Ghost of Jon's user avatar
1 vote

Where can I find the U-factor (U-value) for a Pella window?

As with most items, there are good, better and best. With Pelli, you can break that down into another hundred parts or so. Background: In the construction industry, most items (locks, carpet, ...
Lee Sam's user avatar
  • 23.3k

Only top scored, non community-wiki answers of a minimum length are eligible