What are some alternatives to stop the thermal bridging around the windows and doors?

Question

What are some alternatives to stop the thermal bridging around the windows and doors?

Asked by Doug Keaty

I am applying 2" of foam over my osb. Do I need to build 2X2 wood frames for my windows to be anchored to?

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Answers

Edward Wright's picture

Doug,

Yes - your windows need to be secured to solid wood. The loss of R-value at that blocking is minor - when averaged with the improvements you are making to whole wall assembly.

Diverting water and resisting air infiltration will make a durable and energy saving assembly.

  • It is important with both windows and doors to install flashing at the head, jambs and sills, as well as
  • air sealing around the exterior perimeter and spraying minimal-expanding foam around the gap between the rough opening and the window/door.

A leaky (water + air) installation will cost much more long-term than would be saved by the additional insulation.

Good luck with your project,

Edward