30 Aug '12, 5pm

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

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.

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