Calzone
Gear Whore #1
- Local time
- 10:29 AM
- Joined
- Nov 11, 2008
- Messages
- 16,816
- Location
- The Gateway To The Hudson Highlands
Bathroom demo begins today.
I’m kinda excited.
Seems like to avoid “thermal-bridging” through the rafters the best way to utilize my rigid foam that has double sided radiant-barriers is to install them right on the rafters. Know that the air gap created between the roof sheathing (tongue and groove) from the rafters will be just a dead air space.
R-51 on the floor of the attic means 8 inches of rock wool will run perpendicular to the 6 inches of rock wool that fills the joists.
According to the government the wood that comprise the joists and rafters are pretty good heat conductors, and about 25% of your energy costs are lost through this thermal bridging. Know that old homes lack the radiant barriers and insulation that normally by building code is applied to the exterior of the walls, or on top of the roof sheathing where it is easy to make the insulation continuous.
My goal is to make my attic not get like an oven, and pretty much with a continuous radiant barrier my attic should not get hotter than the outside temperature.
Cal
I’m kinda excited.
Seems like to avoid “thermal-bridging” through the rafters the best way to utilize my rigid foam that has double sided radiant-barriers is to install them right on the rafters. Know that the air gap created between the roof sheathing (tongue and groove) from the rafters will be just a dead air space.
R-51 on the floor of the attic means 8 inches of rock wool will run perpendicular to the 6 inches of rock wool that fills the joists.
According to the government the wood that comprise the joists and rafters are pretty good heat conductors, and about 25% of your energy costs are lost through this thermal bridging. Know that old homes lack the radiant barriers and insulation that normally by building code is applied to the exterior of the walls, or on top of the roof sheathing where it is easy to make the insulation continuous.
My goal is to make my attic not get like an oven, and pretty much with a continuous radiant barrier my attic should not get hotter than the outside temperature.
Cal