sprintersteve
08-02-2013, 05:45 AM
I have a question about radiant heat barrier and foil back foam boards.
I am installing a roof on an addition to my home, the roof will be from bottom up as follows.
1. 4" x 8" beams
2. 2 x 6 tongue and groove
3. weather guard (heavy duty tar paper due to the low slope)
4. 2 layers of 4.25" polystyrene foam with foil on one side
5. 2 x 4 sleepers
6. foil back osb
7. 30# tar paper
8. 29 gauge metal.
The osb manufacturer recommends to install osb foil down on top of sleepers.
My question is i have foil backing on the insulation, do i face it up towards the foil on the osb, or this going to cause a problem? or do i just ignore the foil on the back of the insulation and use the foil on the osb?From what i have read the foil does nothing without the air gap.
Any help here would be great, thanks!
Totally Confused,
Steve
I am installing a roof on an addition to my home, the roof will be from bottom up as follows.
1. 4" x 8" beams
2. 2 x 6 tongue and groove
3. weather guard (heavy duty tar paper due to the low slope)
4. 2 layers of 4.25" polystyrene foam with foil on one side
5. 2 x 4 sleepers
6. foil back osb
7. 30# tar paper
8. 29 gauge metal.
The osb manufacturer recommends to install osb foil down on top of sleepers.
My question is i have foil backing on the insulation, do i face it up towards the foil on the osb, or this going to cause a problem? or do i just ignore the foil on the back of the insulation and use the foil on the osb?From what i have read the foil does nothing without the air gap.
Any help here would be great, thanks!
Totally Confused,
Steve